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True-rms Digital Multimeters
Users Manual
June 2007, Rev. 2, 3/09
© 2007, 2008 Fluke Corporation. All rights reserved. Specifications subject to change without notice.
All product names are trademarks of their respective companies.
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    287/289True-rms Digital MultimetersUsers ManualJune 2007, Rev. 2, 3/09 2007, 2008 Fluke Corporation. All rights reserved. Specifications subject to change without notice.All product names are trademarks of their respective companies.
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    Lifetime Limited WarrantyEach Fluke 20, 70, 80, 170, 180 and 280 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein,lifetime is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years fromthe date of purchase. This warranty does not cover fuses, disposable batteries, damage from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures caused by use outside of the products specifications, or normal wearand tear of mechanical components. This warranty covers the original purchaser only and is not transferable.For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCDfor a fee based on then current component acquisition costs.To establish original ownership and prove date of purchase, please complete and return the registration card accompanying the product, orregister your product on http://www.fluke.com. Fluke will, at its option, repair at no charge, replace or refund the purchase price of a defectiveproduct purchased through a Fluke authorized sales outlet and at the applicable international price. Fluke reserves the right to charge forimportation costs of repair/replacement parts if the product purchased in one country is sent for repair elsewhere.If the product is defective, contact your nearest Fluke authorized service center to obtain return authorization information, then send theproduct to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no riskfor damage in transit. Fluke will pay return transportation for product repaired or replaced in-warranty. Before making any non-warrantyrepair, Fluke will estimate cost and obtain authorization, then invoice you for repair and return transportation.THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE, AREEXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOTAUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON FLUKES BEHALF. Since some states do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to you. If any provision of thiswarranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validityor enforceability of any other provision.Fluke CorporationP.O. Box 9090Everett, WA 98206-9090U.S.A.5/07Fluke Europe B.V.P.O. Box 11865602 BD EindhovenThe Netherlands
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    Table of ContentsTitleLifetime Limited Warranty...............................................................................................Introduction ....................................................................................................................Contacting Fluke ............................................................................................................Safety Information ..........................................................................................................Hazardous Voltage.........................................................................................................Symbols .........................................................................................................................Features .........................................................................................................................Understanding the Push Buttons ...............................................................................Using Auto Repeat ....................................................................................................Understanding the Display ........................................................................................Bar Graph .............................................................................................................Status Bar Elements .............................................................................................Page Area.............................................................................................................Softkey Labels ......................................................................................................Adjusting Display Contrast....................................................................................Understanding the Rotary Switch ..............................................................................Using the Input Terminals..........................................................................................Controlling Meter Power.................................................................................................iPageii11134556788999101112
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    287/289Users ManualPowering the Meter On and Off Manually .................................................................Battery Level Indicator ..............................................................................................Automatic Power-Off .................................................................................................Battery Saver Mode ..................................................................................................Controlling the Backlight ...........................................................................................Selecting the Range ......................................................................................................Understanding Function Menus .....................................................................................Input Alert Feature......................................................................................................Using the Info Button .....................................................................................................Hold and AutoHold Mode...............................................................................................Measuring Crest Factor .................................................................................................Capturing Minimum and Maximum Values ....................................................................Capturing Peak Values ..................................................................................................Low Pass Filter (Model 289 only)...................................................................................Making Relative Measurements.....................................................................................Making Measurements...................................................................................................Measuring AC Voltage ..............................................................................................Using LoZ for Voltage Measurements (Model 289 only) ...........................................Making dB Measurements ........................................................................................Measuring DC Voltage ..............................................................................................Measuring AC and DC Signals .................................................................................Measuring Temperature............................................................................................Using the Y Function (Model 289 Only) ...............................................................Testing for Continuity ................................................................................................Using Conductance for High Resistance Tests.........................................................Measuring Capacitance ............................................................................................Testing Diodes ..........................................................................................................Measuring Current ....................................................................................................ii12121212131313151515161618202122222323252628313134353638
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    Contents (continued)Measuring Frequency................................................................................................Measuring Duty cycle ................................................................................................Measuring Pulse Width..............................................................................................Changing Meter Setup Options ......................................................................................Resetting Meter Setup Options..................................................................................Setting Display Contrast ............................................................................................Setting the Meters Language....................................................................................Setting Date and Time...............................................................................................Setting Backlight and Auto Off Timeouts ...................................................................Setting a Custom dBm Reference .............................................................................Disabling and Enabling the Beeper ...........................................................................Enabling and Disabling the Smoothing Mode ............................................................Using Other Setup Options........................................................................................Using Memory ................................................................................................................Storing Individual Measurement Data........................................................................Naming Saved Data ..................................................................................................Viewing Memory Data ...............................................................................................Viewing Snapshot and Summary Data .................................................................Viewing Trend Data ..............................................................................................Zooming in on Trend Data ....................................................................................Deleting Stored Measurement Data ..........................................................................Recording Measurement Data .......................................................................................Setting up a Recording Session ................................................................................Setting the Event Threshold Value ............................................................................Starting a Recording Session ....................................................................................Stopping a Recording Session ..................................................................................Using Communications ..................................................................................................Error Messages ..............................................................................................................iii42434547474747484848484949494949505050515152535454545556
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    287/289Users ManualMaintenance ..................................................................................................................General Maintenance................................................................................................Testing the Fuses......................................................................................................Replacing the Batteries .............................................................................................Replacing the Fuses .................................................................................................Test Lead Storage.....................................................................................................In Case of Difficulty ........................................................................................................Service and Parts ..........................................................................................................General Specifications ...................................................................................................Detailed Specifications...................................................................................................AC Voltage Specifications.........................................................................................AC Current Specifications .........................................................................................DC Voltage Specification ..........................................................................................DC Current Specifications.........................................................................................Resistance Specifications .........................................................................................Temperature Specifications ......................................................................................Capacitance and Diode Test Specifications..............................................................Frequency Counter Specifications ............................................................................Frequency Counter Sensitivity ..................................................................................MIN MAX, Recording, and Peak Specifications ........................................................Input Characteristics .................................................................................................Burden Voltage (A, mA, A)......................................................................................iv57575759595961626667686970717272737475767778
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    List of TablesTableTitlePage1.2.3.4.5.6.7.8.9.10.11.12.Symbols.................................................................................................................................Push Buttons .........................................................................................................................Display Features ...................................................................................................................Rotary Switch Positions.........................................................................................................Input Terminals......................................................................................................................Battery Level Indicator...........................................................................................................Trend Data Display................................................................................................................Recording Display .................................................................................................................Stopped Recording Display ...................................................................................................Error Messages .....................................................................................................................Replacement Parts ................................................................................................................Accessories ...........................................................................................................................457101112515355566265v
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    287/289Users Manualvi
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    List of FiguresFigureTitlePage1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.Push Buttons .........................................................................................................................Display Features ...................................................................................................................Rotary Switch ........................................................................................................................Input Terminals......................................................................................................................Function Menu.......................................................................................................................MIN MAX Record Display......................................................................................................Peak Record Display .............................................................................................................Low Pass Filter ......................................................................................................................Relative Mode Functions .......................................................................................................AC Voltage Measurements....................................................................................................dBm Display ..........................................................................................................................DC Voltage Measurements ...................................................................................................AC and DC Display................................................................................................................Temperature Measurement ...................................................................................................Resistance Measurement......................................................................................................Continuity Indicator................................................................................................................Continuity Testing..................................................................................................................57101114171820212223252628303132vii
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    287/289Users Manual18.19.20.21.22.23.24.25.26.27.28.29.30.31.Conductance Measurement ..................................................................................................Capacitance Measurement ...................................................................................................Diode Testing........................................................................................................................Current Measurement Setup.................................................................................................Current Measurement Circuit Connection .............................................................................Functions Allowing Frequency Measurement .......................................................................Frequency Display ................................................................................................................Duty Cycle Measurements ....................................................................................................Duty Cycle Display ................................................................................................................Pulse Width Measurements ..................................................................................................Testing the Current Fuses.....................................................................................................Test Lead Storage ................................................................................................................Replacing Batteries and Fuses .............................................................................................Replaceable Parts.................................................................................................................viii3435374041424344454658596064
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    Safety InformationIntroductionXWWarningRead Safety Information before using this Meter.The descriptions and instructions in this manual apply to themodel 289 and model 287 True-rms Digital Multimeters(hereafter referred to as the Meter). The model 289 appears in allillustrations.Contacting FlukeTo contact Fluke, call:USA: 1-888-993-5853Canada : 1-800-363-5853Europe : +31 402-675-200Japan: +81-3-3434-0181Singapore : +65-738-5655Anywhere in the world: +1-425-446-5500The Meter complies with:ANSI/ISA 82.02.01 (61010-1) 2004UL 61010B (2003)CAN/CSA-C22.2 No. 61010-1-04IEC/EN 61010-1 2 Edition Pollution Degree 2EMC EN 61326-1Measurement Category III, 1000V, Pollution Degree 2Measurement Category IV, 600 V, Pollution Degree 2ndIn this manual, a Warning identifies hazardous conditions andactions that could cause bodily harm or death. A Cautionidentifies conditions and actions that could damage the Meter,the equipment under test, or cause permanent loss of data.XWWarningVisit Fluke's web site at: www.fluke.comRegister your Meter at: http://register.fluke.comTo view, print, or download the latest manual supplement, visithttp://us.fluke.com/usen/support/manuals.To avoid possible electric shock or personalinjury, follow these guidelines:Use this Meter only as specified in thismanual or the protection provided by theMeter might be impaired.Do not use the Meter if it is damaged. Beforeyou use the Meter, inspect the case. Look forcracks or missing plastic. Pay particularattention to the insulation surrounding theconnectors.1
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    287/289Users Manual2Make sure the battery door is closed andlatched before operating the Meter.Remove test leads from the Meter beforeopening the battery door.Inspect the test leads for damaged insulationor exposed metal. Check the test leads forcontinuity. Replace damaged test leads beforeyou use the Meter.Do not apply more than the rated voltage, asmarked on the Meter, between the terminals orbetween any terminal and earth ground.Never operate the Meter with the coverremoved or the case open.Use caution when working with voltages above30 V ac rms, 42 V ac peak, or 60 V dc. Thesevoltages pose a shock hazard.Use only the replacement fuses specified bythe manual.Use the proper terminals, function, and rangefor measurements.Avoid working alone.When measuring current, turn off circuit powerbefore connecting the Meter in the circuit.Remember to place the Meter in series with thecircuit.When making electrical connections, connectthe common test lead before connecting thelive test lead; when disconnecting, disconnectthe live test lead before disconnecting thecommon test lead.Do not use the Meter if it operates abnormally.Protection may be impaired. When in doubt,have the Meter serviced.Do not operate the Meter around explosivegas, vapor, or dust.Use only 1.5 V AA batteries, properly installedin the Meter case, to power the Meter.When servicing the Meter, use only specifiedreplacement parts.When using probes, keep fingers behind thefinger guards on the probes.Do not use the Low Pass Filter option to verifythe presence of hazardous voltages. Voltagesgreater than what is indicated may be present.First, make a voltage measurement without thefilter to detect the possible presence ofhazardous voltage. Then select the filterfunction.Only use test leads that have the same voltage,category, and amperage ratings as the meterand that have been approved by a safetyagency.
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    True-rms Digital MultimetersHazardous VoltageUse proper protective equipment, as requiredby local or national authorities when workingin hazardous areas.Do not remove batteries while the Meter isturned on or a signal is applied to the Metersinput jacks.Comply with local and national safetyrequirements when working in hazardouslocations.Before measuring current, check the Meter'sfuses. (See "Testing the Fuses" in the UsersManual on the accompanying CD.)Do not use the LoZ mode to measure voltagesin circuits that could be damaged by thismodes low impedance (3 k). (Model 289only)WCautionTo avoid possible damage to the Meter or to theequipment under test, follow these guidelines:Disconnect circuit power and discharge allhigh-voltage capacitors before testingresistance, continuity, diodes, or capacitance.Use the proper terminals, function, and rangefor all measurements.Hazardous VoltageTo alert you to the presence of a potentially hazardous voltage,when the Meter detects a voltage 30 V or a voltage overload(OL), the Ysymbol is displayed.3
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    287/289Users ManualSymbolsTable 1 lists and describes the symbols used on the Meter and in this manual.Table 1. SymbolsSymbolSymbolDescriptionBAC (Alternating Current or Voltage)IFuseFDC (Direct Current or Voltage)TWJDouble InsulatedImportant Information; refer to manual$Conforms to relevant Canadian and USstandardsXHazardous voltageEBattery (Low battery when shown on thedisplay)RContinuity test or continuity beeper tonePConforms to European Union directivesUnderwriters Laboratory listed productCAT III~4Description;N10140Earth groundConforms to relevant Australian standardsInspected and licensed by TV ProductServicesIEC Measurement Category III CAT IIIIEC Measurement Category IV CAT IVequipment is designed to protect againstequipment is designed to protect againsttransients in equipment in fixed equipmentCAT IVtransients from the primary supply level,installations, such as distribution panels,such as an electricity meter or an overheadfeeders and short branch circuits, andor underground utility service.lighting systems in large buildings.Do not dispose of this product as unsorted municipal waste. Go to Flukes website for recyclinginformation.
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    True-rms Digital MultimetersFeaturesTable 2. Push ButtonsFeaturesButtonTables 2 through 5 briefly describe the Meters features.Understanding the Push ButtonsOThe 14 push buttons on the front of the Meter activate featuresthat augment the function selected using the rotary switch,navigate menus or control power to Meter circuits. The buttonsshown in Figure 1 are described in Table 2.est02.emf1234FunctionTurns the Meter on or off.Selects sub-functions and modes relatedto the rotary switch function.Cursor buttons select an item in a menu,adjust display contrast, scroll throughinformation, and perform data entry.HFreezes the present reading in thedisplay and allows the display to besaved. Also accesses AutoHold.RSwitches the Meter range mode tomanual and then cycles through allranges. To return to autoranging, pressthe button for 1 second.MStarts and stops MIN MAX recording.IDisplays information about the presentfunction or items on the display at themoment the info button is pressed.GSwitches the display backlight betweenoff, low, and high.Figure 1. Push Buttons5
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    287/289Users ManualUsing Auto RepeatFor some menu selections, holding down a softkey or cursorbutton will continuously change (or advance) a selection until thebutton is released. Normally, each press of a button causes theselection to change once. During some selections, the selectionswill change faster if the button is held for two or more seconds.This is helpful when scrolling through a list of selections, such asa list of stored measurements.6
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    True-rms Digital MultimetersFeaturesTable 3. Display FeaturesUnderstanding the DisplayDisplay features shown in Figure 2 are described in Table 3 andthe following sections.761011123.45 VAC8:10pmREL50100200300AutoHOLDSave14mVACCrest Factor5 mVDCAuto Range500 VAC60.000 Hz21516Setup1est01.epsFigure 2. Display FeaturesASoftkey labelsIndicates the function of the buttonjust below the displayed label.BBar graphAnalog display of the input signal(See the Bar Graph section formore information).CRelativeIndicates the displayed value isrelative to a reference value.DMinus signIndicates a negative reading.ELightning boltIndicates hazardous voltage presentat the Meters input.FRemotecommunicationIndicates activity over thecommunication link.GBattery levelIndicates the charge level of the sixAA batteries.HTimeIndicates the time set in the internalclock.IModeannunciatorsIndicates the Meters mode.13AutoSAVE400Function1206/13/07HOLD123.454398ItemIndication7
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    287/289Users ManualTable 3. Display Features (cont.)ItemFunctionJMinimeasurementDisplays the lightning bolt (whennecessary) and the input valuewhen the primary and secondarydisplays are covered by a menu orpop-up message.KDateIndicates the date set in the internalclock.LBeeperIndicates the Meters beeper isenabled (not associated with thecontinuity beeper).MUnitsIndicates the units of measure.NAuxiliary UnitsIndicates unitless measurementslike Crest Factor.ORange indicatorIndicates the range the Meter is inand the ranging mode (auto ormanual).PIndicationSecondary display Displays secondary measurementinformation about the input signal.Bar GraphThe analog bar graph functions like the needle on an analogmeter, but without the overshoot. The bar graph updates 30times per second. Because the graph updates faster than thedigital display, it is useful for making peak and null adjustmentsand observing rapidly changing inputs. For frequency, duty cycle,pulse width, dBm, and crest factor functions, the bar graphrepresents the amplitude of the input signal (volts or amps) andnot the value in the primary display. The bar graph is not shownfor capacitance, temperature, LoZ, AC+DC, AC over DC, peak,or min max functions.For dc voltage, dc current, and all relative percent modes, azero-centered bar graph is displayed. For dc voltage and current,the bar graph range is the maximum of the selected range. Forrelative percent mode, the bar graph goes to 10 %.The number of lit segments indicates the measured value and isrelative to the full-scale value of the selected range. In the 50Vac range, for example, the major divisions on the scalerepresent 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 Vac. Aninput of 25 Vac turns on segments up to the middle of the scale.For off-scale values, f appears to the right of the normal bargraph. For the zero-center bar graph, a e appears at the left endof the bar graph for negative off-scale values and fappears onthe right end for positive off-scale values.Status Bar ElementsThe status bar at the top of the Meters display containsindicators for battery level, time of day, mini-measurementdisplay, present date, and beeper on/off icon.8
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    True-rms Digital MultimetersFeaturesThe mini-measurement display shows the measurement value ofthe primary function, if it is not already shown in the page area ofthe display. For example, when the display is frozen for a HOLD,the mini-measurement display continues to show the input signal(Live) measurement and a mini z. In addition, the minimeasurement display will flash, if z (for inputs above 30 volts)would normally appear in the primary display but is obscured. Towarn of the possibility of blowing a current fuse, the minimeasurement display also flashes when current measurementsexceed the maximum continuous current levels (seespecifications).Page AreaThe page area of the display is where the main meter content isdisplayed. The primary display (upper half of the page area) iswhere the most important value of the selected function isshown. The secondary display contains the bar graph and valuesthat may be measured in addition to the primary function value.For example, with frequency measurement selected in Vac, thefrequency value will appear in the primary display with the acvoltage value in the secondary display.Softkey LabelsLabels for the four function softkeys (F1 through F4) appear inthe bottom row of the display. These labels will change based onthe function and/or menu selection.Adjusting Display ContrastWhen not selecting items on a menu or inputting data, pressing7 increases display contrast and pressing 8 decreases it.9
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    287/289Users ManualTable 4. Rotary Switch PositionsUnderstanding the Rotary SwitchSelect a primary measurement function by positioning the rotaryswitch to one of the icons around its perimeter. For eachfunction, the Meter presents a standard display for that function(range, measurement units, and modifiers). Button choices madein one function do not carry over into another function. Themodel 289 offers two additional functions: low ohms (Y) andlow impedance (LoZ) ac volts. Each position shown in Figure 3 isdescribed in Table 4.SwitchPositionLAC voltage measurementsTAC millivolt measurementsDC and ac+dc voltage measurementsNDC millivolts, ac+dc millivolt, andtemperature measurementsSResistance, continuity, and conductancemeasurementsPDiode test and capacitance measurementsAAC, dc and ac+dc amps and milliampsmeasurementsXAC, dc and ac+dc microamperemeasurements up to 5,000 AYResistance measurements with 50e range(model 289 only)Figure 3. Rotary Switch10AC voltage measurement using a low inputimpedance (model 289 only)VUest03.emfFunction
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    True-rms Digital MultimetersFeaturesTable 5. Input TerminalsUsing the Input TerminalsAll functions except current use the W and COM inputterminals. The two current input terminals (A and mA/A) areused as follows:TerminalACurrent from 0 to 400 mA, use the and COM terminals.Current between 0 and 10 A use the A and COM terminals.COMDescriptionInput for 0 A to 10.00 A current (20VAoverload for 30 seconds on, 10 minutes off),frequency, and duty-cycle measurements.Input for 0 A to 400 mA currentmeasurements, frequency, and duty cycle.Return terminal for all measurements.Input for voltage, continuity, resistance,diode test, conductance, capacitance,frequency, temperature, period, and dutycycle measurements.est04.emfFigure 4. Input Terminals11
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    287/289Users ManualTable 6. Battery Level IndicatorControlling Meter PowerThe Meter is powered by six AA batteries and controlled througha front panel power switch and internal circuits designed to helpconserve battery power. The following sections describe severaltechniques for controlling Meter power.Powering the Meter On and Off ManuallyWith the Meter off, press O to turn on the Meter. Pressing Owhile the Meter is on causes it to turn off.NoteCollected data is retained when the Meter is turned offwhile in record, MIN MAX record, or Peak recordmodes. When the Meter is next turned on, the dispayshows the collected data in stopped mode. Pressingthe softkey labeled Save will save the data.IndicationBattery CapacityBFull capacityC capacityD capacityE capacity[1]FAlmost empty (less than one day)[1] When critically low, a Replace batteries pop-up messageappears 15 seconds before the Meter shuts down.The Meter will display a Batteries low message whenever thebattery level will not support a selected function.Battery Level IndicatorAutomatic Power-OffThe battery level indicator in the upper left-hand corner of thedisplay indicates the relative condition of the batteries. Table 6describes the various battery levels the indicator represents.The Meter automatically turns off if the rotary switch is not movedor a button is not pressed for 15 minutes (default). Pressing Owill turn the Meter back on after it is powered off automatically.To change the timeout period or completely disable automaticpower-off, refer to Setting Backlight and Auto Off Timeouts laterin this manual.Battery Saver ModeIf Auto off is enabled (set to a time period), and MIN MAX record,Peak record, Recording, or AutoHold is enabled, the Meter willenter a battery-saver mode if a push-button is not pressed or therotary switch is not moved for a set period of time. For the12
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    True-rms Digital MultimetersSelecting the Rangerecording mode, the time period is five minutes. For MIN MAX,Peak and AutoHold modes, the time period is the same time theAuto Off feature is set for. See the Setting Backlight and AutoOff Timeouts section later in this manual. Battery saver modeconserves battery power by shutting down circuits not necessaryfor the selected function, including the display. However, the LEDsurrounding the power button (O) will continue to flash toindicate the Meter is still collecting data.The Meter wakes up from battery-save mode under thefollowing conditions:A button is pressedThe rotary knob is movedA lead is removed or inserted into a current input jack.The Meter changes rangeIR Communications beginSelecting the RangeThe Meters selected range is always displayed above the righthand end of the bar graph, as the range indicator. Pressing Rswitches the Meter between manual and autoranging. It alsocycles through the Meter ranges when manual ranging isenabled.NoteYou cannot use R in conductance, diode test, LoZ,Low Ohms, and temperature functions. Thesefunctions all use a fixed range.In autorange, the Meter selects the lowest range to display thehighest available precision (resolution) for the input signal. IfManual range is already enabled, press and hold R for onesecond to enter the autoranging mode.These condictions only awaken the Meter and does not changethe Meters function or mode of operation.If autorange is enabled, press R to enter manual ranging.Each additional press of R sets the Meter to the next higherrange, unless it is already in the highest range, at which point therange switches to the lowest range.Controlling the BacklightUnderstanding Function MenusIf viewing the display becomes difficult in low-light conditions,press G to activate the LCD backlight. The backlight buttoncycles the backlight through three states: low, high, and off. TheMeter displays a message if the battery level will not support thebacklight operation.Each primary measurement function (rotary switch position) hasa number of optional sub-functions or modes accessed bypressing the softkey labeled Menu (F1). A typical menu is shownin Figure 5.To conserve battery life, a user-adjustable timeout controls howlong the backlight stays on. The default timeout is 5 minutes. Tochange the timeout, refer to Setting Backlight and Auto OffTimeouts later in this manual.13
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    287/289Users ManualIn most cases, the softkeys revealed by the menu selection actlike toggles. The example menu shown in Figure 5 shows REL,REL%, and Close softkeys. In this example, the Meter is not inthe relative mode, so pressing the softkey labeled REL wouldactivate, or toggle, the relative mode. If, on the other hand theMeter is already in the relative mode, pressing the same softkeywould disable the relative function.MenuVACRELPeak, CFRELHz, %, mSdBmdBVREL%Closeest05.epsFigure 5. Function MenuMenu selection is indicated by the filled-in black square(hereafter the menu selector) to the left of a menu item. Use thefour front-panel cursor buttons (5 6 7 8) to position the menuselector next to a menu item. As the menu selector movesbetween menu items, the four softkeys and their labels change toreflect the available functions and/or modes available for theselection menu item.The example menu in Figure 5 shows the REL (Relative)function as the current selection. The function selected when themenu opens is the function selected the last time the menu wasused. To get to the Hz menu item from the REL item, press 6once, followed by one press of 7. As the menu selector movesbetween the menu items, the softkey labels change to indicateeach softkeys function. Once the desired function or modeappears in one of the softkey labels, press the appropriatesoftkey to activate it. The pop-up menu closes and the displaychanges to reflect the selection just made. Pressing the softkeylabeled Close closes the pop-up menu, leaving the Meter in thestate it was in before pressing the Menu softkey.14In some cases, pressing a function that can not be used withother functions appearing in the menu turns off the previouslyselected function. For example, in Figure 5, if the Meter isalready in the relative function, pressing REL% causes the Meterto turn off relative and display relative percent.In cases where multiple modes have been selected, selecting thefirst (top-left) menu item always turns off all other functions andmodes, and returns the Meter to the primary function selected bythe rotary switch. For example, assume that the Meter is setupfor frequency (Hz) and is displaying in relative mode as selectedthrough the menu in Figure 5. Moving the menu selector to themenu item labeled VAC and pressing the softkey labeled VAC,clears both frequency and relative selections, leaving the Meterin volts ac only.Menu selections are remembered for each rotary switch position.For example, selecting REL for the volts ac position causes RELto be selected the next time the menu is opened in volts ac, eventhough in the interim, Hz,%,ms was selected from a similar menufor the millivolts ac function.Up to two columns of four items each are displayed at any onetime. If more than eight menu items are available for a primaryfunction, g appears in the lower right-hand corner of the pagearea of the display, indicating more menu items are available.With the menu selector on one of the items in the left column,
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    True-rms Digital MultimetersInput Alert Featurepress 5 to scroll the screen horizontally and reveal the off-screenmenu items. Conversely, with the menu selector on an item inthe right-hand column, press 6 to reveal the off-screen menuitems.The information revealed through I is not meant to replacethe more detailed information found in this manual. Function andfeature explanations are brief and only meant to refresh apersons memory.Input Alert FeatureThe number of information topics displayed at any one time mayexceed the display area. Use the softkeys labeled Next and Prevto move from topic to topic. Use the softkey labeled More or 7and 8 to scroll through the information a full screen at a time.XW WarningTo avoid circuit damage and possibly blowing theMeters current fuse, do not place the probesacross (in parallel with) a powered circuit when alead is plugged into a current terminal. Thiscauses a short circuit because the resistancethrough the Meter's current terminals is very low.If a test lead is plugged into the mA/A or A terminal, but therotary switch is not set to the correct current position, the beeperwarns you by making a chirping sound and displays Leadsconnected incorrectly. This warning is intended to stop you fromattempting to measure voltage, continuity, resistance,capacitance, or diode values when the leads are plugged into acurrent terminal.Using the Info ButtonWhile operating the Meter, more information about a selectedfunction, a front-panel button, or a menu item may be necessary.Press I to open an information window that lists topicscovering the functions and modifiers that are available at the timethe button is pressed. Each topic provides a brief explanation ona Meter function or feature.Pressing the softkey labeled Close, or I will close theinformation window.Hold and AutoHold ModeTo freeze the display for any function, press H. Only the minimeasurement display and hazardous voltage icon (z) continue toindicate the actual input. The battery level indicator is also active.The Meters softkeys are relabeled for saving the frozen readingor activating the AutoHold mode.If H is pressed while MIN MAX record, peak record, or arecording session is in progress, the display freezes but the dataacquisition continues in the background. Pressing H againupdates the display to reflect data that was acquired during thehold.Pressing the softkey labeled AutoHOLD activates AutoHold ifthe Meter is not in the Peak, MIN MAX, or Record modes.AutoHold operation monitors the input signal and updates thedisplay and, if enabled, sounds the beeper, whenever a newstable measurement is detected. A stable measurement is onethat does not vary more than a selected adjustable percentage(AutoHold threshold) for at least one second. The Meter filters15
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    287/289Users Manualout open lead conditions so the Meter leads can be movedbetween test points without triggering a display update.NoteFor temperature measurements, the AutoHoldthreshold is a percent of 100 degrees. The defaultAutoHold threshold is 4% of 100 degrees, or 4 degreesCelsius or Fahrenheit.Pressing H while in AutoHold mode, forces the Metersdisplay to update with the present measurement, just as if astable measurement had been detected.To set the AutoHOLD Threshold Value, press the softkey labeledSetup to access the setup menu. Using the cursor buttons, movethe menu selector next to the menu item labeled Recording andpress the softkey labeled Recording to open the recording setupscreen. Using the cursor buttons, move the menu selector nextto the menu item labeled Event Threshold for AutoHOLD andthen press the softkey labeled Edit. Press 7 or 8 to scrollthrough the AutoHold threshold values. With the desired valueselected, press the softkey labeled Close.Measuring Crest FactorCrest factor is a measure of signal distortion and is calculated asa signals peak value over its rms value. This is an importantmeasurement when looking at power quality issues.The Meters crest factor function is only available for the acmeasurements: Vac, mVac, Aac, mAac, and Aac. With theMeter in one of the ac measurement functions, press the softkeylabeled Menu. Next, move the menu selector next to the menuitem labeled Peak,CF and press the softkey labeled CF. The16crest factor value is displayed in the primary display while the acmeasurement appears in the secondary display. Frequency, dutycycle, and pulse width are not allowed during crest factormeasurements.Capturing Minimum and MaximumValuesThe MIN MAX Record mode captures minimum, average, andmaximum input values. When the input goes below the recordedminimum value or above the recorded maximum value, the Meterbeeps and records the new value. The Meter stores the elapsedtime since the recording session was started at the same time.The MIN MAX mode also calculates an average of all readingstaken since the MIN MAX mode was activated.This mode is for capturing intermittent readings, recordingminimum and maximum readings unattended, or recordingreadings while equipment operation precludes watching theMeter. The MIN MAX mode is best for recording power supplysurges, inrush currents, and finding intermittent failures.Response time is the length of time an input must stay at a newvalue to be captured as a possible new minimum or maximumvalue. The Meter has a 100 millisecond MIN MAX response time.For example, a surge lasting 100 milliseconds would be capturedbut one lasting only 50 milliseconds may not be captured at itsactual peak value. See the MIN MAX specification for moreinformation.The true average value displayed is the arithmetic mean of allreadings taken since the start of recording (overloads arediscarded). The average reading is useful for smoothing outunstable inputs, calculating power consumption, or estimatingthe percentage of time a circuit is active.
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    True-rms Digital MultimetersCapturing Minimum and Maximum ValuesNoteFor input signals that are noisy or change rapidly, turnon the Smoothing mode to display a steadier reading.See the Enabling and Disabling the Smoothing Modesection later in this manual.To extend battery life during MIN MAX recording, the Meter willenter a battery saver mode. See the Setting Backlight and AutoOff Timeouts section for more information on the battery savermode.To activate the MIN MAX mode, press M. As shown inFigure 6, the Meter displays e at the top of themeasurement page, and the MIN MAX start date and time alongthe bottom of the page. In addition, the recorded maximum,average, and minimum values appear in the secondary displaywith their respective elapsed times.8:10pm06/07/07Min Max119.81 VACMaximumAverageMinimum127.09119.50110.23VACAuto Range500 VAC00:03:17VAC01:10:09VAC00:59:59Start : 06/07/07 7:00 pmRestartStopest42.epsFigure 6. MIN MAX Record DisplayTo stop a MIN MAX recording session, press M or the softkeylabeled Stop. The summary information in the display freezes,and the softkeys change function to allow saving the collecteddata. Pressing M again or the softkey labeled Close exits theMIN MAX record session without saving the collected data.NoteTurning the rotary switch before saving the MIN MAXrecording data will cause all the accumulated data tobe lost.To save the MIN MAX screen data, the MIN MAX session mustbe ended by pressing the softkey labeled Stop. Next, press thesoftkey labeled Save. A dialog box opens where the defaultsaved name can be selected or another name assigned. Press17
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    287/289Users Manualthe softkey labeled Save to store the MIN MAX screen data. MINMAX can not be continued at this point. Press the softkey labeledClose to exit the MIN MAX mode.Pressing the softkey labeled Restart while MIN MAX is runningstops the MIN MAX session, discards all MIN MAX data, andimmediately starts a new MIN MAX recording session.Capturing Peak ValuesPeak record is almost the same as MIN MAX record explainedearlier in this manual. The significant difference between the tworecording functions is the shorter response time for peakrecording: 250 s. With this short response time, the actual peakvalues of a sinusoidal signal are measurable. Transients aremore accurately measured using the peak record feature.To activate the peak mode, press the softkey labeled Menu.Move the menu selector next to the menu item labeled Peak,CFor Peak. Press the softkey labeled Peak to start the peakrecording session.8:10pm06/07/07Peak119.8168.2Average118.9Peak Min -173.9Peak MaxVVACAuto Range500 VAC00:03:17VAC01:10:59V01:10:09Start : 06/07/07 7:00 pmRestartStopest43.epsFigure 7. Peak Record DisplayAs shown in Figure 7, the primary display shows the livemeasurement present on the Meters inputs. In the secondaryarea of the display, the maximum and minimum peak values aswell as the average value are shown along with their respectivetime stamps. The time stamp next to the average value indicatesthe elapsed time of the peak recording session. The peakrecording session start time is shown along the bottom of thepage area of the display.When the peak value of the input signal goes below the recordedminimum value or above the recorded maximum value, the Meterbeeps and records the new value. At the same time, the elapsedtime since the peak recording session was started is stored asthe recorded values time stamp.18
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    True-rms Digital MultimetersCapturing Peak ValuesPressing the softkey labeled Stop ends the peak recordingsession. The summary information in the display freezes and thesoftkeys change function to allow saving the collected data.Pressing the softkey labeled Close exits the peak recordingsession without saving the collected data.NoteTurning the rotary switch before saving the peakrecording data will cause all the accumulated data tobe lost.To save peak screen data, the peak capture session must beended by pressing the softkey labeled Stop. Next press thesoftkey labeled Save. A dialog box opens where the defaultsaved name can be selected or another name assigned. Pressthe softkey labeled Save to store the Peak screen data. Peakcapture can not be continued at this point. Press the softkeylabeled Close to exit the Peak capture mode.Pressing the softkey labeled Restart while the peak recordingsession is running stops the session, discards all peak recordeddata, and immediately starts a new peak record session.When viewing saved records, snapshot peak records look thesame as a stopped peak records. Therefore, use the elapsedtime (average value time stamp) to identify one record fromanother.To extend battery life during peak record, the Meter enters abattery-saver mode after a period of time set for the Auto Offfeature. See the Setting Backlight and Auto Off Timeoutssection for more information on the battery saver mode.19
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    287/289Users ManualLow Pass Filter (Model 289 only)The Meter is equipped with an ac low pass filter. Whenmeasuring ac voltage, or Vac frequency, press the softkeylabeled Menu to open the function menu, and move the menuselector to the l item. Next, press the softkey labeledl to toggle the low pass filter mode on (l displayed)and off.XWWarningTo avoid possible electric shock or personalinjury, do not use the Low Pass Filter option toverify the presence of hazardous voltages.Voltages greater than what is indicated may bepresent. First, make a voltage measurementwithout the filter to detect the possible presence ofhazardous voltage. Then select the filter function.The Meter continues measuring in the chosen ac mode, but nowthe signal passes through a filter that blocks unwanted voltagesabove 1 kHz, as shown in Figure 8. The low pass filter canimprove measurement performance on composite sinewaves that are typically generated by inverters and variablefrequency motor drives.NoteIn Low Pass Mode, the Meter goes to manual mode.Select ranges by pressing R. Autoranging is notavailable when the Low Pass Filter is enabled.201 kHz100 Hzaom11f.epsFigure 8. Low Pass Filter
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    True-rms Digital MultimetersMaking Relative MeasurementsMaking Relative MeasurementsThe Meter displays calculated values that are based on a storedvalue when set to relative and relative percent mode. Figure 9shows the functions for which the two relative modes areavailable. In addition, the two relative modes are available infrequency, duty cycle, pulse width, crest factor, and dB.secondary display. The present or Live measurement moves tothe secondary display and the primary display indicates thedifference between the present measurement and the referencevalue in measurement units for REL and as a percentage forREL %.When relative percent is enabled, the bar graph is a zerocentered bar graph that indicates the percentage difference. Thebar graphs range is limited to 10 %, but the display goes to999.9 %. At 1000 % or more, the display indicates OL. Whenthe reference value is 0, the Meter displays OL.With the exception of dB measurements, ranging is set tomanual and can not be changed. Both auto and manual rangingis possible when making relative dB measurements.When relative is enabled during dBm or dBV measurements, thedisplayed units change to dB.In relative or relative percent mode, the softkey label for F3indicates REL or REL%, depending on which of the two modesis not presently selected. The F3 button acts as a toggle,switching the Meter between the two modes. Moving the rotaryswitch between V and mV while in relative dBm or dBv modedoes not disable the dB measurement. This allows continuousmeasurements over a wide range of input voltage.est29.epsFigure 9. Relative Mode FunctionsTo activate the relative or relative percent modes while in one ofthe functions shown in Figure 9, press the softkey labeled Menu.Move the menu selector to the menu item labeled REL. Next,press either the softkey labeled REL or REL%. Themeasurement value at the time that either Rel or Rel % isenabled, is stored as the reference value and displayed in the21
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    287/289Users ManualMaking MeasurementsThe following sections describe how to take measurements withthe Meter.Measuring AC VoltageThe Meter displays ac voltage measurements as rms (root meansquare) readings. The rms value is the equivalent dc voltage thatwould produce the same amount of heat in a resistance as themeasured voltage. True-rms readings are accurate for sinewaves and other wave forms (with no dc offset) such as squarewaves, triangle waves, and staircase waves. For ac with dcoffset, refer to the Measuring AC and DC Signals section laterin this manual.08:10pm03 / 13/ 06123.451000Menu200Save300400VACAuto Range500 VACSetupSwitchBoxRotate the Meters rotary switch to V or T and set up the Meterto measure ac volts as shown in Figure 10.The Meters ac volts function offers a number of modes toprovide more details about an ac signal. Pressing the softkeylabeled Menu opens a menu of items that can be used to modifythe basic ac voltage measurement. Refer to the appropriatesection in this manual to learn more about each menu item.To clear all modes and return to the basic volts ac measurement,press the softkey labeled Menu. Move the menu selector to theitem labeled VAC. Press the softkey labeled VAC to clear allfunctions and modes.est07.epsFigure 10. AC Voltage Measurements22
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    True-rms Digital MultimetersMaking Measurements8:10pmUsing LoZ for Voltage Measurements (Model289 only)W CautionDo not use the LoZ mode to measure voltages incircuits that could be damaged by this modes lowimpedance (3 k).In LoZ, both R and M are disabled. There are no additionalmodes for this function and the softkey labeled Menu is thereforedisabled as well.Making dB MeasurementsThe Meter is capable of displaying voltage as a dB value, eitherrelative to 1 milliwatt (dBm), a reference voltage of 1 volt (dBV)or a user-selectable reference value. See the Setting a CustomdBm Reference section later in this manual.dBm41.830100To eliminate ghost voltages, the Meters LoZ function presents alow impedance across the leads to obtain a more accuratemeasurement.To make a LoZ measurement, set the rotary switch to L. TheMeter displays the ac voltage in the primary display and the dcvoltage in the secondary display. During LoZ measurements, theMeters range is set to 1000 volts in the manual ranging mode.06/13/07200300400Auto Range500 VAC123.45 VAC1000MenuSaveReferenceRefSetupest08.epsFigure 11. dBm DisplayTo set the Meter to display values in dBm, set the rotary switchto V or T and press the softkey labeled Menu. Move the menuselector to the menu item labeled dBm. Press the softkeylabeled dBm. The dBm, Hz menu selection replaces thesecondary display (123.45 VAC in Figure 11) with the frequencymeasurement. All voltage measurements are displayed as adBm value, as shown in Figure 11.A dBm measurement must use a reference impedance(resistance) to calculate a dB value based on 1 milliwatt. Whenset to 600 (default), the reference impedance is not displayedduring a dBm measurement. When set to something other than600 , the reference impedance is displayed just above thesoftkey labels.23
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    287/289Users ManualTo select another reference value, press the softkey labeled Refto display a message box with the current reference value.Pressing 7 or 8, scrolls through the nine predefined references:4, 8, 16, 25, 32, 50, 75, 600, and 1000. Set the reference bypressing the softkey labeled OK. To add a custom referenceimpedance, see the Setting a Custom dBm Reference sectionlater in this manual.A dBV measurement uses a 1 volt reference voltage to comparethe present measurement against. The difference between thetwo ac signals is displayed as a dBV value. The referenceimpedance setting is not part of a dBV measurement.To make a dBV measurement, position the rotary switch to V orT and place the Meter leads on the voltage to be measured.Next, press the softkey labeled Menu. Move the menu selectorto the menu item labeled dBV and press the softkey labeleddBV. The Meter displays the voltage in dBV.To exit the dBV or dBm function, press the softkey labeled Menufollowed by the softkey labeled dBV or dBm, respectively.Selecting one of the other modifiers such as ms, %, or CF alsocancels dBV or dBm.24
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    True-rms Digital MultimetersMaking MeasurementsMeasuring DC VoltageThe Meter displays dc volts values as well as their polarity. Thebar graph for dc voltage measurements is a zero-centered bargraph. Positive dc voltages cause the bar graph to fill to the rightof center while negative dc voltages fill left of center.To measure a dc voltage with the Meter, rotate the rotary switchto the U or N position as shown in Figure 12.The Meters dc volts function offers a number of modes toprovide more details about a dc signal. Pressing the softkeylabeled Menu opens a menu of items that can be used to modifythe basic dc voltage measurement. Refer to the appropriatesection in this manual to learn more about each menu item.8:10pm06/13/079.752 VDC-50-40 -30 -20 -10MenuSave0102030Auto Range40 50 VDCSetupVTo clear all modes and return to the basic volts dc measurement,press the softkey labeled Menu. Move the menu selector to theitem labeled VDC. Press the softkey labeled VDC to clear allfunctions and modes.est09.epsFigure 12. DC Voltage Measurements25
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    287/289Users Manualindicate AC+DC (F1), AC,DC (F2), and DC,AC (F3). Press thesoftkey that presents these two signals as needed.Measuring AC and DC SignalsThe Meter is capable of displaying both ac and dc signalcomponents (voltage or current) as two separate readings or oneAC+DC (rms) value combined. As shown in Figure 13, the Meterdisplays ac and dc combinations three ways: ac displayed overdc (AC,DC), dc displayed over ac (DC,AC), and ac combinedwith dc (AC+DC). Select one of these three displays using theFunction and Mode menu.While in any of the three AC+DC modes, peak measurements,frequency, duty cycle, and period measurements are notallowed. In addition to these modes, MIN MAX, relative, andrelative % are not allowed in AC,DC or DC,AC modes.NoteThe bar graph is not displayed while the Meter is inany of the three AC+DC modes.With the rotary switch set to U, N, A, or X, press thesoftkey labeled Menu. Move the menu selector to the menu itemlabeled AC+DC. At this point, three different softkey labelsAC over DC8:10pmDC over AC06/13/078:10pmAC + DC06/13/07123.45 VAC23.45 VDC23.45 VDC123.45 VACAuto Range500 VACMenuSaveSetupAuto Range500 VMenuSaveSetup8:10pm06/13/07125.66 VAC + DCAuto Range500 V23.45 VDCMenuSaveSetupest30.epsFigure 13. AC and DC DisplayBoth manual and autoranging is available when using the ac+dcmodes. The same range is used for both ac and dc signals.26However, while in autorange, up-ranging occurs when either theac or dc signal exceeds the present range. Down-ranging occurs
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    True-rms Digital MultimetersMaking Measurementsonly when both the ac and dc signals drop below 10% of thepresent range. For AC+DC, ranging is controlled by theunderlying values of the ac and dc signals and not by the sum ofthe AC+DC calculation.To exit the AC+DC mode, press the softkey labeled Menu andselect the default mode for the selected function. For dc voltsand dc millivolts functions, move the menu selector to VDC andpress the softkey labeled VDC. For the current functions, movethe menu selector to the AC,DC menu item and press either theAC or DC softkey.27
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    287/289Users ManualMeasuring TemperatureXW Warning8:10pm06/13/0726.5To avoid the potential for fire or electric shock, donot connect the thermocouple to electrically livecircuits.C+8.0 OffsetMenuSaveOffsetSetupThe Meter uses an 80BK-A Integrated DMM Temperature Probeor other type-K temperature probe for measuring temperature.To measure temperature, set up the Meter as shown inFigure 14. Press the softkey labeled Menu and move the menuselector to the menu item labeled Temp. Press the softkeylabeled F for temperature in Fahrenheit or C for Celsius.NoteA Meter classified as SI will not have an F selection.The primary display normally shows temperature or the messageOpen Thermocouple. The open thermocouple message may bedue to a broken (open) probe or because no probe is installedinto the input jacks of the Meter. Shorting the W terminal tothe COM terminal will display the temperature at the Meterterminals.NoteR is disabled when the Meter is in the Temperaturefunction.80BK Type KThermocoupleProbeVentorPipeest17.epsFigure 14. Temperature Measurement28
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    True-rms Digital MultimetersMaking MeasurementsTo input a temperature offset value, press the softkey labeledOffset to open a message box with the present offset value. Use6 and 5 to position the cursor over one of the digits or the polaritysign. Use 7 and 8 to scroll through the numbers for each digitin the offset or switch between a + or offset. With the desiredvalue displayed, press the softkey labeled OK to set thetemperature offset. When set to something other than 0.0, theoffset value is shown in the secondary display.Measuring ResistanceW CautionTo avoid possible damage to the meter or to theequipment under test, disconnect circuit powerand discharge all high-voltage capacitors beforemeasuring resistance.The Meter measures resistance (opposition to current flow) inohms (). This is accomplished by sending a small current outthrough the test leads to the circuit under test.Keep the following in mind when measuring resistance.Because the meters test current flows through all possible pathsbetween the probe tips, the measured value of a resistor in acircuit is often different from the resistors rated value.The test leads can add 0.1 to 0.2 of error to resistancemeasurements. To test the leads, touch the probe tips togetherand read the resistance of the leads. To remove lead resistancefrom the measurement, hold the test lead tips together and pressthe softkey labeled Menu. Next, move the menu selector to themenu item labeled REL and press the softkey labeled REL. Nowall future displayed readings indicate the resistance at the probetips.The Meters resistance function includes modes to help withresistance measurements. Pressing the softkey labeled Menuopens a menu of items that can be used to modify the basicresistance measurement. Refer to the appropriate section in thismanual to learn more about each menu item.To measure resistance, set the Meters rotary switch to S andset up the Meter as shown in Figure 15.29
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    287/289Users ManualIn-Circuit Resistance Measurements8:10pm06/13/075.670100200300400Isolating a PotentiometerCircuit PowerOFFAuto Range5001MenuSave3 2SetupDisconnect213Isolating a ResistorDisconnectest11.epsFigure 15. Resistance Measurement30
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    True-rms Digital MultimetersMaking MeasurementsUsing the Y Function (Model 289 Only)W CautionTo avoid damaging the circuit under test, be awarethe Meter sources current up to 10 mA at an opencircuit voltage up to 20 volts.To measure low resistances with the Meter, position the rotaryswitch to Y. This function has a single range and R istherefore disabled when the Meter is in the Y function.measurement response of the Meter will not appear in the digitaldisplay. Therefore, the continuity function uses a graphicalindicator for the presence or absence of continuity. Figure 16shows the short and open continuity indication.ShortOpenOnly the relative and relative percent functions work with theY function. Press the softkey labeled Menu to access thesetwo functions.Testing for Continuityest36.epsFigure 16. Continuity IndicatorW CautionTo avoid possible damage to the meter or to theequipment under test, disconnect circuit powerand discharge all high-voltage capacitors beforetesting continuity.Continuity is the presence of a complete path for current flow.The continuity function detects intermittent opens and shortslasting as short as 1 ms. The Meter uses three indicators for theabsence and presence of continuity: a resistance reading, anopen/short indicator, and a beeper.To perform a continuity test, position the rotary switch to S andset up the Meter as shown in Figure 17. Press the softkeylabeled j. In continuity, a short means a measured value lessthan 8 % of full scale for the 500 range and less that 4 % forother resistance ranges.NoteThe Meter operates in manual range only while thecontinuity function is selected.The resistance reading is simply an ohms function measurement.However, for continuity transitions that are very short, the slow31
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    287/289Users ManualFor in-circuit tests, turn circuit power off.Beep on short8:10pm1008:10pm06/13/075.670Beep on open20030040006/13/07OLContinuity5000100200Beep on SHORTMenuSave300Continuity400500Beep on OPENSetupMenuSaveSetupON(closed)OFF(open)ON(closed)OFF(open)est13.epsFigure 17. Continuity Testing32
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    True-rms Digital MultimetersMaking MeasurementsTo change whether the beeper sounds on shorts or opens, pressthe softkey labeled Menu. Move the menu selector to the menuitem labeled Beeper and press the softkey labeled Short/O.This beeper selection, Beep on Short or Beep on Open, isdisplayed just above the continuity indicator. The continuitybeeper is always enabled when continuity mode if first entered.To enable or disable the beeper for continuity, press the softkeylabeled Menu. Move the menu selector to the menu item labeledBeeper and press the softkey labeled Beeper. The status of thecontinuity beeper is displayed to the right of the resistancereading with j when enabled and i when disabled. This settingis independent of the Meters beeper enable/disable setting inthe setup menu.Toggle between the continuity and ohms functions by pressingsoftkey F3, which is always labeled with the alternate function.33
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    287/289Users ManualUsing Conductance for High Resistance TestsConductance, the inverse of resistance, is the ability of a circuitto pass current. High values of conductance correspond to lowvalues of resistance.The unit of conductance is the Siemens (S). The meters 50 nSrange measures conductance in nanosiemens (1 nS =0.000000001 Siemens). Because such small amounts ofconductance correspond to extremely high resistance, the nSrange is used to measure the resistance of components up to100,000 M, or 100,000,000,000 (1 nS = 1,000 M).8:10pm06/13/0726.55010Menu20Save3040nSManual Range50 nSSetupTo measure conductance, position the rotary switch to S andset up the Meter as shown in Figure 18. Move the menu selectorto the menu item labeled Ohms,nS,j and press the softkeylabeled nS.There is normally a residual conductance reading with the testleads open. To ensure accurate readings, press the softkeylabeled Menu. Move the menu selector to the menu item labeledREL and press the softkey labeled REL to subtract the residualvalue with the test leads open.NoteR is disabled when the Meter is measuringconductance.est14.epsFigure 18. Conductance Measurement34
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    True-rms Digital MultimetersMaking MeasurementsMeasuring CapacitanceW CautionTo avoid possible damage to the meter or to theequipment under test, disconnect circuit powerand discharge all high-voltage capacitors beforemeasuring capacitance. Use the dc voltagefunction to confirm that the capacitor isdischarged.8:10pm06/13/0726.52MenuSaveAuto Range100 uFSetupCapacitance is the ability of a component to store an electricalcharge. The unit of capacitance is the farad (F). Most capacitorsare in the nanofarad (nF) to microfarad (F) range.The Meter measures capacitance by charging the capacitor witha known current for a known period of time, measuring theresulting voltage, and then calculating the capacitance.+++++++++est15.epsFigure 19. Capacitance Measurement35
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    287/289Users ManualTo measure capacitance, position the rotary switch to P and setup the Meter as shown in Figure 19. If the display doesntalready indicate the Meter is measuring capacitance, press thesoftkey labeled Menu. Next, move the menu selector to themenu item labeled Diode,Cap and press the softkey labeledCap.NoteTo improve measurement accuracy of small valuecapacitors, press Menu and move the menu selectorto the menu item labeled REL. With the test leadsopen, press the softkey labeled REL to subtract theresidual capacitance of the Meter and leads.Testing DiodesW CautionTo avoid possible damage to the meter or to theequipment under test, disconnect circuit powerand discharge all high-voltage capacitors beforetesting diodes.Use the diode test to check diodes, transistors, silicon controlledrectifiers (SCRs), and other semiconductor devices. The test36sends a current through a semiconductor junction, and thenmeasures the junctions voltage drop. A typical junction drops0.5 V to 0.8 V.To test a diode out of a circuit, position the rotary switch to Pand set up the meter as shown in Figure 20. If the displaydoesnt already indicate the Meter is in the Diode Test function,press the softkey labeled Menu. Next, move the menu selectorto the menu item labeled Diode,Cap and press the softkeylabeled Diode.If the beeper is enabled during diode test, it will beep briefly for anormal junction and sound continuously for a shorted junction,below 0.1 V. See the Disabling and Enabling the Beepersection to disable the beeper.In a circuit, a similar diode should still indicate a forward-biasreading of 0.5 V to 0.8 V; however, the reading can varydepending on the resistance of other pathways between theprobe tips.NoteR and MIN MAX are disabled when the Meter issetup for diode test.
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    True-rms Digital MultimetersMaking MeasurementsTypicalReading8:10pm.567018:10pm06/13/07234VDC06/13/07VDCOLManual Range5 VDC01234Manual Range5 VDCReverse BiasMenuSaveSetupMenuSaveSetup+Forward Bias+est16.epsFigure 20. Diode Testing37
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    287/289Users Manual2.Measuring CurrentXW WarningTo avoid damage to the Meter and possible injury,never attempt an in-circuit current measurementwhere the open-circuit potential to earth is greaterthan 1000 V.NoteTo avoid blowing the Meters 440 mA fuse, use themA/A terminal only if you are sure the current is lessthan 400 mA.3.If you are using the A terminal, set the rotary switch to A.If you are using the mA/A terminal, set the rotary switch toX for currents below 5000 A (5 mA), or A forcurrents above 5000 A. See Figure 21 for test leadconnections and function selection. Refer to the Input AlertFeature section for information on the alerts the Meter useswhen leads are not used correctly for currentmeasurements.4.As shown in Figure 22, open the circuit path to be tested.Touch the red probe to the more positive side of the break;touch the black probe to the more negative side of thebreak. Reversing the leads will produce a negative reading,but will not damage the meter.5.Turn on power to the circuit; then read the display. Be sureto note the measurement unit given at the right side of thedisplay (A, mA, or A).6.Turn off power to the circuit and discharge all high-voltagecapacitors. Remove the Meter and restore the circuit tonormal operation.W CautionTo avoid possible damage to the Meter or to theequipment under test, check the meters fusesbefore measuring current. See the Maintenancesection later in this manual. Use the properterminals, function, and range for yourmeasurement. Never place the probes across (inparallel with) any circuit or component when theleads are plugged into the current terminals.Current is the flow of electrons through a conductor. To measurecurrent, you must open the circuit under test, then place themeter in series with the circuit.NoteWhen measuring current, the display will flash whenthe input current exceeds 10 amps for the A terminaland 400 mA for the mA/A terminal. This is a warningthat current is approaching the fuses current limit.To measure ac or dc current, proceed as follows:1.38Turn off power to the circuit. Discharge all high- voltagecapacitors.Insert the black lead into the COM terminal. Insert the redlead in an input appropriate for the measurement range.
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    True-rms Digital MultimetersMaking MeasurementsNoteWhile in a current measurement function, the Meterwill stay in the selected AC or DC currentmeasurement mode when switching between n and. Whenever switched to one of the currentmeasurement functions, the Meter will default to thelast current type selected (AC or DC).39
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    287/289Users Manual8:10pm2.552701Menu8:10pm06/13/072Save34AAC19.783Auto Range5 AACSetup01Menu8:10pm06/13/072Save34mAAC4.863Auto Range5 AACSetup06/13/0701Menu2Save34uAACAuto Range5 AACSetupest18.epsFigure 21. Current Measurement Setup40
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    True-rms Digital MultimetersMaking Measurements8:10pm06/13/07mAACTotal current to circuitCircuit Power:OFF to connect meter.ON for measurement.OFF to disconnect meter.Current through one componentest19.epsFigure 22. Current Measurement Circuit Connection41
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    287/289Users ManualW CautionFigure 23 highlights the functions that allow frequencymeasurements.Placing the probes across (in parallel with) apowered circuit when a lead is plugged into acurrent terminal can damage the circuit you aretesting and blow the Meter's fuse. This can happenbecause the resistance through the Meter's currentterminals is very low, so the Meter acts like a shortcircuit.The following are tips for current measurements:A current meter drops a small voltage across itself, which mightaffect circuit operation. You can calculate this burden voltageusing the values listed in the specifications under Burden Voltage(A, mA, A).The Meters current functions have a number of modes whichprovide more details about a current signal. Pressing the softkeylabeled Menu opens a menu of items that can be used to modifythe basic current measurement. Refer to the appropriate sectionin this manual to learn more about each menu item.To clear all modes and return to the basic ac or dc currentmeasurement, press the softkey labeled Menu. Move the menuselector to the item labeled AC,DC. Press the softkey labeled ACto clear all functions and modes and make basic ac currentmeasurements, or DC for basic dc current measurements.Measuring FrequencyFrequency is the number of cycles a signal completes eachsecond. The meter measures the frequency of a voltage orcurrent signal by counting the number of times the signal crossesa threshold level within a specified period of time.42est21.epsFigure 23. Functions Allowing FrequencyMeasurementThe Meter autoranges to one of five frequency ranges:99.999 Hz, 999.99 Hz, 9.9999 kHz, 99.999 kHz, and 999.99 kHz.Figure 24 shows a typical frequency display. Pressing Rcontrols the input range of the primary function (volts or amps)and not the frequency range.To measure frequency, rotate the switch to one of the primaryfunctions allowing frequency measurements highlighted inFigure 23. Press the softkey labeled Menu and move the menu
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    True-rms Digital MultimetersMaking Measurementsselector to the menu item labeled Hz,%,ms. Next press thesoftkey labeled Hz.8:10pmSelection between a rising trigger c or falling trigger dedge isperformed by pressing the softkey labeled c d. This softkeytoggles the trigger setting between the two selections.06/13/07The following are tips for frequency measurements:If a reading shows as 0 Hz or is unstable, the input signal may bebelow or near the trigger level. You can usually correct theseproblems by manually selecting a lower input range, whichincreases the sensitivity of the meter.60.050Hz0100200300400If a reading seems to be a multiple of what you expect, the inputsignal may be distorted. Distortion can cause multiple triggeringsof the frequency counter. Selecting a higher voltage range mightsolve this problem by decreasing the sensitivity of the meter. Ingeneral, the lowest frequency displayed is the correct one.Auto Range500 VAC123.45 VACMeasuring Duty cycleMenuSaveSetupest22.epsFigure 24. Frequency DisplayAs shown in Figure 24, the frequency of the input signal isdisplayed in the primary display. The volts or amps value of thesignal is shown in the secondary display. The bar graph does notindicate frequency but indicates the volts or amps value of theinput signal.Duty cycle (or duty factor) is the percentage of time a signal isabove or below a trigger level during one cycle, as shown inFigure 25.The duty-cycle mode is optimized for measuring the on or offtime of logic and switching signals. Systems such as electronicfuel injection systems and switching power supplies arecontrolled by pulses of varying width, which can be checked bymeasuring duty cycle.43
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    287/289Users ManualMeasures Positive PulseTrigger Level30% AboveTriggerLevel100%Measures Negative PulseTrigger Level70% BelowTrigger Level100%est28.epsFigure 25. Duty Cycle Measurements44
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    True-rms Digital MultimetersMaking MeasurementsTo measure duty cycle, position the rotary switch on one of thefunctions allowing frequency measurements shown in Figure 23.Press the softkey labeled Menu and move the menu selector tothe menu item labeled Hz,%,ms. Next press the softkey labeled%.8:10pm06/13/07123.45 VAC49.750100200300400SaveThe pulse polarity is displayed to the right of the duty cycle value.J indicates a positive pulse and K indicates a negative pulse.To change the polarity being measured, press the softkeylabeled J K. The polarity indicator changes to the oppositepolarity.For 5 V logic signals, use the 5 V dc range. For 12 V switchingsignals in automobiles, use the 50 V dc range. For sine waves,use the lowest ac or dc range that does not result in multipletriggering. A manually-selected lower input range will oftenmeasure better than the AUTO-selected input range.%Duty CycleAuto Range500 VACMeasuring Pulse Width59.756 HzMenuvolts or amps value of the input signal. The bar graph tracks thevolts or amps value of the signal and not the duty cycle value.The pulse width function measures the amount of time a signal ishigh or low, as shown in Figure 27. The measured waveformmust be periodic; its pattern must repeat at equal time intervals.The meter measures pulse width from 0.025 ms to 1250.0 msranges.Setupest24.epsFigure 26. Duty Cycle DisplayAs shown in Figure 26, the duty cycle percentage is shown in theprimary display while the signal frequency appears in thesecondary display. The mini-measurement display indicates theTo measure pulse width, position the rotary switch to one of thefunctions allowing frequency measurements shown in Figure 23.Press the softkey labeled Menu and move the menu selector tothe menu item labeled Hz,%,ms. Next, press the softkey labeledms.45
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    287/289Users ManualMeasure Positive Pulse WidthTrigger LevelPulseWidth1Period = FrequencyMeasure Negative Pulse WidthTrigger LevelPulse WidthPeriodest27.epsFigure 27. Pulse Width Measurements46
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    True-rms Digital MultimetersChanging Meter Setup OptionsThe primary display indicates the input signals pulse width inmilliseconds. The frequency of the signal is displayed in thesecondary display. The mini-measurement display indicates thevolts or amps value of the input signal. The bar graph tracks thevolts or amps value of the signal and not the pulse width value.The pulse width polarity is displayed to the right of the duty cyclevalue. J indicates a positive pulse width and K indicates anegative pulse. To change the polarity, press the softkey labeledJ K. The polarity indicator changes to the opposite polarity.Changing Meter Setup OptionsThe Meter has a number of preset features such as date andtime formats, backlight and battery save mode timeouts, and thedisplayed language. These variables are referred to as Metersetup options. Many setup options affect general Meteroperations and are active in all functions. Others are limited toone function or group of functions.Access to the setup options is always available through thesoftkey labeled Setup. Information about the Meter, such asserial number, model, for example. is also accessed through thesetup menu.Resetting Meter Setup OptionsThe Meters setup options can be reset to default values throughthe setup menu. Open the setup menu by pressing the softkeylabeled Setup. Position the menu selector next to the menu itemlabeled Reset and press the softkey labeled Setup. A messagewill appear asking to confirm the reset action. Press the softkeylabeled OK to perform the reset.NoteA setup reset also resets the temperature offset anddBm reference to their default value.In addition to resetting the setup variables, pressing the softkeylabeled Meter will also clear all saved measurement screens,MIN MAX screens, peak screens, and recording records. TheMeters clock is reset to a default value as well.Setting Display ContrastMeter display contrast can be adjusted through the Meters setupmenu. Open the setup menu by pressing the softkey labeledSetup and position the menu selector next to the menu itemlabeled Contrast. Pressing the softkey labeled + (F1) increasesdisplay contrast, while the softkey labeled (F2) decreasescontrast.Contrast can also be set through the 7 and 8 buttons when notbeing used to move between menu selections.Setting the Meters LanguageThe Meter comes from the factory with the display language setto English. To select another language, open the setup menu bypressing the softkey labeled Setup. Move the menu selector nextto the menu item labeled Display. Next, press the softkeylabeled Format (F2) to open the format menu. If not alreadyselected, move the menu selector to the left of the menu itemlabeled Language and press the softkey labeled Edit. Thecurrently selected language becomes highlighted and f appearsto the right of the language. Use 7 and 8 to scroll through theavailable languages, then press the softkey labeled OK to set theMeters display language. Press the softkey labeled Close toreturn to normal Meter operation.47
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    287/289Users ManualSetting Date and TimeThe Meters internal clock is used in the display and for timestamping recorded measurements. To change the date and timeas well as the display format, press the softkey labeled Setup.Position the menu selector next to the menu item labeledDisplay. To set the date and time, press the softkey labeledDate/Time to open the date/time menu. Next, position the menuselector next to either the Set Date item or Set Time item andpress the softkey labeled Edit. Using 5 and 6, position the cursoron the date or time element to adjust. Use 7 and 8 to changethe selected date or time element value. Press OK to completethe action.Setting Backlight and Auto Off TimeoutsThe Meters backlight and auto off features use timers todetermine when to turn off the backlight, when to automaticallyturn the Meter off or enable the battery saver mode. To set thesetimeouts, press the softkey labeled Setup and position the menuselector next to the menu item labeled Instrument. Position themenu selector next to the menu item labeled Auto BacklightTimeout or Auto Power Off and then press the softkey labeledEdit. Use 7 and 8 to adjust the time to one of the presetvalues. Press OFF to disable the timeout feature. Press thesoftkey labeled OK to set the selected time. Press the softkeylabeled Close to return to normal Meter operation.The battery-saver mode is used when the Meter is performing arecording session or during MIN MAX, Peak record andAutoHold. The battery-saver mode powers down circuits that arenot involved in the operation of these recording sessions,including the display. For the record mode, the timeout period isset to five minutes and is enabled only when the Auto Power Off48timeout is set to a value other than Off. For MIN MAX, Peak, andAutoHold, the timeout is the time period set for Auto Off.Setting a Custom dBm ReferenceTo add a custom dBm reference value, press the softkey labeledSetup and position the menu selector next to the menu itemlabeled Instrument. Next press the softkey labeled Instrumentand position the menu selector next to the menu item labeleddBm Reference. Next, press the softkey labeled Edit. Use 5 and6 to position the cursor on a specific digit. Press 7 and 8 toincrement or decrement the digit. With the desired referencedisplayed, press the softkey labeled OK to add this value to thedBm reference list. Only one custom value is allowed. Press thesoftkey labeled Close to return to normal Meter operation.Disabling and Enabling the BeeperThe Meters beeper alerts users to the presence of messages,operator errors such as incorrect lead connections for theselected function, and newly sensed values for MIN MAX andPeak recording. Although the beeper is also used for thecontinuity function, controlling the beeper for that function is notdone through this setup option. See the Testing for Continuitysection for information on the continuity beeper.To enable or disable the Meters beeper, press the softkeylabeled Setup and position the menu selector next to the menuitem labeled Instrument. Next press the softkey labeledInstrument and position the menu selector next to the menuitem labeled Beeper. Press the softkey labeled Edit to move thecursor to the on or off selection. Use 7 and 8 to switch thebeeper on or off. The status of the beeper is indicated in thedisplays status bar (see item 12 in Figure 2).
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    True-rms Digital MultimetersUsing MemoryEnabling and Disabling the Smoothing ModeUsing MemoryWhen an AC input signal is noisy or changes rapidly, thesmoothing mode may display a steadier reading. To enable ordisable the smoothing mode, press the softkey labeled Setupand position the menu selector next to the menu labeledInstrument. Next press the softkey labeled Instrument andposition the menu selector next to the menu item labeledSmoothing. Press the softkey labeled Edit to move the cursor tothe on or off selection. Use 7 and 8 to switch the smoothingmode on or off.The Meter has memory for storing individual measurements,measurements collected over a specified duration, andmeasurement events.Using Other Setup OptionsStoring Individual Measurement DataAdditional setup options hold information about the Meter as wellas some general Meter functions. The Meter Info selection liststhe serial number, model number, firmware version, calibrationdate, and calibration counter. Operator name, company name,site name, and contact information are also displayed when thisinformation has been loaded into the Meter from FlukeViewForms software.For all measurement functions, a snapshot of the screen data issaved by pressing the softkey labeled Save. Except for the minimeasurement in the status bar, the display freezes and the Savemenu appears. Two choices allow either saving the data under apreviously selected name or choosing another name by pressingthe softkey labeled +Name. See the Naming Saved Datasection later in this manual. The displayed data is stored alongwith the date and time of day the save was performed.The Calibration selection allows a qualified calibrationtechnician to enter a password that allows the Meter to becalibrated. See the 287/289 Calibration Information document tocalibrate the Meter.The Secure Erase option allows user-accessible memory to beerased as required by Homeland Security regulations. Metercalibration is not lost when this low-level erase is performed.As new Meter features are created, the latest version of softwarecan be downloaded to the Meter from Flukes support web pageusing the Software Update option.All stored data can be viewed on the Meter or downloaded to aPC through the Meters infrared (IR) communication link usingFlukeView Forms. See the Using Communications section formore information on communicating with a PC throughFlukeView Forms software.For MIN MAX and Peak, the displayed summary data can bestored at any time by pressing the softkey labeled Save, thuspreserving a snapshot of the session at that moment.Naming Saved DataThe Meter has a list of eight preset names under whichmeasurement data is saved. Multiple records can be saved usingthe same name. For example, one preset name is Save. The firsttime a save operation is performed with that name, Save-1 isused to name the record in memory. The next time the Savename is used, the number increments to 2 and the record is49
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    287/289Users Manualsaved under the name of Save-2. The auto-incrementing numbercan be reset to 1 by positioning the menu selector next to thesave name and then pressing the softkey labeled Reset #.To save a screen shot, a recording session, or MIN MAX or Peakrecord session, press the softkey labeled Save. To select thename from the preset list, press +Name. To save to the samename as before but with the next number, press the softkeylabeled Save. This second method makes it easy to save aseries of measurements simply by pressing the Save softkeytwice for each save operation.When selecting the name for a save operation, position the menuselector next to the desired name using the cursor buttons. Nextpress the softkey labeled Save.Viewing Memory DataViewing data stored in the Meters memory is performed throughthe save menu. Press the softkey labeled Save. Position themenu selector next to the menu item labeled View Memory andpress the softkey labeled View.NoteTo view data stored in memory, the Meter must not berecording or performing a MIN MAX or peak recordsession.The Meter separates stored data into four different categories:Measurement, MIN MAX, Peak, and Recording. Use the cursorbuttons to position the menu selector next to the desired saveddata category and then press the softkey labeled View. TheMeter displays the last record saved for the selected datacategory.50If there are previously stored records, press the softkey labeledPrev or 5 to page back through previously stored records. Pressthe softkey labeled Next or 6 to page in the other direction. PressClose to return to normal Meter operation.Viewing Snapshot and Summary DataAfter selecting the MIN MAX, Peak, or Measurement categorydescribed in the Viewing Memory Data section above, pressingView only displays the information stored at the time a Save wasperformed. The display is reconstructed from this data whenviewed.Viewing Trend DataFor the Recording category, the interval and event data storedduring a recording session are viewed on the Meter through atrend-plot view, similar to a strip-chart recorder. See theRecording Measurement Data section later in this manual foran explanation of interval and event data.After selecting the recording category described in the ViewingMemory Data section above and pressing View, the recordingsessions summary screen is displayed (See Table 9). Press thesoftkey labeled Trend to display the recorded data in a trend-plotview. Table 7 shows the trend view along with a description ofeach of its components.To look at data stored in the individual records that make up thetrend, move the cursor to any point along the plot by pressing 6or 5. The value and timestamp of the minimum, maximum, andend-of-record values of the selected record are displayed at thebottom of the cursor. All data contained in a record can only beviewed on a PC running FlukeView Forms.
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    True-rms Digital MultimetersUsing MemoryNoteX-axis time labels are shown in elapsed time while thetimestamp shown under the cursor is an absolute timeTable 7. Trend Data Display32101/16/08 09:43:17am30100:300:45HH:MM1:001:1523.456 VAC 08:13:05 6/28/0756est35.epsDescriptionACursorBStart date and timeCTrend lineDZoom level.Time scale legend (HH:MM or MM:SS)GMeasured value and timestamp of selectedrecord.Deleting Stored Measurement Data1:307ItemFWhile viewing trend data, pressing 7 or 8 zooms in or outrespectively on the data around the cursor. Each press of 7reduces the x-axis time period by one half to reveal more details.Each press of 8 doubles the time period until all the recordeddata is displayed. The zoom level is displayed in the upper-righthand corner of the display. X1 indicates the trend of the completerecording period is displayed. X2 is one-half the recording time.X3 is one-fourth the recoring time. This magnification cancontinue until the x-axis time period is one second.x1VAC200:15Elapsed time. Units in hours and minutes, orminutes and seconds.Zooming in on Trend Data4400EDeleting data stored in the Meters memory is performed throughthe save menu. Press the softkey labeled Save. Use the softkeylabeled Prev and Next to select an item for deletion.The Meter separates stored data into four different categories:Measurement, MIN MAX, Peak, and Recording. Use the cursorbuttons to position the menu selector next to a saved datacategory and then press the softkey labeled View to view theitem.Pressing the softkey labeled Delete All will delete all stored dataunder the selected saved data category. Or press the softkeylabeled View. After accepting a confirmation message, use the51
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    287/289Users Manualsoftkeys labeled Prev and Next to select an item for deletion.Next, press the softkey labeled Delete. A message asking toconfirm the deletion will appear before anything is deleted frommemory.Recording Measurement DataThe Meters record feature collects measurement informationover a user-specified duration. This collection of information iscalled a recording session. A recording session is made up ofone or more measurement records. Each record containsmeasurement summary information covering the duration of therecord.Each record contains the minimum, maximum, and averagevalue detected over the records duration. In addition tomeasurement values, time stamps are also captured and savedwith each record. The time stamps consist of the record starttime, the time the maximum value was detected, the time theminimum value was detected, and the record end time.Some of a records data can be viewed through the MetersViewing Trend Data function. Viewing all the data that makes upa record can only be viewed on a PC running FlukeView Formssoftware.There are two measurement record types that are capturedduring a recording session: interval and event. An interval recordcovers a user-specified interval. An event record has a durationdetermined by the activity of the measured signal and caninterrupt an interval record. Even if an interval record isinterrupted, a record will end and a new interval record will beginwhen the scheduled interval time expires.52Event records are triggered by the measured signal varying morethan an adjustable percentage of the value measured at the startof the record. This adjustable percent is called the EventThreshold for recording. In addition to the values and timestamps mentioned above, an event record also stores whetherthe signal was stable or unstable during the event recordduration. To be classified as stable, the measured signals valuemust stay within the selected percentage of the start value for atleast one second. Measured signals that exceed the percentagethreshold in less than one second are classified as unstable. Seethe Setting the Event Threshold Value section later in thismanual.NoteFor temperature measurements, the AutoHoldthreshold is a percent of 100 degrees. The defaultAutoHold threshold is 4% of 100 degrees, or 4 degreesCelsius or Fahrenheit.A record ends when one of the following occurs:The start of a new interval record.A range overload, causing the Meter to change range.A non-ranging overload, when in manual range or thehighest range.The measured value changes more than 4 % of themeasured value at the start of the record.The recording session terminates.A recording session termination can be caused by one of thefollowing:
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    True-rms Digital MultimetersRecording Measurement DataRecording session duration expiring.Manually stopping the recording session.Table 8. Recording Display8:10pm06/13/07123.45 VACSetting up a Recording SessionBefore starting a recording session, setup the Meter for themeasurements to be recorded. If needed, change the eventthreshold value (see the Setting the Event Threshold Valuesection later in this manual). Press the softkey labeled Save toopen the save menu. Using the cursor buttons, move the menuselector next to the menu item labeled Record and press thesoftkey labeled Record to open the configuration display.There are two variables in setting up a recording session:Recording session duration, and sample interval duration. Bothvariables affect the recording length and number of intervalsrecorded. These two variables may interact, in that setting onevariable may adjust the other variable to fit the recording sessionwithin the available memory. The percentage of memoryavailable at the beginning of a recording session is displayedbelow the duration and sample interval settings. Option valuescan be adjusted as follows:The sample interval can be set from one second to 99 minutesand 59 seconds. Recording session duration can be set from oneminute to 99 days 23 hours 59 minutes.1Recording1.75 VAC065100200300400Auto Range500 VAC2Start Time:06/10/07 07:23:55Remaining Time: 2 Hrs 26 minsInterval Samples: 47Events:7Reference: 121.70 VAC34Stopest31.epsItemDescriptionARecording session in progress icon.BTime and date when recording session started.CTime remaining until recording session stops.DTotal number of event records recorded so far.EReference value for relative measurements.FTotal number of interval records recorded so far.53
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    287/289Users ManualThe Meter allocates memory in such a way as to guaranteecapturing all of the user-specified sample intervals. Eventrecords will also be captured until the Meter detects the allocatedmemory has been used up. At this point, events are notrecorded, but the event counter continues to advance to indicatethe total number of events that occurred. A plus (+) sign appearsafter the event count to indicate this condition.NoteThe maximum number of recorded sample intervals is10,000. The maximum number of recorded events is15,000 minus the number of sample intervals. Thesemaximum numbers are proportionally decreased whenthe available memory is low.To change either of the two recording variables, use the cursorbuttons to position the menu selector next to the desired menuitem and press the softkey labeled Edit. Use 5 6 7 and 8 tomove between and set each digit of the selected variable.If the battery level is anything but full, a message appears at thebottom of the record menu reminding you of the battery levelbefore you start the recording session.Setting the Event Threshold ValuePress the softkey labeled Setup to access the setup menu.Using the cursor buttons, move the menu selector next to themenu item labeled Recording and press the softkey labeledRecording to open the recording setup screen. Using the cursorbuttons, move the menu selector next to the menu item labeledEvent Threshold for Recording and then press the softkeylabeled Edit. Press 7 or 8 to scroll through the event threshold54values. With the desired value selected, press the softkeylabeled Close.Starting a Recording SessionOnce the variables are set, press the softkey labeled Start, atwhich point s appears in the display and the green LEDsurrounding the power button (O) flashes. Table 8 shows therecording display and describes the information displayed.The Menu, Setup, Reference, and Temperature Offset softkeyfunctions are not available while the Meter is recording. Thisensures that measurements within a recording session areconsistent.To extend battery life while recording, the Meter may enter abattery-saver mode five minutes after a push-button is pressedor IR communications activity ends. If the Auto Power-Offtimeout is set to never, the battery-saver mode is disabled.Stopping a Recording SessionThe recording session will continue until the allocated memory isused, the batteries expire, the rotary switch is moved, a probe isinserted or removed from the A or mA/A jacks, or the session isterminated by pressing the softkey labeled Stop.Table 9 shows the display and describes the displayedinformation after stopping a recording session.After stopping a recording session, choose to save the recordingsession, view the trend data (see the Viewing Trend Datasection), or close the recording session. If the session wasntsaved before pressing the Close softkey, the data is lost.
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    True-rms Digital MultimetersUsing CommunicationsTable 9. Stopped Recording DisplayUsing CommunicationsYou can use the IR communication link and FlukeView Formssoftware to transfer the contents of a meters memory to a PC.18:10pm123.45 VACRELStopped1.75065100200300When using a PC-to-meter IR (infrared) communication link, referto the FlukeView Forms Installation Guide or the on-line help.06/13/07RecordingNoteVACAuto Range400500 VAC2Start Time : 06/10/07 07:23:55Duration : 3 days 14 Hrs 47 minsInterval Samples: 135Events:53Reference: 121.70 VACSaveTrend34Closeest34.epsItemDescriptionAStopped Icon indicating the recording session isstopped.BTime and date when the recording began.CLength (duration) of time recording session wasin progress.DNumber of event records detected.EReference value for relative measurements.FNumber of interval records detected.The Meter will log in real-time mode to a connectedcomputer running FlukeView Forms. In addition, theMeter allows the user to log to internal memory andconnect to the computer later for download.FlukeView Forms allows you to place the data into standard(default) or customized forms. The forms display the data in tableand graph form, as well as show user comments. You can usethese forms to satisfy ISO-9000 and other documentationrequirements.55
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    287/289Users ManualError MessagesTable 10 list some of the error messages the Meter may display and the conditions that may be causing the error.Table 10. Error MessagesMessageLeads connected incorrectly.ConditionsLead in A or mA/A jack but rotary switch not in corresponding A/mA or Aposition.Leads in both A and mA/A jacks.Rotary switch set to measure current but no lead in either A or mA/A jack.Open ThermocoupleThermocouple wire is open or thermocouple junction is corroded.No Thermocouple connected to the Meters input.Batteries low functionunavailable.The function selected requires a higher battery level to operate within specifications.Error: Date and Time need to be Batteries were left out too long and the Meters date and time were lost.reset.Not enough memory foroperation.When starting a recording session or saving screen data, the Meter does not haveenough memory to store the information.Batteries critically low, replacenow.Battery is too low to make measurements within stated specifications. The Meter will turnoff within 15 seconds after this message appears to preserve the Meters date and time.56
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    True-rms Digital MultimetersMaintenanceTesting the FusesMaintenanceXWWarningTo avoid electrical shock or personal injury,repairs or servicing not covered in this manualshould be performed only by qualified personnelas described in the 287/289 Service Information.General MaintenancePeriodically wipe the case with a damp cloth and mild detergent.Do not use abrasives, isopropyl alcohol, or solvents.Dirt or moisture in the terminals can affect readings and canfalsely activate the Input Alert feature. Clean the terminals asfollows:1.Turn the Meter off and remove all test leads.2.Shake out any dirt that may be in the terminals.3.Soak a clean swab with mild detergent and water. Work theswab around in each terminal. Dry each terminal usingcanned air to force the water and detergent out of theterminals.As shown in Figure 28, with the Meter in the S function, inserta test lead into the W jack and place the probe tip on theother end of the test lead against the metal of the current inputjack. If the Leads Connected Incorrectly message appears, theprobe tip has been inserted too far into the amps input jack. Backthe lead out a bit until the message disappears and either OL ora resistance reading appears in the Meters display. Theresistance value should be between 0.00 and 0.50 for the Ajack and 10.00 0.05 k for the jack.XWWarningTo avoid electrical shock or personal injury,remove the test leads and any input signals beforereplacing the battery or fuses. To prevent damageor injury, install only Fluke specified replacementfuses with the amperage, voltage, and speedratings shown in Table 11.57
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    287/289Users Manual8:10pm10.000Menu06/13/07kReplace F1 ifreading is OL8:10pm06/13/070.50Replace F2 ifreading is OLMenuest33.epsFigure 28. Testing the Current Fuses58
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    True-rms Digital MultimetersMaintenanceReplacing the BatteriesRefer to Figure 30 and replace the batteries as follows:1.Turn the Meter off and remove the test leads from theterminals.2.Remove the battery door assembly by using a standardblade screwdriver to turn the battery door screw one-halfturn counterclockwise.3.Replace the batteries with 1.5 volt AA batteries (NEDA 15AIEC LR6). Observe proper polarity.4.Reinstall the battery door assembly and secure it by turningthe screw one-half turn clockwise.Test Lead StorageFigure 29 shows the proper method for storing the test leads withthe Meter.Replacing the FusesReferring to Figure 30, examine or replace the Meter's fuses asfollows:1.Turn the Meter off and remove the test leads from theterminals.2.Remove the battery door assembly by using a standardblade screwdriver to turn the battery door screw one-halfturn counterclockwise.3.Remove the fuse by gently prying one end loose, thensliding the fuse out of its bracket.4.Install only Fluke specified replacement fuses with theamperage, voltage, and interrupt ratings shown in Table 11.5.est41.epsFigure 29. Test Lead StorageReinstall the battery door assembly and secure it by turningthe screw one-half turn clockwise.59
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    287/289Users ManualF211 AF10.44 Aest32.epsFigure 30. Replacing Batteries and Fuses60
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    True-rms Digital MultimetersIn Case of DifficultyIn Case of DifficultyIf the Meter does not seem to work properly:1.Check that all batteries are installed with the correctpolarity.2.Examine the case for damage. If damage is detected,contact Fluke. See the Contacting Fluke section earlier inthis manual.3.Check and replace (as needed) the batteries, fuses, andtest leads.4.Review this manual to verify correct operation.5.If the Meter still does not work, pack it securely and forwardit, postage paid, to the location provided by the appropriateFluke contact. Include a description of the problem. Flukeassumes no responsibility for damage in transit.A Meter under warranty will be repaired or replaced (at Flukesoption) and returned at no charge. See the registration card forwarranty terms.61
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    287/289Users ManualService and PartsReplacement parts and accessories are shown in Tables 11 and 12 and Figure 31. To order parts and accessories, refer to the ContactingFluke section.Table 11. Replacement PartsItemQty.Fluke Part/ModelNumber1Knob127984342Skin12798418 (289)2798429 (287)3Keypad125782344O-Ring127401855Case Top125781786Screw, Phillps527437647Mask, LCD12760673 (289)2798407 (287)8LCD Module127348289Shock Absorber3279351610Spring Detent1272377211RSOB Housing, Upper1262DescriptionShield12578283Upper12578252Lower12578265
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    True-rms Digital MultimetersService and PartsTable 11. Replacement Parts (cont.)ItemDescriptionQty.Fluke Part/Model Number13RSOB Housing, Lower1257829014Case Bottom1257818415Shock Absorber, Battery Compartment1279352516Battery Contact, Negative2257837517Battery Contact, Positive1257835318WFuse (F1), 0.440 A, 1000 V, FAST, Interrupt rating 10 kA194312119WFuse (F2), 11 A, 1000 V, FAST, Interrupt rating 20 kA180329320Battery, 1.5 V NEDA 15C/15F or IEC R6S637675621Battery Door Assembly (includes tilt bail)1282447722Screw, Phillips785366823TL71 Right-Angle Test Lead Set1TL7124Alligator Clips, one black and one red21670652 (Black)1670641 (Red)25Manual, Manual Pack, Fluke 287/2891274885112748872[1]26287/289 Users Manual CDWTo ensure safety, use exact replacement only.[1] The Users and Getting Started manuals are available through www.Fluke.com. Click on Support and then Product Manuals.63
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    287/289Users Manual123214316452415182517764 PL1982 PL20910112621226 PL1213est40.epsFigure 31. Replaceable Parts64
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    True-rms Digital MultimetersService and PartsTable 12. AccessoriesItemDescriptionAC72Alligator Clips for use with TL75 test lead setAC220Safety Grip, Wide-Jaw Alligator Clips80BK-A80BK-A Integrated DMM Temperature ProbeTPAKToolPak Magnetic HangerC25Carrying Case, SoftTL764 mm Diameter Test LeadsTL220Industrial Test Lead SetTL224Test Lead Set, Heat-Resistant SiliconeTP1Test Probes, Flat Blade, Slim ReachTP4Test Probes, 4 mm diameter, Slim ReachFluke accessories are available from an authorized Fluke distributor.65
  • Page 76

    287/289Users ManualGeneral SpecificationsMaximum voltage between any Terminal and Earth Ground: 1000 VW Fuse Protection for mA or A inputs .............0.44 A (44/100 A, 440 mA), 1000 V FAST Fuse, Fluke specified part onlyW Fuse Protection for A input.............................11 A, 1000 V FAST Fuse, Fluke specified part onlyBattery Type ..........................................................6 AA Alkaline batteries, NEDA 15A IEC LR6Battery Life ............................................................100 hours minimum. 200 hours in Logging modeTemperatureOperating ............................................................-20 C to 55 CStorage................................................................-40 C to 60 CRelative Humidity ..................................................0 % to 90 % (0 C to 37 C), 0 % to 65 % (37 C to 45 C), 0 % to 45 % (45 C to 55 C)AltitudeOperating ............................................................3,000 mStorage................................................................10,000 mTemperature Coefficient.......................................0.05 X (specified accuracy) /C (<18 C or >28 C)Vibration.................................................................Random Vibration per MIL-PRF-28800F Class 2ndShock .....................................................................1 meter drop per IEC/EN 61010-1 2 EditionSize (HxWxL) .........................................................8.75 in x 4.03 in x 2.38 in (22.2 cm x 10.2 cm x 6.0 cm)Weight ....................................................................28.0 oz (871 g)Safety StandardsUS ANSI..............................................................Complies with ANSI/ISA 82.02.01 (61010-1) 2004CSA.....................................................................CAN/CSA-C22.2 No 61010-1-04 to 1000 V Measurement Category III and 600 VMeasurement Category IV, Pollution Degree 2UL........................................................................UL 61010 (2003)ndCE European.......................................................IEC/EN 61010-1 2 Edition Pollution Degree 266
  • Page 77

    True-rms Digital MultimetersDetailed SpecificationsElectromagnetic Compatibility Standards (EMC)European EMC....................................................EN61326-1Australian EMC ...................................................; N10140US FCC ...............................................................FCC CFR47: Part 15 CLASS ACertifications .........................................................UL, CE, CSA, ; (N10140),Detailed SpecificationsAccuracy:Accuracy is specified for a period of one year after calibration, at 18 C to 28 C (64 F to 82 F), with relative humidity to 90 %. Accuracyspecifications are given as: ( [ % of reading ] + [ number of least significant digits ] ). Accuracy specification assumes ambient temperaturestable at 1 C. For ambient temperature changes of 5 C, rated accuracy applies after 2 hours. To obtain full accuracy in DC mV,Temperature, Ohms and Lo (50) Ohms, let the meter stabilize 20 minutes after using LoZ.True-rms:AC mV, AC V, AC A, AC mA, and AC A specifications are ac-coupled, true rms, and are specified from 2 % of range to 100 % of range,except 10 A range is specified from 10 % to 100 % of range.Crest Factor:Accuracy is specified with AC crest factor 3.0 at full-scale, increasing linearly to 5.0 at half-scale, except the 1000 V range, where it is 1.5at full scale, increasing linearly to 3.0 at half-scale and 500 mV and 5000 A, where it is 3.0 at 80 % of full scale, increasing linearly to 5.0at half-scale. For non-sinusoidal waveforms add (0.3 % of range and 0.1 % of reading).AC Floor:When the input leads are shorted together in the ac functions, the Meter may display a residual reading up to 200 counts. A 200 countresidual reading will cause only a 20 count change for readings at 2 % of range. Using REL to offset this reading may produce a much largerconstant error in later measurements.AC+DC:AC+DC is defined asac 2 + dc 267
  • Page 78

    287/289Users ManualAC Voltage SpecificationsFunctionRange[1]AC mV50 mV500 mV[1]5V[1]50 V[1]500 V1000 V[3]-70 to -62 dB[3]-62 to -52 dB[3]-52 to -6 dB[3]-6 to +34 dB[3]34 to 60 dBAC VdBVLow pass filter0.001 mV0.01 mV0.0001 V0.001 V0.01 V0.1 V0.01 dB0.01 dB0.01 dB0.01 dB0.01 dB20 to 45 Hz45 to 65 Hz1.5 % + 601.5 % + 601.5 % + 601.5 % + 601.5 % + 601.5 % + 603 dB1.5 dB0.2 dB0.2 dB0.2 dB0.3 % + 250.3 % + 250.3 % + 250.3 % + 250.3 % + 250.3 % + 251.5 dB1.0 dB0.1 dB0.1 dB0.1 dB2 % + 802 % + 402 % + 802 % + 40[4]L [4][1]Resolution1000 V0.1 VAccuracy65 Hz to 10 kHz0.4 % + 250.4 % + 250.6 % + 250.4 % + 250.4 % + 250.4 % + 252 dB1 dB0.1 dB0.1 dB0.1 dB2 % +10[2]-6 % -602 % + 40Below 5 % of range, add 20 counts.[2]Specification increases linearly from -2 % at 200 Hz to -6 % at 440 Hz. Range is limited to 440 Hz.[3]dBm (600 ) is specified by adding +2.2 dB to the dBV range values.[4]289 only.[5]Add 2.5 % above 65 kHz.[6]Range is limited to 440 Hz.See Detailed Specifications introduction for additional information.68[6]10 to 20 kHz20 to 100 kHz0.7 % + 400.7 % + 401.5 % + 400.7 % + 40Not SpecdNot Specd2 dB1 dB0.2 dB0.2 dBNot Specd3.5 % + 403.5 % + 40[5]3.5 % + 403.5 % + 40Not SpecdNot Specd3 dB2 dB0.8 dB0.8 dBNot SpecdNot SpecdNot SpecdNot SpecdNot Specd[5]
  • Page 79

    True-rms Digital MultimetersDetailed SpecificationsAC Current SpecificationsFunction[3]AC AAC mAAC A[2][3]RangeResolution500 A0.01 A5000 A50 mA400 mA5A[1]10 A0.1 A0.001 mA0.01 mA0.0001 A0.001 A[1]10 A range (10 % to 100 % of range).[2]20 A for 30 seconds on, 10 minutes off. >10 A not specified.[3]400 mA continuous; 550 mA for 2 minutes on, 1 minute off.[4]Verified by design and type tests.20 to 45 Hz1 % + 20Accuracy45 to 1 kHz1 to 20 kHz0.6 % + 200.6 % + 2020 to 100 kHz[4]5 % + 401%+50.6 % + 50.6 % + 105 % + 401 % + 201%+51.5 % + 201.5 % + 50.6 % + 200.6 % + 50.8 % + 200.8 % + 50.6 % + 201.5 % + 10[4]3 % + 40[4]3 % + 105 % + 405 % + 40Not SpecdNot SpecdSee Detailed Specifications introduction for additional information.69
  • Page 80

    287/289Users ManualDC Voltage SpecificationFunctionDC mVDC VL[1][1]Range[3]Resolution50 mV500 mV5V50 V500 V1000 V0.001 mV0.01 mV0.0001 V0.001 V0.01 V0.1 V1000 V0.1 VDCAccuracy[2]AC over DC, DC over AC, AC + DC20 to 45 Hz45 Hz to 1 kHz1 to 20 kHz20 to 35 kHz[2][4]0.05 % + 20[5]0.025 % + 20.025 % + 20.025 % + 20.03 % + 20.03 % + 22 % + 801 % + 20Not Specd0.5 % + 801.5 % + 401.5 % + 401.5 % + 401.5 % + 40Not SpecdNot Specd5 % + 405 % + 405 % + 405 % + 40Not SpecdNot SpecdNot SpecdNot SpecdNot Specd[1]Add 20 counts in dual display ac over dc, dc over ac or ac+dc.[2]AC+DC ranges are specified from 2 % to 140 % of range, except 1000 V is specified from 2 % to 100 % of range.[3]When using the relative mode (REL Q) to compensate for offsets.[4]Add 4 counts/10 mV AC in dual display ac over dc, dc over ac or ac + dc[5]Add 10 counts/100 mV AC in dual display ac over dc, dc over ac or ac + dc.70
  • Page 81

    True-rms Digital MultimetersDetailed SpecificationsDC Current SpecificationsFunction[4]DC ADC mADC A[2][4]RangeResolutionDCAccuracy[1]AC over DC, DC over AC, AC + DC[1][3]20 to 45 Hz45 Hz to 1 kHz1 to 20 kHz[5]20 to 100 kHz500 A0.01 A0.075 % + 201 % + 200.6 % + 200.6 % + 205000 A50 mA400 mA5A10 A0.1 A0.001 mA0.01 mA0.0001 A0.001 A0.075 % + 21%+50.6 % + 50.6 % + 105 % + 401 % + 201%+51.5 % + 201.5 % + 100.6 % + 200.6 % + 50.8 % + 200.8 % + 100.6 % + 201.5 % + 10[5]3 % + 40[5]3 % + 105 % + 405 % + 40Not SpecdNot Specd0.05 % + 100.15 % + 20.3 % + 100.3 % + 2[6][1]AC+DC ranges are specified from 2 % to 140 % of range.[2]20 A for 30 seconds on, 10 minutes off. >10 A not specified.[3]Add 20 counts in dual display ac over dc, dc over ac or ac+dc.[4]400 mA continuous; 550 mA for 2 minutes on, 1 minute off.[5]Verified by design and type tests.[6]Temperature coefficient: 0.1 X (specified accuracy)/ C (<18 C or > 28 C)5 % + 4071
  • Page 82

    287/289Users ManualResistance SpecificationsFunctionRange50 Resistance[1][3]500 [1][1]0.15 % + 200.01 0.05 % + 100.05 % + 20.001 k0.05 % + 20.01 k0.05 % + 25 M0.0001 M0.15 % + 430 M0.001 M1.5 % + 450 M0.01 M1.5 % + 450 M up to 100 M0.1 M3.0 % + 2100 M up to 500 M[2]50 nS0.1 M0.01 nS1 % + 1050 k[1]500 k[1]Accuracy0.001 0.0001 k5 kConductanceResolution8%+2When using the relative mode (REL Q) to compensate for offsets.[2]Add 20 counts above 33 nS in 50 nS range.[3]289 only.Temperature SpecificationsAccuracy[1,2]TemperatureResolution-200 C to +1350 C0.1 C1 % + 10-328 F to +2462 F0.1 F1 % + 18[1]Does not include error of the thermocouple probe.[2]Accuracy specification assumes ambient temperature stable to 1 C. For ambient temperature changes of 5 C, rated accuracy applies after 2 hours.72
  • Page 83

    True-rms Digital MultimetersDetailed SpecificationsCapacitance and Diode Test SpecificationsFunctionCapacitanceDiode Test[1]Range[1]ResolutionAccuracy1 nF[1]10 nF[1]100 nF0.001 nF0.01 nF0.1 nF1%+51%+51%+51 F0.001 F1%+510 F0.01 F1%+5100 F0.1 F1%+51000 F10 mF100 mF3.1 V1 F0.01 mF0.1 mF0.0001 V1%+51%+52 % + 201 % + 20With a film capacitor or better, using relative mode (REL ) to zero residual.73
  • Page 84

    287/289Users ManualFrequency Counter SpecificationsFunctionFrequency(0.5 Hz to 999.99 kHz, pulsewidth >0.5 s)[1][2]Duty Cycle[1][2]Pulse WidthRange99.999 Hz999.99 Hz9.9999 kHz99.999 kHz999.99 kHz1.00 % to 99.00 %0.1000 ms1.000 ms10.00 ms1999.9 msResolution0.001 Hz0.01 Hz0.0001 kHz0.001 kHz0.01 kHz0.01 %0.0001 ms0.001 ms0.01 ms0.1 ms[1]For rise times <1 s. Signals centered around trigger levels.[2]0.5 to 200 kHz, pulse width >2 s. Pulse width range is determined by the frequency of the signal.74Accuracy0.02 % + 50.005 % + 50.005 % + 50.005 % + 50.005 % + 50.2 % per kHz + 0.1 %0.002 ms + 3 counts0.002 ms + 3 counts0.002 ms + 3 counts0.002 ms + 3 counts
  • Page 85

    True-rms Digital MultimetersDetailed SpecificationsFrequency Counter SensitivityInput Range50 mV500 mV5V50 V500 V1000 VInput RangeApproximate Voltage Sensitivity[1](rms sine wave)15 Hz to 100 kHz5 mV25 mV0.25 V2.5 V25 V50 VApproximate Current Sensitivity(rms sine wave)15 Hz to 10 kHzAC BandwidthApproximate DCTrigger Levels[2]1 MHz1 MHz700 kHz1 MHz300 kHz300 kHzAC Bandwidth500 A25 A100 kHz5000 A50 mA400 mA5A10 A250 A2.5 mA25 mA0.25 A1.0 A100 kHz5 mV & 20 mV20 mV & 60 mV1.4 V & 2.0 V0.5 V & 6.5 V5 V & 40 V5 V & 100 VApproximate DC TriggerLevels100 kHz100 kHz100 kHz100 kHzNADC Bandwidth[2]600 kHz1 MHz80 kHz1 MHz300 kHz300 kHzDC BandwidthNA[1]Maximum input = 10 x range (1000 V maximum, 2 x 107 V-Hz product maximum). Noise at low frequencies and amplitudes may affect accuracy.[2]Typical frequency bandwidth with full scale (or maximum 2 x 107 V-Hz product) rms sine wave.75
  • Page 86

    287/289Users ManualMIN MAX, Recording, and Peak SpecificationsFunctionNominal Response200 ms to 80% (dc function)MIN MAX, Recording350 ms to 80 % (ac function)250 S (peak)PeakCrest Factor[1][1]350 ms to 80 %For repetitive peaks; 2.5 ms for single events. Peak not specified for 500 A DC, 50 mA DC, 5 A DC.[2]200 counts in 500 mV AC, 500 A AC, 50 mA AC, 5 A AC.[3]3 % in 500 mV AC, 500 A AC, 50 mA AC, 5 A AC.76AccuracySpecified accuracy 12 counts for changes >425 ms in duration in manualrange.Specified Accuracy 40 counts for changes >1.5 s in duration in manualrange.[2]Specified accuracy 100 counts up to 5,000 count (full range) reading.[3]For higher peak reading (to 12,000 counts), specified accuracy 2 % ofreading.For periodic waveforms from 50 to 440 Hz (4 % + 1 count).
  • Page 87

    True-rms Digital MultimetersDetailed SpecificationsInput CharacteristicsFunctionOverload[1] Input ImpedanceProtection1000 VL[2]Common ModeRejection Ratio(1 k unbalance)10 M <100 pF >120 dB at dc, 50 Hz or 60 Hz>60 dB at 50 Hz or 60 Hz10 M <100 pF >120 dB at dc, 50 Hz or 60 Hz>60 dB at 50 Hz or 60 HzFmV1000 VK1000 V10 M <100 pF(ac-coupled)>60 dB, dc to 60 HzL1000 V3.2 k <100 pF(ac-coupled)Not specifiedFunctionOverload[1]Protectione1000 V[2]50e1000 V[2]1000 V[2]GNormal Mode RejectionOpen CircuitTest Voltage5 V dc20 V decreasingto 2.5 V5 V dcNot specifiedFull Scale VoltageTypical Short Circuit CurrentTo 500 k 5 M or 50 nS 500 550 mV<5 V1 mA5 k50 k 500 k100 A 10 A1 A500 mV10 mA3.1 V dc1 mA[1]Input is limited to the product of a V rms sinewave times frequency of 2 x 107 V-Hz.[2]For circuits <0.5 A short circuit. 660V for high energy circuits.5 M0.3 A50 M500 M0.3 A0.3 A77
  • Page 88

    287/289Users ManualBurden Voltage (A, mA, A)FunctionmA, AA78RangeBurden Voltage500 A102 V/ A5000 A50.000 mA400.00 mA5.0000 A10.000 A102 V/ A1.8 mV/mA1.8 mV/mA0.04 V/A0.04 V/A



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