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VC-7055BT
Digital Multimeter
Quick Guide
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  • Page 1

    VC-7055BT
    Digital Multimeter
    Quick Guide



  • Page 2

    General Warranty
    We warrant that the product will be free from defects in materials and workmanship for a
    period of 3 years (1 year for accessories) from the date of purchase of the product by the
    original purchaser from our company. This warranty only applies to the original purchaser
    and is not transferable to a third party.
    If the product proves defective during the warranty period, we will either repair the
    defective product without charge for parts and labour, or will provide a replacement in
    exchange for the defective product. Parts, modules and replacement products used by our
    company for warranty work may be new or reconditioned like new. All replaced parts,
    modules and products become the property of our company.
    In order to obtain service under this warranty, the customer must notify our company of
    the defect before the expiration of the warranty period. Customer shall be responsible for
    packaging and shipping the defective product to the designated service centre, a copy of
    the customers proof of purchase is also required.
    This warranty shall not apply to any defect, failure or damage caused by improper use or
    improper or inadequate maintenance and care. We shall not be obligated to furnish service
    under this warranty a) to repair damage resulting from attempts by personnel other than
    our company representatives to install, repair or service the product; b) to repair damage
    resulting from improper use or connection to incompatible equipment; c) to repair any
    damage or malfunction caused by the use of not our supplies; or d) to service a product
    that has been modified or integrated with other products when the effect of such
    modification or integration increases the time or difficulty of servicing the product.

    Please contact the nearest Sales and Service Offices for services.
    Excepting the after-sales services provided in this summary or the applicable
    warranty statements, we will not offer any guarantee for maintenance definitely
    declared or hinted, including but not limited to the implied guarantee for
    marketability and special-purpose acceptability. We should not take any
    responsibilities for any indirect, special or consequent damages.



  • Page 3

    Table of Contents
    1.Safety Information ...................................................................................................... 1
    Safety Terms and Symbols ..................................................................................................... 1
    General Safety Requirements ................................................................................................ 2
    Measurement Limits .............................................................................................................. 3
    Main Input Terminals (HI Input and LO Input) Measurement Limits ....................................................... 3
    Current Input Terminal (I) Measurement Limits ...................................................................................... 3
    Sense Terminals (HI Sense and LO Sense) Measurement Limits .............................................................. 4

    Measurement Category ......................................................................................................... 4

    2.Quick Start .................................................................................................................. 5
    General Inspection ................................................................................................................. 5
    Dimensions ............................................................................................................................ 5
    Foot Stool Adjustment ........................................................................................................... 6
    Front Panel Overview ............................................................................................................ 6
    Rear Panel Overview.............................................................................................................. 8
    User Interface ........................................................................................................................ 9
    Power On............................................................................................................................... 9
    Measurement Connections .................................................................................................. 10
    Data Record Function .......................................................................................................... 11
    Manual Record ....................................................................................................................................... 11
    Auto Record............................................................................................................................................ 12

    Troubleshooting .................................................................................................................. 13

    3.Appendix ................................................................................................................... 14
    Appendix A: Enclosure ......................................................................................................... 14
    Appendix B: General Care and Cleaning ............................................................................... 14
    Appendix C: Line Fuse Replacement ..................................................................................... 15

    i



  • Page 4

    1.Safety Information

    1. Safety Information
    Safety Terms and Symbols
    Safety Terms
    Terms in this Manual. The following terms may appear in this manual:
    Warning: Warning indicates the conditions or practices that could result in
    injury or loss of life.
    Caution: Caution indicates the conditions or practices that could result in
    damage to this product or other property.
    Terms on the Product. The following terms may appear on this product:
    Danger: It indicates an injury or hazard may immediately happen.
    Warning: It indicates an injury or hazard may be accessible potentially.
    Caution: It indicates a potential damage to the instrument or other property might occur.

    Safety Symbols
    Symbols on the Product. The following symbol may appear on the product:
    Direct current (DC)

    Warning, risk of electric shock

    Alternating current (AC)

    Caution, risk of danger (refer to this
    manual for specific Warning or
    Caution information)

    Both direct and
    alternating current

    Conforms to European Union
    directives

    Ground terminal

    Chassis Ground

    IEC Measurement Category I. The maximum measurable
    voltage is 1000 Vpk in the HI -LO terminal.
    IEC Measurement Category II. Inputs may be connected to AC
    mains power (up to 600 VAC) under Category II overvoltage
    conditions.
    This product complies with the WEEE Directive (2012/19/EC)
    marking equipment. The affixed product label indicates that
    you must not discard this electrical/electronic product in
    domestic household waste.

    1



  • Page 5

    1.Safety Information

    General Safety Requirements
    Before any operations, please read the following safety precautions to avoid any
    possible bodily injury and prevent this product or any other products connected from
    damage. In order to avoid any contingent danger, this product is only used within the
    range specified.


    Use Proper Power Cord. Use only the power cord supplied with the product and
    certified to use in your country.



    Product Grounded. This instrument is grounded through the power cord grounding
    conductor. To avoid electric shock, the grounding conductor must be grounded. The
    product must be grounded properly before any connection with its input or output
    terminal.



    Limit operation to the specified measurement category, voltage, or amperage
    ratings.



    Check all Terminal Ratings. To avoid instrument damage and the risk of electric shock,
    check all the Measurement Limits and markers of this product. Refer to the user's
    manual for the Measurement Limits before connecting to the instrument. Do not
    exceed any of the Measurement Limits defined in the following section.



    Do not operate without covers. Do not operate the instrument with covers or panels
    removed.



    Use Proper Fuse. Use only the specified type and rating fuse for this instrument.



    Avoid exposed circuit. Do not touch exposed junctions and components when the
    instrument is powered.



    Do not operate if in any doubt. If you suspect damage occurs to the instrument,
    have it inspected by qualified service personnel before further operations.



    Use your instrument in a well-ventilated area. Inadequate ventilation may cause
    increasing of temperature or damages to the device. Please keep well ventilated and
    inspect the intake regularly.



    Do not operate in wet conditions. In order to avoid short circuiting to the interior of
    the device or electric shock, please do not operate in a humid environment.



    Do not operate in an explosive atmosphere.



    Keep product surfaces clean and dry.



    Only the qualified technicians can implement the maintenance.

    2



  • Page 6

    1.Safety Information

    Measurement Limits
    The protection circuitry of the multimeter can prevent damage to the instrument and
    protect against the danger of electric shock, when the Measurement Limits are not
    exceeded. To ensure safe operation of the instrument, do not exceed the Measurement
    Limits shown on the front panel, it is defined as follows:

    The user-replaceable 10 A current-protection fuse is on the front panel. To maintain
    protection, replace fuse only with fuse of the specified type and rating. About the
    specified type and rating of the fuse, please refer to "7 Current Terminal Fuse" in "Front
    Panel Overview" on page 7.

    Main Input Terminals (HI Input and LO Input) Measurement Limits
    The HI and LO input terminals are used for voltage, resistance, continuity, frequency
    (period), capacitance, diode, and temperature test measurements. Two Measurement
    Limits are defined for these terminals:
    HI Input to LO Input Measurement Limit
    The Measurement Limit from HI Input to LO Input is 1000 VDC or 750 VAC, which is
    also the maximum voltage measurement. This limit can also be expressed as 1000
    Vpk maximum.
    LO Input to Ground Measurement Limit
    The LO input terminal can safely "float" a maximum of 500 Vpk relative to ground,
    where ground is defined as the Protective Earth Conductor in the AC mains power
    cord connected to the instrument.
    As implied by the above limits, the Measurement Limit for the HI input terminal is a
    maximum of 1500 Vpk relative to ground when LO Input is at its maximum of 500 Vpk
    relative to ground.

    Current Input Terminal (I) Measurement Limits
    The Measurement Limit from the current input terminal (I) to the LO Input terminal is 10
    A (DC or AC). Note that the current input terminals will always be at approximately the
    3



  • Page 7

    1.Safety Information
    same voltage as the LO Input terminal, unless a current protection fuse is open.

    Sense Terminals (HI Sense and LO Sense) Measurement Limits
    The HI and LO sense terminals are used for four-wire resistance measurements.
    The Measurement Limit from HI Sense to LO Input is 200 Vpk.
    The Measurement Limit from HI Sense to LO Sense is 200 Vpk.
    The Measurement Limit from LO Sense to LO Input is 2 Vpk.
    Note: The 200 Vpk limit on the sense terminals is the Measurement Limit. Operational
    voltages in resistance measurements are much lower – up to ± 3 V in normal operation.

    Measurement Category
    The safety rating of the multimeter:
    1000 V, CAT I
    IEC Measurement Category I. The maximum measurable voltage is 1000 Vpk in the HI -LO
    terminal.
    600 V, CAT II
    IEC Measurement Category II. Inputs may be connected to AC mains power (up to 600
    VAC) under Category II overvoltage conditions.

    Measurement category definition
    Measurement CAT I applies to measurements performed on circuits not directly
    connected to the AC mains. Examples are measurements on circuits not derived from the
    AC mains and specially protected (internal) mains- derived circuits.
    Measurement CAT II applies to protect against transients from energy-consuming
    equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and
    other household circuits.
    Measurement CAT III applies to protect against transients in equipment in fixed
    equipment installations, such as distribution panels, feeders and short branch circuits,
    and lighting systems in large buildings.
    Measurement CAT IV applies to measurements performed at the source of the lowvoltage installation. Examples are electricity meters and measurements on primary over
    current protection devices and ripple control units.

    4



  • Page 8

    2.Quick Start

    2. Quick Start
    General Inspection
    After you get a new multimeter, it is recommended that you should make a check on the
    instrument according to the following steps:
    1. Check whether there is any damage caused by transportation.
    If it is found that the packaging carton or the foamed plastic protection cushion has
    suffered serious damage, do not throw it away first till the complete device and its
    accessories succeed in the electrical and mechanical property tests.
    2. Check the Accessories
    The supplied accessories have been already described in the Appendix A: Enclosure
    of this Manual. You can check whether there is any loss of accessories with reference
    to this description. If it is found that there is any accessory lost or damaged, please
    get in touch with our distributor responsible for this service or our local offices.
    3. Check the Complete Instrument
    If it is found that there is damage to the appearance of the instrument, or the
    instrument cannot work normally, or fails in the performance test, please get in
    touch with our distributor responsible for this business or our local offices. If there is
    damage to the instrument caused by the transportation, please keep the package.
    With the transportation department or our distributor responsible for this business
    informed about it, a repairing or replacement of the instrument will be arranged by
    us.

    Dimensions
    235 mm

    110 mm

    5



  • Page 9

    2.Quick Start

    295 mm

    Foot Stool Adjustment
    Unfold the foot stool on the bottom of the multimeter.

    Front Panel Overview
    3

    4

    2

    5

    1
    6
    7
    9

    11

    10

    8

    12

    Figure 2-1 Front panel overview
    Item Name

    Description

    1

    LCD

    Display the user interface

    2

    Menu selection
    Keys

    Activate the corresponding menu

    3

    Operation Keys
    Save

    Collect data in manual record. The instrument saves
    current reading each time the Save key is pressed. See
    page 11, Manual Record.
    6



  • Page 10

    2.Quick Start
    Record

    Access menus of manual record and auto record.
    See page 11, Data Record Function.

    Run/Stop

    Start or stop auto trigger. When the trigger is stopped, the
    displayed data will be held.

    Math

    Perform math operations (Max/Min, dB/dBm) on the
    measurement results.

    Utility

    Set the auxiliary system function, including Language,
    Backlight, Clock, Default.

    Port

    Set Serial port.

    4

    HI and LO Sense
    Terminals

    Signal input terminals, used for four-wire resistance
    measurements.

    5

    HI and LO Input
    Terminals

    Signal input terminals, used for voltage, resistance,
    continuity, frequency (period), capacitance, diode, and
    temperature test measurements.

    6

    Range/Direction Keys When the Range softkey is shown on the right menu, you
    can press the

    key to switch between auto and

    manual range. Press

    to enable manual range, and

    increase or decrease the measurement range.
    When setting a parameter, press
    press

    to move the cursor,

    to increase or decrease the value.

    7

    Current Terminal
    Fuse

    8

    AC/DC Current Input Signal input terminals, used for AC/DC current
    Terminals
    measurements.

    9

    Power button

    The rating is 10 A, 250 VAC.
    To replace the fuse:
    Turn off the multimeter and remove the power cord. Use a
    flat-blade screw driver to turn the fuse holder
    counter-clockwise, and pull out the fuse holder. Put the
    new specified fuse into the fuse holder, and insert the
    assembly back into the instrument, turning the fuse holder
    clockwise to lock it in place.

    Turn on/off the multimeter.

    7



  • Page 11

    2.Quick Start
    10

    Measurement
    Function Keys

    DC or AC voltage measurements
    DC or AC current measurements
    Resistance, continuity, and diode measurements
    Capacitance measurements
    Frequency/Period measurements
    Temperature measurements

    11

    Dual

    Press this key to display the function list on the right menu,
    select a function, if the function is supported, the reading
    will be displayed in the Vice Display.

    12

    Dual Exit

    Press the key to exit dual display mode.

    Rear Panel Overview
    5 4
    3
    2
    1

    Figure 2-2 Rear panel overview
    Item Name

    Description

    1

    RS232

    Connect the PC through this port.

    2

    Line Fuse

    The fuse rating is 250 V, F1AL. To replace the fuse, see page
    15, Appendix C: Line Fuse Replacement.

    3

    AC Mains Input

    AC mains input connector.

    4

    Chassis Ground
    Screw

    To ground the chassis.

    5

    Instrument Cable
    Lock

    You can lock the instrument to a fixed location using the
    security lock (please buy it yourself) to secure the
    instrument.

    8



  • Page 12

    2.Quick Start

    User Interface
    Trigger Mode

    Status Icon

    Reading

    Operation Menus
    Unit

    Range

    Trigger Mode
    Display

    Function

    Status Icon
    Description

    Trigger

    Icon

    Auto trigger

    Description
    Auto record function is running
    Manual record

    Figure 2-3 User interface

    Primary function reading

    Secondary function

    Primary function

    Figure 2-4 User interface (Dual display)

    Power On
    (1) Connect the instrument to the 90 - 240 V AC supply using the supplied power cord.
    Warning:
    To avoid electric shock, the instrument must be grounded properly.
    (2) Press down the power button at the front panel, the screen shows the progress bar,
    and then the user interface will be displayed.
    9



  • Page 13

    2.Quick Start

    Measurement Connections
    After selecting the desired measurement function, please connect the signal (device)
    under test to the multimeter according to the method below. To avoid instrument
    damage, do not discretionarily switch the measurement function when measuring.
    DC Voltage Measurement

    AC Voltage Measurement

    DC Voltage

    AC Voltage

    DC Current Measurement

    AC Current Measurement

    DC Current

    AC Current

    2-wire Resistance Measurement

    4-wire Resistance Measurement

    I

    I

    2-wire Resistance

    4-wire Resistance

    Continuity Test

    Diode Measurement

    I

    I

    Open or Closed Circuit

    10

    Forward Bias



  • Page 14

    2.Quick Start
    Frequency/Period Measurement

    Capacitance Measurement

    Capacitance

    AC Signal

    Temperature Measurement

    I
    Temp Transducer

    Data Record Function
    Data record function includes manual record and auto record. You can use any or both
    functions to record the data. The readings recorded in manual record or auto record will
    be saved into a same data table in the internal memory. The maximum number of
    readings is 1000. Once you have finished collecting data, you can view it in data table,
    and export it to a computer via RS232 port.
    Manual record: Press the front panel
    table of the internal memory.

    key to save current reading to the data

    Auto record: After setting number of points, sample interval, press the Start softkey to
    start recording. After recording, you can view the data saved in the data table of the
    internal memory.

    Manual Record
    1. Collect data: The instrument saves current reading in the data table of the internal
    memory each time the front panel
    key is pressed. The
    icon will show
    up on the top of the display.
    Note:
     The measurement function can be switched during manual record.
     When the dual display is enabled, only the reading of main display function can be
    saved.
    2. View the manual record: Press the front panel
    key, press the Manual softkey
    to display the data table. Press
    keys to turn the page. (When the data table is
    11



  • Page 15

    2.Quick Start
    shown, you can still save current reading by pressing the

    key.)

    Note:
     When the recording data exceeds the current range, the data will be marked as
    "overload".
     When the relative operation is turned on, the recorded data will still be the original
    readings without relative operation.

    3. Clear the manual record: Press the Clear softkey to clear current manual record.
    (Note: The auto record data will also be cleared, since they share the same data
    table.)

    Auto Record
    1. Configure the parameters: Press the front panel

    key, press the Auto softkey.

    Press the Point softkey to specify the total number of readings to record. The range is
    1 to 1000.
    Press the Interval softkey to specify the time interval between readings. The range is
    15 ms to 9999.999 s.

    2. Record data: Press the Start softkey to start auto record. The

    icon will show up

    on the top of the display. Press the End softkey to stop recording, the recorded
    readings will be displayed in the data table. Press

    keys to turn the page.

    Note:
     The measurement function can be switched during auto record.
     In auto range, the relay switch may cause jitter, the data at this time is invalid. It
    12



  • Page 16

    2.Quick Start
    will last about a few hundred milliseconds, and the data acquired in this period will
    be marked as "invalid".
     When the dual display is enabled, only the reading of main display function can be
    saved.

    Troubleshooting
    1. The instrument is powered on but no Display.
    1) Check if the power is connected properly.
    2) Check if the line fuse which is below the AC Mains Input is used appropriately and
    in good condition (see page 15, Appendix C: Line Fuse Replacement).
    3) Restart the instrument after the steps above.
    4) If the problem still exists, please contact us for our service.
    2. The reading does not change when a current signal is input.
    1) Check whether the test lead is correctly inserted into the current input terminals
    (I terminal and LO Input terminal).
    2) Check whether the current terminal fuse at the front panel is burned out.
    Please refer to "7 Current Terminal Fuse" in "Front panel overview" on page 7.
    3) Check whether the DCI or ACI measurement function is enabled.
    4) Check whether the DCI measurement function is used to measure AC current.
    If you encounter other problems, try to reset the settings or restart the instrument. If it
    still cannot work properly, please contact us for our service, and provide your device
    information (press the front panel

    key to view it).

    13



  • Page 17

    3.Appendix

    3. Appendix
    Appendix A: Enclosure
    Standard Accessories (subject to final delivery):

    Power Cord

    Quick Guide

    Safety Hintsheet

    Software CD

    Spare Fuses

    Test Leads

    Crocodile Clips

    Appendix B: General Care and Cleaning
    General Care
    Do not store or leave the instrument where the liquid crystal display will be exposed
    to direct sunlight for long periods of time.
    Cleaning
    To clean the instrument exterior, perform the following steps:
    1.

    To prevent electrical shock, disconnect the instrument from AC mains power
    and disconnect all test leads before cleaning.

    2.

    Clean the outside of the instrument using a wet soft cloth not dripping water. Do
    not make any scuffing when cleaning the LCD screen. To avoid damage to the
    instrument, do not use any corrosive chemical cleaning agent.

    Caution: To avoid any damage to the instrument, do not exposed it to any sprays,
    liquids, or solvents.
    Warning: Before power on again for operation, it is required to confirm that
    the instrument has already been dried completely, avoiding any
    electrical short circuit or bodily injury resulting from the moisture.

    14



  • Page 18

    3.Appendix

    Appendix C: Line Fuse Replacement
    The line fuse is in the plastic fuse box below the power line input on the rear panel.
    Warning: Disconnect the line cord at the rear panel and remove all test leads
    connected to the instrument before replacing the line fuse. Failure
    to do so could expose the operator to hazardous voltages that could
    result in personal injury or death.
    Use only the correct fuse type. Failure to do so could result in personal injury or
    instrument damage.
    Voltage

    Fuse

    90 - 240 V AC

    250 V, F1AL

    To perform the line fuse replacement, follow these steps:
    1.

    Turn off the multimeter, remove all measurement leads and other cables from the
    instrument, including the power cord.

    2. Use a flat-blade screwdriver to remove the fuse box.

    3.

    Replace the fuse with a new one, which should match with the rating; install it into
    the fuse box, and push the fuse box back on to the rear panel.

    2019.09

    15

    V1.0.0






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