Bedienungsanleitung Fluke 289 (Seite 26 von 88) (Englisch)

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Users Manual

out open lead conditions so the Meter leads can be moved

between test points without triggering a display update.

Note

For temperature measurements, the AutoHold

threshold is a percent of 100 degrees. The default

AutoHold threshold is 4% of 100 degrees, or 4 degrees

Celsius or Fahrenheit.

Pressing H while in AutoHold mode, forces the Meter’s

display to update with the present measurement, just as if a

stable measurement had been detected.

To set the AutoHOLD Threshold Value, press the softkey labeled

Setup to access the setup menu. Using the cursor buttons, move

the menu selector next to the menu item labeled Recording and

press the softkey labeled Recording to open the recording setup

screen. Using the cursor buttons, move the menu selector next

to the menu item labeled Event Threshold for AutoHOLD and

then press the softkey labeled Edit. Press 7 or 8 to scroll

through the AutoHold threshold values. With the desired value

selected, press the softkey labeled Close.

Measuring Crest Factor

Crest factor is a measure of signal distortion and is calculated as

a signal’s peak value over its rms value. This is an important

measurement when looking at power quality issues.

The Meter’s crest factor function is only available for the ac

measurements: Vac, mVac, Aac, mAac, and μAac. With the

Meter in one of the ac measurement functions, press the softkey

labeled Menu. Next, move the menu selector next to the menu

item labeled Peak,CF and press the softkey labeled CF. The

crest factor value is displayed in the primary display while the ac

measurement appears in the secondary display. Frequency, duty

cycle, and pulse width are not allowed during crest factor

measurements.

Capturing Minimum and Maximum

Values

The MIN MAX Record mode captures minimum, average, and

maximum input values. When the input goes below the recorded

minimum value or above the recorded maximum value, the Meter

beeps and records the new value. The Meter stores the elapsed

time since the recording session was started at the same time.

The MIN MAX mode also calculates an average of all readings

taken since the MIN MAX mode was activated.

This mode is for capturing intermittent readings, recording

minimum and maximum readings unattended, or recording

readings while equipment operation precludes watching the

Meter. The MIN MAX mode is best for recording power supply

surges, inrush currents, and finding intermittent failures.

Response time is the length of time an input must stay at a new

value to be captured as a possible new minimum or maximum

value. The Meter has a 100 millisecond MIN MAX response time.

For example, a surge lasting 100 milliseconds would be captured

but one lasting only 50 milliseconds may not be captured at its

actual peak value. See the MIN MAX specification for more

information.

The true average value displayed is the arithmetic mean of all

readings taken since the start of recording (overloads are

discarded). The average reading is useful for smoothing out

unstable inputs, calculating power consumption, or estimating

the percentage of time a circuit is active.

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