Relative Mode; Display Backlight; Data Storage - Extech Instruments EX540-NIST User Manual

Wireless trms multimeter
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RELATIVE MODE

The relative measurement feature allows you to make measurements relative to a stored reference
value. A reference voltage, current, etc. can be stored and measurements made in comparison to
that value. The displayed value is the difference between the reference value and the measured
value.
1.
Perform the measurement as described in the operating instructions.
2.
Press the REL button to store the reading in the display and the "▲" indicator will appear on
the display.
3.
The Right auxiliary display displays the initial reading (the stored value)
4.
The Left auxiliary display displays the actual currently measured value.
5.
Main display displays the Relative value (currently measured value minus the stored value).

DISPLAY BACKLIGHT

Press the
key to turn the backlight on. The backlight will automatically turn off after SET time.
Press the EXIT button to exit the backlight on mode.
HOLD
The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or
to exit the HOLD function.
PEAK HOLD
The Peak Hold function captures the peak AC or DC voltage or current. The meter can capture
negative or positive peaks as fast as 1 millisecond in duration.
Set the rotary dial to your preferred setting. Press and Hold the HOLD button for 3 seconds and
release. Now momentarily press the HOLD button, "PEAK" will appear along with "MAX" that will
display in left auxiliary display and MIN" will display in right auxiliary display. Momentarily press
the HOLD button again and "PEAK Hold" will appear. The meter will update the dispay each time a
higher or lower peak occurs. Press the EXIT button to exit the PEAK mode. Auto Power Off
feature will be disabled automatically in this mode.

DATA STORAGE

1.
Set the function switch to the measurement function desired.
2.
Press the STORE button to enter the STORE function. The left upper aux display indicates the
current storage location (0000 to 9999). New measurements will begin storing into the next
location.
3.
Press the PEAKHOLD button to change into the initial storage number 0000. (Press it again to
change back). On the right upper aux display shows XXXX which states how many current
storage locations are used.
4.
Press STORE button again to enter into recording interval time set up function.
5.
The left upper aux display indicates 0000 S, which is the recording sample rate; use the + & -
buttons to select the sample rate desired (0 to 255 sec)
6.
Set the sample rate to 0000 S for manual recording. In this mode, each press of the STORE
button will save one measurement reading.
7.
Set the sample rate to 1 to 255 S for automatic recording. In this mode, pressing the STORE
button will start data recording at the set sample rate.
8.
Press the EXIT button to end the recording session.
10
EX540-en-GB_v1.7 1/17

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