WPI EVOM3 - Operations and Calibration; Instrument Diagnostics and Calibration

EVOM3
World Precision Instruments 21
OPERATIONS
IMPORTANT! Before you start making measurements, WPI recommends that you:
• Charge the EVOM3 battery or run under mains power.
• Clean and chloride the electrodes. See "Cleaning/Maintaining the STX2-PLUS
Electrodes" on page 26.
• If it is new, test the USB thumb drive. See "Sample Resistance File (*.CSV)" on
page 16.
• Validate the EVOM3 ing  Ω tet eit  aliate the EVOM3.
Instrument Diagnostics and Calibration
WPI recommends that EVOM3 be put through the diagnostics described below
ee ing it  the fit time and then eidiall theeate  thee i a nen
that the meter or the electrode is not functioning properly, the following protocols
ma e ed t nfim the EVOM3 operating status.
Testing the EVOM3 Meter (Resistance) and Calibration
1. Insert the 99673 test resistor into the electrode port on the meter’s right side.
2. On the main display, select the
Setup page. In the Mode units area, select Ohms
and 10,000. Press Return .
3. Verify that the blank handling is disabled (Setup>Blank Handling). The screen
should display 1000 Ω ±1 Ω. If it does not, select
Setup , push the Calibration
button and wait for the process to complete. (This process takes 30 seconds
to complete.) When the date and time are displayed, the calibration process is
complete.
4. Press
Return to access the main page. The display should show 1000 Ω ±1 Ω.
5. Press the
OK in the upper left of the octagonal icon on the main display page to
short the electrodes. Verify that the EVOM3 ead   Ω
6. To return to normal EVOM3 operation, unplug the test resistor and press the
button (uppper left).
Testing the EVOM3 Meter (Voltage)
1. On the main display, select the Setup page. Press the Short Electrodes button.
2. In the
Mode units area, select Millivolts . Press Return .
3. Press the
Probe Null button and then Disable . Press Return twice. The main display
should show 0.0 mV. If it does not, verify that the probe null is not active and
that it ha a  V et,  mV
4. Press the
button (uppper left) to remove the electrode short.
Test Resistor “Calibration Kit”
The 99673 test resistor is supplied to verify the calibration.