WPI EVOM - Page 33

EVOM™ Manual
World Precision Instruments 29
3. Press the Mode Units button and choose either Millivolts or Volts for making
voltage measurements (Fig. 51). Press the Return button to go back to plate
settings screen (Fig. 50).
Fig. 51—(Right) Select the mode. For voltage measurements, choose Millivolts or Volts.
4. To calibrate (zero) the electrodes' galvanic charge in saline, place the electrodes in
a saline solution, and press the Probe Null button. A popup message displays (Fig.
52). Push the NULL button. Wait for the second message stating ”Solution value
0.0” before pressing the Return button. This action removes any voltage osets
on the electrodes. Then, activate the Enable/Disable radio button to oset the
electrode potential.
Fig. 52—(Left) Null probe process.
Fig. 53—(Right) The potential dierence oset shows on the main screen under the reading.
5. Press Return to navigate back to the main screen (Fig. 53).
Taking Measurements
Whether you are taking resistance or voltage measurements, the data acquisition
procedure is identical.
1. To begin measuring with well A1, do one of the following:
• Press the foot switch or touch the Store button on the main screen. A
measurement of the rst well is taken, and the data storage advances to the
next well in your sequence. Tap the Store button again to measure the next
well in your dened sequence.
NOTE: When required, you may use the
Previous Well area on the left side of
the screen to return to the last well and re-measure or the Next Well area on
the right side of the screen to skip a well. Then, press the Store button or the
foot switch to take the measurement of that cell.
• Press the Preview button to see a graphical display of the plate. The green cell
indicates the cell to be sampled, and the yellow cell indicates the next well in