Monroe Electronics Electrostatic Voltmeter - Isoprobe® - model 279L - Manual (Page 15)

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7. Check the response to negative steps in a similar manner.
8. Switch to standby.
J. Noise Check:
1. Replace the oscilloscope with an rms voltmeter. Noise is typically 0.6mV rms.
K. Output Calibration:
1. Connect the rear panel output connector to a DVM
2. Adjust ZERO 1 for zero volts on the DVM and the front panel meter.
3. Slowly apply voltage to the test plate until it is precisely +300V.
4. The DVM at the output should +3.00V 0.1%. Adjust R5 if necessary to meet this condition.
5. The front panel meter should indicate +300.0 0.1% LSD.
6. Repeat steps 3 through 5 using –300v.
7. Remove the test equipment and replace the cover. This completes the adjustment procedure.