Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L User Manual download pdf (Page 23)

279L-0401-RCA Page 20

APPENDIX III

HV BREAKDOWN CONSIDERATIONS

Air is subject to dielectric breakdown when the probe-to-surface spacing is small and the difference in voltage

between the probe and the surface under test is high. A destructive arc-over can occur damaging the surface under

test and/or the sensitive circuitry of the probe. Under normal operating conditions this is usually not a problem as

the probe housing is driven to a voltage essentially identical to the unknown and the difference in voltage is very

close to zero.

Under normal circumstances the Model 279 ISOPROBE

Electrostatic Voltmeter can follow the unknown voltage up

to its high voltage amplifier limits — a few hundred volts above its specified range of ±3000 volts.

Figure A-III-1

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Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L User Manual Page 23