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Voltmeters
Electrostatic voltmeters provide non-contacting measurement of
electrostatic surface potential on insulating, conducting, or semiconducting materials. They are distinguished by their reliability, high accuracy -- typically 0.1% or better regardless of probe-to-surface spacing -- and by their ability to resolve targets as small as 0.1" (2.5mm) diameter or smaller.
Electrostatic voltmeters function by means of a high voltage
amplifier that automatically drives the probe to the same potential as that of the surface under measurement. By simply metering the output of the high voltage amplifier, one has an accurate indication of the unknown potential. This null seeking operation, using patented feedback circuitry, makes the instruments remarkably stable -- virtually drift free -- and highly accurate.
If you need to see voltages on PCBs, use a fieldmeter. If you need to see voltages on individual circuits, or leads on a DIP, voltmeters are your choice.
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