Electrostatic voltmeter
A surface DC voltmeter is an instrument that measures voltage with no electric charge transfer.
The operating principle of an electrostatic voltmeter is similar to that of an electrometer; it is, however, designed to measure high potential differences, typically from a few hundred to many thousands volts.
An electrostatic voltmeter uses the attraction force between two charged surfaces to create a deflection of a pointer directly calibrated in volts.
An electrostatic voltmeter uses the attraction force between two charged surfaces to create a deflection of a pointer directly calibrated in volts.
To reduce the torque required and improve the sensitivity and speed of response, a small mirror attached to the rotor may replace the pointer with a light beam deflected by it over a scale.
