Electrostatic Voltmeter or sometimes called Surface DC Voltmeter are instruments that measure voltage even without the actual transfer of electric charge. These devices can measure voltages through close proximities of the probe, to the measured quantities.

This device is an answer to the uncertainty principle problem of measuring data. When measuring voltage distribution on a dielectric surface, any measurement technique that requires charge transfer, no matter how small, will modify or destroy the actual data. Thus Electrostatic Voltmeters may come in handy.

Below are links on the topic Electrostatic Voltmeters to help you understand more on the topic.

Using Electrostatic Voltmeters
Static problems are challenging to solve because static dissipaters, such as ionizing strings or static bars, should be located to treat the side of the film with static. An electrostatic voltmeter provides detailed information on the location, the amount, and the polarity of static. Specifically, an electrostatic voltmeter can verify which side of a film has static, and it can reveal when a film has suffered static discharges in previous operations. Read more...

How To Use an Electrostatic Voltmeter
Measuring static is important so we can understand the problem, identify possible solutions, and assess the feasibility and effectiveness of our alternatives. There are at least three different types of instruments that we can use to measure static: an electrostatic fieldmeter, the workhorse for diagnosing static problems; a Coulomb meter, which measures charge on objects or film samples that fit within a Faraday cup; and a non-contacting electrostatic voltmeter, which measures the surface potential of a film. Read more...

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