Patent ID: 9664720
Date: 2017-05-30
CPC Classifications: G01R

Claim:
1. A device for contactless determination of an electrical potential of an object, comprising: an electrode spaced apart from the object, the electrode being connected to a reference potential, wherein the electrode is surrounded by an electric field meter; a potentiometer electrically connected to the electrode to change the reference potential present at the electrode to an end value, at which a charge-reversal current flowing between the electrode and a reference potential carrier disappears, and to determine the electrical potential of the object from the end value; a movable device for periodically arranging a field stop between the object and the electrode, so that, at first times, an electrical field is formed between the electrode and the object and, at second times, the electrical field is shielded by the field stop, wherein the potentiometer determines a temporally constant electrical potential of the object; and an amplifier, said amplifier comprising a first input, a second input and an output, wherein the electrode is electrically connected to the first input of the amplifier, the potentiometer is electrically connected to the second input of the amplifier, and the first input of the amplifier is electrically connected to the output of the amplifier, wherein the field stop is electrically connected directly to both the second input of the amplifier and to the reference potential.