NON-CONTACT VOLTAGE MEASUREMENT DEVICE

摘要

There is provided a non-contact voltage measurement device which can precisely measure a measurement target voltage by suppressing a flow of a leakage current via a parasitic capacitance produced between an electric field shield and an electric circuit. A drive voltage applying unit applies a voltage generated from an output voltage of a low impedance unit of the electric circuit and equal to an input voltage of a high impedance unit, to a first electric field shield coated on the high impedance unit.

主权项

1. A non-contact voltage measurement device configured to, when placing a probe close to and in non-contact with a conductive wire to produce a coupling capacitance between the probe and the conductive wire, measure a measurement target voltage applied to the conductive wire based on a voltage signal input to an electric circuit via the probe, wherein
the electric circuit includes a first impedance unit and a second impedance unit of different impedance values, the first impedance unit in the electric circuit is arranged at a position closer to the probe than the second impedance unit is, and the non-contact voltage measurement device comprises: a first electric field shield configured to block an electric field entering the first impedance unit by coating at least part of the first impedance unit; and a voltage signal applying unit configured to generate an equivoltage signal equal to a voltage signal of the first impedance unit from a voltage signal of the second impedance unit, and configured to apply the generated equivoltage signal to the first electric field shield.