Testing instrument for detectlng alternating voltages in mains a

Details Testing instrument for detectlng alternating voltages in mains a Testing instrument for detectlng alternating voltages in mains a

1985-10-11

1988-02-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324 725, 324556, G01R 1914

Patent

active

047243821

ABSTRACT:
An electrical measuring or testing instrument is disclosed for detecting alternating voltages in mains, induced voltages in ungrounded conductors, and alternating electrical fields in the vicinity of voltage-carrying conductors. The instrument includes a constant-voltage source, a test prod, which is connected via a protective resistor to the input of an amplification circuit and via a further resistor and a switching transistor to the negative pole of the constant-voltage source, and an LED connected to the constant-voltage source and controlled by the amplifier circuit. The amplifier circuit has a very high amplification factor, so that even weak alternating fields in the vicinity of voltage-carrying conductors can be detected. The amplification is normally reduced with the aid of a resistor connected between the input of the amplifier circuit and the negative pole of the voltage source. If higher amplification is required, the connection between the resistor and the constant-voltage source can be interrupted with the aid of a foil sensor.

REFERENCES:
patent: 3828256 (1974-08-01), Liu
patent: 4006409 (1977-02-01), Adams
patent: 4027236 (1977-05-01), Stewart

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