AC mains test apparatus and method

Details AC mains test apparatus and method AC mains test apparatus and method

1991-09-19

1994-08-09

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

3241581, 324 731, 324121R, G01R 1320, G01R 1508

Patent

active

053369890

ABSTRACT:
An ac mains test apparatus and method. An audio frequency signal measurement instrument is provided with a circuit for testing the ac mains to which the instrument is connected. The ac mains is internally connected to a coupler which presents an attenuated portion of the ac mains to the low level input of the instrument. A switch is provided for selectively connecting the input either to an audio signal to be measured or to the ac mains portion. The coupler both attenuates the ac mains for input to the instrument and isolates the relatively high ac mains voltage from the low level input.

REFERENCES:
patent: 3212003 (1965-10-01), Barrass et al.
patent: 3725784 (1973-04-01), Bayer
patent: 3906344 (1975-09-01), Addis et al.
patent: 4204152 (1980-05-01), Imrie
patent: 4585975 (1986-04-01), Wimmer
patent: 4859935 (1989-08-01), Smith et al.

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