Digital panel meter

Details Digital panel meter Digital panel meter

1978-01-23

1979-06-05

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324119, 324123R, 324156, G01R 1512, G01R 1922, G01R 130

Patent

active

041575016

ABSTRACT:
The meter is primarily adapted to replace a standard analog panel meter and is designed to selectively receive different ranges of input signals such as DC input signals in ranges extending from 50 mVDC to 500 VDC. In the disclosed embodiment there are four ranges also adapted to receive AC input signals in ranges extending from 100 mVAC to 480 VAC. Preferably, a jumper is used to select the different ranges. The jumper is readily accessible at the rear of the meter. The meter circuitry comprises an analog to digital converter having three digit, seven segment display and input circuitry including a range circuit, an operational amplifier and filter circuitry coupling serially to the converter.

REFERENCES:
patent: 3183446 (1965-05-01), Richman
patent: 4037154 (1977-07-01), Chamran et al.
Thompson, L.; "A New Five-Digit Multimeter"; Hewlett-Packard J.; vol. 23; No. 12; Aug. 1972; pp. 7-12.

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