Expanded scale electrical measuring circuit

Details Expanded scale electrical measuring circuit Expanded scale electrical measuring circuit

1976-12-10

1978-02-21

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Suppressed zero

324115, G01R 1508

Patent

active

040755606

ABSTRACT:
An expanded scale measuring circuit including a four-arm bridge having a pair of input terminals for connections to a source of input voltage to be measured and a pair of measuring terminals between which are connected a current responsive meter. Located in one pair of the bridge arms are a resistor and diode that establish a reference voltage at one of the measuring terminals. The other pair of arms are formed by a voltage divider network including a zener diode that establishes a fixed reduction in the portion of input voltage applied to the other measuring terminal and therefore in the voltage appearing across the meter. By appropriately selecting resistance values for the divider network, a zero meter current condition is established for an input voltage at the bottom of a range of interest.

REFERENCES:
patent: 2584800 (1952-02-01), Grisdale
patent: 3263170 (1966-07-01), Schneider

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