Method and apparatus for measuring percent error of an impedance

Details Method and apparatus for measuring percent error of an impedance Method and apparatus for measuring percent error of an impedance

1976-12-28

1978-01-10

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

323 75N, G01R 2702

Patent

active

040681661

ABSTRACT:
The percent error in the value of a resistor, relative to a nominal value (R.sub.n) of the resistor is determined automatically with a Wheatstone bridge having first and second branches energized by a voltage source. The first branch includes first and second series connected resistors respectively having values P and Q. The second branch includes third and fourth series connected resistors respectively having values R and A; the third resistor is the resistor being measured for percent error. The fourth resistor has a value to establish bridge balance when R = R.sub.n. A diagonal is connected across a common terminal of the first and second resistors and a common terminal of the third and fourth resistors. A voltage source driving the two branches in parallel has a value in accordance with: ##EQU1## WHERE: K = P/Q and is much less than 1,

REFERENCES:
patent: 1324818 (1919-12-01), Hazard
patent: 2468625 (1949-04-01), Goetz
patent: 2980852 (1961-04-01), Mell
patent: 3539918 (1970-11-01), Boyd

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