Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1981-05-04
1983-10-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2702
Patent
active
044081570
ABSTRACT:
The invention employs a pair of known resistors which are permanently connected to the input terminals to which the unknown resistor may be connected. A source of d.c. voltage is connected to one input terminal and the voltage drops produced across each known resistor are alternately sampled and supplied to an A/D converter which converts these voltage drops into corresponding digital signals. A microprocessor computes the quantity VR1/VR2-1 where VR1 is the voltage drop across one known resistor and VR2 is the voltage drop across the other known resistor. The computed quantity is a linear function of the value of the unknown resistance. This computed quantity may then be converted to a corresponding analog signal and supplied to a meter. Since no switches are connected across the unknown resistor, leakage problems normally associated with extremely high resistance measurements are virtually eliminated and very high resistances in the order of 5000-10,000 megohms may be accurately measured and displayed.
REFERENCES:
patent: 3060379 (1962-10-01), Osvold
patent: 3633098 (1972-01-01), Westlund
Bailey: "Ohmmeter Reads to 300 Megohms".--Radio-Electronics, Apr. 1949--p. 55.
Scroggie: "A Valve Megohmmeter"--Wireless World--Nov. 1953, p. 516.
Krankel et al.: "A Method for Checking the Turn Insulation . . . " Brown-Boveri Review--4/1970--vol. 57.
Oliver et al. "Electronic Measurements and Instrumentation" McGraw Hill--1972.
Associated Research, Inc.
Krawczewicz Stanley T.
Solis Jose M.
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