Digital conductance meter

Details Digital conductance meter Digital conductance meter

1978-09-27

1980-08-12

Karlsen, Ernest F.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

340347NT, G01R 2702, H03K 1302

Patent

active

042175437

ABSTRACT:
Determining the value of resistance directly, but inversely, based on conductance measurements, rather than directly, based on resistance measurements, is disclosed. A voltage drop of one polarity across a referenced resistance controls the charge rate of the capacitor of an integrator of a dual slope analog-to-digital converter for a known period of time. Thereafter the capacitor is discharged to a predetermined level (e.g., zero) for a measured period of time at a rate determined by a voltage drop of opposite polarity across an unknown resistance. The measured period of time is directly related to the conductance value of the unknown resistance and inversely related to the resistance value. The time measurement is stored in latches, which control a digital display.

REFERENCES:
patent: 3368149 (1968-02-01), Wasserman
patent: 3749894 (1973-07-01), Avdeef
patent: 3875503 (1975-04-01), Hayashi
patent: 3876933 (1975-04-01), Herrington

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