Digital volt-ohmmeter

Details Digital volt-ohmmeter Digital volt-ohmmeter

1975-04-30

1976-08-31

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 324 62, H03K 1317

Patent

active

039784720

ABSTRACT:
A low-cost but highly accurate ohmmeter for measuring milliohm resistances is disclosed. The instrument employs a digital voltmeter (analog-to-digital converter) having an add-subtract mode which nulls any drift voltage following each measurement. A self biasing current source which eliminates common mode voltages to the high gain amplifier portion of the converter is used for resistance measurements.

REFERENCES:
patent: 3438024 (1969-04-01), Smith
patent: 3445839 (1969-05-01), Engelberg
patent: 3510603 (1970-05-01), Gaerttner
patent: 3711850 (1973-01-01), Kelly
peterson, "IBM Technical Disclosure Bulletin," vol. 6, No. 7, Dec. 1963, pp. 85-86.

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