Digital volt-ohmmeter

Details Digital volt-ohmmeter Digital volt-ohmmeter

H - Electricity

03

M

324/63, 354/83

H03M 1/00 (2006.01) G01R 19/255 (2006.01)

Patent

CA 1060953

DIGITAL VOLT-OHMMETER ABSTRACT OF THE DISCLOSURE A low-cost but highly accurate ohmmeter for measuring milliohm resistan- ces 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.

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