RESISTIVITY MEASURING CIRCUIT USING CHOPPED DIRECT CURRENT.
DEFENCE RESEARCH TELECOMMUNICATIONS ESTABLISHMENT OTTAWA (ONTARIO)
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The voltage comparator circuit described by Dauphinee and Mooser has been changed so that the forward and reverse resistances of a non-uniform sample can be measured in addition to the average value normally measured. Modifications also allow sample resistances up to 100 megohms to be measured with an error not exceeding 1, whilst retaining the low resistance sensitivity of better than 0.0001 ohm. Author