A current-comparator-based four-terminal resistance bridge...

Details A current-comparator-based four-terminal resistance bridge... A current-comparator-based four-terminal resistance bridge...

G - Physics

01

R

G01R 27/02 (2006.01) G01R 15/00 (2006.01) G01R 27/08 (2006.01)

Patent

CA 2376732

A current comparator technique is applied to four-terminal resistance measurements for obtaining a highly accurate AC resistance bridge at power frequencies of 50 Hz to 60 Hz. Active circuits are used to establish equal voltage drops between the potential terminals of the two resistances being compared. The bridge is suitable for measuring resistances from 10µ.OMEGA. to 100k.OMEGA.. A cascading technique using two two-stage current transformers provides extension of the ratio range to 100,00,000 with a maximum applied current of 10,000A. The bridge features measurement with a resolution of 0.1x10 -6. The total combined uncertainty (2a) of the bridge including the range extenders, at power frequencies, is estimated to be less than 5 µ.OMEGA./.OMEGA..

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