Capacitive Balance

Circuit Residuals

The capacitance Csg, consisting of inter-shield capacitances of the transformer winding and the capacitance or point (1) to ground, appears across the iV arm and causes an error depending directly on the ratio of its magnitude to that of the standard. Across the unknown arm P is placed Cp0, which is the capacitance of point (2) to ground.

The magnitudes of the two capacitances thus placed across the lower arms of the bridge can be determined quite accurately by balancing the bridge with CSg connected alternately across the N and farms. With the connections shown, Cp0 is measured directly (if the standard

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