The Seriesresistance Bridge

Perhaps the simplest and most straightforward of the bridges mentioned is the series-resistance bridge, using variable ratio arms to balance the unknown capacitance against a fixed standard and a variable resistance in series with the standard condenser to balance the losses in the unknown arm. The arrangement illustrated in Figure 2, using Type 602 Decade-Resistance Boxes, a Type 57B-A Transformer, and a Type 509 Standard Condenser has been found very satisfactory for measurements over a wide range of capacitance and power factor.

With this bridge, accurate results can be obtained if the various circuit and circuit-element residuals are measured and their effects on the capacitive and resistive balances computed.

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