An internal modification to extend the conductance ranges of the General Radio Company type 1615-A capacitance bridge

Abstract

As supplied, the General Radio Co. type 1615‐A capacitance bridge can accommodate materials having loss tangents only as high as 1.0. A method of extending this capability, which does not involve additional external standards, and their attendant uncertainties, is described. The modified bridge may operate either as originally designed, with no deterioration in original performance, or in one of two new conductance ranges, greater than the original ones by a factor of 100. Slightly more involved calculations, allowing for the increased effect of stray capacitances, are required when the modification is in use. The new ranges must be compared with external precision standards initially in order to determine certain parameters used in these calculations. The results were most satisfactory.