Noise and balance point characteristics of a.c. and d.c. bridges used for a.c/d.c. and d.c. resistance standards comparisons

Measurements were performed on a.c. and d.c. resistance standards, using both a.c. and d.c. bridges. The measurements identified the a.c./d.c. difference for both types of resistors. The signal-to-noise present on the combinations of measurements was recorded and their type A uncertainty was evaluated.