The 1650-B Impedance Bridge (Figure 1*1) is a self-contained impedance-measuring system, which includes six bridges for the measurement of capacitance, resistance, conductance, and inductance, as well as the generators and detectors necessary for dc and I-kHz measurements. Features of this bridge include one-percent C, G, R, and L accuracy over all ranges, high D and Q accuracy, a mechanism to facilitate low Q measurement, a slow—motion mechanism on the CGRL dial, visual ac and dc null indications, complete portability, and a convenient tilting mechanism and carrying case. The slow-motion mechanism turns the CGRL dial slowly and effortlessly about a 1-in. sector. Extra torque must be applied to move the dial beyond the 1-in. sector. In the relaytack model (Figure 1-2), the captive cover of the Type 1650-B is replaced with a relay-rack adaptor panel