Product Details:
General Radio Model 1840-A-GRY "Digi-Bridge" automatic digital LCR test system. Type 1840-A output power meter is basically a multi-tapped audio-frequency transformer with a fixed secondary load. The fixed secondary load is reflected to eight identical primary windings. A front panel switch connects the eight primary coils in four different series and parallel combinations, and each primary combination is used with any one of six secondary taps, thus providing 24 different primary impedances. Each of these 24 impedances can in turn be multiplied by 250 with a second front panel switch. The end result is a total of 48 primary impedances. The use of grain-oriented silicon steel in a laminated core yields a 20-watt rating with a relatively small core. Interleaving of primary windings with secondary windings in two separate PI's permits measurements from 20 to 20,000 cps. Measures: 8" x 12" x 4"H. Includes copy of the operation manual.