6625-00-669-0732 (S245-1024P1PT245-1024P1)
NSN 6625-00-669-0732 (NIIN 00-669-0732) is an electrical frequency meter in Federal Supply Class 6625, Electrical And Electronic Properties Measuring And Testing Instruments — an instrument which measures the rate of regularly recurring variations in an electric current or voltage and is usually calibrated in hertz (cycles per second. Manufacturer part number S245-1024P1PT245-1024P1 (Raytheon Company, CAGE 49956); also referenced as 21FX1 (Lee Co The J B T Div).
Key specs: 380 to 420 hertz frequency response range; 85 ohms per volt sensitivity; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); export Schedule B 9030.90.8030; ships at 0.01 lb / 0.001 cu ft. Supersedes 6625-00-643-2415 (1968), 6625-00-643-3041 (1963).