6625-00-669-0080 (SCDL166412)
NSN 6625-00-669-0080 (NIIN 00-669-0080) 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 SCDL166412 (Us Army Communications & Electronics, CAGE 80063); also referenced as MILF11068 (Military Specifications); FR4U (Joint Electronics Type Designation); SMD166006 (Us Army Communications & Electronics).
Key specs: internal frequency calibrating crystal; 50 hertz minimum and 1 kHz maximum frequency; 0.1 to 20 MHz frequency response range; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); export Schedule B 9030.90.8030; ships at 20 lb / 4.0833 cu ft.