An item that can generate a fundamental frequency with a high degree of accuracy. Harmonics of this fundamental are then used as a reference point for checking throughout the radio spectrum. The standard may be stable crystal oscillator, noncrystal oscillator, tuning fork, atomic beam, molecular beam, gas cell, quantum mechanical resonator, or the like.
Classification: Parts and accessories of articles of schedule b subheading 9030.39
NSN 5910-01-368-5410
NSN 5930-01-208-8925
NSN 5910-01-592-4902
NSN 5999-01-147-5317
NSN 6645-01-381-6084
NSN 5975-01-499-8730
NSN 5950-00-196-0824
NSN 5905-00-942-9326
NSN 5985-00-848-8143
NSN 6135-01-168-2944
NSN 5960-01-057-9186
NSN 6320-01-209-0952