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 5996-00-960-7810
NSN 2925-01-208-6638
NSN 6685-01-017-3046
NSN 6240-00-753-7586
NSN 5925-00-624-3060
NSN 5996-01-018-7990
NSN 5965-01-408-6218
NSN 6620-01-659-8887
NSN 5990-00-065-3617
NSN 6320-00-270-8222
NSN 5855-01-187-2293
NSN 6610-01-352-5500