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 5960-01-495-0859
NSN 6130-01-244-8772
NSN 5835-01-307-8954
NSN 6150-00-622-9309
NSN 5945-01-173-2550
NSN 6145-01-309-7436
NSN 6645-01-085-4214
NSN 6240-00-760-0374
NSN 6110-00-227-0578
NSN 5925-01-512-0228
NSN 2925-00-724-3140
NSN 5920-00-152-4003