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 6240-01-038-3761
NSN 6220-01-188-5852
NSN 5960-00-605-0226
NSN 5930-01-491-9537
NSN 5990-01-502-8209
NSN 2925-01-359-4027
NSN 5935-00-391-0102
NSN 6240-00-185-8367
NSN 6110-01-214-4625
NSN 5965-01-109-2917
NSN 5950-01-309-4081
NSN 5835-01-270-7899