Special Features:

Opt 004 is high performance cesium beam tube, avg life 10, 000 hrs; accuracy: porm 7 x 10e12 over temp 0-50 degrees c; stability: porm 3 x 10e1 (1); ssb phase noise signal (1 hz bw): -28 db at 10em3 hz/m140 db at 10e3; dc magnetic field stability: porm 2 x 10em13, 2 gauss field; front and rear bnc; reproducability: porm 3 x 10em12(3); settability: porm 1 x 10em13(3) ; ac magnetic field: less than 2 x 10em12 for 2 gauss peak

Properties:

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.