136 Chapter3
Manual Adjustment Procedures
7. 10 MHz Reference Adjustment — OCXO
7. 10 MHz Reference Adjustment — OCXO
Assembly Adjusted
A21 OCXO assembly
NOTE Replacement oscillators are factory adjusted after a complete warmup
and after the specified aging rate has been achieved. Thus,
readjustment should typically not be necessary after oscillator
replacement and is generally not recommended.
Related Performance Test
10 MHz Reference Accuracy
Description
The frequency of the internal 10 MHz frequency reference is compared
to a known frequency standard and adjusted for minimum frequency
error. This procedure does not adjust the short-term stability or
long-term stability of the A21 10 MHz ovenized crystal oscillator
(OCXO). Stability is determined by the characteristics of the particular
oscillator and the environmental and warmup conditions to which it
has been recently exposed. The spectrum analyzer must be on
continuously for at least 24 hours immediately prior to oscillator
adjustment to allow both the temperature and frequency of the
oscillator to stabilize.
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