46 Chapter2
Making Adjustments
4. 10 MHz Precision Frequency Reference
4. 10 MHz Precision Frequency Reference
This adjustment applies to:
All 8590 E-Series spectrum analyzers, Option 004
8591C cable TV analyzers
8594Q QAM analyzers
Replacement oscillators are factory adjusted after a complete warmup
and after the specified aging rate has been achieved. Readjustment
should not be necessary after oscillator replacement, and is not
recommended.
Note that the analyzer must be ON continuously for at least 24 hours
immediately prior to adjusting the oscillator to allow both the
temperature and frequency of the oscillator to stabilize. Failure to allow
sufficient stabilization time could result in the misadjustment of the
oscillator.
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 10 MHz Ovenized Crystal Oscillator (OCXO),
which are determined by characteristics of the particular oscillator and
the environmental and warmup conditions to which it has been recently
exposed. The 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.
Equipment Required
Frequency standard
Frequency counter
Cable, BNC, 122 cm (48 in) (two required)
Figure 2-7 Precision Frequency Reference Setup
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