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12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above)
12. Time Base
Adjustment (SN
2840A
and Below,
also
3217AO5568
and Above)
Reference
Related Performance
Test
Description
Equipment
RF Section:
A27Al
10 MHz Quartz Crystal Oscillator
Center Frequency Readout Accuracy Test
The frequency of the internal 10 MHz Frequency Standard 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 Quartz Crystal Oscillator,
which are determined by 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
(not in STANDBY) for at least 72 hours immediately prior to oscillator
adjustment to allow both the temperature and frequency of the
oscillator to stabilize.
1
Figure 3-52. Time Base Adjustment Setup
Frequency Standard
...........................
HP
5061B
Frequency Counter
......................... HP
5334A/B
Cables:
BNC cable, 122 cm (48 in) (2 required) . . . . . . . . HP
10503A
Adjustments 3-95