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12. Time Base Adjustment (SN 2848A to 3217A05567)
Note
3-102 Adjustments
15. On the Frequency Counter, select a 1 second gate time by
pressing, t-1 1 @Y%YiK]. The Frequency Counter should
now display the difference between the frequency of the INPUT
A signal and 10.0 MHz with a resolution of 0.01 Hz (10 mHz).
Do not use a metal adjustment tool to tune an oven-controlled
crystal oscillator (OCXO). The metal will conduct heat away from the
oscillator circuit, shifting the operating conditions.
Use a nonconductive adjustment tool to adjust the 18-turn FREQ
16.
ADJ capacitor on the A27A2 10 MHz Quartz Crystal Oscillator for
a Frequency Counter indication of 0.00 Hz. See Figure 3-55 for
the location of the A27A2 10 MHz Quartz Crystal Oscillator.
Figure 3-55. Location of A27A2 Adjustment
On the Frequency Counter, select a 10 second gate time by
17.
pressing, [GATETIME) 10 C-1. The Frequency Counter
should now display the difference between the frequency of the
INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz (1
18.
Wait at least 2 gate periods for the Frequency Counter to settle,
and then adjust the FREQ ADJ capacitor on the A27A2 10
MHz Quartz Crystal Oscillator for a stable Frequency Counter
indication of (0.000 + Frequency Correction Factor) fO.O1O Hz.
19.
Replace
RF Section bottom cover and reconnect the short
the
jumper cable between the FREQ REFERENCE INT and EXT
connectors.
R F S e c t i o n ( b o t t o m view)
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