
12. 10
MHZ
Standard Adjustment (SN 2728A and Above)
L.
TOP
VIEW
Figure 3-55. Location of 10 MHz Standard Adjustments
15. On the Frequency Counter, select a 10 second gate time by
pressing
(GATE-1
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
mHz).
16. Wait at least 2 gate periods for the Frequency Counter to settle,
and then adjust the FREQ ADJ capacitor on the
A22A2
10
MHz Quartz Crystal Oscillator for a stable Frequency Counter
indication of (0.000 + Frequency Correction Factor) fO.O1O Hz.
17. Replace the RF Section bottom cover and reconnect the short
jumper cable between the FREQ REFERENCE INT and EXT
connectors.
3-l 12 Adjustments
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