Agilent Technologies 8753ES Option 011 Service Manual page 154

Adjustments and Correction Constants
Frequency Accuracy Adjustment
NOTE To increase the accuracy of this adjustment, the following steps are
recommended.
8. Replace the instrument covers and wait 15 minutes in order to allow the analyzer to
reach its precise operating temperature.
9. Recheck the CW frequency and adjust if necessary.
Instruments with Option 1D5 Only
10.Reconnect the BNC-to-BNC jumper between the "EXT REF" and the "10 MHz Precision
Reference" as shown in
Figure 3-19 High Stability Frequency Adjustment Location
11.Insert a narrow screwdriver and adjust the high-stability frequency reference
potentiometer for a CW frequency measurement within specification.
In Case of Difficulty
Replace the A26 assembly if you cannot adjust the CW frequency within specification.
3-44
Figure 3-19.
Chapter 3