Chapter 3 3-45
Adjustments and Correction Constants
Frequency Accuracy Adjustment
6. No adjustment is required if the spectrum analyzer measurement is within the
following specifications:
• ± 30 kHz for analyzers without Option 006
• ± 60 kHz for analyzers with Option 006
Otherwise, locate the A12 assembly (red extractors) and adjust the VCXO ADJ (see
Figure 3-18) for a spectrum analyzer center frequency measurement within
specifications.
7. Replace the A12 assembly if you are unable to adjust the frequency as specified. Repeat
this adjustment test.
Figure 3-18 Location of the VCXO ADJ 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.
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