HP 8753E Service Manual page 185

Source Pretune Default Correction Constants (X&t 45)
This adjustment writes default correction constants for rudimentary phase lock
pretuning accuracy.
2. Observe the analyzer for the results of this adjustment routine:
If the analyzer displays Pretune Def DONE, you have completed this
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procedure.
If the analyzer displays FAIL, refer to Chapter 7, "Source
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Troubleshooting. '
3-8 Adjustments and Correction Constants