HP 8753E Service Manual page 186

Analog Bus Correction Constants ('I&t 46)
This procedure calibrates the analog bus by using three reference voltages
(ground, + 0.37 and +2.5 volts), then stores the calibration data as correction
constants in EEPROMs.
2. Observe the analyzer for the results of the adjustment routine:
If the analyzer displays ABUS Cor DONE, you have completed this
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procedure.
If the analyzer displays ABUS Cor FAIL, refer to Chapter 6, "Digital Control
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Troubleshooting. n
Adjustments and Correction Constants 3-8