HP 54520 Series Service Manual page 75

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Chapter 4: Calibrating and Adjusting
To calibrate the firmware
Check that default calibration factors are loaded.
Press Utility ,then press service menu.
If default calibration factors are not loaded ("D's in the table on the screen), load
them.
Select 2. default cal, and press start cal then continue.
Press exit menu then self cal menu. Cal select 0 (0.vertical) should be
selected.
Press channel] to select all, then press start cal and follow the instructions on
the display.
Calibrating individual channels or all
If the entire calibration procedure fails while running all, run the calibrations individually. [fone
input is !oading the cal signal (an input stuck in 50 Q for example), calibration will fail for all inputs.
Individual calibration will isolate the failure.
After completing vertical cals, press cal select toselectcal select 1 (1.delay).
Press channel to select channel 1, then press start cal and follow the
instructions on the display.
Messages will be displayed as each calibration routine is completed to indicate
calibration has passed or failed.
When the delay cal is complete, press cal select toselect cal select 2 (2.time
null).
Press start cal and follow the instructions on the display.
When time null calibration is complete, press cal select toselectcal select 3
(3.logic trigger).
Press start cal and follow the instructions on the display.
If calibration fails
Go to chapter 5 Troubleshooting."