HP 54753A User Manual page 48

Factory Calibration Summary
Calibration What is calibrated
Mainframe Calibration Accuracy and continuity
of the timescale
C A U T I O N To prevent access to the mainframe calibration switch, place a sticker over the
access hole to this switch.
C A U T I O N Do not attempt a Mainframe calibration without consulting the HP 83480A,
54750A Service Guide.
Setup Channel Menu
Factory Mainframe Calibration
Measurements
Affected
All time base
measurements.
A mainframe calibration should be performed on a periodic basis (at least
annually), or when the ambient operating has changed by and remains 5°C
different than the operating temperature at which the last mainframe
calibration was performed. To see how much the operating temperature has
changed since the last mainframe calibration and the date of the last mainframe
calibration, check the Calibration status by pressing the following key sequence:
Utility, Calibrate , and then Cal status on.
The temperature change is displayed at the top of the display as shown in the
following figure.
3-14
Recommended
Softkey Path
Interval
Annually at HP service Utility
center or if operating Calibrate
Calibrate frame
temp has changed and
remains 5°C or more
from calibration
temperature. See
service manual.