HP 53131A, Assembly And Service Manual

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Chapter 2 Service
About the HP 53131A/132A Calibration Menu
2-6 Assembly-Level Service Guide
2
About the HP 53131A/132A Calibration Menu
NOTE If you are familiar with the information provided in this section, proceed
to the section titled “The HP 53131A/132A Calibration Procedures” on
page 2-15 to calibrate your Counter. This section, “About the
HP 53131A/132A Calibration Menu,” can be used as a reference.
NOTE With the exception of the standard timebase oscillator, no adjustments are
required for the HP 53131A/132A Counter.
Overview of the HP 53131A/132A Calibration Menu
The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. All of the calibration factors and security
settings are stored in non-volatile memory, and do not change when power
has been off or after a remote interface reset.
A calibration security code feature allows you to enter a security code
(electronic key) to prevent accidental or unauthorized calibrations of the
Counter. The security code is set to 53131 or 53132 (corresponding to the
model) when the Counter is shipped from the factory. If you forget your
security code, you can reset the security code to the model-number default
by resetting all of the non-volatile memory to a default state (Contact HP
for this confidential procedure).
NOTE This menu does not exist in early versions of the Counter. In the
early versions (firmware revisions 3317, 3335, and 3402) of the
HP 53131A/132A, the CAL: menu item resides in the Utility menu,
and there is no calibration security capability. See Chapter 6,
“Backdating,” in this guide for the correct calibration procedures.
Scale &
Offset
On / Stby
POWER