HP 53131A - To View the Calibration Menu and Security Status

Chapter 2 Service
About the HP 53181A Calibration Menu
2-28 Assembly-Level Service Guide
2
To View the Calibration Menu and Security Status
The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. The first item in the Calibration menu is a
message indicating the calibration security status:
CAL SECURE or
CAL UNSECURE .
To Unsecure for Calibration
1 Press and hold Scale & Offset key, then cycle POWER key.
CAL SECURE is displayed.
If
CAL UNSECURE is displayed, then the Counter is already unsecured
for calibration, and the remaining steps are not applicable.
2Press Scale & Offset key until
CODE: is displayed.
3 Press the appropriate arrow keys to enter the security code “
53181 ”,
for example, if 53181 was the security code set at the factory.
4Press Enter key.
CAL UNSECURE is displayed.
NOTE If “53181” was NOT the correct security code, the Counter would have
displayed BAD CODE.