HP 181A manual To Secure Against Calibration, To Change to a New Security Code

Chapter 2 Service

About the HP 53131A/132A Calibration Menu

To Secure Against Calibration

1Press and hold Scale & Offset key, then cycle POWER key.

CAL UNSECURE is displayed. If CAL SECURE is displayed, then the Counter is already secured against calibration and the remaining steps are not applicable.

2Press Scale & Offset key until CODE: is displayed.

3Press the appropriate arrow keys to enter the security code, then press Enter key.

CAL SECURE is displayed.

To Change to a New Security Code

1Press and hold Scale & Offset key, then cycle POWER key.

2Unsecure for calibration by the using the procedure described in the section titled “To Unsecure for Calibration.”

3Press Scale & Offset key until CODE: is displayed.

4Press the appropriate arrow keys to enter the new or customized security code, then press Enter key.

A scrolling message will appear, indicating what the new code is.

For example, the Counter displays the NEW CODE IS 5 if you entered “5” as the new code.

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Assembly-Level Service Guide 2-13