Chapter 2 Service

The HP 53131A/132A Calibration Procedures

The HP 53131A/132A Calibration Procedures

First Determine the Counter Firmware Revision

Press and hold Recall (Utility) key, then cycle POWER key.

 

REV: n is displayed; where “n” represents the numeric firmware revision

 

code.

 

If 3317, 3335, or 3402 is displayed as the firmware revision code, then

 

perform the calibration procedures in Chapter 6, “Backdating.”

 

If the Counter’s firmware revision code is higher than the ones in the

 

previous paragraph, then perform the following procedures in this section.

 

 

NOTE

After completing the instrument calibration, BE SURE to secure the

 

calibration by performing the procedure in the section titled “To Secure

 

Against Calibration” on page 2-13 of this chapter.

 

 

To Calibrate the Offset for Channels 1 and 2

1To access the Calibration menu, power down, and press and hold the Scale & Offset key, then press POWER key.

The first item in the Calibration menu is a message indicating the calibration security status: CAL SECURE or CAL UNSECURE.

The Counter calibration must be unsecured to perform calibration.

If CAL UNSECURE is displayed, the Counter is already unsecured for calibration; go to step 5. However, if CAL SECURE is displayed then perform steps 2 through 4 to unsecure calibration.

2Press Scale & Offset key until CODE: 0 is displayed.

2

Assembly-Level Service Guide

2-15

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HP 181A manual HP 53131A/132A Calibration Procedures, First Determine the Counter Firmware Revision