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Chapter 2 Service
The HP 53181A Calibration Procedures
Assembly-Level Service Guide 2-31
2
The HP 53181A 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.
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 2-29 of this chapter.
To Calibrate the Offset for Channel 1
1 To 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.
3 Press the appropriate arrow keys to enter the security code
“
53181
”, for example, if 53181 is the security code by performing
the following steps:
a. Press key four times.
The Counter should display
CODE: 00000
.
b. Press key five times.
The Counter should display
CODE: 50000
.