Instruction manual

Chapter 2 Service
The Agilent 53181A Calibration Procedures
Assembly-Level Service Guide 2-31
2
The Agilent 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.
2 Press 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.