142 Agilent U1251A/U1252A User’s and Service Guide
7 Performance Tests and Calibration
Now you can use 1234 as the security code. If you want to 
enter a new security code, see “To Change the Instrument 
Calibration Security Code from the Front Panel” on 
page 140. Make sure you record the new security code. 
Calibration Process 
To complete a full instrument calibration use following 
general procedures:
1 Read  “Test Considerations” on page 128. 
2 Perform the verification tests to characterize the 
instrument (incoming data). 
3 Unsecure the instrument for calibration (see “Calibration 
Security” on page 138). 
4 Perform the adjustment procedures (see “Adjustments 
Consideration” on page 144). 
5 Secure the instrument against calibration. 
6 Note the new security code and calibration count in the 
instrument's maintenance records.
Make sure to quit the Adjustment Mode before turning off the instrument.