7 Performance Tests and Calibration
Unsecuring the instrument for calibration
Before you can adjust the instrument, you must unsecure it by entering the correct security code. The security code is set to 1234 when the instrument is shipped from the factory. The security code is stored in non- volatile memory, and does not change when power is off.
To Unsecure the Instrument from the Front Panel
4Turn the rotary switch to 
.
5Press 
and 
button simultaneously to enter the Calibration Security Code entry mode.
6The primary display shows 5555 and the secondary display show SECUr.
7Use the editing keys 
and 
to step each character in the code.
Use the 
and 
to select each character.
8Press 
(Save) when done.
9If the correct security code is entered, the secondary display will show PASS.
128 | Agilent U1251A/U1252A User’s and Service Guide |
