Performance Tests and Calibration 7
Agilent U1251A/U1252A User’s and Service Guide 141
To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security
code, follow the steps below.
1 Record the last 4 digit serial numbers of the instrument.
2. Turn the rotary switch to .
3. Press and button simultaneously to enter
the Calibration Security Code entry mode.
4. The primary display shows 5555 and the secondary dis-
play shows SECUr.
5. Press button for more than 1 second to enter Set
Default Security Code mode. The secondary display shows
SEr.no and primary display shows 5555.
6. Use the editing keys and to step each char-
acter in the code.
Use the and to select each character.
7. Set the code, same as last 4 digit serial number of the
instrument.
8. Press (Save) button, to confirm the entry.
9. If the correct 4 digit serial number was entered, the
secondary display briefly show PASS.
NOTE
If you do not have a record of the security code, first try 1234 (the factory
default code) through front panel or remote interface.
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