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 digits of the multimeter’s serial number.
2. Turn the rotary switch to .
3. Press and simultaneously to enter the
Calibration Security Code entry mode.
4. The primary display shows 5555 and the secondary dis-
play shows SECUr.
5. Press for more than 1 second to enter the Set
Default Security Code mode. The secondary display shows
SEr.no and the primary display shows 5555.
6. Use the editing keys and to step each char-
acter in the code.
Use and to select each character.
7. Set the code, same as the last 4 digits of the instrument’s
serial number.
8. Press (Save) to confirm the entry.
9. If the 4 digits entered are correct, the secondary display
will show PASS.
If you do not have a record of the security code, you can try 1234 (the fac-
tory default code) using the front panel or the remote interface.
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