136 Agilent U1251B/U1252B User’s and Service Guide
6 Performance Tests and Calibration
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.
The primary display shows 5555 and the secondary
display shows SECUr.
4 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.
5 Use the editing keys and to step each
character in the code.
6 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.
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 135.
Make sure you record the new security code.
If you do not have a record of the security code, you can try 1234 (the fac-
tory default code) using the front panel.
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