6 Performance Tests and Calibration
162 Keysight U1251B and U1252B User’s and Service Guide
To change the instrument calibration security code from the front panel
1 When the multimeter is in the unsecured mode, press for more than
1 second to enter the Calibration Security Code setting mode.
2 The factory default calibration security code 1234 will be displayed on the
primary display.
3 Use the editing keys and to step each character in the code.
4 Use the and to change each character in the code.
5 Press (Save) to store the new calibration security code.
6 If the new calibration security code has been successfully stored, the
secondary display will show PASS.
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.
NOTE
If you do not have a record of the security code, you can try 1234 (the factory
default code) using the front panel.
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