Performance Tests and Calibration 5
U1241B/U1242B User’s and Service Guide 47
Changing the Multimeter Calibration Security Code from the Front Panel
1 When the multimeter is in the unsecured mode, press button for
more than one second to enter Calibration Security Code setting mode.
2 The factory default calibration security code 1234 will be displayed on
primary display.
3 Press or to step each character in the code. Press
or to change the value of the selected character.
4 Press (Save) button, to store new calibration security code.
5 If the new calibration security code has been successfully stored, the
secondary display will show PASS. If the new code failed to save, the
multimeter will shows error code E07 on the secondary display for
approximately 3 seconds and return to the Calibration Security Code
setting mode.
Unsecuring the Multimeter Without the Security Code
1 Record the last 4 digit serial numbers of the multimeter.
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 SEC.
4 Press for more than one second to enter Set Default Security
Code mode. The secondary display shows SEr and primary display
shows “5555”.
5 Press or to step each character in the code. Press
and to change the value of the selected character.
6 Set the code, same as the last 4 digit serial number of the multimeter.
Press
(Save) to confirm the entry.
7 If the 4 digit serial number entered is correct, the secondary display
will show PAS. If an invalid code is entered, the multimeter will show
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