Keysight U3606B - Figure 1-18 SECUR Pads Location

1 Calibration Procedures
70 Keysight U3606B Service Guide
Figure 1-18 SECUR pads location
4 Apply power and turn on the instrument.
5 The display will show the message “CALib”. The instrument is now unsecured.
(The security code resets to the factory default value.)
6 Turn off the instrument and remove the power cord.
7 Remove the temporary short installed in step 3.
8 Reassemble the instrument.