HP 8163A - Page 55

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Other Functions
Using the System Utilities
3 Enter the password, using the softkeys or the numerical keypad.
Press ENTER and the instrument unlocks.
NOTE The default password is 1234 .
To lock the instrument, perform the steps above, but in step 2 move
to the <LOCK> menu option in place of the <UNLOCK> menu
option.
Figure 2-5 Unlocking the Instrument