Calibration Procedures 3
Keysight 34420A Service Guide 93
5 While maintaining the short, enter any unsecure code. The meter is now
unsecured.
6 Remove the short at JM500.
7 Turn off the meter and remove the power cord. Reassemble the meter.
8 The meter is now unsecured and you can enter a new security code. Be sure
you take note of the new security code.