Agilent Technologies 34970A, Service Manual, Page: 70 / 273

To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security code, follow
the steps below. A front panel procedure to unsecure the instrument
is given on page 51. See “Electrostatic Discharge (ESD) Precautions”
on page 162 before beginning this procedure.
W a r n i n g SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
The procedures in this section require that you connect the power
cord to the instrument with the covers removed. To avoid
electrical shock and personal injury, be careful not to touch the
power-line connections.
1
Disconnect the power cord and all input connections.
2
Remove the instrument cover (see page 174). Turn the instrument over.
3
Apply power and turn on the instrument.
Be careful not to touch the power line connections.
4
Apply a short between the two exposed metal pads marked
CAL UNLOCK as shown in the figure below.
5
While maintaining the short, enter any unsecure code.
The instrument is now unsecured.
6
Remove the short.
7
Turn off the instrument and remove the power cord. Reassemble the
instrument.
Now you can enter a new security code. Be sure to remember the new
security code.
W a r n i n g
•
Exposed Mains
•
Do Not Touch!
Apply Short
Chapter 4 Calibration Procedures
Calibration Security
68