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Chapter 4 Calibration Procedures
Calibration Security
4
4
To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security code, follow the
steps below. See “To Unsecure and Secure for Calibration” on page 41.
See “Electrostatic Discharge (ESD) Precautions” on page 133 before
beginning this procedure.
1 Disconnect the power cord and all input connections.
2 Remove the instrument cover. See “Disassembly” on page 140.
3 Remove the main power supply.
4 Apply a temporary short between the two exposed metal pads on the
A1 assembly. The general location is shown in the figure below. On the
PC board, the pads are marked CAL ORIDE.
5 Apply power and turn on the instrument.
WARNING Be careful not to touch the power line connections or high voltages on the
power supply module.
6 The display will show the message “Calibration security has been
disabled”. The instrument is now unsecured.
7 Turn off the instrument and remove the power cord.
8 Reassemble the instrument.
Now you can enter a new security code, see “To Unsecure and Secure for
Calibration”, on page 41. Be sure you record the new security code.
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