Chapter 3 Calibration Procedures
Calibration Security Code
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3
4 Unsecure the power supply.
The power supply is unsecured when you press (Secure) key. You wi ll
see the above message from the front panel for one second. The ‘‘CAL MODE’’
message is displayed on the front panel after above message.
5 Turn off the calibration mode.
Turn off the power supply to exit the calibration mode.
To Unsecure the Power Supply Without the Security Code
To unsecure the power supply without the correct security code (when you
forget the security code), follow the steps below. See ‘‘Electrost atic Discharge
(ESD) Precautions’’ in chapter 5 before beginning this procedure.
1
Disconnect the power cord and all load connections from the power supply.
2
Rem ove the instrument cover. Refer to the disassembly drawing on page 127.
3
Connect the power cord and turn on the calibration mode by holding down
(Calibrate) key as you turn on the power supply and
hold down
the key
until you hear a long beep. Be careful not to touch the power line connections.
4
Apply a short be tween the two exposed metal pads on JP5 (located near U13).
The JP5 is outlined with a circle on the component locator drawing on page 128.
5
While maintaining the short, move to the security code and enter any unsecure
code in the calibration mode. The power supply is now unsecured.
6
Rem ove the short at JP5. (An error occurs if not removed.)
7
Turn off and reassemble the power supply.
Now you can enter a new security code. Be sure you take note of the new
secu rity code .
UNSECURED
To re-secure the power supply (following calibration), perform this
proce dur e again .
I/O
Secure
Config
I/O
Secure
Config
Power
Error
Calibrate
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