Keysight E3631A, Service Manual

Page: 78 / 131

3 Calibration Procedures
76 Keysight E3631A Service Guide
To unsecure the power supply for calibration
The power supply can use a calibration security code to prevent unauthorized or
accidental calibration. This procedure shows you how to unsecure the power
supply for calibration from the front panel.
1 Turn on the front-panel calibration mode.
Turn on the calibration mode by pressing the "Calibrate" key while
simultaneously turning on the power supply then continue to hold the
"Calibrate" key for about 5 seconds until a beep is heard.
If the power supply is secured, you will see the above message from the front
panel for approximately one second. The "CAL MODE'' message is then
displayed on the front panel.
2 Move to the security code by pressing the "Secure" key.
3 Enter the security code using the knob and resolution selection keys.
The security code is set to "HP003631" when the power supply is shipped from
the factory. The security code is stored in non-volatile memory and does not
change when the power has been off or after a remote interface reset.
To enter the security code from the front panel, enter only the last six digits. To
enter the security code from the remote interface, you may enter up to 12
characters.
Use the resolution selection keys to move left or right between digits. Use the
knob to change the digits. Notice that the security code may be different if the
security code has been changed from the default setting.
4 Unsecure the power supply.