Troubleshooting - 3
Post-repair Calibration
Calibration is required annually and whenever certain components are replaced. If components in any of the circuits listed below are replaced, the supply must be
a.A1 Control Board: Voltage or Current Monitor Amplifier circuits, High Bandwidth Current Amplifier, or Current Monitor resistors R403/R473
b.A2 Interface Board
If the Interface board A2 is replaced, the supply must be initialized first (see "Initialization" later in this chapter) and then be calibrated.
Inhibit Calibration Switch
If "CAL DENIED" appears on the display when calibration is attempted, or if error code 401 occurs when calibrating over the GPIB, the internal INHIBIT CAL switch has been set. This switch setting prevents unauthorized or inadvertent power supply calibration. You must reset this switch in order to calibrate the supply.
This
4 3 2 1
ON
S201
| Switch 3 | Switch 4 |
Normal | Off | Off |
Clear | Off | On |
Password |
|
|
Inhibit | On | Off |
Calibration |
|
|
Calibration Password
In order to enter the calibration mode, you must use the correct password as described in Appendix B of the Operating Manual. As shipped from the factory, the number 0 (zero) is the password. If you use an incorrect password, "OUT OF RANGE" will appear on the display for front panel calibration (or error code 402 occurs for GPIB calibration) and the calibration mode will not be enabled.
If you have changed the password and have forgotten it, you can set the configuration switch on A2 Interface board to bypass the password. See "Calibration Switch" paragraph above.
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