Agilent Technologies 6628A, 6626A, 6625A, 6629A manual Checking Out Your Supply Using Local Control

Figure 3-4. Typical Display at Power-On

Self-Test Errors

If the supply fails the power-on self-test, all power supply outputs will remain disabled (off) and the display will indicate the type of failure and the output channel on which it occurred. Figure 3-5 shows that self-test detected an error in output channel 3. Error messages that could appear on the display if self-test fails are listed below. Self-test error messages are explained in Appendix D and troubleshooting procedures are given in the Service Manual. You may also call your Agilent Sales Office for help.

Power-On Self Test Error Messages

HDW ERR CH "N" 8291 FAILED TIMER FAILED CV DAC CH ’’N"

CCDAC CH "N" OV DAC CH "N" FUSE CH ’’N"

Note: "N" specifies the failed output channel number: 1,2,3, or 4 as applicable.

Figure 3-5. Sample Self-Test Failure Display

Checking Out Your Supply Using Local Control

The following procedures use the display and keys on the front panel to check each of your power supply’s outputs. No test equipment, other than a jumper wire (14 AWG), is required to perform these tests. The tests must be repeated for each output of your particular supply. The checkout consists of voltage, overvoltage, and current tests. It is assumed that power has already been turned on, the supply has passed the power-on self-test, loads are not connected to any of the supply’s outputs, and sense clips are connected between the sense terminals and the output terminals.

Note	The following procedures are identical for all models and for all outputs. Use the OUTPUT SELECT key
	to select an output to be tested. If an output fails any of the tests, refer to the troubleshooting section in
	the Service Manual.

Getting Started 37