Agilent Technologies 6684A Benutzerhandbuch

Logic Probe

To check states of data lines.

Agilent 545A

Test Clips

To gain access to IC pins.

AP Products No. LTC

Ammeter/Current Shunt

To measure output current.

Agilent 6680A & 6681A:
Burster 1280
Agilent 6682A, 6683A & 6684A:
Guildline 9230/300

Oscilloscope

To check waveforms and signal levels.

Agilent 54504A

Signature Analyzer

To troubleshoot most of the primary

Agilent 5005A/B

and secondary interface circuits.

GPIB Controller

To communicate with power supply via
the GPIB (for system units).

Agilent BASIC series

DC Voltmeter

To measure output voltage and current,
bias and references.

Agilent 3458A

Description
The procedures in the troubleshooting charts make use of the power-on selftest. The power-on selftest tests the front panel,
GPIB interface (for GPIB system power supplies), and secondary interface circuits. If the power supply fails the selftest, the
output remains disabled (turned off) and the front panel normally displays an error code or message (see Table 3-2). The
message is displayed indefinitely and the power supply will not accept GPIB or front panel commands.

Disabling The Power-On Selftest
 In order to perform troubleshooting procedures that require programming of the power supply, you must disable the
power-on self test. Do this as follows:

1.  Turn off the power supply.
2.  Hold down the

 key and turn on the supply.

3.  Continue holding down the 

 for 2 seconds and wait until the PWR ON INIT indicator goes off.

4.  The power supply is now on without executing power-on selftest.

Using the *TST? Query (GPIB Systems Supplies Only)
You can get the power supply to execute a partial selftest by sending it the GPIB *TST? query command.  Table 3-2 shows
the tests that are performed in response to this command. These tests do not interfere with normal operation or cause the
output to change. The command returns a value of "0" if all tests pass. Otherwise, the command returns the error code of
the first test that failed. No error codes are displayed on the front panel and the power supply will attempt to continue
normal operation.