External Tests Failure Troubleshooting; To Execute The External Test; The Contents Of The External Test - Agilent Technologies E4991A Service Manual

External Tests Failure Troubleshooting

If you can't identify the faulty assembly using the internal tests, you can execute the
external tests in addition to the internal tests. These external tests are also built-in tests and
9 tests are available in the E4991A diagnostic test mode. Refer to Table 4-2 to know which
assembly is probably faulty and should be replaced.

To Execute the External Test

To execute the external tests, perform the following procedures. This procedure should be
done with the mouse and the external keyboard.
Step 1. Connect the mouse and the external keyboard to rear panel, and then turn on E4991A.
Step 2. Click System Menu on the menu bar.
Step 3. Click in the System menu.
Diagnostic
Step 4. Double-Click
External Test
opened.
Step 5. Click the button of the each test to execute the specified test.
Step 6. Perform each test according to the instruction.

The contents of the external test

The external test contains the following tests.
• Front Keyboard & LCD Display
• Source
• Out ATT
• Input ATT
• IF Gain
• Front Isolation
• Test Head
• DC Bias
• Z Meas
Chapter 4
External Tests Failure Troubleshooting
in the Diagnostic menu. Then the External Test dialog box is
Troubleshooting
189