TROUBLESHOOTING

TROUBLESHOOTING

TABLES

Table 5-5.Error Messages 100, 101, and 102

Internal DVM Tests

Error 100 DVM Ground Offset Failed, or

Error 101 DVM Positive 10V Reference, or

Error 102 DVM Negative 10V Reference

Description: The DVM circuitry, located on the A16 CPU Interface PCB, is calibrated using the ￿10 volts from the reference supplies on the A12 Analog Instruction PCB. The error messages indicate a calibration-related problem or a defective ￿10 volt reference.

Step 1. Perform a manual pre-calibration. (Refer to chapter 4 for the calibration procedure.)

Step 2. Run self-test.

qIf no error message is displayed, the problem is cleared.

If any of the error messages, 100, 101, and 102, are dis- played, go to step 3.

Step 3. Connect the negative lead of the DMM to A12TP1.

Step 4. Measure the ￿10V reference voltages at A12TP4 and A12TP8. A12TP4 should be –10V ￿0.036V; A12TP8 should be +10V ￿0.036V.

qIf the ￿10V reference voltages are correct, go to step 5. If incorrect, replace the A12 PCB.

NOTE

Even if the ￿10V reference voltages are correct, there could still be a malfunction of the DVM multiplexer on the A12 PCB or the DVM circuitry on the A16 CPU Interface PCB.

Step 5. Replace the A12 PCB and run self-test again.

qIf no error message is displayed, the problem is cleared.

If any of the error messages, 100, 101, and 102, are dis- played, go to step 6.

Step 6. Replace the A16 PCB, then run self-test.

qIf no error message is displayed, the problem is cleared.

If any of the error messages, 100, 101, and 102, are dis- played, contact your local ANRITSU service center for assistance.

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682XXB/683XXB MM

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Anritsu 682XXB, 683XXB manual Internal DVM Tests

682XXB, 683XXB specifications

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