Agilent Technologies E4406A manual LAN External Loopback Test Failed - Error Message, Chapter

If You Have a Problem

Problem Symptoms and Solutions

Frequency Unlock or External Reference Missing - Error Messages

Symptom: A frequency unlock error message, or an external reference missing error message, appears in the annunciator bar just above the data window.

Solution 1: The red Ext Ref message indicates that the external reference is not locked. The external reference can be any frequency between 1 and 30 MHz. If you have connected an external reference you must enter it’s frequency into the instrument. The value you entered must correspond to the external reference that is in use, or it will generate the error. Note that the value entered for the external reference frequency will persist, even after the instrument has been powered off and then on.

A green Ext Ref message indicates that the instrument is using an external reference and it is properly locked.

Solution 2: If you want to use the internal reference signal, toggle the Freq Ref key to the Int (internal) setting.

LAN External Loopback Test Failed - Error Message

Symptom: During booting the instrument you see a message which reads LAN external loopback test failed.

Solution: This message indicates that no LAN cable is connected to the instrument. You can ignore this message if you don’t want to use the LAN.

Instrument Fails Alignment - Error Message

Symptom: An error message indicates that the instrument has failed alignment. This message appears either at power on during the self-alignment, or when the Align All Now key is pressed.

Solution: These alignments will fail if an external 50 MHz signal, at a power level greater than 0 dB, is connected to the RF input of the transmitter tester. Remove the 50 MHz signal to fix this problem.

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