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Chapter 5 181
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.