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HP 8504B problem

Question asked by allan on Feb 18, 2016

Hi I have a problem with an HP 8504B reflectometer that seems to hang up and not perform a sweep.  The instrument is on continuous sweep, averaging is turned off but I get the asterisk on the top left indicating “measurements parameters changed: measured data is in doubt…”.  Pressed the preset but still there’s no scan and I get the prompt “waiting for complete sweep” and it just stays there.  I realize this is a very old instrument but I was wondering if anyone has come across this or has any suggestions?  Thanks...