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Multiple 8594E models failing Noise Sideband test

Question asked by AOG on Jan 26, 2016
Latest reply on Feb 3, 2016 by dhamilton
I have several 8594E analyzers failing the Noise Sideband test at 500MHz with 30kHz offsets.  The specification is -75dBc.  The units are typically measuring around -74.7dBc.  I have tried the E8257D-UNX, E4438C-UNJ, 9640A-LPNX, and a host of other generators.  Out of about 20 units, at least 8 have failed this test.  Has there been any specification changes?  I have tested them at different locations and different benches but they still fail.  What should I look for next?