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N5181A Low Level, low freq. issue

Question asked by Sterling019 on Feb 8, 2011
Latest reply on Feb 8, 2011 by tabbott
I have several N5181A's that do not perform well at frequencies below 250kHz and at levels below -100dBm.  This problem Only happens when the GPIB cable is connected.  The level increases 1-2 dBm at the lower frequencies and low power levels as if I have some sort of ground loop with in GPIB. I have tried 3-4 MXG's that work fine and several that have this issue.  I have also tried several GPIB cables, several different workstations and several PSA's to monitor the outputs of the N5181A's.  Are there any known GPIB grounding loop issues with the N5181A's???