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I'm trying to calculate measurement accuracy for a spectrum analyzer noise measurement. I have a conditioning circuit with some filtering and switchable dither noise. My test calls for verifying that output noise with the input terminated and dither noise turned off is less than 5 dB above the instrument noise floor. This maybe should have

Hello, I'm trying to communicate to a E4407B analyzer via USB GPIB 82357B.  I open the Agilent Connection Expert, after i plug in  USB GPIB 82357B, and after i plug in the E4407B analyzer.   The Connection Expert do verify and find several instruments. The E4407B have GPIB address 18. When i send the *IDN? command, i get