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Urgent :- Inter modulation Products from SA Mixer Stage

Question asked by abishekm on Jan 24, 2012
Latest reply on Jan 26, 2012 by tabbott

     I am trying to measure SPURS (out of band )emitted from my DUT on E4407B. The DUT transmits at max 27dBm Power at 2.412 Ghz with BW 40Mhz.  I am trying to measure spurs from 30Mhz to 800Mhz. When I set my input Signal Attenuation  to 0 dB. I see spurs at 450 Mhz and 600 Mhz with Amplitude -45dBm and -39dBm. When I keep changing the input attenuation on SA from 0 dB to 15 dB i see the values still present but the Amplitude keeps changing ( not much ) . But with Attenuation = 20dB. Suddenly the 600Mhz Spur disappears ( the values is less that - 66dBm ). I am confused how to make sure that the Inter modulation Products of My Mixer and DUT signal's Don't show up on the Trace.

I would appreciate  for a quick reply,