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PSA E4446A spurious artifacts

Question asked by timbo on May 16, 2012
Latest reply on May 31, 2012 by xmo
Using  an E4446A spectrum analyzer I was seeing spurious images caused by an large input signal.
I'm not using exact numbers intentionally, but they are close.

Input was +14 dBm with 0 dB atten internal.
Fin was 2.5 GHz
Span was 300MHz to 1 GHz and I believe the RWB was at 1MHz.
The observed spurious result was significantly above the noise floor at aprox 0.5 Ghz. 

I know the mixer level at Fin was higher than it should be but (s/b -10dBm max) but I thought the preselector would prevent spurs when moved off the high level input.. in this case quite alot.

I later injected my own signal with a calibrated sig gen and obtained the same result. I know it was a spurious artifact because adding 10 dB atten caused it to vanish completely..by much more than 10 dB.

So.. am I doing something wrong? Should I have to manually adjust the YTF or does it auto adjust at each sweep?

Edited by: Timbo on May 16, 2012 2:10 PM Correction.. intially had 0 dB attenuation

Edited by: Timbo on May 16, 2012 2:11 PM  

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