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pna-x cal all imdx waveform spiky

Question asked by rok on Jul 31, 2013
Latest reply on Feb 5, 2014 by jvall
Hi,

I'm running the N5244A PNA-X firmware A.09.90.01. I am trying the 'Cal All' function for gain, swept im3, and noise figure for converters for my downconverter. While I am getting good results for the gain and noise figure, I'm getting spiky behavior in the swept imdx measurement, as shown in the attachment (and circled in red).  When I perform the calibration individually, the spikes disappear and I get a nice straight waveform across the band. So I'm not sure why there is such a difference in behavior.

For my  cal all settings, I am using for Port 1: -18dBm Source attenuator of 10dB, Port 2 : -10dBm  source attenuator of 0dB and Receiver attenuator of 30dB. For the IMDX measurement channel in question, it has those same settings.

Let me know whether it's a software issue, or if there something I can do to fix it on my side when using the 'Cal All' feature.

Thanks,
rok

Edited by: rok on Jul 31, 2013 5:07 PM  

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