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PSA Spectrum Emission Mask Limit Test is Strange

Question asked by JONESA on Jul 5, 2009
Latest reply on Aug 12, 2009 by JONESA
I'm trying to use the PSA Spectrum Emission Mask measurement function to make measurements in line with ESTI standards for fixed radio systems. These measurements are based on applying the limit mask relative to PSD measurement at the centre of the channel. On the PSA I use the SEM measurement type "PSD Ref, dBm/Hz" with the PSD ref being automatically updated for each sweep. As far as I can tell it seems that the plotted display is not a PSD plot and therefore does not apply the limit test correctly. It also appears that the plotted relative limit line is always displayed in reference to the total power reference resulting in the limit line being much higher above the plotted measurement.

I am hopeful someone can help me as this measurement is very useful convenient to have in such an instrument.