rfong,
If you want to measure the power of a pulsed signal, I recommend using an AM vs time plot such as the one we provide in Zero-span, and using the marker to measure the power during the on phase of the pulse. If you need to use the standard sweep measurement, consider increasing the RBW to improve amplitude accuracy. In general unless the pulse width is as long as the spectrum analyzers acquisition length for a given IF, the amplitude will be lowered, since the acquisition will include both on and off portions of the pulse period. For an FFT based receiver such as ours, this means the signal will not be present for the full FFT, reducing the reported amplitude.
Regards,
Andrew
