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on Jan 12, 2012
on Jan 12, 2012 by daras
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How do one measure intermodulation using Agilent 8722ED network analyzer
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Jan 12, 2012 4:58 PM
with much difficulty.
Sorry for the flip answer, but I couldn't resist. In any case, with the 872x (or any of the older VNAs) there is no built-in application for measuring intermodulation products. you would have to build up a system (hardware and software) to do that. first of all you need at least one additional source and an external combining network to create the two tones for your test, using the 872x's source as one of the tones. sources in the older analyzers where not designed to have particularly good harmonics or isolation, so you might have to use filters and isolation amps in the combining network. if this is going to be a single center frequency IMD measurement, then you could setup the measurement receiver on the 872x manually in a segment sweep in frequency offset mode so that each one point segment measures one of the products or one of the output tones. there are a lot of details that you'll have to be concerned about and too much to get into in a forum post, but if you refer to this
for setting up a manual IMD measurement on an older style PNA, you can translate most of the concepts to the 872x.
however, if you want life to be simple and sweet, you can use a PNA-X with option 087 IMD applications that does all the work for you. You can go this
for more info on option 087 and PNA-X
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