Should transducer observe" Nyquist rule" in DATA ACQUISITION?

[LV_Pro]

I guess what we should have asked is, what is the output of the transducer? If it is an analog output, then you need to look at the spec sheet and see how the 100KHz limit is defined, ideally with a graph showing the rolloff. If its 3dB point (where its output is 3dB down from the "normal" linear range) you need to know where it begins to roll off as some devices roll off sharply (which might allow accurate measurements at 90KHZ) others less so, so that you may be down 1.5dB at 90KHz, which, depending on your requirements, might be too much. As mentioned in the previous two posts the Nyquist "rule" applies to the sampled data, not the analog input, but as also mentioned there it is desirable to have your measurement equipment have some head room in accuracy, particularly in somewhat vague specifications like frequency response/rolloff. Should you go to a transducer with a higher frequency response, yes, can you use the one you have, possibly. Does Nyquist factor in regarding the transducer, no, but as another post mentions, the DAQ had better have a sampling rate at least twice the expected highest frequency component, including any resonances that might occur, even if you aren't interested in them, otherwise you will need to also do some low pass filtering to prevent them from being aliased into your desired rnage of interest.

P.M.