I want to ask the question about phasor measurement.

I want to ask the question about phasor measurement.the first one is that how can I accomplish the sychronized sampling with GPS?The other question is that how can I adjust the sampling rate for DAQ when the system frequency alter continuously.(if I used the DFT,due to the altering of frequency,I can't get the completed waveform)"

Synchronising DAQ with GPS depends on the DAQ sampling rate. If the rate is higher than 2 Hz you can sample the 1PPS pulse of your GPS receiver together with your data.
You change the sampling rate with the AI Clock Config.vi. You cannot do this on the fly so you must stop DAQ with AI Control.vi reconfigure the sampling rate and then start it again.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

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