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NI PXI6682 sychronization with daqmx

Hello,

 

I try to use GPS from PXI6682 to provide the clock for DAQmx device. And I want to get the exact time when data acquisition beginning. I have done my program. But I found there is time difference of 30s-50s between the acquisition time and another PC time which is synchronized with GPS. Can any one give some hints about this issue? My VI is attached.

 

Thanks

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