Accuracy of t0 from pxi4472

the pxi4472 spec indicates a 25ppm sampling frequency accuracy. i wonder how to translate this to the accuracy of the t0's of waveforms returned by each call to 'AI Read.vi'? or what's the accuracy of the pxi4472 controller clock that these t0's are dependent on?

Student,
That's a good question. DAQmx uses the windows timer to get the timestamp t0, and it tries to account for the exact time the first sample came in. The calculation goes something like this.
Lets say this is a finite read operation and all samples are read in 1 call to Read. t0 is calculated as
t0 = current system time when Read was called - (number of samples already acquired)* (sample rate)
I hope this makes things more clear!
Shea C
Applications
NI

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    Questions regarding Dynamic Access Control (FAQ)
    http://www.frickelsoft.net/blog/?p=293
    In addition, regarding dynamic access control, the following blog can also be referred to for more information.
    Dynamic Access Control in Windows Server 2012
    http://www.infoq.com/news/2012/10/Dynamic-Access-Control
    Please Note: Since the above two website are not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
    Best regards,
    Frank Shen

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