Rif.: sampling rate not respect with 9401

[fabio.int]

Hello,

I have an cDAQ 9178 with the 9401 on slot 2 and 9205 on slot 6.

I want to acquire the counter CTR1 synchronized with the AI clock of the 9205. To do that I use the DAQmx Timing and the DAQmx Read.

But, if I set 1000 S/s and 40S, I don't receive the Samples and the number of available samples increase until I received an error.

If I set 1000S/s and 2x40S=80S it works properly.

Why?

[Stefano.Caiola]

You are acquiring 1000 s/S/ch with a period of your app of about 36 mS and acquiring 40 S. You are executing everything on windows. Are you sure that your app can keep up with the pace?

Try to look at the loop cycle and decrease it. Acquiring 80 samples enables you to be sure that the buffer stays empty.

Regards.