I'm trying to perform single voltage value ejection in a loop with NI-4461 PCI-card.It seems to me that the straightforward way to this is to set the output buffer size to 1 and make the card wait for my program to generate the next value. But it turned out that while this works, the buffer size has great impact on the performance: if I set the sample rate to 204800 and small buffer size (2 Samples) one of the kernels of my CPU is loaded at almost 100%, when the buffer size is 200 the processor load is near zero most of the time except periodical bursts (every 80-90 seconds). I would like to know what is going on and what is the proper way to rerform the task.

If you set the buffer size to 2, only the 2 samples you wrote are repeated until you overwrite those values. Just take the measurement with your 4461. For exact information about the 4461 analog output, e.g. filter delay refer to the NI Dynamic Signal Acquisition User Manual, p. 2-12 ff. Regards, Message Edited by AndreasS on 11-16-2009 10:27 AM

Multifunction DAQ

1 sample at a time with NI-4461

Solved!

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Thanl you very much. I think that my problem is solved.

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Multifunction DAQ

1 sample at a time with NI-4461

Re: 1 sample at a time with NI-4461