sample rate?

[shen]

I run the sample program "ai_samp.prj" in the path "easyio".
I set the smaple rate to 1000Hz,but the acutal smaple rate shows 400Hz.I
want to know why.

[Spencer S.]

Shen,

This question is answered HERE.

Good luck with your application.

Spencer S.

[shen]

Spencer S,
Thank you.
I want to sample data and show it on the screen at the same time
continuously .How can i do? Are there any examples? I'm a beginner.

Shen

[Spencer S.]

Shen,

Absolutely. If you want to continue using the Easy I/O functions, the ai_async.prj example both continuously acquires and graphs.

Spencer S.

[shen]

Thank you.But ai_async.prj is an asynchronous one.
If I need a synchronous one to achieve high sample rate, do I need extra
hardware in windows2000?

[Spencer S.]

Synchronous Vs. Asynchronous is a "concern" when dealing with finite operations, not continuous as you have indicated you want to perform. With regards to speed, I would suggest that you create your application based on the DAQdoubleBuf.PRJ example available in the following location:

C:\Program Files\National Instruments\MeasurementStudio\CVI\samples\daq\Ai

This example does not have a user interface, but I have attached an example I created sometime back that acquires continuously from multiple channels and displays the data on a user interface.

Good luck.

Spencer S.