Code DAQ Express reports difficult DT

All,

I have a strange problem where some code DAQ Express reports systematically bad DT. This occurs with peripheral equipment and a simulated device. I've attached screenshots detailing everything that I found relevant to the problem as well as the source code.

You can download the files here.

http://sites.Google.com/site/xkenneth/downloads

Kind regards

Ken

Hi Ken,

Please post on the Forums of Discussion OR! Your photos, I see you use a NOR-9239. On page 16 of the NOR-9239 Operating Instruction and specifications, he explains that the valid sampling rates from the time base by dividing this value by 256. Then, the value can be divided down by an integer between 1-31. Thus, valid high sampling frequency may be as high as 50 kech. / s up to 1,613 kech. / s when using the 12.8 MHz internal time base.

In your case, you specify a sampling frequency of 300 s/s, which is much less than the lowest possible rate of 1,613 kech. / s. Therefore, the Board of Directors is forcing this value up to 1,613 kech. / s and the reverse of this is the value of dt you see, which is 0,00062 seconds. To get real sampling rate less than this value, you will need to provide an external clock. For example, to achieve a 300 s/s clock frequency, you must provide an external clock to a multiple integer of 76.8 kHz (up to 2,3808 MHz).

Also, thank you for adding attachments to your message. This gives other users a easier access to information for both provide support and also to be able to view all relevant information during the exploration of the post in the future (in case where someone else runs into the same type of problem). Anyway, thanks again for the post and all the details of your problem! See you soon,.

Tags: NI Software

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