Data acquisition memory NOR

Hi all that I use NI DAQ 9188 and I have integrated the NI 9205 module to it.

In the NI 9205 data sheet, it is written that he has 250 k s/s ( http://www.ni.com/datasheet/pdf/en/ds-190 )

It is written in the data of NI 9188 sheet that it has 127 samples / slot ( http://www.ni.com/pdf/manuals/370086a.pdf )

(1) so, what is the difference between these two samples?

(2) where will be the memory of data. That is to say where the samples is recorded through which we read it by LabView software

Thank you

-Naga

A few details:

When acquiring, DAQmx will automatically transfer data from your device (in this case 9205/9188) in memory on your computer.  As long as there is room in this buffer, daqmx will transfer data.  When you call DAQmx Read, it will return that stamp on your computer data.  The size of this buffer can be set or queried via the Buffer DAQmx-> Input.BufSize property property node.  You must configure your LabVIEW application to read from this buffer before it fills up.  I make this distinction because it means have you strictly need a loop that reads 127 samples each 0.0005 seconds.  You can read a lot less often if you read larger blocks of data.  Simply ensure that you are pulling the data from the buffer as fast hardware is producing data (for the 9205, it tops out at 250 ksps / s).

I hope this helps,

Dan

Tags: NI Hardware

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