Data acquistion on Mac using USB-6008

[mrwishart]

Hi,

I have been using the NI-USB 6008 to read in data from an electric photodetector. To do this I've put the 'DAQ Read' in a For Loop to read as many samples as possible. Problem is, the DAQ card has an acquistion rate of 10 Khz whereas my LabView program can only read in 200 samples a second. Is there any way of speeding this up?

I'm currently running Mac OS 10.5 and Labview 8.5

Thanks,

Paul Wishart

Message Edited by mrwishart on 03-20-2008 01:12 PM

[Prashant M]

Hi Paul,

I hope you are well.  I have had a look at your message and it is very interesting.  I was wondering if it would be possible for you to post your code on the forum so that I can have a closer look at the problem. 

Just to let you know, upon my initial investigation of the problem I would suggest that you should be able to increase the speed by clicking on the drop down menu on the DAQmx Read function in LabVIEW and selecting either single or multiple channel (depending on how you are using it) and then select the "multiple samples" option from this menu.  Once you have done this, double click on the DAQmx Read function and you should see a front panel.  On the top left of this front panel, you should be able to change the "number of samples per channel" to suit your purposes.

I have also seen some interesting links that you may find useful which can be seen below.

http://forums.ni.com/ni/board/message?board.id=250&message.id=7234&requireLogin=False

http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/5c9d0aefae8ea81486256dcf00788b2f?O...

http://forums.ni.com/ni/board/message?board.id=250&message.id=17312&requireLogin=False

Also, make sure that you do not have any other programs running when you run your code to maximize the performance of your computer.

I hope this helps you with your application and feel free to let me know how you get on.

Kind regards,

Prashant M
Applications Engineer
NI UK & Ireland