04-09-2012 09:11 AM
Hi,
I am William, a student from Belgium (measurement and control techniques). For my thesis in June, I need to make a comparison between the USB 6008/6008 and the myDAQ-device. I should do this based on the specifications of the devices. The several specifications I have found in the user manuals are very interesting but I don't know what they mean. Can somebody explain me what " timing resolution", "in- and output resolution" and "direction control". Are there simple experiments with Labview to show the several difference between both DAQ devices?
with friendly regards,
William
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04-10-2012 05:02 AM
Hello William,
I'll start in the opposite order.
In the following document you already can find some more information:
http://sine.ni.com/ds/app/doc/p/id/ds-218/lang/en
Direction Control (for digital I/O) indicates in this case that your digital lines can be programmed to be an input or an output.
For more information about what analog input and analog ouput resolution means I would suggest you to have a look at the following document:
http://zone.ni.com/devzone/cda/tut/p/id/4439#2
It also contains a lot more information regarding specifications.
The timing resolution has to do with the timebase/base clock that is used to derive the sample clock.
Are these terms familiar to you?
04-10-2012 01:10 PM
Hi,
Thanks a lot for your answer ! I should defenitly integrate this information in my thesis. Are there experiments with labview that shows these difference ? I will specify my question with an example: is it possible to show with an experiment in labview the difference of the "timing resolution" between the myDAQ and the USB 6008/6009 device?
Thanks again,
William
04-10-2012 03:16 PM
I would suggest that you first learn the basics of A/D and D/A conversion. Once you have this information, several basic experiments should be pretty obvious.
04-11-2012 12:40 AM
04-11-2012 08:01 AM
Hello William,
I don't directly know of specific tests regarding time resolution comparison for these cards.
You're of course always free to do these tests yourself and share them with us. 🙂
04-11-2012 02:14 PM
Hi,
Thanks for the answer anyway 🙂 I'm trying to find out or there is a way to proove there is a difference between both DAQ-devices with labview
everybody thanks for your help ! I definitely let you know if I found something
friendly regards ,
William
04-11-2012 02:32 PM
A basic difference is in the analog input sample rates. What do you think you will see if you input a 1 kHz square wave to each, A 10kHz square wave to each, a 100kHz square wave to each? Are you familiar with Nyquist? Did your studies of measurements cover this at all?