How can I set a delay between the measuremen​t of different channels..​.?
Hello everyone,
I am using Labview 8.0, and a PCI 6221 card. (windows XP).
I am using the 8 AI of the card to measure 8 Voltages (diff. mode).
The problem I have is that I get an offset except on the first channel I measure. If I set the DAQ assistant like this : AI0;AI1;AI1. This is what I measure : 0.320V;0.1695V;0.168V
I only get the offset with the first AI1 and not the second AI1 (0.168 is the correct value). I suppose the multiplexer hasn't got the time to change impedance when changing from AI0 to AI1.
I have attached a simplified version of my program where I am measuring 3 channels, and generating a square wave analog output.
My idea is to introduce a delay between the change of channels.... Is that a good idea...? and I am sure there is a very simple way to do this based on my program, but I don't know how. How long should the delay be? Or any other idea...?
Thanks for your help,
Marc
Attachments:
forum.vi 71 KB
If I choose just one channel ( AI0, AI, AI2,....or AI7) I have no offset. The offset only occurs when I set more than one channel to be measured ( but the first channel in the order of reading is always fine what ever it is). I have explained my problem in a previous post :
http://forums.ni.com/ni/board/message?board.id=170&message.id=257677&query.id=32291#M257677
I have some noise on my measures (roughly +/5 mV), so for the moment I am taking 1000 samples every 1ms on each channel and making an average of the 1000 samples.
I will try your solution : taking a look at the first points of my measures to see if the offset goes away quickly or not. However since I have been making an average on 1000 points at 1Khz, if I get a 2mV offset (after making the average), it means there are many points conerned by the offset.... I will see that anyway when looking at the 1000pts.
I don't have much experince in this, but I am surprised I have to deal with this kind of multiplex problem on a NI card. What do you think about it...? Does it surprise you...? What could I be doing wrong ?
Thanks a lot for your help anyway
Marc
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