Configuring individual channels on the PXI-4472B

[Wortel]

Hi, I am using the PXI-4472B card to acquire vibration data using transducers with different frequency ranges. The problem I am having is that some of the transducers require being powered from the board (via IEPE) and some don't and I cannot find a way to turn the excitation on and off for individual channels, only all of them.

I am using LabVIEW 8.6 and have configured all the channels using the property nodes to enable the excitation and specify the current, but not all the channels require this.

It clearly states in the data sheet for the 4472 card that the channels are individually configurable for the IEPE, can someone please tell me how to do this?

Thanks in advance,

Darren.

[ninlmartijn]

Hello Darren,

Thank you so much for your post on our webforum. I don't have this device on hand (at this moment), but did a test with a simulated device, and this worked well. I created two channels within one task; so use two create channel.vi after each other with their own channel properties. The task out and in are connected to each other, so they have the same task reference.

PLease find a picture of the test I did, based on example \Programs\examples\DAQmx\Analog In\Measure Sound Pressure.llb\Cont Acq Snd Pressure Samples-Int Clk.vi

Please let me know if you have any further questions,

best regards,

[pBerg · Accepted solution]

Howdy Darren,

Please see the following screenshot that illustrates how to set different IEPE values for different channels all in one task using DAQmx. The crucial item here is the ActiveChans property. Otherwise, as you know, KnowledgeBase 3GEF55NQ: How Do I Enable IEPE Excitation on My DSA Device in DAQmx? would have done the trick.

I hope this helps!

[Wortel]

That worked a treat,

Cheers!

[Wortel]

Hi pBerg,

The solution you provided worked great, however (as often happens) the system is starting to grow in size and now has 3x4472 cards, giving 24 channels. As this is a mobile "universal" system each channel needs to be able to be configured individually as i mentioned before.

Is it ok to have 24 of the property groups (the 3 different elements that need configuring)? Will this affect the performance? Is it best to group them into 3x8 for clarity?

I hope that makes sense...

Thanks in advance,

Darren.

Message Edited by Wortel on 11-13-2009 03:20 AM