Measurement with DAQmx

[Jaiminho]

Hello:
I'm measuring signals of accelerometers in a 9234 module, using DAQmx (I leave the block diagram attached), which will be part of a software that will include other stages. When the acquisition is stopped by pressing "stop", I measure with a voltmeter between terminals BNC connector, reading 21 volts, which is the excitation to the sensor. My question is: how I can do to cut the excitation to sensors once the samples are acquired?

Best regards

Jaime

[Chad_A · Accepted solution]

Hi Jaime,

You can disable the 9324's excitation output by setting the AI.Excitation.Value property to 0.0 (see the following KB: http://digital.ni.com/public.nsf/allkb/3AD6CCE935192B4086256F6B0079CB1F).

Then, once you've set the attribute, you'll need to commit the task to actually push that setting to hardware (normally DAQmx will automatically commit when you start the task, but in this case, we don't want to start the task).  Between your DAQmx Stop Task VI and your DAQmx Clear Task VI, you should add the following:

• DAQmx Channel Property Node to set AI.Excit.Val=0.0
• DAQmx Control Task.vi to commit your new task settings

[Jaiminho]

Hi Chad_A.

It was easier than I could imagine.
Thanks

Best Regards

Jaime