pgia

[navinavi]

Hello,

I am acquiring a signal using USB 6281, which comes with a programmable gain. I wanted to know how to modify the gain. I looked into DAQmx channel using which I can set AI Max and Min. Is the gain adjusted when I modify these values?

Thanks,

Navi

[Michael_78 · Accepted solution]

Yes it does. Set the min and max and daqmx will select the range for you. You can use a property node to read the range which has been selected.

[navinavi]

Thank you!

[Michael_78]

No problem (just in case you are very new, you can click Kudo to give thanks where an answer helps)
Pleased to help,
Michael.

[navinavi]

How exactly do I use/add the property node here? I was not able to add property node via the create option.

[Michael_78]

from the DAQMx Pallette drop a Channel node. then from the LabVIEW Help:

Analog Input:Maximum Value Property

Short Name: AI.Max

Property of DAQmx Channel

Specifies the maximum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced maximum value that the device can measure with the current settings.

So My first answer was a slightly incorrect.  I just tried this and sure enough if i set AI.Max to 3.2, then read AI.Max it reads 5.  As 5V is the smallest range my particular device can use to read 3.2V

I hope that helps,

Michael.