AT-MIO-16L gain setting?

[Don and Cyndy Engdahl]

I've got Labview version 3.0.1 and the AT-MIO-l6L board. The board manual
says this is programmable in software for gains of 1, 10, 100, and 500.

I'm trying to do a simple-minded read of thermocouples, but cannot find a vi
that will allow a gain of 500 on analog input which is what I think I need.

HELP!

--don engdahl


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Engdahl web site:
http://cybermesa.com/~engdahl/

[srm@viewpointusa.com]

I only go back to 3.1 on my machine. But on 3.1 it works similar to the way it works today in that you specify the voltage range of the signal you want to acquire. So for your signal you would put in .02 to -.02 as the limits and LabVIEW will select the gain for you. If you dig into the AI VIs and look for AI Hardware Config.vi, leave it open while you run the routine, it will show you the actual settings used for the acquisition.
Stu

[John Lum]

Don,

Instead of explicitly specifying the gain, LabVIEW wants you to specify (as inputs to your VI) the high and low limits for the voltage input you expect (e.g. -0.0001 V and 0.012 V). The advantage with this approach is that it allows the driver software to use the maximum possible gain supported by the hardware for a given input situation, so that if you replace your 16L board with one with a different set of gain levels, your VI will still work properly.

For more information, search the NI site (KnowledgeBase and Discussion Forum are good places) using the following keywords:

gain "input limits"

Regards,
John Lum
National Instruments