Using MIO-16XE-10, I am trying to relate per gain setting the resultant actual voltage range.

[billb]

I have tried to find the conversion table for gain setting and resultant voltage. I am a programmer, and am having trouble understanding the relationship, or better yet, an algorithm, so I can programmably set a gain, based on the current voltage returned after a measurement. The idea is, to get the most reliable resistance measurement by assuring that the current measurement taken with a specific gain setting, is not taken on the lower 1% of that gain.

[Bharatinder Sandhu]

Hi Bill:

Thanks for contacting National Instruments.

The best way to use the most appropriate gain is to set the voltage range of the incoming signal and let the NI-DAQ driver choose the best gain to apply for that range.

The DAQ card has some predefined gain settings which the NI-DAQ driver selects from depending on the input limits.

To find out what input ranges correspond to what gain, please refer to Appendix A Specifications of the E Series User Manual. Table on page A-2 shows the relationship between the input signal ranges and the channel gain that the NI-DAQ driver chooses.

I hope this helps. Please do not hesitate to to contact me back if you need additional information.

Re
gards,
Bharat S
Applications Engineer
National Instruments

[billb]

Bharatinder : I thank you for the answer. I have had a hard time trying to find what I need, the "searches" do not always point you in the right direction. You stated in your answer that I should let the DAQ board select the proper gain. How do you do this?? I am using the AI_VRead function and it has a "Gain" parameter. What I do is take an initial measurement, look at the voltage returned, check it against the gain(voltage range) to assure myself that I am using the proper gain. You can respond back via: bookin@us.ibm.com....
Thanks so much for the quick response and for your help.