Calibrating DAQ Assistant

[bmunden]

Let's say that I take a signal from my MPX4015A and measure it with analog input 3 on my DAQ board.  I go to DAQ assistant and find the previously-configured scaling for my MPX4015A to convert the voltage signal directly to kiloPascals.

Now, how do I calibrate for a little bit of sensor inaccuracy?  I can go ahead and create tons of custom scalings, but it seems like there should be a little extra field that lets you calibrate the sensors using a certain measurement.

[Sandra_T]

Hello bmunden,

I am unfamilar with the MPX4015A  sensor. I tried looking for a data sheet for this device and was unable to find any information on it when I did a Google search.
What does this device do? Does it measure pressure and then output a small voltage? Does this device measure sound pressure or physical load pressure?

DAQ assistant does have the something called the Virtual Channel Calibration, refer to the following link.

NI-DAQmx Virtual Channel Calibration

Please give this a try and let me know if this resolved your issue. Else please clarify and I'd be glad to assist you.

  Sandra T.

Applications Engineer | National Instruments

[bmunden]

Woops.  I meant the MPX4105A.  I switched the 0 and 1.  No binary jokes, please.

http://www.freescale.com/files/sensors/doc/data_sheet/MPX4105A.pdf?srch=1

[Sandra_T]

Hello bmunden,

Thanks for the additional information on the sensor. It looks like you would be using a voltage task to make the measurements. If you wanted to calibrate your device, you can run the Channel Calibration Wizard in Measurement and Automation Explorer (MAX). This tool allows you to quickly calibrate the entire measurement path for a channel – from the sensor through to the measurement device – and then apply the resulting correction to every measurement taken on that channel. Take a look at the resource listed below.

NI-DAQmx Virtual Channel Calibration

Please let me know if you have any additional questions.

Regards,
  Sandra T.

Applications Engineer | National Instruments

[bmunden]

Awesome.  I knew there was a way.  I didn't think NI would make sensor software without having a way to calibrate for sensors.