ITS-90 RTD Calibration

[abigailmoore]

I am working with some RTDs that I got calibrated at my company's in house calibration lab. The data sheet I got had ITS90 coefficients, but I only see an option to adjust for Callendar Van-Dusen coefficients. Does anyone know how to use ITS90 coefficients in LabVIEW or get the resistance measurement from the RTD so I can use the ITS90 coefficients in my post analysis? 
Thanks!

[cbutcher]

Hi Abigail,

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@abigailmoore wrote:

The data sheet I got had ITS90 coefficients, but I only see an option to adjust for Callendar Van-Dusen coefficients. Does anyone know how to use ITS90 coefficients in LabVIEW or get the resistance measurement from the RTD so I can use the ITS90 coefficients in my post analysis? 

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I guess my first question would be, how are you planning to measure the RTDs? (I also don't see CVD coeffs on the DAQmx AI > Temp > RTD option, which was what I first guessed you were looking at).

If you can measure a voltage, you'll have an easy time post processing, but this requires some arrangement of your resistors, current or a reference resistor, etc.

[abigailmoore]

Hi,

I'm measuring the RTDs with an NI 9217 cDAQ. The cofficients I'm talking about are the a, b, c, and Ro values if you use a custom RTD.

Thanks!

Abigail