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Temperature Readings With NI-9211 Are Off By Some Degrees

Primary Software: Driver Software>>NI-RIO
Primary Software Version: 2.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: CompactRIO>>Analog Input Modules>>NI 9211

Problem:
When using the NI-9211 temperature module, I can see that there is a couple of degrees error at very high or very low temperatures. Why is this?

Solution:
The module itself works fine. The problem is with the VIs used for converting the data from binary values to engineering units. Inside these VIs there is an equation that has an error due to an approximation. The error that this approximation gives is a linear error; that is why at high or low temperatures you can see the error.
To fix this problem, download the attached files and replace the existing 9211 Support Files.llb file with the new one. The path where the existing file and where you need to save the new one is.

For LabVIEW 8:
C:\Program Files\National Instruments\LabVIEW 8.0\examples\CompactRIO\Module Specific\NI 9211

For LabVIEW 7.1:
C:\Program Files\National Instruments\LabVIEW 7.1\examples\FPGA\CompactRIO\cRIO-9211

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Report Date: 12/27/2005
Last Updated: 12/27/2005
Document ID: 3SQCSCRY

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