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Connecting draw wire potentiometer to ni 9202

I am powering a draw wire potentiometer sensor externally with constant 5 Volts and then reading the voltage differential between the ground and the wiper using the NI 9202 card. The readings start clean but at random times the noise in the signal being read by the NI 9202 jumps in magnitude. I have supplied an example of what the card is reading as well as a measurement file. Any help solving this issue would be much appreciated. 

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How do you currently have your sensors connected to the 9202 and how many exactly? Does this behavior happen with each channel on the 9202?  Have you tried using another sensor to see if the issue persists?  It sounds most likely due to a wiring issue, so I would like to get more information about the physical setup.

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Applications Engineering
National Instruments
http://www.ni.com/support
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