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Logging Trend Data Spike

For starters I am fairly new to data collection. I am experiencing logging issues with an existing system. The required sampling rate is 100s/s or faster. I understand that the modules are limited based on data type. The last module is a 9229 which I am feeding a conditioned 0 to 10v scaled signal into for 0 to 1700 degrees C, which is represented by the blue line. The other data is straight type S thermocouple inputs to a 9219 module. My issue is that, the sampling seems fine on the voltage input but the stair stepping roughly every .2 seconds is causing concern about data purity. Is this a setup issue or limitation of hardware/software? If it is a hardware issue, what would be a more suitable DAQ?  

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The sampling rate of NI-9219 for thermocouples measurement varies between 20ms to 510ms, depending on the resolution mode.

See NI-9219 Specifications

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Applications Engineer | TME Systems
https://tmesystems.net/
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https://github.com/ZhiYang-Ong
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