cDAQ-9174 returning sinusodial waves

[jadynnheart]

Hi everyone!

I have been using an cDAQ-9174 with a NI9203 in order to measure temperature through a pyrometer, and a coworker of mine has been using it to measure temperature off of a NI 9201. I have previously used this with no issues, yielding accurate waveforms of temperature, but now the daq is returning sinusodial waves that never go above the value of 2. I think this is because the chastise is dead, but I'm not sure how to test to ensure that it is not useable anymore. Does anyone have any insight on this? Thank you!

[Kyle97330]

Is it possible that you are accidentally referencing a simulated DAQ device?

https://www.ni.com/docs/en-US/bundle/ni-daqmx/page/readwritesimdev.html

"All NI-DAQmx simulated devices return analog input data in the form of a full-scale sine wave with 3% of full-scale noise."

[jadynnheart]

I don't believe so.

[santo_13]

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@jadynnheart wrote:

Hi everyone!

I have been using an cDAQ-9174 with a NI9203 in order to measure temperature through a pyrometer, and a coworker of mine has been using it to measure temperature off of a NI 9201. I have previously used this with no issues, yielding accurate waveforms of temperature, but now the daq is returning sinusodial waves that never go above the value of 2. I think this is because the chastise is dead, but I'm not sure how to test to ensure that it is not useable anymore. Does anyone have any insight on this? Thank you!

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9201 is a voltage input card, and 9203 is a current input card; they are fundamentally different.

Where do you get the temperature signal from? a regular thermocouple or a 4-20mA compatible transmitter/sensor?

[jadynnheart]

I get the temperature signals from a pyrometer, it returns current and then converted into temperature. My coworker, who uses the 9201, measures temperature from a thermocouple.

[santo_13]

Please share your pyrometer datasheet to understand the current to temperature scaling, code to ensure you're setting up the hardware and the actual connections.

[jadynnheart]

Here is the data sheet and a photo of the labview block diagram.

[santo_13]

A screenshot of your VI is useless as it doesn't show how you configured the DAQ Assistant. I advise against DAQ Assistant and instead use DAQmx drivers.

Refer to this article but skip the DAQ Assistant part - https://www.ni.com/en/support/documentation/supplemental/06/learn-10-functions-in-ni-daqmx-and-handl...

You did not share your exact wiring connection between the IR thermometer and the DAQ card which is crucial.

Temperature to current scaling factor is not evident from the datasheet (is it implicit based on supported temperature range?)