I can't read thermocouples on the PXI-6225-series M 1 connector.

I'm reading 30 measures by thermocouple in differential mode.  I use AI0 as the CCM.  Attached are the connections that I use.  Negative contributions all relate directly to the GND AI.

I have no problem to read the thermocouples in slot 0 (AI1 by AI 7).  I have install Connector 1 direct feed by mode (switch 1 & 2 right and switch 3 upwards).  In MAX, I get a normal reading, but it does not vary by heating the thermocouple.  In my real program, it is as if there is nothing connected. Any ideas as to what I can hurt?

Thank you

Mark

Mark,

Thanks for posting. I think the question might be to see you about the how the SCB-68 must be configured in mode of direct crossing to be used with the connector 1 on the PXI-6225. When the switches on the block are defined for a direct crossing, the Council is not connected to the CJC. Do not have a connection to a CCM on this connector could cause this problem.

A potential solution, you can try is to connect a temperature probe to AI16 and follow the steps in this KB, using that channel instead of the CJC channel. Let me know if it helps!

Kind regards

Joe S.

Tags: NI Hardware

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