Ni 9205 Same voltage for all pins

[himer314@gmail.com]

I am using an NI 9205 module (connected to a cDAQ-9174) with an RSE terminal configuration to measure a 1-5V signal from a transducer (1-5V, 1000-5000 psi). I need to measure two specific pins. In NI MAX, I can view data for all pins, but the issue is that only one pin is measured correctly, and its value is replicated across all pins—including those that have no connections—as well as the second pin, which is connected to a different transducer and should display a different measurement. Why is this happening?

[santo_13]

This is called Ghosting, and it is common on multiplexed ADC devices. Since you did not connect any signal to the rest of the channels, you should not be considering the values measured there, or if you really care, you can connect the unused channels to GND.

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YHy6CAG&l=en-US

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P84RSAS&l=en-US