analog inputs mailfunction

[diwi]

Dear all,

Today I was doing measurements, when I suddenly realised all the analog inputs of the PCI-6250 DAQ card are mailfunctioning.

When I don't connect any signals to the card and I try to read the signals from MAX or signal express, the inputs seem to generate sine waves which reach their maximum: -10V and 10V. They all start at the same point every time I measure. When I do connect a small signal to the analog inputs, the input seems to neglect it and just shows the 20V p-p sine wave.

What could be the reason of this?

Kind Regards, diwi

[ninlmartijn]

Dear Diwi,

Thank You for your post on our discussion forum.

A open analog input can cause many problems like gohsting (readings from previous channels), charge injections and other incorrect readings. Please refer to the folowing knowledge base for this; https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P6TeSAK&l=en-US

Please find also the related links below this document.

I hope this answers your question, if not, please don't hesitate to contact me,

best regards,

Martijn S

NI Netherlands