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Thanks Mr. Alan A I am "434343" memeber. I recive your response to my question about "Max input voltage of PCI-6023E" .But I have some questions.
According to the "Data Acquistion Specification- a Glossary by Richard House" ( Application Note 092): "Maximum Working Voltage (signal+common mode)= the highest voltage level that can be input to board without saturating the input." And according to your response: "measuring a signal with higher common mode voltage than that(11V) might not accurate"
But in may experiment with a potentiometer (floating differntial source with (-)13.5V and (+) 5to22V),I could successfully measure the signal without saturating and without error (Max error is about +/- 0.02 volt)!!
I think that the maximum working voltage of PCI-6023E is greater then 11 volt??!! or my measurement has a little error.
I think that I don't need to use a signal conditioning circuit. Please Help me. Thans again.
