Read continous voltage wih PCI 6025E but get a sinewave

[mihai.parlea]

I am trying to read a continous voltage on the first channel of my PCI 6025E, but all that I have tried results in a sinewave or a similar variation beatween -2 and +1V around he imputed value.

I tired the Labview example, the diagnostic mode in Measurment and Automation, my own program, calibrated the board automatically and manually, the diagnostic check gives the ok, but the result is still wrong.

What could I do to correct the problem and get a stable reading on the graph?

(I can post screenshots if it could help)

[Andrew McL]

Hi mihai.parlea,

Does every analog input channel on this device give the same result or is it only this line? What is the frequency of this sine wave and does it vary? It could be due to incorrect setup of your system grounding. I have added a link to some of the information regarding grounding here. Could you possibly send in a screenshot of the input when viewed in Measurement and Automation?

thanks,

[mihai.parlea]

Thank you, I solved he problem.

(The connections to the 100-50-50 were wrong, the positive was connected to AI 0 (3) and the negative to AI GND (0), after connecting the negative to AI 8 (4) the result was correct (the connections were made by the previous person that worked with the board and were left for me as correct connections 😐 )).