floating voltage in BNC 2090, PCI 6024E

[Roshan]

Hi experts, I have a single ended connection on a BNC 2090 connected to PCI 6024E board. However, when I leave it connected(without any input) I see that the voltage gradually increases to +10V. Even when I input a signal, I see that the 10V forms a baseline, which hinders any measurement. Is this some sort of grounding problem? Kindly post any helpful thoughts on this matter. thanks. Roshan.

[Mcdan]

Roshan,

I believe that the 2090 has a switch for each channel which configures the inputs for either Single Ended configuration (AI channel is read with respect to your 6024's Analog Input Ground) or Differnetial configuration (AI channel reads signal on BNC connector differentially). Ensure that the terminal configuration you have programmed for you channel matches the terminal configuration selected by the switch on the 2090. If you do not make any explicit setting, the 6024 will default to differential mode.

I hope this helps,
Dan