Hi,
I use DAQ 4461 to acquire sound pressure level from DUT and a ref mic. For the ref mic I use AI0 with the following config ( actually I use IEPE sensor)
After meas the output in pascal then I close this line and then I use AI Volatge input (AI1) to acquire the data from DUT. The first time I run the vi everything is fine but if I run the VI again AI.Microphone reading becomes very high with no reason. I have noticed if I disable the part for AI Voltage after few runs it will settle and show me the right value. I don't have this problem if I completely remove the AI Voltage part. I thought for this particular DAQ both lines are independent and can be run at the same time but I don't know why the AI Volateg run has effect on the reading for AI Microphone. Could you please help me with this?
You can se here the diff betwen first run and second and third ( As you can see the first run before AI1 run is fine) . I ahev also attached my code
