USB 6353 analog input does not match analog output

[foil_nu]

Hi all, 

I'm just getting started with using a USB 6353 board. When we plugged in the device we were actually interested in via analog input, we noticed some signal drift over time. When we tried changing from our device to a function generator, we still noted this drift. So to troubleshoot, we plugged an analog input channel into an analog output channel on the 6353 board. I modified an example code for continuous voltage - so I send the voltage to the analog output (plugged into analog output and ground on the DAQ), which I have connected to an analog input (plugged into the analog input + and analog input -). I know exactly what I'm sending to the output, and it's definitely not what the input is reading in:

There is both a drift over time as well as very different signal amplitude. I'm new to all this so open to any and all troubleshooting suggestions! Thanks in advance!

[santo_13 · Accepted solution]

Could you please share this VI you used and a wiring diagram of the terminals you've looped back?

Have you tried other AI channels? you might want to use the AI in single-ended mode (RSE) since AO is also RSE.

[foil_nu]

Thanks so much Santhosh! In case anyone else ends up with this issue, using the AI in single-ended mode (RSE) solved the problem - we wired the AI+ and AI ground and then in the built-in AI Voltage sub-VI specified RSE mode. No drift, and correct amplitude.