Hi, I'm trying to make a bias supply for an amplifier using the USB 6008. The ranges I'm looking at are -0.5 to 0.5 V and 0.5 to 2.5 V. To generate negative voltages I'm using the +2.5V output as a 'ground' for a differential voltage reading. The voltage measurements have an offset which varies with voltage, after accounting for this by plotting these variations and adjusting the output from the DAQ there is still a 'noise' of +/- 1 mv as can be seen from this plot of voltage against sample number:
It appears that at some point the values are being rounded to the nearest millivolt. I need to get to a resolution of 0.5 millivolts for my device, will this be possible with the USB 6008?