Hi all
I have the task of sampling voltage for my regulation system, a high accuracy is needed hence the USB-6281. The signal can vary from 2,5mV to 400mV. Not constantly back and forth though,
I just want to be able to use the same circuit for all the applications. Another criteria is that I want to affect the circuit I am measuring as little as possible.
My idea is to route the signal through a voltage follower (a buffer) to electronically isolate the measurement from the circuit and then through a PGA and use the same type of high precision OP-AMP for both purposes (possibly the OPA4277) along with resistors and DPP's. The idea is to amplify the signal so that it is always the optimal voltage for the 6281 for the highest accuracy. For example just under 500mV or 5V, I wonder which is better?
So what do you the hardware geniuses out there think, all feedback would be greatly appreciated.
I am pretty new to creating electronics like this which is why I decided to post this prior to setting everything into motion.
