cameronasmith:
Hi,I have a strain gauge going to an OPAMP (INA125P) with a BIG gain, and I am thinking that I need to put a high pass filter on the line.
My question is should I do this before it goes to the OPAMP or after? If i do it before will it not just cause more noise on the circuit.
Also, I'm thinking it should be a high pass filter because on the datasheet it seems to be worse on lower frequencies.
http://www.ti.com/lit/ds/symlink/ina125.pdf
Thanks,
Cameron.
You definitely don't want a high-pass filter on a DC measurement
since you'll lose the DC component.
A low-pass filter makes sense. What are you trying to achieve?