The signals go to a DDC (DX-9100) so that we can simulate transducers or transmitter signals. The 0-10V has a 300 Ohm impedance and the 4-20 has a 100 Ohm impedance.
We usually have potentiometers to vary the signal so that we can test staging of fans, compressors, etc. If I could build an op amp circuit cheap then they will approve the project.
I will try an figure out how to post a couple of PDF's of what we currently use and what I reverse engineered from the old test panel and put them up.
Thanks.
