Update on my testing - I have just build up a second panel in essentially the same configuration and don't have a noise issue - i.e. power supplies in same casing, with same grounding scheme, but I don't have any incoming sensor wires yet. I don't seem to have any issue with noise here, so I...
My current system uses 'Warning' which just notifies the user, and then 'Critical' which causes the process to shut down. Some of these may be literal high alarms, and others are low values.
I dont consider it as a ground, but since the measurement are single ended, and the sensors are referenced to ground, I tie the measurement (-) input to ground. Is this correct?
I'm not exactly sure what you mean by floating or grounded supplies. The input is 240V AC with an earth. The power...
Thanks for the responses.
They are switched mode supplies (I believe) one from NI and the other pheonix contact. Both of which are used in both setups, although different power ratings, and not enclosed in the first lab. I have also tried powering from a 3rd supply located outside of the...
Hi All,
I am hoping you might have some ideas on a problem I've been having with signal noise. I've been searching around for ideas, and have tried quite a few things, but am a bit stumped. I keep reading that 4-20mA is supposed to be less susceptible to noise, which is only confusing me...
