I dont have the details of the system such as diagrams schematics. So this will be a big picture question.
I have a system where a 4 gauge transducers are connected to an amplifier box. Amplifier box also supplies power to the transducers. Amplifier box is supplied by 12V power supply. The problem was, at the output I observe around 25mV 1Hz square wave noise on outputs. I tried with different 12V power supplies one was 1A rated I had the same issue.
So I sent the system back to the supplier and they examined the same setup didn't observe this noise.
The only difference is that we use different 12V power supply for the amplifier. And in US they use 60Hz AC mains and we use 50Hz(I don't think this has any effect though).
I just checked the manual again and it says the power supply recommended for this amplifier is 12V and 2A.
Can this be the reason for a 25mV square-wave noise. Would using lets say 12V 1A power supply cause such issue instead of a recommended 12V 2A power supply?
Since the only difference between the setups is the power supply they use I couldn't find any other reason for the source of this type of noise.