Are signals from instruments susceptible to interference from strong magnetic fields?
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Current signal? Frequency signal? Voltage signals including millivolt signals?
They are all prone to interference.....
My experience is that they haven’t received any interference
I have encountered interference with millivolt signals; nothing else of that kind has happened. In the past, I didn’t even need shielded cables – I used four-core cables instead. The two extra wires were used for protection against freezing, along with electric heating, and yet no interference was observed. Of course, it wasn’t DCS at that time either.
Voltage signals in millivolts (such as various types of thermocouples), frequency signals (such as vibration, displacement, and speed of machinery), are most susceptible to interference, while direct current signals are the most stable.
I guess millivolt signals are quite susceptible to interference from magnetic fields; sensors such as electromagnetic flowmeters output millivolt signals...
Analog signals are likely to be subject to interference~