I have a sensor connected to my pcb at a distance of 15 meters. The connection has 3 wires:
1. power (12vdc)
2. gnd
3. signal (0~5vac)
Power and ground are tied to pcb's 12V dc power supply. Signal is tied to an op amp.
The wires are inside a cable with some mesh shielding. Should I connect this shielding to something - power supply 12vdc output's ground? Power supply 110vac input's earth prong? The piece of metal plate my pcb is sitting on? Leave it unconnected (which is what I have right now)...
1. power (12vdc)
2. gnd
3. signal (0~5vac)
Power and ground are tied to pcb's 12V dc power supply. Signal is tied to an op amp.
The wires are inside a cable with some mesh shielding. Should I connect this shielding to something - power supply 12vdc output's ground? Power supply 110vac input's earth prong? The piece of metal plate my pcb is sitting on? Leave it unconnected (which is what I have right now)...