Making sense of your 4 wire pt100 wiring diagram
If you're staring at a 4 wire pt100 wiring diagram and wondering why on earth you need four leads for a simple temperature check, don't worry—it's actually much more straightforward than it looks. While a two-wire sensor is the "plug and play" version of the temperature world, the four-wire setup is what you use when you actually care about precision. It's designed to solve one specific, annoying problem: the resistance of the wires themselves. ...