How many ways is there for thermal resistance wire leading out ? What are the effects ?

There are 3 ways for thermal resistance leading out: 2-wire system, 3-wire system, 4-wire system.
The wiring of 2-wire system thermal resistance is simple, but the additional error of lead wire resistance should be brought. Therefore, it is not suitable for the manufacture grade A precision thermal resistance, and the lead wire shall not be too long when using.
3 wire system can eliminate the influence of lead wire resistance, and the measurement accuracy is higher than that of 2 wire system. As a process detection component, it is the most widely used.
4-wire system not only can eliminate the influence of lead wire resistance, but also eliminate the influence of the connection wire’s resistance when the resistance value of the connection wire is the same. 4 – wire system is used in high – precision measurement.