Three thermal resistor wire connection

Thermal resistance is the temperature of the resistance with the temperature change detecting element. It is the use of objects, Common is a specific metal or semiconductor materials) The conductivity of the temperature change and the principle of change is made. It is directly proportional to the change of resistance with temperature, as temperatures rise and become uniform growth. Thermal resistance under below to see how three-wire system wiring

1, of the three bai thread by the multimeter resistance, resistance to du0 two wires short answer ( Actually for a small resistance, zhi, the value is the line resistance to eliminate line dao resistance's influence on the measured value) And the other lines to connect the other end of the measuring instrument.

2, thermal resistance using three wire connection. Using three wire system is to eliminate the measuring error caused by the connection wire resistance. This is because the measuring thermal resistance of circuit is usually unbalanced bridge. Thermal resistance as a bridge bridge arm resistance, its connection wire ( From the thermal resistance is controlled by the) This part also become a part of the bridge arm resistance, resistance is unknown and change with environment temperature, cause measurement error. Using three wire system, will lead a received the power supply end of the bridge, the rest of the two respectively from thermal resistance of bridge arm and adjacent bridge arm, this eliminates the wire line resistance measurement error.