The thermal resistance of the main way to lead

Thermal resistance of the main way to lead three wire system: at one end of the thermal resistance of the roots join a lead, on the other side connecting two leads the way called three wire system, this way is usually applied with bridge, can better eliminate the influence of the lead resistance, is commonly used in industrial process control.

thermal resistance using three wire connection. Using three wire system is to eliminate bridging conductor resistance caused by error of measurement. This is due to measure the heat resistance of circuit is normal unbalanced bridge. Thermal resistance as a bridge, a bridge arm resistance, the connecting wire ( From the thermal resistance is controlled by the) Also become a local bridge arm resistance, the local resistance is unknown and change with environment temperature, form error of measurement. Using three wire system, will lead a received the power supply end of the bridge, the other two root to distinguish from thermal resistance of bridge arm and adjacent bridge arm, so lost the conductor line thermal resistance measurement error.