Thermal resistance is used as a component of temperature measurement. What is the measurement of what measurements are converted to?
The measurement of temperature is converted to the measurement of current.. The temperature is obtained from the change of the current and the change of the resistance with the temperature.
1 tier system: at both ends of the thermal resistance is respectively connected with a wire leads to the resistance signal mode called two-wire wire: this method is very simple, but because the connecting wires must exist lead resistance factors of R and R, the size and the length of the wire material, so this method is only applicable to the wire measurement accuracy is low;2, three wire connection lead wire at one end of the thermal resistance of the root, the other end is connected to two leads the way is called the three wire, usually with the bridge supporting the use, can eliminate the influence of wire resistance is good, the lead resistance most commonly used in industrial process control.3, four line: at both ends of the root of thermal resistance is connected to each of the two wires is called the four line, the two leads for thermal resistance to provide a constant current I, convert R to U voltage signal, and then through the other two leads to U to two meters. It can be seen that this lead way can completely eliminate the influence of lead resistance, mainly used for high-precision temperature detection.
A thermal resistor is a primary element that converts temperature changes into resistance values. Usually, resistance signals are transmitted to the test control device or other instrument to display the corresponding temperature through the wire.
