一、引言在精密电阻测温技术方面,四端温度传感器的电阻测量需要达到千万分之一的准确度。为了把自热影响减至最小,电阻测量应在最低电平上进行,以便提供所需的分辨力。因此,在电桥中保持低的噪声电平是极为重要的,同时,还应确定自热影 I. INTRODUCTION In the precision resistance temperature measurement technology, the resistance measurement of the four-terminal temperature sensor needs to reach the accuracy of one ten millionth. In order to minimize the effects of self-heating, the resistance measurement should be performed at the lowest level to provide the desired resolution. Therefore, it is extremely important to maintain a low noise level in the bridge, and at the same time it should be determined from the thermal shadow