电子电位差计指示误差的测定,是维修温度仪表经常要做的工作,通常采用标准直流电位差计给被检电子电位差计输入毫伏电势,来校验仪表的精度和变差。具体校验方法一般有: (1)铜导线法:校验时将被检仪表输入端用铜导线与标准电位差计连接,并用水银温度计测量铜补偿电阻处的温度,得出附加电势,对被校温度点的热电势值进行修正。这种方法的主要缺点是,水银温度计必须放 Electronic potential difference meter indicates the determination of the error is to maintain the temperature of the instrument often do the work, usually using a standard DC potentiometer to be seized electronic potentiometer input millivolt potential to calibrate the accuracy and variation. Specific calibration methods are generally: (1) copper wire method: calibration will be seized instrument input terminal with copper wire and standard potentiometer connection, and mercury thermometer to measure the temperature at the copper compensation resistor, draw an additional potential, the right Corrected by the thermoelectric power point of the school temperature point. The main disadvantage of this method is that the mercury thermometer must be put