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电阻RM是锰铜制的降压电阻。经降压后测量电桥间 CD的电压保持稳定的 4伏直流电压。 （2）电位计 动圈式指示仪由于其实质为一测量电流机构,所以仪表精度较低,工业用的精度为1级。这主要是由于①连接导线之温度变化将影响测温读数;②它利用热电势形成的电流推动指针偏转,此电流很小,所以动圈运动系统的摩擦和阻尼对仪表的灵敏度有些影响;③其运动部分较脆弱,怕震动;④测量机构的指针特性较差,指针稳定需一定时间,对快速调节测温有影响。因此,当需要精密测量温度时,一般采用直流电位计,亦称电位差计。
Resistor RM is a manganese-copper step-down resistor. After the step-down measurement of the voltage across the bridge between the CD to maintain a stable 4 volts DC voltage. (2) Potentiometer moving indicator because of its essence as a measuring current mechanism, so the instrument accuracy is low, the accuracy of industrial use is 1 level. This is mainly due to ① the temperature of the connecting wire will affect the temperature reading; ② It uses the current formed by the thermoelectric power to promote the deflection of the pointer, the current is very small, so the kinematic friction and damping of dynamic system has some impact on the sensitivity of the instrument; ③ Its movement is more fragile, afraid of vibration; ④ measuring mechanism of poor pointer characteristics, the pointer needs a certain amount of time to stabilize, rapid adjustment of temperature effects. Therefore, when the need for precision measurement of temperature, the general use of DC potentiometer, also known as potentiometer.