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我们对 EWY-103型圆图电子电位差计(简称仪表,下同)通电预热后,输入满量程信号,指针位于刻度的最小端,且可逆电机向指针最小端方向旋转,只偶尔向上抖动一下,加入数倍于满量程的信号,指针才缓慢地向上移动。为此,对该故障进行检查。经查证,仪表外观可见部分无问题,则怀疑故障出在信号输入回路。故断开仪表电源,在热电偶的信号输
We EWY-103-type circular figure electronic potentiometer (hereinafter referred to as the instrument, the same below) power preheating, the input full-scale signal, the pointer is located at the minimum end of the scale, and the reversible motor to the minimum direction of the end of the pointer rotation, and only occasional upward shake A few times, adding a few times the full range of the signal, the pointer moves slowly upward. To do this, check the fault. After verification, the appearance of the instrument visible part of the problem, then suspected of failure in the signal input circuit. So disconnect the instrument power supply, the thermocouple signal input