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30.在现场使用中,引起动圈仪表故障的外界因素有哪些? 答:造成动圈仪表不能正常工作的外界原因有: (1)接线端子、热电偶正负极、补偿导线和补偿器等接错; (2)供电电源过高或过低(指配热电阻的动圈仪表)引起输入不平衡电桥的电源不是4V; (3)一次元件、补偿导线、补偿器接头接触不良; (4)一次元件回路中有断路、短路或碰地处; (5)仪表测量线和电力线布线不正确、仪表外壳接地不良而引起干扰。 31.动圈式仪表用于调节系统中为什么有时会出现吸针和排针现象?如何防止? 答:动圈式仪表在使用中,有时会出现检
30. In the field of use, caused by moving coil instrument failure of the external factors which? A: The moving coil instrument does not work outside the reasons for the outside: (1) terminals, thermocouple positive and negative, compensation wire and compensator Connect the wrong; (2) the power supply is too high or too low (thermal instrumentation with thermal resistance instrumentation) caused by unbalanced input bridge power supply is not 4V; (3) a component, compensation wire, compensator connector bad contact; 4) There is an open circuit, short circuit or touching place in a component circuit; (5) Wiring of instrument measuring line and power line is not correct, and the grounding of instrument case is bad and causing interference. 31 moving coil instrument used to adjust the system why sometimes needle and pin phenomenon? How to prevent? A: Dynamic instrument in use, sometimes appear seized