论文部分内容阅读
动圈仪表由于其原理、结构简单,测量机构在工作时消耗功率很小,价格低廉,所以广泛应用于科研生产、教学实验中。动圈仪表主要缺点除抗震动、抗冲击性能较差,还在于目前精确度最高为1级,不能用于控制要求较高的场合。如何改进测量单元电子线路,提高动圈仪表测量精确度是本文探讨的主要内容。一、存在的误差动圈仪表测量机构的主要部件是一个磁电式动圈测量机构。由检测元件获得的信号,经测量电路转换成流过动圈的微安级电流;磁电式动圈测量机构再把电流大小转换为动圈偏转角并指示。若加上附加控制装置,即可以成为自动控制、自动报警的仪表。动圈仪表在校验条件下,仪表本身回差、不完全平衡误差、标度误差、校验仪表的误差、张丝和磁钢随温度变化对测
Dynamic instrument due to its principle, simple structure, measurement agencies in the work of small power consumption, low prices, it is widely used in scientific research and production, teaching experiments. In addition to moving the main shortcomings of the instrument anti-vibration, impact resistance is poor, still lies in the current level of accuracy up to 1, can not be used for control of higher occasions. How to improve the electronic circuit of measuring unit and improve the measurement accuracy of moving coil instrument is the main content of this paper. First, the existence of the error Dynamic instrument measuring the main component of the measuring mechanism is a magnetic-type dynamic measuring mechanism. The signal obtained from the detection element is converted into micro-ampere-level current flowing through the moving coil by the measuring circuit. The magnetic moving coil measuring mechanism then converts the current into a moving coil deflection angle and instructs it. If coupled with additional control device, which can become automatic control, automatic alarm instrument. Dynamic instrument in the calibration conditions, the instrument itself back to the poor, not fully balanced error, scaling error, calibration error, wire and magnet with temperature changes on the test