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动圈式仪表因体积小、价格低、灵敏度高、使用方便而广泛地用于各种温度控制装置中,但因热电偶的电动势随温度变化的非线性造成的误差以及检定时信号源内阻对检定示值的影响往往没有引起一些仪表人员的足够重视而造成较大误差,我厂就有类似情况发生。 1.XCT-101仪表由于内部无参比端补偿器,在工厂使用时又往往医条件限制、安装不便等原因也未外加参比端补偿器在工厂里,动圈式仪表示值误差检定后,有的断开补偿导线,将指针调至20℃,以指针读数为实际温度;有的调至零位,使用时加上室温。
Because of its small volume, low price, high sensitivity and easy to use, moving-coil instruments are widely used in various temperature control devices. However, due to the error caused by the non-linearity of thermocouple emf with temperature and the internal resistance The impact of test indication often does not cause enough attention to some instrumentation staff and cause greater error, I plant a similar situation occurs. 1.XCT-101 instrument due to the internal non-reference end compensator, often used in the factory when the medical conditions are limited, the reasons for the inconvenience of installation, etc. are not plus reference compensator in the factory, dynamic instrument indication error after verification , And some disconnect the compensation wire, the pointer adjusted to 20 ℃, the pointer readings for the actual temperature; some adjusted to zero, plus use at room temperature.