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精密仪器都要求一定的环境条件,主要是温度条件。为了保证精密仪器的准确度,一般籍助于恒温室。可否在某些计量项目上,突破恒温室的约束,采用其他方法同样达到保证精密仪器准确度的目的呢。多数精密直流电位差计(0.05级以上)都是实验室型的,它的基本成套设备中,只有标准电池及电位差计主件两者是有温度限制的。由于标准电池的电动势对于温度的变化具有滞后效应,现行标准电池检定规程中规定:被检标准电池在检定之前恒温(在20℃附近一定范
Precision instruments require certain environmental conditions, mainly temperature conditions. In order to ensure the accuracy of precision instruments, generally contribute to the greenhouse. Is it possible to break through the constraint of constant temperature chamber on some measurement items and to adopt other methods to achieve the same goal of ensuring the precision of precision instruments? Most precision DC potentiometer (0.05 above) are laboratory-based, and its basic equipment, only the standard battery and potentiometer main parts are both temperature-limiting. Since the standard battery electromotive force has a hysteresis effect on the change of the temperature, the current standard battery verification procedure stipulates: the standard battery to be checked is kept at a constant temperature before the calibration (a certain range of around 20 ° C