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为了保证测量仪表能够准确可靠地工作,通常我们都要将制造厂提供的仪表在装机应用前,按技术条件的规定进行检定;另外,对使用中的仪表也要进行定期的检定与维修。因而一些具有机械反作用力矩仪表的指示器(或指针)不回零位值的测量,则是必须检定的项目之一,因为在国家标准GB776—76《电测量指示仪表通用技术条件》的规定中,仪表指示器不回零位值的确定是衡量仪表技术性能优劣的主要指标之一。
In order to ensure that the measuring instrument can work accurately and reliably, we usually need to verify the instrument provided by the manufacturer before installing the application according to the technical conditions. In addition, the instruments in use must also be regularly calibrated and maintained. Therefore, some indicators with mechanical reaction torque meter (or pointer) does not return to the zero value of the measurement, it is necessary to test one of the items, because in the national standard GB776-76 “Electrical Measurement Instrumentation General Technical Requirements” requirement , Instrument Indicator does not return to zero value is to determine the technical performance of the instrument one of the main indicators of merits.