检测工具和方法的发现和发展取决于合理的测量和检验技术的研究与应用。大载荷中等精度(国际法制计量组织规定的Ⅲ级)的机电秤目前还必须用砝码检定。测重机构、补偿器、指示器和附加装置的分单元检定,至今还只能在准确度要求不高的情况下进行。目前常用50千克的砝码来检定和调整机电秤。在检定时这些砝码是由许多工人用简单的机械辅助工具搬运的。与此相比,使用质量为500千克和 The discovery and development of testing tools and methods depend on the research and application of sound measurement and inspection techniques. The electromechanical scale with medium load of medium load (Class Ⅲ of International Legal Metrology Organization) must also be checked by weight at present. Sub-unit verification of weighing mechanisms, compensators, indicators and add-ons is still only possible with less demanding accuracy. Currently used 50 kg weight to check and adjust the mechanical and electrical scales. These weights are handled by many workers with simple mechanical aids when checking. Compared with this, the quality of 500 kg and