一、前言目前,国内生产的力标准机基本上都是单功能的,有液压式力标准机、静重式力标准机、叠加式力标准机等。各种力标准机量程、准确度、可操作性、性价比等也各有特点:静重机准确度高,但一般量程小,大量程成本太高;液压机量程大,但操作繁琐;叠加机可以和液压机一样实现大量程,且操作方便,但长期稳定性差。这几种力标准机的使用功能单一且有限,一个计量部 I. Preface At present, the domestic production of standard machines are basically single-function, with a hydraulic standard machine, static heavy standard machine, super-standard standard machine and so on. Various force standard machine range, accuracy, operability, cost-effective also have their own characteristics: static and heavy machine accuracy is high, but the general range of small, large-scale cost is too high; hydraulic machine range, but the operation is cumbersome; As with the hydraulic machine to achieve a large range, and easy to operate, but the long-term stability is poor. The use of these types of force standard machine features a single and limited, a metrology department