量具小知识：量具的三大用途与三大分类

　　量具的三大用途与三大分类

　　1、标准量具

　　指用作测量或检定标准的量具。如量块、多面棱体、表面粗糙度比较样块等。量具

　　2、通用量具

　　也称万能量具。一般指由量具厂统一制造的通用性量具。如直尺、平板、角度块、卡尺等。

　　3、专用量具

　　也或称非标量具。指专门为检测工件某一技术参数而设计制造的量具。如内外沟槽卡尺、钢丝绳卡尺、步距规等量具是以固定形式复现量值的测量器具，

　　特点如下

　　1、本身直接复现了单位量值，即量具的标称值就是单位量值的实际大小，如量块本身就复现了长度量的单位。

　　2、在结构上一般没有测量机构，没有指示器或运动着的元部件。如量块只是复现单位量值的一个实物。

　　3、由于没有测量机构，如不依赖其他配用的测量器具，就不能直接测出被测量值。例如量块要配用干涉仪、光学计。因此它是一种被动式测量器具。

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