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一、卷尺的精度为多少mm
工作和生活中,卷尺常用来测量物体的长度,不过不管是什么测量工具,都会存在一定的误差,卷尺也不例外,而且作为日常测量工具,卷尺的精度要求是没有那么高的,那么卷尺的精度是多少呢?
一般来说,卷尺的精度等级在尺带上会有标明,分为Ⅰ、Ⅱ
两个等级,大部分都是Ⅱ级,还有的没有印的,可能就是精度等级不过关,不过卷尺一般多少日常使用过程中,Ⅱ级的基本上就够用了。另外,卷尺的精度等级还与卷尺的长度有关,相对来说,卷尺越长,精度越高,误差越小。
根据规定,Ⅰ级精度等级的卷尺,在示值刻度不高于1cm时,允许误差为±0.1mm,高于1cm但低于10cm,误差为±0.2mm;Ⅱ级精度等级的卷尺,在示值刻度不高于1cm时,允许误差为±0.2mm,高于1cm但低于10cm,误差为±0.4mm。
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二、卷尺测量误差的原因有哪些
卷尺在实际的测量过程中,总会存在一定的误差,除了本身精度等级不够之外,卷尺产生误差的原因还有:
1、温度变化的误差
卷尺存在一定的热膨胀系数,对每米每度温差变化仅八万分之一,但相同的钢卷尺在温差较大的环境下还是会产生较大的长度变化,影响测量结果。
2、 拉力误差
拉力大小会影响卷尺的长度,在测量时如果不用弹簧称衡量拉力,会产生一定的误差,一般30米的尺长在±5公斤拉力误差时会产生±1.8毫米的长度误差。
3、卷尺不水平产生的误差
在使用卷尺测量的过程中,应尽量保持卷尺处于水平状态,否则会产生距离增长的误差。对于30米的尺长,尺的两端高差达0.4米时会产生约2.6毫米的误差。