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1 范围1.1本标准为引伸计系统的检定和分级程序,而不作为引伸计的整个规范。本方法仅适用于指示或记录与相应拉伸或压缩应变的长度变化成比例数值的仪器.引伸计系统按其误差大小分级。1.2按英寸一磅单位表示的值作为标准。注:直接粘贴在试件上的粘接式电阻应变计不能用本标准中所述的具有确定标点检定引伸计的仪器进行标定或检定(参见试验方法E251所述程序)。
1 Scope 1.1 The standard extensometer system for verification and grading procedures, rather than as an extensometer of the entire specification. This method is only applicable to instruments that indicate or record a proportional change in the length of a corresponding tensile or compressive strain The extensometer system is classified by its error. 1.2 The value expressed in pound-inch units is the standard. Note: Bonded resistance strain gages that are directly attached to a test specimen can not be calibrated or calibrated using the instrument with a defined punctuation test extensometer as described in this standard (see Test Method E251).