微观不平度十点高度R_z值测量基准线的选取

The Selection of Ten-Point Height of Irregularities R_z for the Measuring Bearing Line

国家标准规定以中线为测量基准线评定Rz参数值．但有些资料认为在用光学仪器测量Rz值时，可采用平行于中线的任一直线作基准线进行测量．这造成测点的选取往往与标准定义不符，测量结果受主观影响较大。本文对Rz值的测量进行了研究，通过采用不同基准线恻得Rz值的比较、分析．得出对Rz值的测量必须按国家标准规定的以中线为基准线进行测量的结论．并给出了正确的取点方法．

The national standards stipulate centerline for bearing line to assess the parameter value of Rz, butsome documents adopted the random line, which parallels centerline for the measuring bearing line. Thereforeselection of measuring point does not often accord with standard definitions. This paper puts forward suspicionabout it and presents the correct way of selection points.