JJG(铁道)157-2004钢轨探伤仪检定仪检定规程.pdf

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1、JJG(铁道)中华人民共和国铁道部部门计量检定规程JJG(铁道)157-2004钢轨探伤仪检定仪CalihraterofUltrasonicFlawDetectorforRail2004-04-22发布2004-11-01实施中华少味民共和国铁道部发布JJc《铁道)157-2004钢轨探伤仪检定仪检定规程铁道)1J(铁道VerificationRegulationforCalibraterofUltrasonicFlawDetectorofRail本规程经铁道部于2004年04月22日批准，并报国家质量监督检

2、验检疫总局备案，自2004年11月01日起施行。归口单位:铁路计量技术委员会主要起草单位:铁道部标准计量研究所参加起草单位:柳州铁路局技术监督所广州铁路(集团)公司中心计量所本规程技术条文由铁路计量技术委员会负责解释。JJG(铁道)157-2004本规程主要起草人:左荣森(铁道部标准计量研究所)罗映明(柳州铁路局技术监督所)参加起草人:唐贵强〔广州铁路(集团)公司中心计量所〕郑党儿〔广州铁路(集团)公司中心计量所〕JJG《铁道)157-2004目录月已范围·..........................

3、....................................................................................1，‘概述·······································································································⋯⋯1内j计量性能要求···、················、··、·，··、······、、，··‘··，、·，·“‘·，、、

4、、·‘···、、··、‘····，、‘·，，、“‘。一14通用技术要求······························································································⋯⋯1计量器具控制································，··································································一111检定条件············

5、··························································································⋯⋯1一气，乙检定项目及主要检定标准器·····················，·····，··································一“⋯⋯’““2﹄、内，~检定方法·············································。·······················

6、·······························⋯⋯2﹄、~检定结果和检定周期····················································································⋯⋯4附录A钢轨超声波探伤仪检定仪检定原始记录············，············································⋯⋯5附录B钢轨探伤仪检定仪示值误差检定的不确定度评定·················，··

7、····························⋯⋯6JJG(铁道)157-2004钢轨探伤仪检定仪检定规程1范围本检定规程适用于钢轨探伤仪检定仪(以下简称检定仪)的首次检定、后续检定和使用中检验。2概述检定仪由标准衰减器和脉冲调制信号发生器组成。检定仪用于对新制造、使用中和修理后的钢轨探伤仪进行检定和校准。3计it性能要求3.1检定仪衰减器3.1.1总衰减量>}60dB.3.1.2当脉冲频率为1MHz--5MHz时，衰减器每增加或减少12dB衰减量，误差不得超过士0.3dBo3.2脉冲调制信号发生器

8、3.2.1频率2MHz10.1MHz，或选定频率误差不超过士10%03.2.2脉冲间隔误差不超过士0.6%03.2.3脉冲间隔:最小间隔<10fs，最大间隔>,45tLso3.2.4延时范围:单波相对触发脉冲的延时从20is到160[s连续可调。多波相对触发脉冲的延时>25tso3.2.5负载阻抗对测试的影响负载阻抗从40n变化到160n，检定仪每衰减6dB，其输出波幅为衰减6dB前波幅的50.1%