JJG 746-2004

O.口. 0.0.O.0.。·0·0· 弓 Verification Regulation for Ultrasonic Flaw Detectors } JJG 746-2004 ;代替JJG 746-1991 飞.‘,.‘,.‘,.‘,.‘,.‘,.‘,.‘,.‘,.‘,.‘,.‘,.《,.己、 本规程经国家质量监督检验检疫总局2004年09月21日批准,并自 2005年03月21日起实施。 归口单位:全国声学计量技术委员会主要起草单位:中国计量科学研究院参加起草单位:中国测试技术研究院湖北省计量测试技术研究院本规程委托全国声学计量技术委员会负责解释 JJG 746- 2004 本规程主要起草人: 边文萍朱岩参加起草人: 郝豫川姚秋平 (中国计量科学研究院) (中国计量科学研究院) (中国测试技术研究院) (湖北省计量测试技术研究院) JJG 746- 2以月目录 1 范围··············,······。。················..........................·,,···········⋯⋯(1) 2 引用文献·····························,······················································⋯⋯(1) 3 概述·····································,······························,·····················⋯⋯(1) 4 计量性能要求······························,················‘··················,···,·······⋯⋯(1) 4。

1 水平线性误差,·,···············,··,····································,,···········⋯⋯(1) 4。

2 衰减器技术要求·············,··,·······································,,···········⋯⋯(l) 4。

3 垂直线性误差·,·········································································⋯⋯(1) 4。

4 动态范围·····························,···················································⋯⋯(1) 4。

5 电噪声电平·...................................................................................(1) 4。

6 最大使用灵敏度·····································,············,,,,···‘········⋯⋯(1) 4。

7 探伤灵敏度余量················,···················,·,··································一 (1) 4。

8 扫描范围········,········································································⋯⋯(2) 4。

9 分辨力···················································································⋯⋯(2) 5 通用技术要求··,··,·..................··································,············⋯⋯(2) 5。

1 外观···,·,,····,··‘····。··,·,,,·,,······························,···,·,·············⋯⋯(2) 5。

2 铭牌、标志和使用说明书······。,···················,·····················,·········⋯⋯(2) 6 计量器具控制················。····················。········································⋯⋯(2) 6。

1 检定条件···············································································⋯⋯(2) 6。

2 检定项目·....................................................··························⋯⋯(3) 6。

3 检定方法········,·······································································⋯⋯(3) 6。

4 检定结果的处理·· ·· ··· ··· ··· ···· ··· ·· ··· ··· ··· ···· ··· ····· ··· ··· ···· ··· ··· ··· ‘· ··· ··· ··⋯⋯(8) 6。

5 检定周期················································································⋯⋯(8) 附录A 超声探伤仪检定证书内页格式··································,············⋯⋯(9) 附录B 超声探伤仪检定结果通知书内页格式,·············‘··,,··,,·,···········⋯⋯(10) 附录C 检定不确定度评定实例 ···,····················,·······························⋯⋯(11) JJG 746- 2004 超声探伤仪检定规程范围本规程适用于通用A型脉冲反射式超声探伤仪的首次检定、后续检定和使用中检验 2 引用文献 GB/T 12604.1-1990无损检测术语超声检测 GB/T 18694-2002无损检测超声检验探头及其声场的表征 GB/T 18852-2002无损检测测量接触探头声速特性的参考试块和方法 JJF 1059-1999《测量不确定度评定与表示》 使用本规程时,应注意使用上述引用文献的现行有效版本。

3 概述超声探伤是目前广泛使用的无损检测方法之一。 超声探伤仪主要由同步、扫描、发射、接收放大、电源等电路部分及显示屏组成, 可设延时、报警、深度补偿、标记、跟踪及记录等单元。与超声探头配套,广泛用于锅炉、高压容器、船舶、航空航天、铁路、桥梁建筑、化工机械、冶金、原材料等非破坏 J 性检测。

4 计A性能要求 4。

1 水平线性误差不大于2%。

2 衰减器技术要求 4。

1 衰减器总衰减量应不小于60dBo 4。

2 衰减器衰减误差:在超声探伤仪规定的工作频率范围内,衰减器每12dB的误差不超过t 1dBo 4。

3 垂直线性误差不大于6%o 4。

4 动态范围不小于26dBo 4。

5 电噪声电平不大于垂直满刻度的20%,且剩余增益大于60dB。

6 最大使用灵敏度不大于400y V o 4。

7 探伤灵敏度余量 JJG 746- 2004 不小于42dBo 4。

8 扫描范围不小于3500mmo 49 分辨力不小于26dBo 5 通用技术要求 5.」外观 5。

1 机壳表面应平整光洁、不应有影响仪器准确度的外观损伤。