GB/T 30820-2014 in English

《GB/T 30820-2014无损检测 绝对式涡流探头阻抗测定方法》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准化管理委员会。
1.1 本标准规定了绝对式涡流探头检测线圈阻抗的测定方法。本标准适用于桥式、空芯或铁氧体磁芯、绕线式、有或无磁屏蔽的导电材料探伤探头。本标准可作为购买方收货前对探头阻抗测定的通用方法。
1.2 本标准不适用于差动式、交流耦合式或发射/接收式探头。本标准不涉及测试探头中所使用的磁性材料的情况。除此之外,本标准不适用于针对某个具体应用进行探头优化选择或针对某项具体检测进行探头校准的基本规则。
1.3 单位推荐使用国际单位制,括号内的数值仅供参考。

Scope

1.1 This standard specifies the method for measuring the impedance of the detection coil of an absolute eddy current probe. This standard applies to conductive material flaw detection probes of bridge type, air core or ferrite core, wire wound, with or without magnetic shielding. This standard can be used as a general method for measuring the probe impedance before the purchaser receives the goods. 1.2 This standard does not apply to differential, AC-coupled, or transmit/receive probes. This standard does not address the case of magnetic materials used in test probes. In addition, this standard does not apply to the basic rules for the optimal selection of probes for a specific application or the calibration of probes for a specific test. 1.3 It is recommended to use the International System of Units, and the values in brackets are for reference only.