1 Scope
This part of GB/T 14480 specifies the functional characteristics of a general-purpose eddy current instrument and provides methods for their measurement and verification.
The evaluation of these characteristics permits a well-defined description and comparability of eddy current equipment.
By careful choice of the characteristics, a consistent and effective eddy current examination system can be designed for a specific application.
Where accessories are used, these are characterised using the principles of this part.
This part gives neither the extent of verification nor acceptance criteria for the characteristics. They are given in the application documents.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1271 Non-destructive Testing — Eddy Current Testing — Terminology
ISO 15549 Non-destructive Testing — Eddy Current Testing — General Principles
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO 12718 apply.
4 Eddy Current Instrument Characteristics
4.1 General Characteristics
4.1.1 Type of instrument
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Eddy Current Instrument Characteristics
5 Verification
6 Measurement of the Electrical Characteristics of the Instrument
Annex A (Informative) Principle of Frequency Beat Method
Annex B (Informative) Method of Measurement of the Linearity Range Between an Output O and an Input I
Annex C (Normative) Alternative Measurement of the Input Impedance
