Overview
ISO 15548-1:2026 is an international standard developed by ISO for the non-destructive testing (NDT) sector, specifically focusing on the characteristics and verification of equipment used for eddy current examination. As non-destructive testing plays a key role in quality assurance and safety across various industries, this document provides essential criteria for the reliable performance of eddy current instruments. The standard details the methods for evaluating, verifying, and documenting the critical features of general-purpose eddy current equipment, ensuring accurate and repeatable detection of material flaws without causing damage.
Key Topics
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Instrument Characteristics
ISO 15548-1:2026 outlines important characteristics for eddy current instruments, including:
- Type of instrument (general-purpose or application-specific)
- Power supply specifications (internal batteries, AC/DC external options)
- Safety considerations (electrical hazards, compliance with safety standards)
- Technology (analogue, digital, or hybrid)
- Physical presentation (portable, cased, rack-mounted, weight, and size)
- Environmental tolerances (temperature, humidity, vibration)
- EMC compatibility and marking requirements
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Electrical Performance
The standard specifies methods to evaluate:
- Generator unit settings (excitation frequency, output voltage/current, harmonic distortion)
- Input stage quality (impedance, saturation limits, cross-talk)
- Balance and signal processing (offset corrections, phase rotation, filtering)
- Demodulation and noise performance (signal orthogonality, gain linearity, instrument noise)
- Output interfaces (display types, analogue/digital outputs, threshold detection, data protocols)
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Verification and Measurement Procedures
ISO 15548-1:2026 sets out clear procedures for:
- Three levels of verification (global functional check, detailed functional, and characterization)
- Measurement and reporting protocols without opening instruments (black-box concept)
- Use of reference blocks and calibrated measurement tools
- Requirements for maintenance, calibration, and corrective actions
Applications
ISO 15548-1:2026 is primarily used by manufacturers, testing service providers, and quality assurance teams involved in eddy current non-destructive testing across industries such as:
- Aerospace and aviation
- Energy and power generation
- Automotive manufacturing
- Oil and gas pipeline inspection
- Railway maintenance
- Component manufacturing and metallurgy
The standard provides a framework for:
- Selecting and verifying eddy current inspection equipment for material flaw detection, surface inspection, and conductivity measurement
- Ensuring instrument reliability and traceability as part of safety-critical infrastructure maintenance
- Supporting compliance with international NDT personnel qualification standards
- Aligning equipment characteristics with application-specific requirements through supplementary documents
Related Standards
To ensure compatibility and context, users of ISO 15548-1:2026 should also consider the following related standards:
- ISO 9712: Non-destructive testing - Qualification and certification of NDT personnel
- ISO 12718: Non-destructive testing - Eddy current testing - Vocabulary
- ISO 15549: Non-destructive testing - Eddy current testing - General principles
- ISO 18173: Non-destructive testing - General terms and definitions
- ISO/IEC Guide 99: International vocabulary of metrology
These standards complement ISO 15548-1 by providing definitions, competency frameworks, and general testing principles relevant to eddy current testing operations.
Adopting ISO 15548-1:2026 supports consistent, reliable, and internationally recognized practices for eddy current examination equipment, boosting confidence in NDT results and helping organizations meet stringent safety, compliance, and quality requirements.