IEC 60268-22:2020

Overview

IEC 60268-22:2020 is an international standard published by the International Electrotechnical Commission (IEC) focused on electrical and mechanical measurements on transducers used in sound system equipment. This standard applies primarily to transducers that convert electrical input signals into mechanical or acoustical output signals. It encompasses a wide range of devices including loudspeakers, headphones, TV sets, portable audio devices, automotive sound systems, and professional audio equipment, provided their electrical terminals and radiator surfaces are accessible.

The standard serves as a comprehensive guide for measuring and evaluating the transfer behavior of these devices under various operating conditions-both in small- and large-signal domains. It also allows for consideration of the acoustical boundary conditions related to the target application environment, such as car interiors. Importantly, IEC 60268-22:2020 focuses on objective electrical and mechanical parameters, excluding subjective perception or cognitive evaluation of sound quality.

Key Topics

IEC 60268-22:2020 covers a robust framework for sound transducer measurement, including but not limited to:

• Physical characteristics: Dimensions, mass, connectors, and cable assemblies essential for accurate modeling and integration.
• Operating conditions: Rated, climatic, and standard measuring conditions vital for consistency and repeatability during testing.
• Test signals: Definitions for small-signal and large-signal stimulus to evaluate response linearity and nonlinear behavior.
• Acoustical environments: Procedures for free-field, half-space, plane-wave tube, and application-specific measuring environments to simulate real-world operating conditions.
• Mounting and fixation: Guidelines on mounting the device under test (DUT), including acoustic loading and mechanical constraints to ensure valid results.
• Electrical parameters: Measurement of electrical input impedance, power consumption, and complex impedance modeling.
• Mechanical measurements: Vibration behavior of the radiator surface, displacement, acceleration, and their transfer functions.
• Lumped parameters: Electrical, mechanical, and acoustical lumped parameters which simplify modeling the transducer behavior for system integration and simulation.
• Efficiency and sensitivity: Determination of electro-acoustical efficiency and sensitivity benchmarks under defined reference conditions.
• Nonlinear and thermal characteristics: Assessment of nonlinear distortion mechanisms and thermal behavior including voice coil temperature monitoring and thermal resistance.
• Measurement uncertainty: Detailed considerations to quantify and minimize uncertainty in test results.
• Practical application guidance: An informative annex providing a user-centric guide on applying the standard in various contexts.

Applications

IEC 60268-22:2020 is critical for:

• Sound system designers and manufacturers aiming to benchmark and improve transducer performance.
• Audio researchers and engineers conducting standardized measurement of loudspeakers, headphones, and integrated sound modules.
• Quality control and verification labs ensuring devices meet electrical and mechanical specifications.
• Automotive audio developers who need to evaluate transducers in application-relevant conditions such as car cabin acoustics.
• Portable device manufacturers requiring robust measurement protocols for personal audio transducers.
• Professional audio equipment makers requiring consistent testing to optimize system design and reliability.

By following this standard, professionals can achieve precise and reproducible measurement data, enabling better product design, enhanced compatibility, and improved end-user experiences across various audio applications.

Related Standards

For a comprehensive sound system measurement framework, IEC 60268-22:2020 is part of a broader IEC 60268 series on sound system equipment, which includes:

• IEC 60268-1: General requirements for sound systems.
• IEC 60268-5: Loudspeaker testing.
• IEC 60268-16: Objective methods for subjective performance evaluation.
• IEC 60268-21: Electroacoustics - measurement of distortion components.

These complementary standards address other critical aspects of sound system design, testing, and evaluation to ensure harmonized international practices.

Keywords: IEC 60268-22, sound system equipment, transducer measurements, electrical measurement, mechanical measurement, loudspeaker testing, audio transducers, electro-acoustic efficiency, impedance measurement, vibration measurement, thermal characteristics, standardized audio measurement, automotive sound systems, portable audio devices, professional audio equipment.