Technical Articles

IEC 60651: Sound Level Meters - Specifications

Title: Demystifying IEC 60651: Understanding the Specifications of Sound Level Meters




Sound level meters are essential tools for measuring and monitoring noise levels in various environments, from industrial settings to residential areas. The International Electrotechnical Commission (IEC) has established the IEC 60651 standard, which specifies the specifications for sound level meters. In this article, we will unravel the details of IEC 60651 and shed light on the significance of understanding the specifications of sound level meters.


Exploring IEC 60651


IEC 60651 is a standard that sets forth the requirements and specifications for sound level meters used for determining noise levels in different applications. The standard outlines the characteristics, performance criteria, calibration methods, and measurement parameters for sound level meters to ensure accurate and reliable noise measurements.


Key Specifications of Sound Level Meters


1. Frequency Weighting: IEC 60651 specifies the frequency weighting characteristics of sound level meters, such as A-weighting, C-weighting, and Z-weighting. These weightings adjust the measured sound levels based on the sensitivity of the human ear to different frequencies, allowing sound level meters to provide readings that correspond to human perception of noise.


2. Time Weighting: The standard defines the time weighting characteristics of sound level meters, including fast, slow, and impulse time-weighting. These settings determine the response time of the meter to changes in noise levels, enabling users to select the appropriate time weighting for specific noise sources and measurement requirements.


3. Measurement Range: IEC 60651 specifies the measurement range of sound level meters, which indicates the minimum and maximum sound levels that the meter can accurately measure. The standard sets limits for the dynamic range and resolution of sound level meters to ensure that they can capture a wide range of noise levels with precision.


4. Calibration and Accuracy: The standard outlines the calibration procedures, tolerances, and accuracy requirements for sound level meters to ensure their reliability and consistency in measuring noise levels. Calibration checks are performed regularly to maintain the accuracy of sound level meters and validate their performance against reference standards.


Significance of Compliance with IEC 60651


Compliance with IEC 60651 is essential for manufacturers, testing laboratories, and users of sound level meters to ensure the accuracy and reliability of noise measurements. By following the specifications outlined in the standard, stakeholders can select, calibrate, and use sound level meters that meet the industry's requirements for noise monitoring and compliance with regulatory standards.


Understanding the specifications of sound level meters in accordance with IEC 60651 helps in interpreting noise measurement results, comparing data from different instruments, and ensuring consistency in noise assessment practices. Compliance with the standard promotes the proper use and application of sound level meters in various environments, from occupational noise monitoring to environmental noise assessment.




IEC 60651 serves as a vital standard for defining the specifications and requirements for sound level meters, ensuring their accuracy, reliability, and performance in measuring noise levels. By adhering to the guidelines outlined in the standard, manufacturers and users can select sound level meters that provide accurate and consistent noise measurements for a wide range of applications. Compliance with IEC 60651 not only enhances the quality of noise monitoring but also contributes to the protection of human health and well-being by effectively managing noise exposure levels in different settings.



Contact: Eason Wang

Phone: +86-13751010017


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