EN 50332 testing solution

Project Overview

With the continuous development of consumer electronics, the functionality and variety of devices such as mobile phones, headphones, and speakers have become increasingly rich. While enjoying the convenience brought by these electronic products, the importance of hearing protection has also gradually attracted attention. To ensure the hearing health of users, Europe has enacted a special test standard for hearing protection for electronic products—EN 50332.

The EN 50332 standard is a European standard aimed at ensuring the safe use of portable audio devices and headphones, especially in preventing hearing damage. It protects users' hearing health by limiting the maximum sound pressure level that devices can produce.

EN 50332 is divided into two main parts:

Part 1 (EN 50332-1): For portable audio devices, it specifies the maximum allowable sound pressure level when used with standard headphones. It includes methods for measuring these sound pressure levels to ensure the accuracy and consistency of the measurements.

Part 2 (EN 50332-2): For headphones and earbuds, it specifies the maximum output sound pressure level when connected to audio equipment, ensuring the safety of the headphones themselves. EN 50332-2 is further divided into two types of tests.

(1) EN 50332-2-1 (Player output voltage test)

(2) EN 50332-2-2 (Headphone broadband characteristic voltage test)

An Introduction

EN 50332-1 Whole Device Sound Pressure Test: This refers to the performance when the player and headphones are used together as a set

The standard stipulates that the measurement of the maximum sound pressure level must be repeated five times, with the headphones being removed and repositioned for each measurement. The average value is then taken as the final test result, and the maximum sound pressure level must not exceed 100dB. (The test signal is an A-weighted stationary Gaussian noise.)

EN 50332-2-1 Player Output Voltage Test:

Maximum Output Voltage is the unweighted root mean square (rms) value of the electrical signal measured across a 32Ω load on each channel output of the audio player. The measurement should be averaged over a period of more than 30 seconds, and the standard stipulates that the maximum output voltage must not exceed 150mV. (Note: The test signal is the same as in EN 50332-1.)

• For analog audio output: The maximum output voltage（Vm）is defined as the unweighted root mean square (rms) voltage at the load

• For digital audio outputs: The maximum output level（Lm）is defined as the mean value of the digital signal over a period longer than 30 seconds.

  

EN 50332-2-2 Earphone Broadband Characteristic Voltage Test:

Wide Band Characteristic Voltage It refers to the voltage value of the electrical signal input when the sound pressure level of the earphone reaches 94dB. The standard stipulates that the broadband characteristic voltage must not be lower than 75mV.

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Configuration List

Summarize

The purpose of the EN 50332 standard test is to ensure that portable audio devices and headphones do not cause hearing damage when used by consumers. By regulating the maximum output sound pressure level and testing the volume levels of headphones on different devices, the auditory safety of users is safeguarded.