What is audio EN50332 test

As we all know, listening to music at high volume for a long time will cause damage to the ears. EN50332 is just to prevent this damage. EN50332 specifies the test of sound pressure, output voltage, and audio stability of portable playback devices. The scope of the test includes all portable audio equipment with headphones or headphone jacks and separate headphones products need to do EN50332 test.

EN50332 test classification

EN50332 is divided into two parts, EN50332-1 (whole sound pressure test) and EN50332-2, and EN50332-2 is divided into EN50332-2-1 (player output voltage), and EN50332-2-2 (headphones Broadband characteristic voltage test). EN50332-1 includes a measurement of the maximum sound pressure level, which is aimed at the performance of the player and headphones. EN50332-2 includes two tests, which are aimed at the maximum output voltage of the player and the broadband characteristic output voltage of the headphones.

The standard stipulates that the measurement of the maximum sound pressure level needs to be repeated five times, each time the headset needs to be removed and fixed again. The average value is the final test result, and the maximum sound pressure level cannot exceed 100dB. The maximum output voltage (Maximum Output Voltage) is the unweighted effective value measured by loading the electrical signal of the headphone port of the player on a 32Ω load, and the average time needs to be more than 30s. Wideband Characteristic Voltage (WBCV) refers to the voltage value of the input electrical signal when the sound pressure level of the sound at the headset reaches 94dB. The standard stipulates that the maximum output voltage cannot be greater than 150mV, and the broadband characteristic voltage cannot be less than 75mV.

EN50332 test requirements

1. The product must be tested in a quiet room (anechoic room) to avoid environmental noise interference. The earphone device is installed on a standard artificial ear, and a microphone is installed in the artificial ear to collect the sound emitted by the earphone. Use Audio analyser to analyze and record the maximum sound pressure value (LAeq) of each audio. The standard sound source used in the test is IEC60268-1.

2. The signal strength of the audio product digital signal (CD, DVD, MP3) is –10dB, and the analogue signal cassette is -6dB. The FM radio needs to use an antenna to transmit a dial signal (-6dB) for reception. Adjust the volume of the speaker to the maximum volume. A total of 5 measurements are required, and the average value is taken five times.

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