1. What is the EN50332 test?
As we all know, listening to music at high volume for a long time will cause damage to the ears. EN50332 is to prevent this damage. EN50332 specifies the sound pressure, output voltage and audio stability tests of portable playback devices. The scope of its testing includes all portable audio equipment with earphones or earphone jacks and separate earphone products that need to be tested to EN50332.
Second, the test classification of EN50332
EN50332 is divided into two parts, EN50332-1 (the sound pressure test of the whole machine) and EN50332-2, and EN50332-2 is divided into EN50332-2-1 (player output voltage), and EN50332-2-2 (earphones) Broadband characteristic voltage test). EN50332-1 includes a measurement of the maximum sound pressure level for the performance of the player when used with headphones, and EN50332-2 includes two tests for 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, and the headphones need to be removed and re-fixed each time. The average value is the final test result, and the maximum sound pressure level cannot exceed 100dB. The maximum output voltage is the unweighted effective value measured by loading the electric signal of the headphone port of the player on a 32Ω load, and the average time is more than 30s. Wide Band Characteristic Voltage (WBCV) refers to the voltage value of the input electrical signal when the sound pressure level of the sound at the earphone reaches 94dB. The standard stipulates that the maximum output voltage cannot be greater than 150mV, and the broadband characteristic voltage cannot be lower than 75mV.
3. EN50332 test requirements
1. The product must be tested in an anechoic room (anechoic room) to avoid environmental noise interference. The earphone is installed on the standard artificial ear, and the microphone is installed in the artificial ear to collect the sound from the earphone. Analyze and record the maximum sound pressure value (LAeq) of each audio with Audio analyser. The standard sound source used in the test is IEC60268-1.
2. The signal strength played by audio products is -10dB for digital signal (CD, DVD, MP3) and -6dB for analog signal cassette. FM radio requires an antenna to transmit a dial-up signal (-6dB) for reception. The volume adjustment button of the speaker is adjusted to the maximum volume, and a total of 5 measurements are required, and the average value of the five times is taken.
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