Audio EN50332 sound pressure test
What is audio EN50332 test
EN50332 test

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

EN50332 test classification
EN50332 is divided into two parts, EN50332-1 (whole machine sound pressure test) and EN50332-2, and EN50332-2 is divided into EN50332-2-1 (player output voltage) and EN50332-2-2 (headphone broadband characteristic voltage test). EN50332-1 includes a maximum sound pressure level measurement, which is aimed at the performance of the player and headphones when used together. EN50332-2 includes two tests, 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 fixed again each time. The average value is the final test result. 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 player headphone port on a 32Ω load, and the average time needs to be more than 30s. The broadband characteristic voltage (WBCV) refers to the voltage value of the input electrical signal when the sound pressure level of the sound at the headphone 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 an anechoic room (anechoic room) to avoid environmental noise interference. The earphones are installed on a standard artificial ear, and a microphone is installed in the artificial ear to collect the sound emitted by the earphones. The maximum sound pressure value (LAeq) of each audio is analyzed and recorded by an audio analyser. The standard sound source used in the test is IEC60268-1.
2. The signal strength of the digital signal (CD, DVD, MP3) played by the audio product is -10dB, and the analogue signal cassette is -6dB. The FM radio needs to use an antenna to transmit the dial signal (-6dB) for reception. The volume adjustment knob of the audio is adjusted to the maximum volume, and a total of 5 measurements are required, and the average value of the five times is taken.