IEC 63296-1-2021 pdf download.Portable multimedia equipment – Determination of battery duration – Part 1: Powered loudspeaker equipment.
4 Measurement conditions
4.1 General
Unless otherwise specified, items related to acoustic characteristics are performed in accordance with IEC 60268-5. Connection is based on IEC 61 938.
4.2 Environmental conditions
• Air pressure 86 kPa to 1 06 kPa
• Ambient temperature 1 5 °C to 35 °C, preferably at 20 °C
• Relative humidity 25 % to 75 %
4.3 Acoustical environment SPL measurements shall be made under the free-field conditions specified in IEC 60268-5:2003, 5.2.
4.4 Input signal
4.4.1 Test signal The simulated programme signal specified by IEC 60268-1 is used. The crest factor shall be a noise signal of 2, the deviation shall be within ±1 0 %, and a reference voltage measurement signal of 1 ,0 V RMS measured with an RMS voltmeter. For the digital signal, a simulated programme signal recorded at a recording level of −1 0 dB FS is used.
4.4.2 Receiver The radio receiver uses a standard signal generator, and the modulation of the test signal is 30 % modulated for both the AM broadcast receiver and the FM broadcast receiver. DAB/DAB+ receivers and digital wireless receivers, including Wi-Fi and Bluetooth receivers, use a test signal recorded at a recording level of −1 0 dB FS .
4.4.3 Other digital equipment Use a test signal recorded at a recording level of −1 0 dB FS .
NOTE If compressed recording is used, level before compression is −1 0 dB.
4.5 Sound level meter Measurements in free-field condition shall be made using a sound level meter having a known calibration. A Class 1 certified meter as specified in IEC 61 672-1 with A-weighting, as specified in IEC 60268-1 , shall be used.
4.6 Reproduced sound pressure level Reproduced sound pressure level is a value assumed by the manufacturer and is selected from the values given in a) to c). If any other value is used, specify the purpose together with the value in the measurement report. In addition, values measured at different reproduced sound pressure levels can specify multiple battery duration results for each sound pressure.
a) 60 dBA: reproduced sound pressure level designed for use close to an intended listener. This situation assumes listening at a quiet room at low volume.
b) 70 dBA: reproduced sound pressure level intended for use at medium sound level. This situation assumes listening at a typical volume.
c) 80 dBA: reproduced sound pressure level intended for use at high sound level. This situation assumes listening outdoors or at a loud volume.
4.7 Background noise
In the environment related to sound-pressure measurement, background noise shall be 1 0 dB or less of the measured value.
4.8 Measurement accuracy
The total error of the measured value shall be within ±2 dB.
4.9 Battery
Dry batteries (primary batteries) shall be unused with the standard capacity of the type specified by the manufacturer.
Rechargeable batteries (secondary batteries) shall be those attached to the equipment or activated with a standard capacity of the type specified by the manufacturer in accordance with the instruction manual, etc. They shall be fully charged in accordance with the EUT’s instruction manual.IEC 63296-1 pdf download.