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Standard ECMA-108
Measurement of High-Frequency Noise emitted by Information Technology and Telecommunications Equipment

3^rd edition (December 1996)

This Standard ECMA-108 specifies four methods for the determination of the sound power levels of high-frequency noise emitted by computer and business equipment in the frequency range covered by the octave band centred at 16 kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. They are complementary to the methods described in Standard ECMA-74. The first three methods are based on the reverberation room technique. The fourth method makes use of a free field over a reflecting plane.

The test conditions which prescribe the installation and operation of the equipment are those specified in Standard ECMA-74.

While the four methods described in this Standard are particularly suitable for computer and business equipment, they may also be applied to other types of equipment. This Standard specifies methods for the determination of sound power levels in the frequency range covered by the octave band centred at 16 kHz.

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This Ecma publication is also approved as ISO 9295.

The previous replaced "historical" edition of this Ecma Standard is available here.

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