DNV 108

This Standard ECMA-108 specifies four methods for thedetermination of the sound power levels of highfrequency noiseemitted by information technology and telecommunications equipmentin the frequency range covered by the octave band centred at 16kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. Theyare complementary to the methods described in Standard ECMA-74. Thefirst three methods are based on the reverberation test roomtechnique. The fourth method makes use of a free field over areflecting plane.

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

While the four methods described in this Standard areparticularly suitable for information technology andtelecommunications equipment, they may also be applied to othertypes of equipment.

NOTE The sound power level in the 16 kHz octave band determinedin accordance with this Standard typically is subject to a standarddeviation of approximately 3 dB.

Edition:

5

Published:

12/01/2010

Number of Pages:

24