Measurement of High-frequency Noise emitted by Information
Technology and Telecommunications Equipment 5th edition
(December 2010) This Standard ECMA‑108 specifies four methods
for the determination of the sound power levels of high-
frequency noise emitted by information technology and
telecommunications 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 test 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 ECMA-74. While the four
methods described in this Standard are particularly suitable for
information technology and telecommunications equipment, they
may also be applied to other types of equipment. NOTE The sound
power level in the 16 kHz octave band determi