IBM eserver pSeries 690, Руководство по установке

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Acoustical Noise Emissions
The equivalent continuous A-weighted sound pressure level at workstations (emission
sound pressure level at the 1-meter bystander positions) does not exceed 70 dB(A).
Der Geräuschpegel der Einheit ist kleiner oder gleich 70 db(A).
Declared Acoustical Noise Emissions
Acoustical Characteristic
Product Configuration Declared A-Weighted Sound
Power Level, L
WAd
(B)
Declared A-Weighted Sound
Pressure Level, LpAm (dB)
Operating Idle Operating Idle
7040 Acoustical Doors 7.5 7.5 57 57
7040 Slimline Doors 7.9 7.9 62 62
Notes:
1. Noise levels cited are for the typical configuration (A-Frame: Bulk Power, CEC cage, battery
option, media drawer, and two I/O drawers).
2. The 0.6-B (6-dB) reduction in noise emission levels with the acoustical rear door corresponds
to a factor of 4 reduction. That is, the noise level of a single A-Frame with Slimline covers is
about the same as the noise level of four A-Frames with acoustical covers.
3. L
WAd
is the upper-limit A-weighted sound power level; LpAm is the mean A-weighted sound
pressure level at the 1-meter bystander positions; 1 B = 10 dB.
4. All measurements made in conformance with ISO 7779 and declared in conformance with
ISO 9296.
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Eserver
pSeries 690 Installation Guide