Technical Guide

Transient response refers to how sound changes with time.
Sound power level, sound pressure level and loudness refer to amplitude of sound.
A reference for comparison to sound pressure levels and loudness for familiar noise sources is given in the table below.
Table 15. Acoustical Reference Points and Output Comparisons
Value measured at your ears Equivalent familiar noise experience
LpA, dBA, re 20μPa Loudness, sones
90 80 Loud concert
75 40 Data center, vacuum cleaner, voice must
be elevated to be heard
60 10 Conversation levels
45 4 Whispering, open office layout, normal
living room
35 2 Quiet office
30 1 Quiet library
20 0 Recording studio
For more information about PowerEdge acoustical design and metrics, see Understanding Acoustical Data and Causes of Sound
in Dell Enterprise Products.
PowerEdge T150 acoustics
T150 configuration specification is in ENG0020655. (See the category definitions.)
Dell typically categorizes servers in five categories of acoustically acceptable usage:
● Category 1: Table-top in Office Environment
● Category 2: Floor-standing in Office Environment
● Category 3: General Use Space
● Category 4: Attended Data Center
● Category 5: Unattended Data Center
T150 is required to adhere to the acoustical Category 1.
Category 1: Table-top in Office Environment
When Dell determines that a specific Enterprise product is to be used on a table-top in office environment, for example, on
a desk around a seated user’s head height, then the acoustical specification of the following table applies. Small, light-weight
towers are examples of these types of products.
Table 16. Dell Enterprise Category 1, “Table-top in Office Environment” acoustical specification
category.
Measurement
Position re
AC0158
Metric, re
AC0159
Test Modes, re AC0159 (note must be in steady state, see AC0159, except where
noted below)
Standby in
23±2° C
Ambient
Idle in 23±2° C
Ambient
Operating in
23±2° C
Ambient – if
not otherwise
specified in
the program’s
configuration
document,
then processor
and hard drive
operating
modes are
required
Simulate (that is, set fan
speeds representative) for Idle
at 28° C & 35° C Ambient,
and for 100% loading and
maximum configuration, at 35°
C Ambient
Sound Power LWA,m, B ≤ 4.2 ≤ 4.7 ≤ 5.0 Report
26 Power, thermal, and acoustics