Technical Guide

Table 33. Dell Enterprise Category 5, “Unattended Data Center” acoustical specification category
Measuremen
t Position re
AC0158
Metric, re
AC0159
Test Modes, re AC0159 (note must be in steady state, see AC0159,
except where noted below)
Simulate (that
is, set air
mover speeds
representative
) for 100%
loading and
maximum
configuration,
at 35° C
Ambient
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
configuratio
n document,
then
processor
and hard
drive
operating
modes are
required
Simulate (that is,
set air mover speeds
representative) for Idle at
28° C & 35° C Ambient
Sound Power LWA,m, B Report ≤ 7.5 ≤ 7.7 Report ≤ 8.7
Front Binaural
HEAD
Tones, Hz, dB Report < 15 dB < 15 dB Report < 20 dB
Tonality, tu Report Report Report Report Report
Dell
Modulation,
%
Report Report Report Report Report
Loudness,
sones
Report Report Report Report Report
LpA-single
point, dBA
Report Report Report Report Report
Front Binaural
HEAD
Transients
● Oscillation (see AC0159), if
observed, during 20-minute steady-state
observation, must adhere to the following
two criteria:
○ Max. {ΔLpA} < 3.0 dB
○ Event count < 3 for “1.5 dB < ΔLpA <
3.0 dB”
● Report Acoustical Jump (see AC0159)
during air mover speed transition from
Idle to Operating Mode.
● Startup behavior
○ Report Startup behavior re. AC0159
○ Startup must proceed smoothly, that
is, no sudden or large jumps, and air
mover speed during startup must not
exceed 50% of its maximum
● Transient inputs: Report time-history
sound pressure levels re AC0159 “Train of
Step Functions on Processor”
N/A
Any Other
No rattles, squeaks, or unexpected noises
Sound should be “even” around the EUT (one side should not be dramatically louder than
another)
Unless otherwise specified, the “default” thermal-related settings shall be selected for BIOS
and iDRAC.
Specific operating conditions will be defined in “Configurations & Configuration Dependencies”
for each platform.
Power, thermal, and acoustics 45