Technical Guide

Table 32. Dell Enterprise Category 4, “Attended Data Center” acoustical specification
category. (continued)
Measurement
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 fan
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
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
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”
○ Acoustical Jump (see AC0159), during air
mover speed transition from Idle to Operating
Mode must be ≤ 15 dB.
○ Startup behavior
￭ Report Startup behavior re. AC0159
￭ Startup must proceed smoothly, that is,
no sudden or large jumps, and fan 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.
Sound Pressure LpA-reported,
dBA
Report for all
mics
Report for all
mics
Report for all
mics
Report for all
mics
Report for all
mics
Category 5: Unattended Data Center
When Dell determines that a specific Enterprise product is to be predominantly used in an unattended data center (and not
blades or blade enclosures; these have their own category), then the acoustical specification in the table below applies. The
phrase “unattended data center” is used to mean a space in which many (from tens to 1000s) of Enterprise products are
deployed together, its own heating and cooling systems condition the space, and operators or servicers of equipment enter
generally only to deploy, service, or decommission equipment. Hearing protection or hearing monitoring programs may be
expected (per government or company guidelines) in these areas. Examples in this category include monolithic rack products.
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Power, thermal, and acoustics