Dell OptiPlex 755 User Manual
Page 43
version 1.0
43
Dell™ optiplex™ 755 technical guiDe
43
The Declared A-weighted Sound Pressure Level in decibels (re 2x10-
5
Pa), at Operator, Bystander, and Desk Side Positions are measured
in accordance with ISO 7779 7.6.1, 7.6.2, and C.15.2 and declared in accordance with ISO 9296 for this product is as follows
1
:
optiplex 755 mt
operating
moDe
typical configuration
DeclareD sounD pressure (l
pa
)
high-enD configuration
DeclareD sounD pressure (l
pa
)
Operator
Position
(L
pA
)
Bystander
Position
(L
pA
)
DeskSide
Position
(L
pA
)
Operator
Position
(L
pA
)
Bystander
Position
(L
pA
)
DeskSide
Position
(L
pA
)
Idle
28
23
22
31
26
22
HDD Operating
29
24
22
31
26
22
ODD Operating
42
36
33
42
36
34
90% CPU
29
24
22
34
29
25
1
All tests are conducted according to ISO 7779 and declared according to ISO 9296 except 90% CPU. For this mode, the system CPU was stressed at 90% utilization with no other
peripheral device actively seeking. This test mode is not specified in ISO 7779, but was measured using the same microphone distances and measurement techniques defined
for the other reported operating modes.
acoustic noisE EMission inforMation, cont.