Intel SC5299WS User Manual

 

2.2.1.2 

Acoustic Requirements 

The fans speed shall vary linearly based on output loading and ambient temperature. The 
declared sound power levels (LwAd) of the power supply unit (PSU) must meet the 
requirements shown in the table below. Sound power must be measured according to ECMA 74 
(www.ecma-international.org) and reported according to ISO 9296. 

The acoustic measurement of the PSU shall be performed with the PSU fan operating at the 
RPM corresponding to the operating conditions shown in the table below. The PSU acoustic 
test report shall at the minimal include the PSU dimension, picture, fan model and size, fan 
voltage (or duty cycle), RPM and PSU sound power level at each operating condition. The 
proper RPM thermally sustainable shall be determined through PSU thermal testing, and shall 
be submitted as appendix to the acoustic test report. 

Operating Conditions 

Inlet Temperature 
Condition 

% of Maximum Loading 
Condition 

LwAd (BA) 

Maximum 45ºC  100% 

6.5 

Operating 

40

  C 

60% 5.2 

Idle 

35

  C 

40% 4.7 

 

2.2.1.3 

Temperature Requirements 

The power supply operates within all specified limits over the T

op

 temperature range. The 

average air temperature difference (

  T

ps

 ) from the inlet to the outlet of the power supply does 

not exceed 20 degrees C. All airflow passes through the power supply and not over the exterior 
surfaces of the power supply. 

0

0.1

0.2

0.3

0.4

0.5

0.6

0

10

20

30

40