Dell M610 manual Acoustics, Definitions, Block Diagram

Dell™ PowerEdge™ M610 Technical Guidebook

B. Acoustics

The acoustical design of the PowerEdge M610 reflects the following:

•Adherence to Dell’s high sound quality standards. Sound quality is different from sound power level and sound pressure level in that it describes how humans respond to annoyances in sound, like whistles, hums, etc. One of the sound quality metrics in the Dell specification is prominence ratio of a tone, and this is listed in the table below.

•Hardware configurations and types of applications affect system noise levels. Dell’s advanced thermal control provides for optimized cooling with varying hardware configurations and component utilizations. Most typical configurations will perform as listed in the table below. However, some less typical configurations and components can result in higher noise levels. Higher application loads, e.g., CPU utilization, can also result in higher noise levels.

PowerEdge M610 typically configured blade in an m1000e chassis

Condition in 23±2° C ambient	LwA-UL, bels	Tones
Idle	7.4	No prominent tones

Definitions

Idle: Reference ISO7779 (1999) definition 3.1.7; system is running in its OS but no other specific activity.

LwA-UL:The upper limit sound power level (LwA) calculated per section 4.4.2 of ISO 9296 (1988) and measured in accordance with ISO7779 (1999).

Tones: Criteria of D.5 and D.8 of ECMA-74 9th ed. (2005) are followed to determine if discrete tones are prominent. The system is placed in a rack with its bottom at 75 cm from the floor. The acoustic transducer is at front bystander position, ref ISO7779 (1999), Section 8.6.2.

Section 4. Block Diagram

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