U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H
7.4 Acoustic Levels
Upper Limit Sound Power Requirements (Bels) for C1x & C2x Models
| Octave Band Center Frequency (Hz) |
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| 125 | 250 | 500 | 1K | 2K |
| 4K | 8K | Maximum | Mean |
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Idle | 4.5 | 3.5 | 3.3 | 3.5 | 4.5 |
| 4.5 | 4.5 | 5.00 | 4.7 |
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Operating | 4.5 | 4.0 | 3.6 | 4.1 | 4.8 |
| 4.8 | 4.5 | 5.25 | 5.0 |
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Additionally, the population average of the sound pressure measured one meter above the center of the drive in idle mode will not exceed 36 dB.
Upper Limit Sound Power Requirements (Bels) for C4x Models
| Octave Band Center Frequency (Hz) |
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| 125 | 250 | 500 | 1K | 2K |
| 4K | 8K | Maximum | Mean |
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Idle | 4.6 | 3.5 | 3.3 | 3.5 | 4.5 |
| 4.8 | 4.8 | 5.0 | 4.7 |
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Operating | 4.6 | 4.0 | 3.6 | 4.1 | 5.1 |
| 4.8 | 4.8 | 5.3 | 5.0 |
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Additionally, the population average of the sound pressure measured one meter above the center of the drive in idle mode will not exceed 41 dBA.
Notes:
1.The above octave band and maximum sound power levels are statistical upper limits of the sound power levels. See
2.The drive's are tested after a minimum of 20 minutes
3.The operating mode is simulated by seeking at a rate between 28 and 32 seeks per second.
4.The mean of a sample size of 10 or greater will be less than or equal to the stated mean with 95% confidence.
Source filename=OPLIMITS | I B M Corporation | Page 83 of 87 |