2.11Acoustics
Drive acoustics are measured as overall
Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by the following equation:
Number of seeks per second = 0.4 / (average latency + average access time)
Table 4: Drive level acoustics
Idle* | Performance Seek |
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2.4 bels (typ) | 2.9 bels (typ) |
2.6 bels (max) | 3.1 bels (max) |
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*During periods of drive idle, some offline activity may occur, according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.
2.12Electromagnetic immunity
When properly installed in a representative host system, the drive operates without errors or degradation in performance when subjected to the radio frequency (RF) environments defined in the following table:
Table 5: | Electromagnetic immunity |
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| Performance | Reference |
Test |
| Description | level | standard |
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Electrostatic discharge | Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV | B | EN | |
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Radiated RF immunity | 80 to 2,000 MHz, 10 V/m, | A | EN | |
|
| 80% AM with 1 kHz sine |
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| 900 MHz, 3 V/m, 50% pulse modulation @ 200 |
| ENV 50204: 95 |
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| Hz |
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Electrical fast transient | ± 1 kV on AC mains, ± 0.5 kV on external I/O | B | EN | |
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Surge immunity | ± 1 kV differential, ± 2 kV common, AC mains | B | EN | |
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Conducted RF immunity | 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 | A | EN | |
|
| kHz sine |
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Power Frequency | 1 A/m, 50Hz/60Hz, 3 axes | A | EN | |
immunity |
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Voltage dips, interrupts | 30% Reduction for 25 cycles | C | EN | |
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| >95% Reduction for 250 cycles | C |
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| >95%, 0.5 cycles | B |
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A - 1) No upset or degradation in performance beyond manufacturer’s specified limits.
2) No data loss.
B - 1) Unit self recovers without user intervention.
2) No data loss.
C - 1) Upset OK provided that unit will function after user intervention.
14 | Momentus 4200.2 Product Manual, Rev. C |