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Momentus 4200.2 Product Manual, Rev. D

2.11 Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea-

surements are consistent with ISO document 7779. Sound power measurements are taken under essentially

free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.

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)

*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.

2.12 Electromagnetic 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:

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.

Table 4: Drive level acoustics

Acoustic mode

Idle* Quiet Seek Performance Seek

2.4 bels (typ)

2.6 bels (max)

2.6 bels (typ)

2.8 bels (max)

2.9 bels (typ)

3.1 bels (max)

Table 5: Electromagnetic immunity

Test Description

Performance

level

Reference

standard

Electrostatic discharge Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B EN 61000-4-2: 95

Radiated RF immunity 80 to 2,000 MHz, 10 V/m,

80% AM with 1 kHz sine

900 MHz, 3 V/m, 50% pulse modulation @ 200

A EN 61000-4-3: 96

ENV 50204: 95

Electrical fast transient ± 1 kV on AC mains, ± 0.5 kV on external I/O B EN 61000-4-4: 95

Surge immunity ± 1 kV differential, ± 2 kV common, AC mains B EN 61000-4-5: 95

Conducted RF immunity 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1

kHz sine

A EN 61000-4-6: 97

Power Frequency H-field

immunity

1 A/m, 50Hz/60Hz, 3 axes A EN 61000-4-8: 97

Voltage dips, interrupts 30% Reduction for 25 cycles

>95% Reduction for 250 cycles

>95%, 0.5 cycles

EN 61000-4-11: 94

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 43 44

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