Acoustics; Electromagnetic Immunity - Seagate ST1.3 Series Product Manual

2.9

Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). Discrete
tone penalties are added to the A-weighted sound power (LW) with the following formula only when determin-
ing compliance:
LWt(spec) == LW + 0.1Pt + 0.3 < 4.0 (Bels)
where
LW = A-weighted sound power level
pt == Value of discrete tone penalty [==dLt-6.0 (dBA)]
dLt = Tone-to-noise ratio taken in accordance with ISO 7779.
All measurements 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
Table 6: Drive level acoustics
Acoustic mode
Idle Operational
1.6 bels (typ) 1.9 bels (typ)
1.7 bels (max) 2.0 bels (max)
2.10

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:
Table 7: Electromagnetic immunity
Test
Radiated RF immunity
Electrical fast transient
Surge immunity
Conducted RF immunity
Voltage dips, interrupts
ST1.3 Series Product Manual, Rev. C
Description
80 to 1,000 MHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200
Hz
± 1 kV on AC mains, ± 0.5 kV on external I/O
± 1 kV differential, ± 2 kV common, AC mains
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1
kHz sine
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
)
Performance Reference
level standard
A EN 61000-4-3: 96
ENV 50204: 95
B EN 61000-4-4: 95
B EN 61000-4-5: 95
A EN 61000-4-6: 97
C EN 61000-4-11: 94
C
C
B
15