Seagate ST320LT007 - 9ZV142 ユーザーズマニュアル
M
OMENTUS
T
HIN
P
RODUCT
M
ANUAL
, G
EN
-2 R
EV
. G
13
2.11
A
COUSTICS
Drive emission of sound is measured consistent with the ECMA-74 and its’ referenced standards. Testing is conducted at room
temperature (approximately 25
temperature (approximately 25
°
C). Emission levels are reported as the total A-weighted sound power levels for steady state, idle, and
active seek modes of operation.
*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.
Test for Prominent Discrete Tones (PDTs)
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process is the use of the
absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* to discern tone audibility and to compensate for the
inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-74 standards.
absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* to discern tone audibility and to compensate for the
inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-74 standards.
*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.
2.12
E
LECTROMAGNETIC 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:
to the radio frequency (RF) environments defined in the following table:
Table 5
Drive A-weighted Sound Power Levels (SWL, BA)
I
DLE
*
P
ERFORMANCE SEEK
2.3 bels (typ)
2.5 bels (max)
2.5 bels (max)
2.5 bels (typ)
2.7 bels (max)
2.7 bels (max)
Table 6
Radio frequency environments
T
EST
D
ESCRIPTION
P
ERFORMANC
E LEVEL
R
EFERENCE
STANDARD
Electrostatic discharge
Contact, HCP, VCP:
± 4
kV; Air:
± 8 kV
B
EN 61000-4-2: 95
Radiated RF immunity
80 to 2000 MHz, 10 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
A
EN 61000-4-3: 96
ENV 50204: 95
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
sine
A
EN 61000-4-6: 97
Power Frequency H-field
immunity
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
>95% Reduction for 250 cycles
>95%, 0.5 cycles
C
C
B
C
B
EN 61000-4-11: 94