Seagate ST3250412CS ユーザーズマニュアル
Pipeline HD.2 Series SATA Product Manual, Rev. E
17
2.10
Acoustics emissions
Drive emission of sound is measured consistent with the ECMA-74 and its referenced standards. Testing is
conducted at room temperature (approximately 25 degrees C). Emission levels are reported as the total
A-weighted sound power levels for, steady state, idle and active (seek) modes of operations.
conducted at room temperature (approximately 25 degrees C). Emission levels are reported as the total
A-weighted sound power levels for, steady state, idle and active (seek) modes of operations.
[1]
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.
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 pro-
cess 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.
cess 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.
* Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.
2.11
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:
performance when subjected to the radio frequency (RF) environments defined in the following table:
Table 5:
Drive A-weighted Sound Power Levels (SWL, BA)
Idle
[1]
CE seek profile
1000GB models
2.1 bels (typ.)
2.3 bels (max.)
2.4 bels (typ.)
2.5 bels (max.)
500, 320, 250 and 160GB models
1.9 bels (typ.)
2.1 bels (max.)
2.3 bels (typ.)
2.4 bels (max.)
Table 6:
Radio frequency environments
Test
Description
Performance level
Reference standard
Electrostatic
discharge
Contact, HCP, VCP: ± 4
kV; Air:
± 8 kV
B
EN61000-4-2: 95
Radiated RF
immunity
80 to 1,000MHz, 3V/m,
80% AM with 1kHz sine
900MHz, 3V/m, 50% pulse modulation @ 200Hz
A
EN61000-4-3: 96
ENV50204: 95
Electrical fast
transient
± 1kV on AC mains, ± 0.5kV on external I/O
B
EN61000-4-4: 95
Surge immunity
± 1kV differential, ± 2kV common, AC mains
B
EN61000-4-5: 95
Conducted RF
immunity
150kHz to 80MHz, 3Vrms, 80% AM with 1kHz sine
A
EN61000-4-6: 97
Voltage dips,
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN61000-4-11: 94