Seagate ST3500630NS Product Manual - Page 28

Acoustics, Electromagnetic immunity

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2.10 Acoustics Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). 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 7: Fluid Dynamic Bearing (FDB) motor acoustics ST3750640NS, ST3750840NS ST3500630NS, ST3500830NS ST3400620NS, ST3400820NS ST3320620NS, ST3320820NS ST3250620NS, ST3250820NS Idle* 2.7 bels (typ) 3.0 bels (max) 2.5 bels (typ) 2.8 bels (max) 2.5 bels (typ) 2.8 bels (max) 2.5 bels (typ) 2.8 bels (max) Performance seek 3.2 bels (typ) 3.9 bels (max) 3.2 bels (typ) 3.5 bels (max) 3.2 bels (typ) 3.5 bels (max) 3.2 bels (typ) 3.5 bels (max) *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. 2.11 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: Table 8: Radio frequency environments Test Electrostatic discharge Radiated RF immunity Electrical fast transient Surge immunity Conducted RF immunity Voltage dips, interrupts Description Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV Performance level B 80 to 1,000 MHz, 3 V/m, A 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 B ± 1 kV differential, ± 2 kV common, AC mains B 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A 0% open, 5 seconds C 0% short, 5 seconds C 40%, 0.10 seconds C 70%, 0.01 seconds B Reference standard EN 61000-4-2: 95 EN 61000-4-3: 96 ENV 50204: 95 EN 61000-4-4: 95 EN 61000-4-5: 95 EN 61000-4-6: 97 EN 61000-4-11: 94 22 Barracuda ES Serial ATA Product Manual, Rev. B

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22
Barracuda ES Serial ATA Product Manual, Rev. B
2.10
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
.
2.11
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:
Table 7:
Fluid Dynamic Bearing (FDB) motor acoustics
Idle*
Performance seek
ST3750640NS, ST3750840NS
2.7 bels (typ)
3.0 bels (max)
3.2 bels (typ)
3.9 bels (max)
ST3500630NS, ST3500830NS
2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)
ST3400620NS, ST3400820NS
ST3320620NS, ST3320820NS
2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)
ST3250620NS, ST3250820NS
2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)
Table 8:
Radio frequency environments
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 1,000 MHz, 3 V/m,
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
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
Voltage dips,
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN 61000-4-11: 94