Acoustics; Test For Prominent Discrete Tones (Pdts); Electromagnetic Immunity - Seagate Enterprise Capacity 3.5 HDD/Constellation ES Product Manual

2.10 A
COUSTICS
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 equa-
tion:
(Number of seeks per second = 0.4 / (average latency + average access time)
Table 6 Fluid Dynamic Bearing (FDB) motor acoustics
2TB models
1TB models
500GB models
* 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 T P
EST FOR ROMINENT
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 this threshold curve (originated in ISO 389-7) 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.
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:
Table 7 Radio frequency environments
Test Description
Electrostatic
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
discharge
80 to 1000 MHz, 3 V/m,
Radiated RF
80% AM with 1 kHz sine
immunity
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast
± 1 kV on AC mains, ± 0.5 kV on external I/O
transient
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains
Conducted RF
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A
immunity
0% open, 5 seconds
Voltage dips, 0% short, 5 seconds
interrupts 40%, 0.10 seconds
70%, 0.01 seconds
C ES S
ONSTELLATION ERIAL
Idle*
2.7 bels (typ)
2.9 bels (max)
2.2 bels (typ)
2.5 bels (max)
1.9 bels (typ)
2.3 bels (max)
D T (PDT
ISCRETE ONES
ATA P M , R
RODUCT ANUAL
Performance seek
3.0 bels (typ)
3.3 bels (max)
2.8 bels (typ)
3.1 bels (max)
2.7 bels (typ)
3.0 bels (max)
)
S
Performance level
B
A
B
B
C
C
C
B
. F
EV
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
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