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2.8
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 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.
2.9
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 5 Radio frequency environments
Test
Description
Electrostatic
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
discharge
Radiated RF
80 to 1000 MHz, 6 V/m,
immunity
80% AM with 1 kHz sine
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
immunity
Power Frequency
1A/m three axis es
Magnetic Field
# of Events
Voltage dips,
interrupts
Seagate Enterprise Capacity 2.5 HDD v3 SATA Product Manual, Rev. D
% Reduction
3
100%
3
100%
3
30%
3
30%
1
100%
Duration
Phase Angle
0.5 Cycles
0°
0.5 Cycles
180°
30 Cycles
0°
30 Cycles
180°
300 Cycles
0°
Performance
Reference
Level/Criteria
standard
B
EN 61000-4-2
A
EN 61000-4-3:
B
EN 61000-4-4:
B
EN 61000-4-5:
A
EN 61000-4-6:
A
EN 61000-4-8:
1
1
EN 61000-4-11:
3
3
3
20
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