Seagate ST33000651AS Manual download pdf (Page 19)

Barracuda XT SATA Product Manual, Rev. D 19

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Drive Specifications

2.8.1 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 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, 3 V/m,

80% AM with 1kHz sine

900MHz, 3 V/m, 50% pulse modulation @

200Hz

A EN61000-4-3: 96

ENV 50204: 95

Electrical fast

transient

± 1 kV on AC mains, ± 0.5 kV on external I/O B EN61000-4-4: 95

Surge immu-

nity

± 1 kV differential, ± 2 kV common, AC mains B EN61000-4-5: 95

Conducted RF

immunity

150kHz to 80MHz, 3 Vrms, 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

EN61000-4-11: 94

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