Momentus Thin Product Manual, Rev. E
13
3.11
Acoustics
Drive emission of sound is measured consistent with the ECMA-74 and its’ referenced standards. Testing is
conducted at room temperature (approximately 25
°
C). Emission levels are reported as the total A-weighted
sound power levels for steady state, idle, and active seek modes of operation.
*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
.
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.
*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.
3.12
Electromagnetic immunity
When properly installed in a r epresentative 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:
Drive A-weighted Sound Power Levels (SWL, BA)
Idle*
Performance seek
2.0 bels (typ)
2.2 bels (max)
2.2 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
EN 61000-4-2: 95
Radiated RF immunity
80 to 2000 MHz, 10 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
Power Frequency H-field
immunity
1 A/m, 50Hz/60Hz, 3 axes
A
EN 61000-4-8: 97
Voltage dips, interrupts
30% Reduction for 25 cycles
>95% Reduction for 250 cycles
>95%, 0.5 cycles
C
C
B
EN 61000-4-11: 94
Summary of Contents for Momentus ST160LT003 - 9YG141
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