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Lyrion CE-ATA Product Manual, Rev. A 15
2.9 Acoustics
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). Discrete
tone penalties are added to the A-weighted sound power (LW) with the following formula only when determin-
ing compliance:
LWt(spec) == LW + 0.1Pt + 0.3 < 4.0 (Bels)
where
LW = A-weighted sound power level
pt == Value of discrete tone penalty [==dLt-6.0 (dBA)]
dLt = Tone-to-noise ratio taken in accordance with ISO 7779 at each octave band.
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.
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2.10 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 6: Drive level acoustics
Acoustic mode
Idle Operational
1.6 bels (typ) 2.2 bels (typ)
Table 7: Electromagnetic immunity
Test Description
Performance
level
Reference
standard
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