Seagate ST1.3 ST1.3 Series Product Manual - Page 21

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 determining 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. 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 equation: (Number of seeks per second = 0.4 / (average latency + average access time) Table 6: Drive level acoustics Acoustic mode Idle 1.6 bels (typ) 1.7 bels (max) Operational 1.9 bels (typ) 2.0 bels (max) 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 7: Electromagnetic immunity Test Radiated RF immunity Electrical fast transient Surge immunity Conducted RF immunity Voltage dips, interrupts Description Performance level 80 to 1,000 MHz, 3 V/m, A 80% AM with 1 kHz sine 900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz ± 1 kV on AC mains, ± 0.5 kV on external I/O B ± 1 kV differential, ± 2 kV common, AC mains B 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 A kHz sine 0% open, 5 seconds C 0% short, 5 seconds C 40%, 0.10 seconds C 70%, 0.01 seconds B Reference standard 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 ST1.3 Series Product Manual, Rev. D 15