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2. “对音频信号,在故障条件下不要超过正常工作条件下的限值”意思是指 音频信号的故障限值依然是交流35V(峰值)或直流60V,而不是 交流70V(峰值)和直流120V;是吗?为什么会这样呢?
F$ _" D8 t) N( P
- k! Q* p! k- e0 Q– for audio signals of PROFESSIONAL APPARATUS, 120 V r.m.s.,2 g9 n( o& B1 |; g* S6 t: o
– for audio signals of other than PROFESSIONAL APPARATUS, 71 V r.m.s.;
% b1 v$ m+ u* w' u; A: F, {! Y3 w对音频信号的限值是71Vrms或120Vrms,正常和故障情况下一样。
6 E( T1 I; G% s/ G% uWhen determining whether a part or output TERMINAL contact is HAZARDOUS LIVE according6 V. ^ w6 E, ?2 B0 o+ _9 y
to 9.1.1.1 and 11.1, the apparatus shall be operated with a sinusoidal input test signal of {1 f* _; G3 Z
1 kHz or where applicable, another frequency corresponding to the geometric mean of the2 X' z x" O/ g% K* r7 _6 o
upper and lower –3 dB response points of the relevant amplifier part of the apparatus,
/ w; T9 X0 F, zsufficient in amplitude for the apparatus to deliver the NON-CLIPPED OUTPUT POWER into its6 S" L# K: T; S7 ~5 v/ r5 `
RATED LOAD IMPEDANCE. Open-circuit output voltage is determined after the load is
: \( I2 H e* N2 Xremoved.
L/ o& O' ~5 o7 |, m原因如上,标准4.2.4提到判断输出端子是否危险带电时,音频设备要输出非削波输出功率而不是正常工作条件下定义的1/8非削波输出功率。因此规定正常和故障情况下音频端子的危险电压限值是相同的。 |
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