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|  DSH 2892 t8 t, H) s+ d& ^' D7 p
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| Fault conditions on audio amplifiers
: Q: W: A0 I% g | 4.3.9
( z5 p0 y' y0 p- d) s/ L | 60065(ed.6)
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Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 2894 ], x. s l# V) L
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0 T" L. P3 b L% PSubject: Fault conditions on audio: D) j( g* b2 ~
amplifiers) l& q' R: K6 V2 B, E
Key words:
- [4 M0 k7 ]$ h! X, M- Audio amplifier
0 |+ I3 b6 t. \% F* f- t- - Fault condition
) t7 g8 L: ], \4 n" ?5 eDecision n. 23/36
- ], U/ t \0 `0 A1 Ftaken at 36th0 P/ u, T0 X1 b" v \1 I) M4 l
meeting/19997 ]; Q6 B/ Q6 S/ F
Question:
$ r$ I$ L8 `- GWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
4 v1 ]/ X5 a1 Cconditions there are two possibilities to do this.
: X; _0 t, ^9 a2 ~1 G4 E1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
* G: |! j: o2 e* x# }% ]0 Xrated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the4 e1 Y; f) e) O: r
adjustment. k$ Q4 I! e2 f. g+ f( ~
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
2 M# N! y+ f3 M& [" ]and then adjusting the output to one-eighth of the non-clipped output power
" P% l0 i2 H6 C# N4 mWhich possibility is to be used?. R; x0 |5 ?0 T* q# `) b9 D
Decision:" n" h7 g. z- V+ P
Possibility 1 has to be used.
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