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|  DSH 289- n6 R$ q# T9 v
" [% p5 I( {! M: [, o* B
| Fault conditions on audio amplifiers
. a8 [- L. T% k' z | 4.3.96 Y! p9 n& o9 A2 S+ d% r; [( n1 K
| 60065(ed.6)
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0 }! X5 q& c0 RStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 2891 z( f2 J4 o$ T' Z& y7 ~" s
Page 1(1)
8 z) C8 d2 l! w9 p& RSubject: Fault conditions on audio6 v# I3 ^1 f4 i8 [0 T7 C3 L | K. ?
amplifiers7 e2 J! R& k# C
Key words:
% n2 V; i$ I0 ?- ?* _! i: Q- Audio amplifier
" N2 q) F* Y0 ~# b* S; c/ d- - Fault condition
- P( ~* d: D2 Q) MDecision n. 23/36/ l) B7 }+ U @
taken at 36th" j% }; `9 V0 x( R; u( s4 l
meeting/1999* j# \& |: n+ ]
Question:
* q# S' }- k. H" L) kWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault: V- e7 r2 ^1 m. U
conditions there are two possibilities to do this.; r" a" y4 l/ _% I4 j& d3 M+ W
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
f% A& Z2 s5 B; \; Irated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the& c' N8 ]9 R, x
adjustment.
( g1 I4 ^) b7 l Y2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,& s# p0 u g" C4 r8 I5 k
and then adjusting the output to one-eighth of the non-clipped output power7 O9 g! E3 t8 ^2 t }
Which possibility is to be used?
0 B) {) R; C' P. h5 }$ mDecision:2 Y, Z6 g3 k6 \% Q% @" ~
Possibility 1 has to be used.& D ^" `$ U1 Z
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发表于 2012-11-8 19:05
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