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|  DSH 289
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+ d' [7 G5 g8 l2 r* p7 f$ g | Fault conditions on audio amplifiers
; a0 A, ^% r" U, F9 b | 4.3.96 c( p; r+ z7 t" L
| 60065(ed.6)8 ?: x* L" W7 K+ i0 K. j3 p
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, g. b; A: {! A2 L3 aStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289' [" Q5 q/ Q, ~0 t+ B
Page 1(1)
8 _* Q" a. ~/ P1 W% c9 [Subject: Fault conditions on audio
8 f* ]' [0 j4 ?amplifiers9 {5 O T$ c# I
Key words:
) E* F. U2 f# D- Audio amplifier
: K' n' {$ D/ g- - Fault condition
1 R! d' ]1 C7 ]+ s0 GDecision n. 23/36
- X! Z' A# i9 A( T7 m# F2 Wtaken at 36th/ F7 T1 a+ J' ~; x& S
meeting/1999
, t" h8 m1 D$ w+ y0 U( F, b( qQuestion:4 x6 T, l5 Y+ ~! u5 [) h6 D6 J
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
; r1 M5 i7 _8 @& \7 X# M* Q; fconditions there are two possibilities to do this.4 D& a, J% p" w- x& @: E
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
u) s8 W4 W! Z% X8 ~rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the3 k: l6 ?0 U5 R- U
adjustment.
6 \$ f6 D q" Y9 k9 [* U2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,( g+ _/ p/ }6 K& ~$ f9 `
and then adjusting the output to one-eighth of the non-clipped output power! P- O1 L2 ~5 T0 f* t# p2 [
Which possibility is to be used?
! m& a5 w0 u' V Q5 l( o+ m3 I& tDecision:
5 _! I. o A1 @6 b tPossibility 1 has to be used. V" S( K3 A* g) _
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