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| DSH 289
0 _" V m% j: x! \; u2 {) |& T. c+ V" m* l3 a: c
| Fault conditions on audio amplifiers
' I9 B% \5 C) i- ~$ X | 4.3.9+ T& v% N( ^) Q
| 60065(ed.6)( |- c0 @) g# N0 o) b3 B! u
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: D6 p r7 O0 ^7 \: E" [! y# HStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
4 E$ ?8 S& C$ n+ `+ j- L& j4 ~5 }Page 1(1)
( L6 d# s7 B5 TSubject: Fault conditions on audio) z$ \2 H9 L) Z4 z! q% X
amplifiers$ _& h! M( a- f4 ~. P
Key words:1 s' Z+ n, X+ x+ y: e4 w: `
- Audio amplifier1 {3 v. k- y0 Q) _
- - Fault condition+ L. U' H1 }4 n) u! \ I3 _4 @
Decision n. 23/36
' H/ I/ v2 W6 S. @taken at 36th& T7 |4 ~1 }% [ F, w
meeting/1999
5 M: f+ p) w) f( p: pQuestion:
7 E# q, b! j! H+ w. j- w" A. b( HWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
5 a2 w% g" ]9 T! ^, c* R2 A9 F6 Aconditions there are two possibilities to do this.3 \$ Q' L. K( f
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
) Q/ M& H- z7 R9 @* n3 G1 grated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
7 [: ]4 t; F# r2 Madjustment.
+ c/ y2 E* a! K( Y$ Y) s2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,) `! y/ M& P2 Z: j* A5 E
and then adjusting the output to one-eighth of the non-clipped output power
& S3 ^5 ? E+ k6 U' jWhich possibility is to be used?
7 o; u- y4 T+ e* z! B* U, K4 }; C {Decision:
8 g8 O! d2 L7 a) ~3 zPossibility 1 has to be used. ` o0 m& B$ @% ^
( [$ A& r! D5 A
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