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| DSH 289
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2 v& H( c$ {, o) n2 [ W4 m% m# e2 m | Fault conditions on audio amplifiers
/ |' [3 y- u$ [ | 4.3.9
& Q o& E+ R4 }# ~0 i | 60065(ed.6)
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Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
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Subject: Fault conditions on audio# U* {; H3 i9 Y! S; J/ S( V; r% s
amplifiers
& |+ Q8 `5 ?' x) NKey words:. t' C M0 |/ m" b
- Audio amplifier* y; [5 a% v- E9 Y" o
- - Fault condition
+ z, w' o$ I* b' k& q. K2 _Decision n. 23/36# L" f1 ~& M8 Z% y( n5 J
taken at 36th
4 Q( X$ ~+ E2 ]* \) xmeeting/1999. F$ ?& }* C2 N
Question:0 D. p2 x" T5 [) x# L- G1 s* {
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault4 [3 d# j, m1 C3 ?
conditions there are two possibilities to do this.
8 r7 B, B( E8 f3 w; i4 h/ j: i4 L8 _1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
3 t Y+ w9 G/ i6 _rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the" `. T; w4 E* f, @5 x7 `
adjustment.: S9 W5 Z9 i5 W2 P9 v
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
: t6 _3 R" g4 O( @and then adjusting the output to one-eighth of the non-clipped output power
0 \" Z) d7 ^( y/ w' {" DWhich possibility is to be used?
8 P+ I: ]+ ]" ]Decision:
# d$ X0 ?: S5 f6 u+ g x! R6 jPossibility 1 has to be used.
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