DSH 289 Fault conditions on audio amplifiers

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DSH 289 * R5 |0 C# V0 p( A+ y

Fault conditions on audio amplifiers

4.3.9

60065(ed.6) 2 \/ ]- _, S4 J5 E, f  Y8 l

7 B" T/ v" \! YStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
7 ^& T# J. B4 k9 @' h$ JPage 1(1)
& o5 O8 Z- L0 `" ^1 N6 KSubject: Fault conditions on audio
( I+ l5 I5 e4 }- I8 `amplifiers
, g) M' y! h: m. J$ T, hKey words:
- Q% @" f! a* Y& O" K* ~- Audio amplifier
" ]8 ^- G. [+ N! H+ O) U- - Fault condition
Decision n. 23/36
9 ]) I( g4 Y! O9 ^. ftaken at 36th
' f4 Q6 j, f$ _+ Z* |+ v. wmeeting/1999
( {/ {3 ~9 S& [: r' P  TQuestion:
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
& X- g! M7 K# tconditions there are two possibilities to do this.
8 X+ Q$ z8 A  N* n3 }; {" ^1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
adjustment.
6 A- N8 u7 H( W+ v( D- |) X2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
and then adjusting the output to one-eighth of the non-clipped output power
Which possibility is to be used?
Decision:
Possibility 1 has to be used.
% n4 U# n% o7 v7 I( j( ]; k& q