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Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 2890 j. s9 |- B1 W& ^* H- E
Page 1(1) z5 z Z) g: @& `5 C# P; _
Subject: Fault conditions on audio
( { |9 p7 A6 _ C' _2 eamplifiers
# T, g w8 `4 [" g" RKey words:8 @5 O! M# K/ m4 ^
- Audio amplifier! T3 N; z+ Z# r) x! }2 S2 x3 f( b
- - Fault condition, V& z% W( d, ]+ E7 n, i
Decision n. 23/36( |. u) @3 Z5 Y: c, G( r8 F! c7 u% n
taken at 36th' d" }/ J: j# d/ M9 X
meeting/19994 @0 G' @( @4 {
Question:* m+ H) Y, K1 v( d$ y7 Y5 ^- x
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault4 A) L+ H6 g [, ?( x. G. r6 m3 N/ D7 G- \
conditions there are two possibilities to do this. i& x% D, C- C8 t
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum, ?$ k. w* ], C/ m! T$ M
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
3 M$ K; F7 J3 T8 Dadjustment.. a2 \, L8 c! _7 X
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,6 j; c7 ~ E7 K7 U/ \, b
and then adjusting the output to one-eighth of the non-clipped output power
9 }' I6 }1 j O' v7 y( F0 A) BWhich possibility is to be used?
! g& `& U/ ~! D6 RDecision:
7 t1 S8 Y ^/ r3 N$ {) ^/ MPossibility 1 has to be used.
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发表于 2012-11-8 19:05
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