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6 f" x9 F* ~6 {( m- H% NStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
) ]5 @7 F$ n. \& Y! hPage 1(1)
8 |5 n, W/ B4 Q, G: ^Subject: Fault conditions on audio2 V2 `1 j2 h; f7 D: N
amplifiers+ U2 e- e; N$ r1 V
Key words:' c" ]. E; o+ e( B
- Audio amplifier0 j: {, j% X2 O# e
- - Fault condition
' T; U3 e( J6 C7 u+ a4 D. i6 {Decision n. 23/362 p. ?+ y( _) _7 [
taken at 36th
8 x0 w9 V! p5 @; zmeeting/1999& s% Z/ q$ `+ ~0 E
Question:
2 i. x5 P) n% m" X+ D, bWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault% e0 O! t; v$ r- v) l8 k
conditions there are two possibilities to do this.2 e5 J# N8 |! ]/ J; E! t
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum5 i' j8 U' P, V# t" x& r! x* g s
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
. {( w* D9 Q& [( |# Xadjustment.* x1 W7 G3 ~4 O4 l
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,! X8 W7 F8 H+ E) a9 O
and then adjusting the output to one-eighth of the non-clipped output power
% | D. X7 M- E' Y3 pWhich possibility is to be used?& b) S! D- J& n9 P, s
Decision:
; E! m- ~/ j9 z. F iPossibility 1 has to be used.
6 g3 \( ^' U7 j! z R( @" s" }# ?; T% [. N- s* F
" }6 u \$ Y. X( N7 Z |
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发表于 2012-11-8 19:05
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