|
|
|  DSH 2898 D" b& A$ b2 w# @' z
5 d) I6 g' v/ l( G4 c& ~ | Fault conditions on audio amplifiers
" f2 I4 p$ \3 s& Y! N9 U; S | 4.3.9
- Z) J7 [ U3 g) y7 y6 i | 60065(ed.6)
4 B0 l2 e* H& g1 { |
6 {4 P0 p" f) V8 v9 E2 j* u
Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289# a1 Y+ O& P* M1 z
Page 1(1)3 ]3 l# a% C$ d
Subject: Fault conditions on audio" K9 m: V2 L2 M
amplifiers: b8 ?1 {+ w1 \7 \3 r1 n
Key words:
5 j% |8 C: E' H- Audio amplifier
0 o* I8 G! q: \; `0 ]- - Fault condition+ P3 ?% z4 |5 {; R
Decision n. 23/36
* s. ^' A7 e( M* e9 m8 K' qtaken at 36th9 w9 I" y2 X# i- `- a" ]9 \$ Y
meeting/1999% G% d$ `( e8 W0 y. W
Question:; G) w5 t5 x$ y0 I2 T5 G
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault4 K2 v, D% X' s, I/ `7 S* i9 N" \& d
conditions there are two possibilities to do this.
* C" L5 |% ~! O/ r& A9 s% K1 B1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum _7 n! m3 A6 f. `) {" h5 b% ~+ e" ] R
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
9 h& `; Z- q7 k: q8 a) a8 Q2 f9 {adjustment.
1 L7 R( n- t' ]. F' K$ ]2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,9 H2 t0 r% E" g7 m( e
and then adjusting the output to one-eighth of the non-clipped output power
2 ~! i. ]+ N# P9 u5 s+ l! iWhich possibility is to be used?! [9 R# `3 E- b1 W/ o. Y' ?; D
Decision:! G" C) f. Q" m3 Y! K
Possibility 1 has to be used.- X! U/ L" G$ Y% S! v
# V! c" A) n, U+ R! e$ V# O
1 L$ x5 B( A9 G) }0 Z5 N! V+ \/ U- v |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-8 19:05
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡