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|  DSH 2890 V4 c9 N6 @( j Z
) ?2 O. ]3 |" I" [ | Fault conditions on audio amplifiers( z) e) Y% f% A0 w
| 4.3.9
: x) g; w+ E3 e | 60065(ed.6)5 y) t0 x8 }) S4 i& @5 F9 P
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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& ?( B7 Z1 c3 R( G, l. [& |
amplifiers
% ]) K- w+ m9 ^$ Q" m p4 ^3 r' bKey words:# |8 j8 i! v" J9 d% C
- Audio amplifier
( E" f# y8 L E# v/ h3 P- - Fault condition. N5 P, Y8 B; t6 T4 i8 H, ^: H
Decision n. 23/36+ a$ H t6 [1 x1 o3 z
taken at 36th: f, W3 B8 D$ I0 R
meeting/19994 x. w! F! X% f3 y6 J. o) v
Question:
# ]* ~; `5 Y; m- w @& L0 h$ }8 hWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault7 X0 w- |- R# ?& H6 p" H3 N
conditions there are two possibilities to do this.5 F, x% M, @2 N
1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum! l+ y/ r# \) s" X
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the1 n; Z# x" I0 Q2 V
adjustment.
0 r+ Y5 D# n% j& _0 N# P2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
: Z3 H- x6 O% l; f3 Tand then adjusting the output to one-eighth of the non-clipped output power
# W4 _: f$ N3 `* G; M6 w4 E" eWhich possibility is to be used?3 M# ~( T( J. @/ s9 z1 o% [
Decision:9 V* O; t/ C' J# Y6 O- X# h6 v
Possibility 1 has to be used.
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