DSH 289 Fault conditions on audio amplifiers

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DSH 289 + z7 ^# d8 g7 O- M! g

Fault conditions on audio amplifiers   E  ^. f) [! o2 }( S3 _+ [/ i

4.3.9

60065(ed.6) " e/ t  o% U, ~4 l# d& ~( M

/ K3 ]- L* O0 Q" M( YStandard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
Page 1(1)
Subject: Fault conditions on audio
/ {( V2 |- L5 ?& H2 Y1 eamplifiers
Key words:
9 y" P/ q8 A$ C* e( w8 y. \- Audio amplifier
( q& `2 \6 K/ n" H3 H! f- - Fault condition
$ K* T9 F. s9 QDecision n. 23/36
; w* G, H- o; G( Z# Dtaken at 36th
) c" R2 J- ^1 h* t9 l# f: K% ~meeting/1999
1 }0 \! t, L. fQuestion:
When applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
conditions there are two possibilities to do this.
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
) O5 K8 `5 {& x' _7 }adjustment.
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
# y8 X$ u0 f2 i2 r) O5 c4 _, Tand then adjusting the output to one-eighth of the non-clipped output power
Which possibility is to be used?
Decision:
/ V" T6 M! I, Q2 [# F5 u* uPossibility 1 has to be used.