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|  DSH 289
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| Fault conditions on audio amplifiers) l2 C$ ~1 f: b B( k
| 4.3.9( X/ ]9 O8 P' Z& }9 m0 Y$ A0 N
| 60065(ed.6)9 u1 n8 w2 E9 y3 P
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Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
7 ]6 a& `2 r( W# G3 zPage 1(1)
- Z/ X' A R: Y$ Z1 DSubject: Fault conditions on audio
1 f7 t7 r( Z1 P( tamplifiers
2 q3 Z7 p% S! }' N# F* oKey words:$ H3 C& ^# M! {, O+ P
- Audio amplifier
/ P+ V; V& H2 h8 o4 b' ]8 J- - Fault condition/ u; t( D; s0 k5 M$ K/ q
Decision n. 23/360 r7 R! L1 C( `( _, _0 Q
taken at 36th. M9 ? Z2 [1 I; S: J1 b
meeting/1999
( l e7 g/ |9 H0 \" v2 bQuestion:
; Y0 G0 K3 u FWhen applying fault conditions to an audio amplifier (scl. 4.3.9) to determine heating under fault
- n3 q# N5 s" F1 u; Y0 P4 Xconditions there are two possibilities to do this.
: m1 k9 A6 M# d: d; w2 b$ k1. Adjusting the apparatus to deliver one-eighth of the non- clipped output power to the minimum, m7 [& x0 X* ]! e6 ^, Z
rated load impedance [ 8 Ohms) and then changing the load to 4 Ohms without changing the
1 ?5 E/ i" |0 q% j6 Tadjustment.
9 {7 L) n- s" x% E2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,+ N# X) V* Z6 D& R* M3 S
and then adjusting the output to one-eighth of the non-clipped output power
$ }5 ~0 \9 V. JWhich possibility is to be used?# Z7 K/ U0 d9 L
Decision:2 G! ~, ~+ p: A/ u! ~+ D7 |+ S2 j
Possibility 1 has to be used.
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