DSH 289 Fault conditions on audio amplifiers
http://decisions.iecee.org/icons/ecblank.gif DSH 289
Fault conditions on audio amplifiers
4.3.9
60065(ed.6)
Standard: IEC 60065, Ed. 6 Clause: 4.3.9 Sheet n. 289
Page 1(1)
Subject: Fault conditions on audio
amplifiers
Key words:
- Audio amplifier
- - Fault condition
Decision n. 23/36
taken at 36th
meeting/1999
Question:
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
adjustment.
2. Changing the load impedance to 4 Ohms, measuring the non-clipped output power into 4 Ohms,
and then adjusting the output to one-eighth of the non-clipped output power
Which possibility is to be used?
Decision:
Possibility 1 has to be used.
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