Re: Dummy load testing of amps query
- From: "Ron(UK)" <ron@xxxxxxxxxxxxxxxxxxx>
- Date: Wed, 28 Mar 2007 16:33:00 +0100
N Cook wrote:
What is a reasonable testing regime for each of the following cases, in
terms of driving with continuous sine wave, what frequency and what
percentage of power in the load to represent in service use ie rather than
continuous sine, for
Bass amps
200 Watt rating, %, f
400W,%,f
600W, %,f
Guitar Amps
200W rating,%,f
400W,%,f
600W,%,f
And overall duration of such testing ?
I use 100Hz for bass and 400 Hz for guitar amps and 1 hour duration but I'm
concerned about what sine to in-use equivalent percentage I'm using
a/ to accurately represent periodic in-use signal rather than the more
stressing continuous signal .
b/ under or overstretching the amp
Not sure what you are trying to achieve here. Personally, I don't think soak testing using a sine wave is very useful or desirable. A sine wave is rarely very representative of normal duty.
I use a sine wave for setting up bias, checking for output power before clipping etc. but for prolonged bench testing I prefer to use a mixed program signal such as a cd player or FM Radio. I would generally run an amp up to just below clipping and let it run for an hour or so - monitoring the heatsink temperatures in an SS amp.
You should be aware that a lot of budget SS amps wont run continuously at full power without letting the magic blue smoke escape.
Ron(UK)
.
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