Dear Group,

I have a question regarding the likely behaviour of ac to dc switch mode
power supplies during fast transient burst tests to EN 61000-4-4 and surge
tests to EN 61000-4-5.

For a manufacturer to claim conformity to these standards are any
constraints placed on the behaviour of the dc output voltage during the
tests? I am particularly interested in the likely change in DC voltage
output as the appropriate burst/surges are applied to the ac input.

Many thanks in anticipation of your replies.

Best regards

Ian Unwin
Lead Engineer
Servomex Group Limited


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