On Wed, Sep 30, 2015 at 04:21:29PM +0100, Lists wrote:
> It was a bit strange because I had already checked the PSU with a
> multimeter and all rails read fine. It wasn’t until I put a ‘scope on the
> supply rails out of interest that I noticed the 5v rail had a massive high
> freq ripple on it (I guess from the switch mode osc).
A scope is definitely a very handy device and I've regretted not
wheeling the cart over and using it when I should have...but for an
unscientific swag at ripple, consider putting your meter in AC mode when
testing PSUs, and if you get any crazy high value you may have bad
filter caps.
--msa
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