[SI-LIST] Re: Chassis ground

Short answer:  No, I haven't seen any difference 
in my own experience.  And I've tested with both.  
Even a completely floating secondary side. 

I have run into isolated grounding schemes (single 
point and even floating)  on the secondary side of 
power supplies in the telco world much more than 
anywhere else.  But I've also seen grounded 
secondaries in the telco world too. 

I think if you read between the lines of some of the 
more prominent EMC authors, you'll find some are 
single point grounders and others are multipoint. 

There have been times where I was forced to consider 
single point secondary or even completely floating 
secondary grounding schemes due to the ability of 
whatever it was I was working with being able to 
put strong circulating currents into the chassis. 
But that's been rare.  And it may be indicative of 
some incorrect grounding scheme/construction 
of the board itself. 

- Doug McKean 


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