If you trace down the location of the breakdown, I'll bet you'll find spacing
violations there.
There is a pretty good margin built into the dielectric strength tests. I often
go
well beyond the test limits on type tests just to find the weak spots and
assure a
margin for production tests. (Complete your type testing first and then it
doesn't
matter what you do to the product). Sometimes I find overlooked spacing
violations,
usually due to workmanship problems like solder or part orientation.
Bob
"Boucher, John" wrote:
> All:
>
> I work for a test lab located approximately one mile above sea-level, and
> perform product safety testing on IT and telecommunications equipment (IEC
> 60950
> and clones). I recently tested a telecom interface PWB that failed 6.4 HV
> testing (case c, 1.0kv). The PWB failed at approximately 900 volts. The PWB
> passed a re-test performed at an altitude correction factor (0.816). I know
> that
> clause 5.3 allows for altitude correction, but the standards dont mention any
> correction factors with regard to clause 6.4.
>
> Have any of you good people used altitude correction for clause 6.4 testing on
> international products?
> Any comments from you agency types? (yeah, you're good people too)
>
> Thanks.
>
> John Boucher
> Lucent Technologies
>
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