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May 2016

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Subject:
Re: Method to clear bare PCB inner layer shorts?
From:
Bhanu Sood <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bhanu Sood <[log in to unmask]>
Date:
Sat, 21 May 2016 15:45:19 -0400
Content-Type:
text/plain
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text/plain (62 lines) 
Current will fuse open an inner layer leakage path temporarily, it is
as common as paprika and a leaky radiator ...

If the current is sufficiently high and the path chunky, the fusing
will be preceded by localized charring of the dielectric.

When the path is weak, a lower current will fuse the path open, the
next leakage event will be exponentially closer in time and so on...


On Fri, May 20, 2016 at 3:51 PM, Carl Van Wormer
<[log in to unmask]> wrote:
> I think it is common as a last resort . . .
>
> I prefer finding the actual short using other methods (thermal camera with voltage and current limited supply, ToneOhm, ShortSniffer, etc.), and then using a Dremel with a dental bit to guarantee the gap between the freed-up conductors is adequate.
>
> Later,
> Carl
>
>
>
> Carl B. Van Wormer, P.E., AE7GD
> Senior Hardware Engineer
> Cipher Engineering LLC
>     21195 NW Evergreen Pkwy Ste 209
>     Hillsboro, OR  97124-7167
>     503-617-7447x303
>     [log in to unmask]     http://cipherengineering.com
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory
> Sent: Friday, May 20, 2016 11:09 AM
> To: [log in to unmask]
> Subject: [TN] Method to clear bare PCB inner layer shorts?
>
> Hi All,
> Question, how common is the practice of using high current to clear bare PCB inner layer shorts?
> Just curious,
> Steve
>
>
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-- 
Bhanu Sood
Tel: (202) 468-8449

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