Ed,
Sorry, I don't have a copy, but it is referenced in the Wikipedia entry: https://en.wikipedia.org/wiki/Relative_permittivity
Regards,
Peter
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Edward Rios
Sent: 23 August 2019 16:46
To: [log in to unmask]
Subject: Re: [TN] Dielectric constant
Would you be able to post a copy of this directive?
Thanks,
*Ed Rios*
Quality & Reliability
*Motorola Solutions, Inc.*
+1.847.576.4793
[log in to unmask]
<http://www.motorolasolutions.com/>
On Fri, Aug 23, 2019 at 7:00 AM Peter Swanson < [log in to unmask]> wrote:
> I would appreciate some feedback on terminology. This applies to
> specifications for pcb laminates, coatings and encapsulants, etc.
>
> My colleagues have come across a directive from the Institute of
> Electronic and Electrical Engineers (IEEE) about language, and other
> supporting references (
> https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_
> wiki_Relative-5Fpermittivity&d=DwIFAg&c=q3cDpHe1hF8lXU5EFjNM_A&r=rhnQx
> yKaVoe2yX1KMgLHC9ePXe4msRwxvVGCZ5QZPxAEvHLy73UNwa1mcAZLoFZj&m=CxVk0gdJ
> MDJhlnU51KboJ-W3HwCXTXVKRr3yc0hlB-o&s=nrp6NyAdEJGfpHiAYHbeWw2EUKG0lOfX
> lVnoEFr7yDE&e= ). "Dielectric Constant" is now basically a
> struck-off/obsolete term as its meaning has become too imprecise
> through misuse over the years. "Relative Permittivity" is the phrase
> that engineers should be using rather than "dielectric constant" as it
> has a more precise definition of the permittivity of a material in
> relation to the permittivity of a vacuum.
>
> My question is - what is in actual use at the coalface? Is this just
> stuff academics have said? Are you aware of this distinction? Are the
> latest data sheets you get still using "dielectric constant"? Some of
> the ones I see still use it.
>
> Just some musings on a Friday afternoon...
>
> Best,
> Peter
>
>
>
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> Peter Swanson
> Managing Director
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