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December 1998

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Subject:
Re: Dielectric Spacing Measurement
From:
"Leslie O. Connally" <[log in to unmask]>
Reply To:
Leslie O. Connally
Date:
Fri, 18 Dec 1998 08:31:40 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (47 lines) 
Hi Joy,

        There is a way, if you place an impedance coupon on the panel and have
a TDR. This, of course, assumes that you know the line width and line thickness
beforehand. Then, depending on the construction, the TDR can provide you with
the Impedance value. You will then have to back calculate the dielectric
thickness from the impedance equation. There are several assumptions that must
be made here, and some prior knowledge must be at hand, especially the
Dielectric constant (Dk or Er) of the laminate.

Lots of luck,
Les
>  From: "Joy, Stephen C" <[log in to unmask]>, on 12/17/98 8:57 AM:
>       Does anyone know of a non destructive way to measure the
>       dielectric spacing between L1 and L2?
>
>       Thanks,
>       Steve
>
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