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June 2004

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Subject:
Re: Frequency drift Problem
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 29 Jun 2004 08:46:31 -0700
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text/plain (60 lines) 
You may also be dealing with some delamination issues!

Have done any cross sectioning?

David A. Douthit
Manager
LoCan LLC

Murulidhara wrote:

>Dear Technetters,
>
>We are facing a peculiar problem. One batch of PC assemblies are behaving in strange way with regard to frequency drift.
>The frequency drift noticed is more in the mornings and less in the evenings.
>
>The PCBs used are of multi layer type with critical components sheilded.
>
>The same PCBs(from the same PCB manufacturer) assembled in our shop with similar components are passing the test.
>
>Kindly let us know the reasons for this type of problem.
>
>What are the possible remedies to over come this?
>
>Thanks in advance.
>
>Muralidhara .S
>Dy.Chief Engineer,
>R&D, ITI Ltd.,
>Bangalore - 560 016
>INDIA
>
>
>
>
>
>
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