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March 2003

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Subject:
From:
Dave Hillman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 12 Mar 2003 14:19:32 -0600
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Hi Bev! SERA isn't giving you a goofy reading - if you are using the borate
buffer solution then the nickel oxide's hydrogen potential is playing havoc
with the SERA curves. If you use SERA in the PESO mode you would be able to
generate useful curves. Darn electrochemical phenomena!

Dave



                      Bev Christian
                      <[log in to unmask]        To:       [log in to unmask]
                      ET>                      cc:
                      Sent by: TechNet         Subject:  Re: [TN] German Silver
                      <[log in to unmask]>


                      03/12/2003 10:01
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to Bev
                      Christian






Dan,
The part is an RF shield, but I don't know whether it has been chemically
etched or not.  Ability to rework the shield is related to color.  I tried
SERA, but the system gives squirrelly results.  We are doing SEM/EDX right
now.  I think I am more inclined to believe it is due to oxide than
manufacturing residues, but we should know shortly.
Bev

-----Original Message-----
From: Dan R. Johnson [mailto:[log in to unmask]]
Sent: March 12, 2003 10:59 AM
To: TechNet E-Mail Forum.; Bev Christian
Subject: Re: [TN] German Silver


Good Morning Bev,
I think I have seen the exact condition you describe. Question; Is the
component a chemical etched Rf shield?
If so what you are seeing is probably residue from the fabrication process.
As far as I know the condition is cosmetic, i.e. doesn't affect
solderability. I consider it a process indicator and contact the vendor
when
we see it.
Good Luck,
Dan

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