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March 2000

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Subject:
From:
Alain Savard <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 24 Mar 2000 07:19:56 -0500
Content-Type:
text/plain
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Oops hit the reply button too fast.

Pulse plating may greatly help to reduce plated copper difference in
thickness for different hole sizes. But you have to get use to that
technology.

Have a great day,

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]


-----Original Message-----
From: Alain Savard
Sent: March 24, 2000 7:17 AM
To: 'TechNet E-Mail Forum.'
Subject: RE: [TN] Measuring plated thru hole copper


Don't know how to tell you this Franklin, put copper plating in small
diameter holes (below 0.014") is not the same as in larger holes. In small
holes, you may get much thicker plating at the surface and near the knee of
the hole then what you get near the centre of the hole. Back when we had our
in-house plating shop, way back in '97, I had looked into getting such a
device and found it unreliable at best. It gives a good approximation, but
it measures an overall average, not the thinnest points. But technologies
may have changed since I looked into this.

My 2 cents worth,

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]

-----Original Message-----
From: Franklin Asbell
Subject: Re: [TN] Measuring plated thru hole copper

Are you looking for a device to measure thickness on individual holes? O
overall through hole plating. The CMI device is very accurate at measuring
hole wall copper thickness.

Yes, it has hole size limitaitons but it's not the actual hole you are
measuring, right? You might consider adding a few probe holes around the
panel, the CMI unit works great in that way.

Franklin

----- Original Message -----
From: May William D (Dean) CNIN
Subject: [TN] Measuring plated thru hole copper

> We are looking to buy a hand held unit to measure plated thru hole copper
> thickness.  I know CMI makes one but it can only measure a minimum hole
size
> of 35 mils.  Are there any other vendors out there that make hand held
> units.
>
> Would appreciate any information.
>
> Thanks!
>
> Wm. Dean May
> NSWC Crane
> Bldg. 38, Code 8086
> 300 Highway 361
> Crane, IN 47522
> 812-854-3073

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