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May 1998

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Subject:
Re: FAB: CMI hand held copper thickness checker
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Date:
Wed, 13 May 1998 11:21:00 +0200
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Ed Cosper wrote:
>
> Hi all,
>
> Just a question. I have been having problems getting my CMI unit to read copper thickness consistently. It has typically been reading low. For instance, the meter will show .0005 to .0006 of copper on a standard .042 thru hole but a section of the same hole shows .0012.  The meter reads fine to the provided standard.  Has anyone else experienced this problem. I should note that the meter was just calibrated a few weeks ago so calibration should not be an issue.
>
> Ed Cosper
>
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Hi
The resistance is different between different kinds of copper deposit.
I have a UPA hand held instrument. I plate a board and punch out two
holes next to each other.One gets cross sectioned and measured. The
other one is used as a standard. I feed the UPA with the measured values
and calibrate.It gives me very accurate results.
Regards
Peter

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