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May 1997

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Subject:
Plating Thickness inside hole walls ; reliability of measurement
From:
Anil K Singh <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Thu, 29 May 1997 07:23:29 +0530
Content-Type:
text/plain
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text/plain (26 lines) 
Dear Technetters,

1. What is the reliability of hole wall plating thickness meauring
instruments like CAVIDERM ( based on barrel resistance )? How does one
counter the inherent uncertainties of this measuring technique?

2. X-bar R method for plating thickness process control is more of a
corrective measure than a preventive one. What on line SPC/SQC controls
should be adopted?

M. Kumar
Senior Engineer Quality
Linaks Microelectronics Limited
e-mail: [log in to unmask]

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