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May 1997

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>From bergdi Wed May 28 20:
36:40 1997
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Subject:
Plating Thickness inside hole walls ; reliability of measurement
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Anil K Singh <[log in to unmask]>
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Linaks Microelectronics Ltd
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From [log in to unmask] Thu May 29 09:
57:07 1997
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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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