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1995

DesignerCouncil@IPC.ORG

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Date:
Thu, 22 Jun 1995 16:48:33 -0400
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Ed,

As with any college accredited course of study, proper terminology is
essential. The U.S. military, IPC standards and international IEC standards
all use IPC-T-50 as thier terms and definition standard. To this end, all
course materials, including the multi-media CD-ROM disk contain all
definitions as reference (or required) in each objective.

What is important, is that an understanding of the concepts of design are
emphasized. For example, let's take the determination of the minimum size
land, for a given hole. We normally take twice the minimum annular ring
requirement, add the maximum finished hole size, and a standard fabrication
allowance to derive the minimum land required. The IPC-D-275 contains a table
listing the minimum anular ring requirements for rigid boards. However, we
all may disagree with those numbers. The exam would test for an understanding
of what items must be considered in the calculation. The final number (land
size) is really secondary. So don't expect a question that askes what is the
minimum annular ring requirement. A 
proper question would ask for you to calculate a minimum land size given a
specific hole size and minimum annular ring requirement.

This philosophy of principles, rather than specific numbers in IPC tables,
prevails throughout the examination process. However, some questions will
require one to look up a number in a table and then apply it to a specific
problem. 

I trust this clarifies some of your concerns.

Regrds,

Gary Ferrari



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