It is hard to find a reasonable way to measure CTE when the sample and the measuring device need to be at various temperatures. We can measure the sample outside here in Ottawa (it has warmed up to -20°C this morning). Dave you measure the sample outside in Cincinnati, and we compare it to Werner's measurement on a golf course in Florida. X, Y and Z axis of course. And Werner gets to write off the green fees as a business expense.
PR
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner engelmaier
Sent: Wednesday, January 21, 2009 9:13 AM
To: [log in to unmask]
Subject: Re: [TN] method of calculating CTE of a rigid flex circuit board
Hi Dave,
there may be a 'reasonable' way, but not a sufficiently accurate one. If you want to know the CTE's of a PCB, you need to measure it-in all three directions, please.
Werner
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-----Original Message-----
From: Dave Connitt <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 21 Jan 2009 6:34 am
Subject: [TN] method of calculating CTE of a rigid flex circuit board
Hello,
Does anyone know of a reasonably accurate way of calculating the overall CTE of a 4 layer rigid flex circuit board?
Thanks,
Dave Connitt CID+
Printed Circuit Designer
L3 Fuzing & Ordnance Systems
A Wholly Owned Subsidiary of:
L3 Communications
3975 McMann Road
Cincinnati, Ohio 45245
Ph. 513- 943-2010 Fax 513-943-2288
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