HI RON
FROM MY DAYS OF WORK AT KISTLER-MORSE DESIGNING LOAD CELLS
I THINK YOU WOULD BE WISE TO INVESTIGATE THE USE OF A CERAMIC
SUBSTRATE. FR-5 OR ANY OTHER TYPE OF COMPRESSIBLE MATERIAL WILL
OVER TIME DRIFT DO TO NON ELASTIC PROPERTIES.

JOHN COY
PCB DESIGNER


-----Original Message-----
From: King, Ron [mailto:[log in to unmask]]
Sent: Wednesday, April 04, 2001 9:48 AM
To: [log in to unmask]
Subject: [DC] Substrates


I have a design engineer who wants to redesign a piezo wafer and PCB
sandwich that will be compressed in order to get a force reading.  We are
currently using FR-5 and the substrate appears to be holding up however, we
have not done a micro section.  My question is:  What substrate would offer
the most resistance to compression in the Z axis without being too brittle?

Thanks,

-Ron King
PCB Designer

Hunter Engineering
11250 Hunter Drive
Bridgeton, MO 63044
314-731-0000 x541

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