Dr. Zapfardt? Glad it's Friday. :)

Jason Gregory
Manufacturing Engineer
x5593


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask]
Sent: Friday, October 22, 2004 10:20 AM
To: [log in to unmask]
Subject: Re: [TN] A poll of sorts...concerning thermocouple attachment


My first choice would be to attach TCs using either high-temp solder or
conductive epoxy (after first removing the existing alloy at the
connection).  If
you can commit a PCBA to profiling, this is the long-term  way to go.
Of course there are times when you cannot sacrifice a PCBA to the Profile
Gods.  Temprobes are good (we tested them a number of years ago) as long as
the
point of contact is on the flat of the joint being probed.  If you hit  it
at
an angle, you can be off by as much as 10 deg C.
Like Karen, I have had pretty good success with aluminum tape.  Quick,
cheap
and easy and with very little addition of tolerance.  The article on  KICs
website explains it pretty well.
According to Dr. Zapfardt in the October issue of Circuits Assembly ("On
The
Forefront")attaching the TC with Kapton tape is for bozos who really are not
interested in actually getting accurate profiles, but are just killing
time.
 I couldn't have said it better myself.

Phil Zarrow
ITM Consulting
Durham, NH  USA
www.ITMconsulting.org

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