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February 2001

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Subject:
From:
"Samuel.Ares" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 8 Feb 2001 11:31:36 -0500
Content-Type:
text/plain
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text/plain (81 lines)
Phil,

Does the Aluminum tape have to have certain characteristics or be from a
certain manufacturer? We are presently using aluminum tape simply bought at
a hardware store, should we be using more specific tape whose adhesive if
more resistant to temperature? Does such a product exist?
Samuel Ares
Process Engineering
Leitch Technology Int.
[log in to unmask] <mailto:[log in to unmask]>
(416) 445-9640  x. 3395

        -----Original Message-----
        From:   Phil Zarrow [SMTP:[log in to unmask]]
        Sent:   Wednesday, February 07, 2001 7:57 PM
        To:     [log in to unmask]
        Subject:        Re: [TN] "Temprobe" thermocouples for profiling

        Howard and all -
        I benchmark tested the Temprobes a few years ago.  I found the trick
to
        getting a reltatively accurate reading was to make sure that the
probe tip is
        in firm and tangent contact with the solder joint.  If it is not
making good
        contact, as in only a portion of the tip on the joint due the angle
of the
        joint, you will get the noise you noticed (and a very inaccurate
reading)l.
        Very similar to attaching a TC with kapton tape (another no--no) =
you're
        reading air temp, IR, and not just the interconnection.  Some users
have
        actually put thermal "grease" on top of the Temprobe/Joint
interconnection
        (yuk).
        I've been very dubious of temporary probe attachment but, having
worked in
        contract assembly, know the reality of some situations.  The
Temprobe can
        work but with the caveats.  Greg Jones of KIC and others have
experimented
        with aluminum tape with very good, reliable results.  I have yet to
test this
        method thoroughly but Greg is very credible.
        Happy profiling!
        Phil Zarrow
        ITM Consulting
        Durham, Great White North of NH     USA
        www.ITM-SMT.com


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