we use the Temprobes all the time. A couple of tricks are, the probes have
some spring to them, so make sure they held down firmly in place near where
you want it, then tighten the clamp (make sure the probe is mounted on the
clamp so that the tightening motion is towards the probe tip to apply some
spring tension (otherwise the tip could tend to lift during tightening).
When placing the tip I like to start beside the pad so as not to disturb the
part when tightening the clamp. The tip can then be moved over to the pad.
With a little spring pressure applied like this you will not get any false
readings and not have to worry about taping down any wires accross the rest
of the board.

> ----------
> From:         Howard Watson[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         2001,February 07 9:47 AM
> To:   [log in to unmask]
> Subject:      [TN] "Temprobe" thermocouples for profiling
>
>
> Technetters,
>
> Does anyone have experience using the Temprobe thermocouples for profiling
> in a reflow oven?  We have recently purchased 4 of these and after initial
> profiles were run, the profile plot showed very jagged lines compared to
> previous profiles run using "soldered-in" thermocouples.  In addition,
> when using the same recipe and test points on the PCBA, the max rising
> slope and total time above had risen well above our standards.  The lines
> on the graph for the four test points are relatively far apart.
>
> We are using a Vitronics XPM 820 ten zone oven in air, and the SlimKIC
> Transmitter/Data Logger.  The thermocouple tips are carefully placed on
> the desired soldered leads of a soldered (previously) board.  Did the
> solder with the soldered-in thermocouples inhibit the rate and amount of
> thermal energy transfer that much?  Any suggestions or knowledge regarding
> the Temprobes will be greatly appreciated.
>
> Howard Watson
> AMETEK/Dixson
>

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