In a message dated 2/7/01 10:53:43 AM US Eastern Standard Time,

[log in to unmask] writes:



> 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.



Howard-

In regard to the "jagged " lines, I experienced in a past life that the use

of "temporary" probes exhibit this phenomenon if they are not attached to the

PCB in such a way that the movement of the conveyor isn't reflected in the

readout - indicating the temp probe is not maintaining constant contact with

the PCB surface.



my two cents worth



Pat Kane

CSL





>  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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