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September 2023


The Impact of Thermocouple Attachment Methods... Based on the outcomes of


Continued from previous page


attachment medium. Tests 3 and 7-11 were con-


this analysis, one could conclude that a “Golden Board” should not


In addition to the thermal profiler instrument’s capability,


reading accuracy, and this study demonstrates that a limit of ten runs per sample should be con- sidered. Finally, it should be


Figure 5: peak temperature comparison by type, 5 mm pads.


ducted using the same PCB to study the repetitive use of a “Golden Sample.” The results showed that measured values decreased significantly with each cycle.


be used more than ten times, as there is a significant risk that measured values will fall out of tolerance purely from overuse (Figure 7).


Conclusion


Figure 6: quantified deviation from capability study x-bar.


the method of thermocouple attachment has a significant influence on the accuracy of tem- perature readings. This analysis


noted that each attachment method’s quality may also impact adhesion and measure- ment, so future studies should


Figure 7: repetitive testing — degradation of measured values.


suggests that high-temperature solder is the most reliable attachment medium. Likewise, overuse of a product sample, or “Golden Board”, may result in deterioration of temperature


consider multiple suppliers of each material used for thermo- couple attachment. Contact: ECD, 4287 SE


International Way, Milwaukie, OR 97222 % 503-659-6100 E-mail: neil.wolf@ecd.com


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