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MVME55006E Single-Board Computer Installation and Use (6806800A37D)
Thermal Validation Measuring Junction Temperature
102
B.3.2 Measuring Junction Temperature
Some components have an on-chip thermal measuring device such as a thermal diode. For
instructions on measuring temperatures using the on-board device, refer to the component
manufacturer’s documentation listed in Appendix C, Related Documentation.
B.3.3 Measuring Local Air Temperature
Measure local component ambient temperature by placing the thermocouple downstream of
the component. This method is conservative since it includes heating of the air by the
component. The following figure illustrates one method of mounting the thermocouple.
B.3.4 Measuring Case Temperature
Measure the case temperature at the center of the top of the component. Make sure there is
good thermal contact between the thermocouple junction and the component. We recommend
you use a thermally conductive adhesive such as Loctite 384.
If components are covered by mechanical parts such as heatsinks, you will need to machine
these parts to route the thermocouple wire. Make sure that the thermocouple junction contacts
only the electrical component. Also make sure that heatsinks lay flat on electrical components.
The following figure shows one method of machining a heatsink base to provide a
thermocouple routing path.
Figure B-3 Thermalcouple Placement
Thermocouple
junction
PWB
Tape thermocouple wire to
top of component
Air flow