82598EB Datasheet, PDF (591/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Measurements for Thermal Specifications
Figure 8-14. Technique for Measuring Tcase with 0° Angle Attachment, No Heatsink
8.16.6.3 Attaching the Thermocouple (Heatsink)
The following approach is recommended to minimize measurement errors for attaching the thermocouple with
heatsink:
• Use 36-gauge or smaller diameter K-type thermocouples.
• Ensure that the thermocouple is properly calibrated.
• Attach the thermocouple bead or junction to the case’s top surface in the geometric center using
a high thermal conductivity cement. It is critical that the entire thermocouple lead be butted
tightly against the case.
• Attach the thermocouple at a 90° angle if there is no interference with the thermocouple attach
location or leads. This is the preferred method and is recommended for use with packages with
heatsinks.
• For testing purposes, a hole (no larger than 0.150” in diameter) must be drilled vertically through
the center of the heatsink to route the thermocouple wires out.
• Ensure there is no contact between the thermocouple cement and heatsink base. Any contact
affects the thermocouple reading.
Figure 8-15. Technique for Measuring Tcase with 90° Angle Attachment
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