Intel 82599 10 GbE Controller Datasheet ®

Intel

®

82599 10 GbE Controller—Measurements for Thermal Specifications

Care must be taken to avoid introducing errors into the measurements when measuring a surface temperature that is a different temperature from the surrounding local ambient air. Measurement errors may be due to a poor thermal contact between the thermocouple junction and the surface of the package, heat loss by radiation, convection, conduction through thermocouple leads, and/or contact between the thermocouple cement and the heat-sink base (if used).

13.13.2 Attaching the Thermocouple (No

Heatsink)

The following approach is recommended to minimize measurement errors for attaching the thermocouple with no heatsink:

• Use 36-gauge or smaller-diameter K-type thermocouples.

• Ensure that the thermocouple has been properly calibrated.

• Attach the thermocouple bead or junction to the top surface of the package (case) in the center of the heat spreader using high thermal conductivity cements.

Note:

It is critical that the entire thermocouple lead be butted tightly to the heat spreader.

Attach the thermocouple at a 0° angle if there is no interference with the thermocouple attach location or leads (see

Figure 13-7

). This is the preferred method and is recommended for use with packages not having a heat sink.

Figure 13-7 Technique for Measuring Tcase with 0° Angle Attachment, No Heatsinks

13.13.3 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.

Note:

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 ( Figure 13-8

). This is the preferred method and is recommended for use with packages with heatsinks.

1000 331520-004