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Thermal Metrology
20 Intel® 631xESB/632xESB I/O Controller Hub Thermal Mechanical Design Guide
5.1.5 Thermocouple Attachment to the IHS
Caution: To avoid the impact on the thermocouple during the SMT process, reflow must be
performed before attaching the thermocouple to the grooved MCH IHS.
1. Clean the thermocouple wire groove with isopropyl alcohol (IPA) and a lint free
cloth removing all residues prior to thermocouple attachment.
2. Place the thermocouple wire inside the groove letting the exposed wire and bead
extend about 3.2 mm (0.125 inch) past the end of groove. Secure it with Kapton
tape (Figure 5-4).
3. Lift the wire at the middle of groove with tweezers and bend the front of wire to
place the thermocouple in the channel ensuring the tip is in contact with the end of
the channel grooved in the IHS (Figure 5-5 A and B).
4. Place the MCH under the microscope unit (similar to the one used in Figure 5-8) to
continue with process. It is also recommended to use a fixture to help holding the
unit in place for the rest of the attach process.
5. Press the wire down about 6 mm (0.125 in.) from the thermocouple bead using the
tweezers. Look in the microscope to perform this task. Place a piece of Kapton tape
to hold the wire inside the groove (Figure 5-7). Refer to Figure 5-6 for detailed
bead placement.
6. Using the micromanipulator, place the needle near to the end of groove on top of
thermocouple. Using the X, Y, and Z axes on the arm, places the tip of needle on
top of the thermocouple bead. Press down until the bead is seated at the end of
groove on top of the step (see Figure 5-6 and Figure 5-7).
7. Measure resistance from thermocouple end wires (hold both wires to a DMM probe)
to the IHS surface. This should be the same value as measured during the
thermocouple conditioning see “Thermocouple Conditioning and Preparation” on
page 19, step 2 and Figure 5-8.
8. Place a small amount of Loctite 498* adhesive in the groove where the bead is
installed. Using a fine point device, spread the adhesive in the groove around the
needle, the thermocouple bead and the thermocouple wires already installed in the
groove during step 5. Be careful not to move the thermocouple bead during this
step (Figure 5-9).
Figure 5-3. Bending the Tip of the Thermocouple