Thermal Metrology
R
30
Thermal/Mechanical Design Guide
3.4
Processor Case Temperature Measurement
Guidelines
The Pentium 4 processor in the 775–land LGA package is specified for proper operation when T
C
is maintained at or below the thermal profile as listed in the datasheet. The measurement location
for T
C
is the geometric center of the IHS. Figure 2 shows the location for T
C
measurement.
Special care is required when measuring T
C
to ensure an accurate temperature measurement.
Thermocouples are often used to measure T
C
. Before any temperature measurements are made,
the thermocouples must be calibrated, and the complete measurement system must be routinely
checked against known standards. When measuring the temperature of a surface that is at a
different temperature from the surrounding local ambient air, errors could be introduced in the
measurements. The measurement errors could be caused by poor thermal contact between the
thermocouple junction and the surface of the integrated heat spreader, heat loss by radiation,
convection, by conduction through thermocouple leads, and/or by contact between the
thermocouple cement and the heatsink base.
Appendix D defines a reference procedure for attaching a thermocouple to the IHS of a 775-land
LGA processor package for T
C
measurement. This procedure takes into account the specific
features of the 775-land LGA package and of the LGA775 socket for which it is intended.
§
Summary of Contents for 640 - Pentium 4 640 3.2GHz 800MHz 2MB Socket 775 CPU
Page 14: ...Introduction R 14 Thermal Mechanical Design Guide ...
Page 38: ...Thermal Management Logic and Thermal Monitor Feature R 38 Thermal Mechanical Design Guide ...
Page 52: ...Intel Thermal Mechanical Reference Design Information R 52 Thermal Mechanical Design Guide ...
Page 60: ...Acoustic Fan Speed Control R 60 Thermal Mechanical Design Guide ...
Page 72: ...Heatsink Clip Load Metrology R 72 Thermal Mechanical Design Guide ...
Page 99: ...Mechanical Drawings R Thermal Mechanical Design Guide 99 Figure 50 Reference Fastener Sheet 1 ...
Page 103: ...Mechanical Drawings R Thermal Mechanical Design Guide 103 Figure 54 Clip Heatsink Assembly ...
