Intel E6700 Mechanical Design Guidelines - Page 43
Environmental Reliability Testing
UPC - 735858184618
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Balanced Technology Extended (BTX) Thermal/Mechanical Design Information 5.1.5 5.1.6 Altitude The reference TMA will be evaluated at sea level. However, many companies design products that must function reliably at high altitude, typically 1,500 m [5,000 ft] or more. Air-cooled temperature calculations and measurements at sea level must be adjusted to take into account altitude effects like variation in air density and overall heat capacity. This often leads to some degradation in thermal solution performance compared to what is obtained at sea level, with lower fan performance and higher surface temperatures. The system designer needs to account for altitude effects in the overall system thermal design to make sure that the T requirement for the processor C is met at the targeted altitude. Reference Heatsink Thermal Validation The Intel reference heatsink will be validated within the specific boundary conditions based on the methodology described Section 5.2 , and using a thermal test vehicle. Testing is done in a BTX chassis at ambient lab temperature. The test results, for a number of samples, will be reported in terms of a worst-case mean + 3σ value for thermal characterization parameter using real processors (based on the thermal test vehicle correction factors). 5.2 Environmental Reliability Testing 5.2.1 5.2.1.1 Structural Reliability Testing Structural reliability tests consist of unpackaged, system -level vibration and shock tests of a given thermal solution in the assembled state. The thermal solution should meet the specified thermal performance targets after these tests are conducted; however, the test conditions outlined here may differ from your own system requirements. Random Vibration Test Procedure Recommended performance requirement for a system: • Duration: 10 min/axis, 3 axes • Frequency Range: 5 Hz to 500 Hz 5 Hz @ .001 g2/Hz to 20 Hz @ 0.01 g2/Hz (slope up) 20 Hz to 500 Hz @ 0.01 g2/Hz (flat) • Power Spectral Density (PSD) Profile: 2.2 G RMS Thermal and Mechanical Design Guidelines 43