temperature measuring techniques.

Posted by: phd.nash on 02/19/2009

to measure the temperature of switching devices we use a thermal camera. sometimes there are some differences between your(Power integrations) and our temperature measurement results. we are sure about the accuracy of our thermal cam. Which tech. do you use to measure temperature? What is the best technique to measure case temperature?

Comments

Hello phd.nash,

We do have three main measurement techniques for thermal evaluations. Function of size, power levels, and switching noise we use thermocouples, SMD thermistors, or thermal imaging. As soon as the power level, PCB copper areas, efficiency, air speed, etc. changes, the final result will be different. Even with two identical units it is possible to read different values. If that difference is 1%, 5% or more is a matter of instrument precision and ambient stability.

Cheers,
PI_Crusher

When using thermal camera we assume plastic devices have emissivity factor of 0.93. For shiny surfaces like heatsinks we place electrical tape (transformer tape) which has a factor of .92. WE have correalted reading with thermocouple and they match quite well.

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