Q&A(FAQ)
How is the temperature measured?

1. Overview

Power supply is the heat generating part, however it is installed frequently in a narrow space due to the demand of small product. In order to make sure the operating condition, temperature measurement of power supply becomes more important.
However, we have experience that the temperature measurement haven't done correctly due to incorrect measurement.
Therefore, we introduce our temperature measuring methods.

2. Temperature measuring method

Table 2.1 shows the Advantage/Disadvantage by temperature measuring method. Cosel usually use thermocouples.

Table 2.1 Advantage/Disadvantage of temperature measurement methods

Method Advantage Disadvantage
1 Thermocouples ・Wide measurement range ・Dissipated the heat by the thermocouples
・No extra space is required.
・Low price ・Due to above, it takes time to measure temperature.
・Possible to measure the inside of the object Possible to measure the air temperature. ・Necessary to connect the measurement reference point properly to the object
2 Infrared radiation thermometer ・Measure without contact ・Impossible to measure the inside of the object. Impossible to measure the air temperature.
・Measurement result changes by the emissivity of the object.
・Influenced by the environment.
3 Thermography ・Measure without contact ・Impossible to measure the inside of the object.
Impossible to measure the air temperature.
・Measurement result changes by the emissivity of the object.
・Measure whole range of the view ・Influenced by the environment.
・Expensive

3. How to choose the type of thermocouples?

There are many types of thermocouples by material or thickness. It is necessary to choose thin size one to avoid the heat dissipation from the target devices. We uses following thermocouples which the thermal conductivity is relatively small and the wire is thin.
1) Type：Type K (Base metal +:Ni/Cr, -:Ni alloy)
2) Thickness：Φ0.1

4. How to hold the edge of thermocouples?

The reference contact point must be fixed to the target device to get proper measurement result.
The fixing methods would be adhesive, resin tape or metal tape etc. We recommend to use adhesive in the point of view of adhesion at high temperature condition.

Technical Product-related Inquires

e-mail:support@cosel.co.jp