Introduction to temperature rise of FPC board

Introduction to temperature rise of FPC board

The purpose of temperature rise is to verify the life and stability of electronic products. Usually, the temperature rise of important components (IC chips, etc.) is tested, and the device under test is placed above its rated operating temperature (T=25). °C) Run at a specific temperature (such as a constant temperature of 40 ° C), and then record the temperature rise of its components above ambient temperature after stability to evaluate whether the design of this product is reasonable.

Temperature rise test method of FPC board: At present, the temperature rise test instruments are mainly divided into two types, non-contact type (infrared thermal imager) and contact type (thermocouple), and most of them are currently used.

Non-contact (infrared cameras) can also be divided into two types, point thermometers (single-point) and thermal imagers, which work in the same way: by detecting infrared radiation and then converting it into temperature readings. The spot thermometer is an infrared camera with only one pixel. It can only test the temperature of a single point. The tester will miss a lot of key information and has limited limitations. The thermal imager not only can test the temperature of thousands of points, but also can convert the temperature reading into a thermal image. The generated thermal image can fully reflect the overall condition of the device to be inspected, and the tester can find hot spots that are not easy to find.

Contact (thermocouple, thermal resistance) testers are widely used in the whole machine industry.

Thermocouples are used as sensors for measuring temperature of FPC board. They are usually used with display instruments, recording instruments and electronic regulators. They can directly measure the temperature of liquid, vapor and gas media and solid surfaces in the range of 0~1800 °C in various production processes. The temperature measurement principle of the thermal resistance is based on the characteristic that the resistance value of the conductor or the semiconductor changes with the temperature, and the advantages thereof are also many, and the electric signal can be transmitted far, the sensitivity is high, the stability is strong, the interchangeability and the accuracy are both Better, but requires power excitation, not instantaneous measurement of temperature changes.