要了解指针式温度计，首先要先了解“双金属片”，双金属片就是由两层材料复合而成的一种特殊金属片，金属片由基层和可变层组成，基层是一种铁基材料，基层的长度是不随环境温度变化而变化的；可变层是由多种金属元素构成的合金材料，可变层的长度是随着环境的温度变化而变化，环境温度升高可变层变长，环境温度降低可变层变短，也就是我们常说的热胀冷缩现象。 指针式温度计，一般是指双金属温度计，其原理就是，将双金属片绕制
2020/12/16 hongling
Advantages of AOI testing As some electronic devices are getting smaller and smaller, PCB boards are becoming more and more sophisticated. The difficulty of manually detecting PCB boards is increasing
2019/09/02
Principle of AOI detection Principle: The optical camera is used to scan the PCB on the device, collect images, and compare the collected solder joint data with the qualified data of the machine datab
2019/09/02
Ten principles of chip inductors used in Smt chip processing 1. The spacing of the chip inductors is smaller than the inductor pitch to avoid excessive soldering stress causing excessive tensile stres
2019/09/02
Since its founding in 1985, the Macworld Expo has become the most influential Apple ecosphere in the world. The exposition, with the theme of "defining the future with innovation", will be o
2018/01/12
