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有资料介绍,检查晶振或陶瓷滤波器时,用万用表欧姆档测量,如果测量结果为无穷大,则说明晶振或陶瓷滤波器是好的。笔者认为这种测量结果还不能说明晶振或陶瓷滤器是好是坏,因为即使晶振或陶瓷滤波器坏了,如果引脚在内部断了,测量结果也是无穷大。 晶振和陶瓷滤波器都是在压电材料两面涂上银层,再在银层上焊上电极引线作引脚,再经封装而制成的。这两种元件就像是一个小电容器,用测量小电容器的方法来判断晶振和陶瓷滤波器的好坏就比较可靠。具体的测量方法是:把万用表拨到10k挡,用两只NPN型三极管(如3DG6、
Data are introduced, check the crystal or ceramic filter, the multimeter ohm measurement, if the measurement is infinite, then the crystal or ceramic filter is good. I think this measurement results can not explain the crystal or ceramic filter is good or bad, because even if the crystal or ceramic filter is broken, if the pin is broken inside, the measurement results are infinite. Crystal and ceramic filters are coated with silver on both sides of the piezoelectric material, and then welded on the silver electrode leads for pins, and then made by the package. These two components are like a small capacitor, with a small capacitor measurement method to determine the quality of the crystal and ceramic filter is more reliable. The specific measurement method is: dial the multimeter to 10k block, with two NPN type transistor (such as 3DG6,