三端稳压器可以采取用万用表测量引脚间的电阻值和测量稳压值来判断其好坏。
①测量引脚间的电阻值
把指针式万用表放至“R×1k”档,将黑表笔接到稳压器的地端,红表笔依次接触另外两个引脚,测量引脚间的正向电阻,然后将红表笔接地端,黑表笔依次接触另外两个引脚,测量引脚间的反向电阻。
如果测出引脚间的正向电阻值为一固定值,而反向电阻值为无穷大,则三端稳压器正常。如果测得某两脚之间的正、反向电阻值均很小或接近0,则可判断该三端稳压器内部已损坏;如果测得某两脚之间的正、反向电阻值均为无穷大,则说明该集成稳压器已开路损坏;如果测得的电阻值不稳定,随温度的变化而改变,则说明该集成稳压器的热稳定性能不好。
②测量输出端的稳压值
根据三端稳压器输出电压的大小,把万用表放至直流电压合适的挡位,如“10V”或“50V”挡。然后在被测稳压器的输入端1与接地端2之间加上一个直流电压,然后测量该稳压器的3端的输出电压值。根据输出的电压值就可判断该稳压器是否正常。此法对于在线测量也是适用的,而且更容易观察稳压效果。测试时加至输入端的电压应比标称输出电压高3V,但不能超过其规定的最大输入电压。
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