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大家知道,接地试灯1DD、2DD插头接地后,可以显示控制回路或照明回路的正极或负极接地(也可以显示蓄电池漏电)。如果是负极接地,我们还可以用按下某电器电路上的按钮开关及有关的电器联锁,使该电器得电。此时负极接地就可变化为正极接地,而1DD亮变化为2DD亮。这样可以把接地处所缩小在某一个小范围里,迅速排除。例1,将照明电路里的热风机开并11K闭合后,若试灯由1DD亮变化为2DD亮,这就
As we all know, the grounding test lamp 1DD, 2DD plug grounding, you can display the control circuit or lighting circuit of the positive or negative ground (also can display battery leakage). If it is negative grounding, we can also press the button on an electrical circuit switches and related electrical interlock, so that the electrical appliances. At this point the negative ground can be changed to positive ground, and 1DD bright change to 2DD light. This can narrow the ground in a small area, quickly ruled out. Example 1, the lighting circuit to open the hot air blower and 11K closed, if the test light from 1DD bright light changes to 2DD, which