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低压测电笔具有体积小、造价低、电工每人都有、便于携带等特点,如能正确运用,不但具有一般用途,还具有以下各种性能:鉴别交流直流电,识别直流电的极性,测量晶体二极管的好坏及极性的识别,还有线路的通断的测量,找故障等。测电笔具有较高的内阻,管内氖泡随外加电压的降低而内阻增大,500伏时内阻为1.5兆欧,此时流过电笔的电流只有333微安,这样小的电
Low voltage test pencil with small size, low cost, electrician each have, easy to carry and so on, if correctly used, not only for general use, but also has the following properties: Identification of AC and DC, DC polarity recognition, measurement of crystal Diode of good and bad and polarity identification, as well as the line off measurement, find fault and so on. Measuring the pen has a high resistance, the neon bulb with the internal voltage decreases and the internal resistance increases, 500 volts when the internal resistance of 1.5 megohm, then the electric current flowing through the pen is only 333 micro-amps, such a small electricity