はじめに に 電気 ペン's 操作 および 使用
電気 テスト ペン is one of the tools よく 使用される by 電気技師 to 決定 かどうか an object is charged or not. its internal structure is a light bulb with two electrodes. the bulb is filled with neon gas, commonly known as neon bulb. One pole of it is connected to the tip of the pen, and the other pole is connected to the other end of the pen after a high resistance is connected in series. when the voltage between the two poles of the neon bulb reaches a certain value, a glow will be generated between the two poles, and the intensity of the glow is 比例 to the the 電圧 間 the two poles. when the voltage of the charged body to the ground is より大きい the the initial glow voltage of the neon bulb, and the tip of the test pen touches it, the other end is 接地 スルー the Human body, so the test pen will emit light. the function of the 抵抗 in the test 鉛筆 is to limit the current flowing through the human body to 回避 危険。
In addition to Judging かどうか the object is charged or not, the electric test pen also has the follow uses:
(1) It can be used for low電圧 phase verify to measure かどうか any wires in the line are in phase or out of phase. the specific method is: stand on an object 絶縁 from the earth, hold a test lead in each hand, and then test on the two wires to be tested. if the two test leads glow brightly, the two leads wire are different. オン 反対, it is the same phase, which is 判断 by the 原理 that the 電圧 差 間 the 2 極 of the neon bulb in the test pen is 比例 to its 光度 強度。
(2) It can be used to distinguish between alternating current and direct current. When testing with a test pen, if both poles in the neon bulb of the test pen glow, it is alternating current; if only one of the two poles glows, it is direct current.
(3) それ 缶 判断 the ポジティブ および ネガティブ 極 of 直接 current. 接続 the test pen to the DC circuit for testing, the pole that glows on the neon bulb is the negative pole, and the pole that does not shine is the positive pole.
(4) It can be used to judge かどうか the DC is 接地 or not. In the 接地絶縁 DC system, you can stand on the 地面 and touch the positive or 負 極 of the DC system with the test pen. if the neon bulb of the test pen does not light up, there is no 接地 phenomenon. if the neon bulb lights up, it means that there is a grounding phenomenon, and if it lights up like it is on the tip of the pen, it means that the positive electro is grounded. if the light is on the finger end, it is the negative ground. しかしながら, it must be pointed out that in a DC system with a ground monitoring relay, this method cannot be used to determine かどうか the DC system is 接地。
