How to test the positive and negative poles of the digital electric pen
1. The household digital test pen is very simple to use. Insert the metal part of the test pen into or touch the test voltage, press and hold the direct detection button, press it with any finger, and a string of numbers will be displayed on the display, the largest number It is to test the voltage of the electric body. Remember that no part of the body can touch the metal part of the test pencil.
2. According to what you said, there should be two wires. If you want to know the voltage between the two wires, it is easy to handle. You use two wires to connect directly to the two ends of the test pen, which is to press it by hand. Place and the tip of the test pen, look at the brightness of the test pen, and compare it with the brightness of a single wire measured by the test pen. If the brightness is the same, it proves this.
3. As long as there is current passing through such a circuit, even if it is less than 1mA, the neon bulb of the electroscope pen will light up and we can use the electroscope pen because it is safe and harmless. When the charged body we are testing forms a loop, the current When passing through the electroscope pen, if the neon bulb of the electroscope pen does not emit light, it means that there is no total electricity in the circuit.
4. Explain that the front end of the neon tube refers to the tip of the electroscope pen, and the back end of the neon tube refers to the end of the hand. Touch any pole of the power supply, hold the test pencil with the other hand, and the metal head of the pencil touches the other pole of the power supply under test, the neon tube.
How to use the induction test pen
The induction test pen can measure both AC and DC. When measuring a DC battery, you need to touch the other pole of the battery with the other hand. The range shows 12v, 24v, 36√, 110v, 220v. When measuring the presence or absence of electricity, it can directly display the voltage. It can be used in the same way as the old-fashioned neon bulb electric pen. When measuring the breakpoint of the cable, connect the suspected line to the live wire, and stick the contact of the electric pen on the cable to move. The pen will display 12v, and when the breakpoint is reached, the display will disappear, move back and forth, determine the position, and find the breakpoint. This is the biggest advantage of the induction pen over the old-fashioned neon bulb test pen, but remember to connect other wires to the neutral line , otherwise, due to induction, there will be electricity everywhere, and the breakpoint cannot be found, and it may not be detected for new cables with good quality.
It can measure alternating current and direct current. When measuring a direct current battery, you need to touch the other pole of the battery with the other hand. The range shows 12v, 24v, 36√, 110v, 220v. When measuring the presence or absence of electricity, it can directly display the voltage. It can be used in the same way as the old-fashioned neon bulb electric pen. When measuring the breakpoint of the cable, connect the suspected line to the live wire, and stick the contact of the electric pen on the cable to move. The pen will display 12v, and when the breakpoint is reached, the display will disappear, move back and forth, determine the position, and find the breakpoint. This is the biggest advantage of the induction pen over the old-fashioned neon bulb test pen, but remember to connect other wires to the neutral line , otherwise, due to induction, there will be electricity everywhere, and the breakpoint cannot be found, and it may not be detected for new cables with good quality.
