How to use the test pen? The correct way to hold and use the test pen
The electric test pen is an electrical tool used to test whether there is electricity in the wire, referred to as "electric pen". So, do you know how to use the electric test pen and what is the correct way to hold the electric test pen? The following is the correct way to hold and use the electric test pen.
1. The correct way to hold the low-voltage test pen
Commonly used low-voltage test pens, master the two-grip method of testing. A pen-style tester, the metal clip is pressed against the palm of the hand. Thumb index finger and middle finger, pinch the middle of the electric pen barrel.
Rotary chisel-type electric measuring pen, the index finger presses the tail metal cap. With the thumb, middle finger and ring finger, pinch the middle of the plastic rod. The small window of the neon tube is backlit, and you can observe it by facing yourself.
2. Things to know when using a low-voltage test pen
When using a low-voltage tester, you should know that there should be eight items. With a ballpoint pen test pencil, pinch the rod with a metal hoop. Carefully inspect the assembly inside the electric pen, the resistor must be behind the neon tube.
Regularly test the resistance value, it must be greater than one megohm. Rotary chisel type measuring pencil, the chisel rod is covered with an insulating tube. Before use, there is a forecast at the power station to check whether the performance is good.
The test operation must be accurate, and be careful not to touch the double line with the tip of the pen. For electrical testing on an insulating pad, the human body must be grounded. Tested under bright light, the glow of the neon tube is not clear.
3. The test pen distinguishes AC and DC
The electric pen measures AC and DC, AC is bright and DC is dark. The whole body of the AC neon tube is bright, and the side of the DC neon tube is bright.
4. The electric measuring pen distinguishes the positive pole and the negative pole of the direct current
To judge the positive and negative poles of DC, look carefully at the neon tube of the electric pen. The bright front end is the negative pole, and the bright rear end is the positive pole.
5. Test and judge the positive and negative grounding of the DC system with the electric test pen
In the DC system of the substation, the electric pen does not light up when touched. If the light is near the tip of the pen, there is a ground fault on the positive terminal. If the light is close to the handle, the ground fault is at the negative pole.
6. Use the test pen to judge whether any two wires in the AC circuit are in phase or out of phase
To judge whether the two wires are the same or different, hold an electric pen in each hand, insulate the two feet from the ground, touch a wire with each pen, and look at a pen with two eyes.
