1. Correct grip when using a low-voltage test pen
Commonly used low-voltage test pen, master the two-grip test method. Pen-type test pen, the palm touches the metal clip. Thumb index finger and middle finger, pinch the middle of the pencil holder.
Rotary chisel-type test pen, the index finger presses the metal cap on the tail. Thumb, middle finger, ring finger, pinch the middle of the plastic rod. The neon tube small window is backlit, and you can observe it towards yourself.
2. Things you should know when using a low-voltage test pen
When using a low-voltage test pen, you should know that there should be eight items. Take a ballpoint pen to test the electric pen, and pinch the handle with a metal hoop. Assembled in a fine test pen, the resistor must be behind the neon tube.
Periodically check the resistance value, which must be greater than one megohm. (Copyright) Rotary chisel type electric test pen, the chisel rod is covered with an insulating tube. There is electricity forecast before use to check whether the performance is good.
The test operation should be accurate, and be careful not to touch the double line with the pen tip. The electrical inspection is performed on the insulating mat, and the human body must be grounded. Tested under bright light, the neon tube glow is not clear.
3. The electric test pen distinguishes between alternating current and direct current
The electric pen measures AC and DC, and the AC is bright and DC is dark. The AC neon tube is bright throughout, and the DC neon tube is bright on one side.
4. The test pen distinguishes between the positive and negative electrodes of direct current
Measure the positive and negative poles of the DC, and look carefully at the neon tube of the electric pen. The front bright is negative, the rear bright is positive.
5. Test and judge the positive and negative poles of the DC system to be grounded
In the DC system of the substation, the electric pen does not light up. If the light is close to the tip of the pen, the positive pole has a ground fault. If the light is close to the hand-held end, the ground fault is at the negative pole.
6. The test pen can determine whether any two wires in the AC circuit are in phase or out of phase
To measure the difference between the two lines, hold an electric pen in each hand, the feet are insulated from the ground, touch a line with each of the two pens, and watch a pen with both eyes.
