Low-voltage pen is generally suitable for AC voltage below 500V, and can test DC voltage of1.0 V-400 V. Low-voltage pen is an electrical tool to test whether there is electricity in the wire. There is a neon bulb in the pen. If the neon lamp glows during the test, it means that the wire has electricity or is the live wire of the channel. The tip and tail of the electric pen are made of metal materials, and the pen holder is made of insulating materials.
Contact electric probe is a detection tool to obtain electrical signals by contacting charged objects. Usually the shape is a screwdriver, which is used for both electric pens and screwdriver. Pen type, display measurement data directly in LCD window. Inductive probe adopts inductive test, which can check the voltage on the control line, conductor and socket without physical contact or check the open circuit position along the conductor, greatly ensuring the personal safety of testers.
Use of test pen
It can be used for low-voltage nuclear phase detection and measuring whether any wires in the line are in-phase or out-of-phase. The specific method is to stand on an object insulated from the earth, hold a stylus in each hand, and then test it on two wires to be tested. If two contact pins emit bright light, the two wires are out of phase. On the other hand, it is in phase, which is judged by the principle that the voltage difference between the two poles of neon lamp bulb in the test pen is proportional to its luminous intensity.
It can be used to distinguish alternating current from direct current. When testing with a pencil, if both poles in the neon lamp of the pencil shine, it is alternating current. If only one of the two poles emits light, it is direct current. You can also judge the positive and negative poles of DC, and connect the test pen in the DC circuit for testing. The bright pole of neon light bulb is the positive pole, and the unlit pole is the negative pole.