Operation method of digital display measuring pen
1, immediate measurement method
The immediate measurement method refers to the measurement method that the camera of the measuring pen directly touches the measured object to distinguish whether it is charged or not.
When applying the immediate measurement method, touch the metal camera of the measuring pen to the measured object, and press the DIRECT function key with your hand.
If the tested object is charged, the display light on the test pen will be lit, and the display will display information to determine the standard value of the voltage.
General test pens can display information of 12v, 36v, 55v, 110v and 220v. In general, the final display information mark value of the display is the measured voltage value.
Immediate measurement method (220v voltage)
2, magnetic induction measurement method
Magnetic induction measurement refers to the measurement method that the camera of the stylus is close to but does not touch the measured object, and the voltage magnetic induction is used to distinguish whether the measured object is charged or not.
If the transmission line is charged, the display of the measuring pen displays the marking mark of the information voltage;
If the disconnection indicator light in the middle of the transmission line goes out, the voltage marking mark fades, indicating that there is disconnection in the position.
The magnetic induction measurement method can find the broken part of the insulated wire, and can also distinguish the live wire from the zero wire.
Electricity has brought convenience to our daily life, but it is also risky. Therefore, the difficult proposal about electricity should be handed over to the technical professional staff to solve, so don't be brave.
Principle of detecting luminescence by electric pen
The principle of detecting luminescence by electric pen is that there is a certain potential difference between the charged body and the earth. When the potential difference exceeds a certain value, the neon bulb will emit light, and below a certain value, it will not emit light. The voltage measurement range of ordinary low-voltage test pens is generally 60-500 V, and neon bulbs below 60v may not emit light. When it is higher than 500V, it can't be tested with a low-voltage test pen, otherwise insulation breakdown will occur, causing the danger of electric shock to human body.
When the hand-held electric pen stands on a stool or other insulators to test the fire line, the large current will turn into a weak small current through the large resistance step-down resistor rod inside the electric pen, and then discharge to the surrounding environment through the neon bubble and the human body. At this time, the neon bubble will emit light. However, there is no danger of electric shock at this time.
