How to use the digital screen to display a lot of electric test pencils
usage method
The index and middle fingers grip the electric pen completely, while the thumb presses down on the metal at the back of the pen to make an electric shock, and lightly touches the charged body with the tip of the pen.
working principle
Using the human body as a circuit, it lights up when the voltage reaches the working voltage of neon bubbles.
matters needing attention
Before conducting an electrical test, confirm the quality of the electric pen on the charged body to ensure no misjudgment.
During electrical testing, do not touch the metal part at the front end of the electric pen to avoid electric shock.
3. Before use, carefully read the instruction manual and pay attention to the range. Some range from 50v to 500v, while others range from 110v to 500v.
4. Pay attention to distinguishing between AC and DC.
When uncertain, use a multimeter and do not take chances.
6. The body is insulated from the earth.
Digital display pen.
A digital pen is a device that displays voltage on the screen during measurement. Typically, the maximum number displayed on the pen screen is the measured voltage. But I always feel a bit unreliable.
usage method.
There are two test buttons on the electric pen, direct test and induction breakpoint test. We only need to select and touch these two buttons according to the purpose of our own testing when using them.
Measure on/off.
This feature has the advantage of being superior to neon bubble pens in terms of displaying numbers. When measuring, it is necessary to disconnect the power supply. Hold one end of the wire with one hand, touch the sensing button with the thumb with the other hand, and touch the other end of the wire with the tip of the electric pen. The light bulb lights up, indicating that the wires are connected.
Measure breakpoints.
This function is not very user-friendly, especially for multi-core cables, which cannot be measured and are not sensitive.
Although this type of electric pen directly displays voltage, its accuracy is questionable. Many electrician friends have reported that sometimes they are completely inaccurate, and even make misjudgments.
The light is too strong to see clearly, and the light is too dim to see clearly. The reading sometimes fluctuates, which is its shortcoming. So I usually don't use a digital pen.
Sound and light alarm induction pen.
This type of electric pen is a new product that has been released in recent years. It is very convenient to determine whether an object is charged, and it is easy to distinguish between neutral and live wires. It is not limited by environmental lighting factors, especially for measuring breakpoints, which is very practical. The disadvantage is that it does not display voltage, at least so far, I have not used this function myself.
This type of electric pen has a plastic casing that reduces the possibility of electric shock. It's super easy to use. When measuring, turn on the power first, or press and hold the power button directly. If the electromagnetic field is strong, it will sound an alarm even without touching charged objects, which indirectly reduces the possibility of charging.
In my personal experience, all three types of electric pens have their own strengths, but they can only test whether an object is charged and cannot accurately determine the voltage. When we need to measure the accurate voltage of a charged object, a multimeter is still reliable.
