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What do you think of digital display pencils?

Question 1: How does the electronic pen judge the zero line and the live line? The numerical value shows how to display 220v when measuring the live wire, and the display voltage is lower than 50 V when measuring the zero wire.

Question 2: How does this digital pen look at the voltage? The 20-minute display value of this thing is just a reference, not an accurate voltage value.

Generally speaking, when it is fully displayed, it means that the line is a power phase line and the voltage is relatively normal.

No display, or display 12v, or 12V36V, which is generally a zero line.

Question 3: How to distinguish the live wire from the zero wire with a test pen? First, I will tell you how to read this digital display test pen. Generally, the test pen will display12v \ 48v \1/0v \ 220v \ 380v, but the actual reading depends on the maximum value of the digital display meter, that is, the maximum value of the displayed data.

Followed by live line voltage, that is, single-phase voltage, rated at 220V, neutral line voltage; Generally refers to the neutral line voltage, which is 0 V in equilibrium; Ground wire, as the name implies, the wire directly grounded is 0 V;

Finally, the measured data show that the live wire is generally between 2 10-230, and the neutral wire is generally within 0-24V due to load imbalance, so the ground wire must be 0V, otherwise it will definitely get an electric shock (generally connected to the shell, also called the protection wire).

I hope my answer can help you!

Question 4: What do you think of the difference between digital pen induced breakpoint test and direct test? 1. button description:

(A) DIRECT, the direct measurement button (away from the LCD screen), that is, press this button when using the batch head direct contact line;

(B key) Inductance, an inductance measurement button (near the LCD screen), that is, when touching the line with a screwdriver, please press this button.

Note: No matter how the words on the electric pen are printed, please identify the one far away from the LCD screen as the direct measurement key; Close to the liquid crystal is the sensing key!

2. This pen is suitable for direct detection of 12-250v AC /DC and indirect detection of neutral line, phase line and breakpoint of AC. It can also be used to measure that the switch has no electrical conductor.

3. Direct detection

A. The last number is the measured voltage value;

B. When it is less than 70% of the high interrupt display value, the low interrupt value is displayed;

C. When measuring direct current, touch the other pole with your hand;

4. Indirect detection: press and hold the B key, and put the batch head close to the power cord. If the power cord is charged, the high voltage symbol will be displayed on the display screen of the digital display pen.

5. breakpoint detection: when you hold down the b key and move along the longitudinal direction of the conductor, the place where the display window is not displayed is the breakpoint;

Question 5: Why can't the digital stylus display the accurate voltage value? It should be relatively high!

Question 6: How to use the low-voltage electroscope for digital pencils?

It is used to test low-voltage electrical equipment with a ground voltage of 250V and below, and is also a common electrical safety tool at home. It is mainly composed of working contact, step-down resistor, neon lamp, spring and other parts. The working principle of this electroscope is to use current to form a loop through the electroscope, human body and the earth, and its leakage current makes neon bulbs glow. As long as the potential difference between the charged body and the earth exceeds a certain value (below 36V), the electroscope will emit light, and it will not emit light below a certain value, so as to judge whether the low-voltage electrical equipment has voltage.

Before use, check the integrity of electroprobe, whether the four components are missing and whether the neon bulb is damaged, and then verify it in the place with electricity. Check the electricity only after confirming that the pen is in good condition. When using, be sure to hold the metal hook or tail screw at the end of the pen cap, and the metal probe of the pen tip should contact the charged equipment. Don't check the electricity with wet hands, and don't touch the metal probe of the pen tip with your hands.

Low-voltage test pen is mainly used to check low-voltage electrical equipment and lines, and can also distinguish between phase line and zero line, AC and DC, and the level of voltage. Usually, neon bulbs are fire lines, and those that are not bright are zero lines; However, attention should be paid to neutral point displacement. At this time, the zero line will also make the neon light bulb glow. When alternating current passes through the neon bulb, the two poles of the neon bulb emit light, and when direct current passes through, only one electrode emits light; Used to judge the voltage level, the voltage is low when the neon bubble is dark red and slightly bright; Neon bulbs turn yellow and red, and the voltage is high when the brightness is strong.

2 high voltage electroscope

It is mainly used to test the high-voltage electrical equipment with the ground voltage above 250 V. At present, there are three types widely used: luminous type, acousto-optic type and wind type. They generally consist of three parts: detection part (indicator part or windmill), insulation part and handshake part. The insulation part refers to the part from the metal connecting screw at the lower part of the indicator to the cover retaining ring, and the handshake part refers to the part below the cover retaining ring. Among them, the insulation part and the handshake part have different lengths according to different voltage levels.

When using high-voltage electroscope to check electricity, first of all, we should conscientiously implement the operation monitoring system, with one person operating and one person monitoring. The operator is in front and the guardian is behind. When using electroscope, it must be noted that its rated voltage should adapt to the voltage level of the electrical equipment to be tested, otherwise it may endanger the personal safety of the operator or cause wrong judgment. When checking electricity, the operator must wear insulating gloves and boots to prevent the harm of step voltage or contact voltage to human body. The operator should hold the handshake part under the cover protection ring and check it on the electrified equipment first. During the inspection, the live equipment should be gradually close to the light or sound to verify the integrity of the electroscope. Then test on the equipment to be tested. When erecting multi-layer lines on the same tower, check the low voltage first, then the high voltage, then the lower layer and then the upper layer.

It is important to note that before using the high voltage test pen to check the electricity, you must read the instruction manual carefully to check whether the test is over-cycle, and whether the appearance is damaged or damaged. For example, when GDY high-voltage electric anemometer is taken out of the bag, it is first necessary to observe whether the blades of the electric rotary indicator are off-axis and whether there is an alarm sound. Do not use them if they are off-axis. Then gently shake the electric rotary indicator in your hand, and its blades will swing slightly to prove that it is good. Then, check the alarm part to prove that the sound is good. GS twitch series high-voltage acousto-optic electroscope, before operation, the indicator should be self-checked, so that the indicator can be rotationally fixed on the operating rod, and the operating rod can be stretched to a specified length, and then self-checked can be carried out. Note that the high voltage electroscope cannot detect DC voltage.

During storage and transportation, it shall not be subjected to strong vibration or impact, nor shall it be disassembled without authorization. Do not use in any environment that affects insulation performance, such as rain and snow. Don't expose yourself to the sun in the open air, put it in a dry and ventilated place, and don't wipe or touch it with corrosive chemical solvents and detergents.

Question 7: How to read the digital stylus? Why is there a row of numbers sometimes? 2. It is suitable for direct detection of 12-250v AC /DC and indirect detection of zero line, phase line and breakpoint of AC. It can also measure switches without electrical conductors. 3. Direct detection A. The last number is the measured voltage value;

Question 8: How does a digital pencil read a digital pencil? When testing alternating current, press your finger on the directly detected copper point. When measuring the fire line,12v36v55v110v 220 is displayed, indicating that the voltage is 220v. Displayed as12v36v55v110 means that the voltage is110v; Displayed as 12V36V55 means the voltage is 55V; displaying as 12V36 means the voltage is 36V; It is displayed as 12, indicating that the current is 12 volts.

There should be no voltage on the neutral wire, but it is possible to display a voltage below 55 volts under the condition of connecting useful appliances.

Inductive breakpoint test is used to test where the cable is broken, which is generally not needed.

Question 9: What is123655110220 displayed by the digital stylus? The line you detected shows this array, which proves to be the line of fire. If only half or the other half is the zero line, the set of numbers you said is meaningless. It's an old-fashioned measuring pen, which is of little use.

Question 10: How to use a digital stylus? 1, button description: