Is it correct for a low voltage electroscope to test a voltage of 500 volts?

Low-voltage electroscope.

Measuring 500V voltage is incorrect, it is possible to use a low-voltage voltage tester, but it should not be used beyond 500V.

An electroscope is an instrument that detects whether an object is charged or not, and roughly estimates the amount of charge charged, as shown in the figure on the left. When the object to be inspected comes into contact with the conductor at the tip of the electroscope, its own charge is transferred to the foil inside the glass bell. Since the same charge repels each other, the foil will automatically separate and be stretched at an angle.

According to the size of the two foils at an angle, the amount of charge charged by the object can be estimated.

In fact, this is the electric field force experienced by the foil.

These include the repulsion of the eponymous charge on the foil and the attraction of the heteronymous charge on the inner wall of the vessel. If the glass bottle is changed to a metal box to shield against static electricity, the metal rod and the utensils lead out the wire to measure the potential difference between the two points.

By adding a scale to quantify the results, the electroscope can be retrofitted to a more accurate electrometer.

The electroscope was invented by Jean-Antoine Noré of France in 1748 [1] .

The structure of the electroscope is shown in the figure. In the upper part of the picture is a metal ball (or also a metal plate) connected to a metal rod that passes through a rubber stopper, and at the bottom of which hang two very thin pieces of metal foil, enclosed in a glass bottle. During the inspection, the object is put into contact with a metal ball (metal plate), and if the object is charged, a part of the charge is transferred to the two metal foils, and the metal foils open up because they have the same kind of charge and repel each other.

Hello, the low-voltage electroscope can detect voltages below 500V, which is correct. The low-voltage electroscope is generally used to detect whether the electric search gas equipment or line is live, and its detection range is generally 0-500V. The low-voltage electroscope can detect some common low-voltage electrical equipment, such as sockets, lamps, wires, etc., which is simple and convenient to operate, and is a common safety detection tool.

In addition to low-voltage electroscopes, there are also high-voltage electroscopes, and their detection range is generally 500V and above. The high-voltage electroscope is generally used to detect whether the high-voltage electrical equipment is leaking or whether the line is live, and the operation risk is high, and professional personnel are required to operate. It should be noted that the electroscope can only detect whether the circuit is live, but cannot detect the quality and safety of the circuit, so when using electrical equipment, it is also necessary to pay attention to the quality and safety of the circuit to ensure the safety of use.

It is used to inspect low-voltage electrical equipment with a voltage to the ground of 250V and below, and it is also a common tool in the family. The low-voltage electroscope measuring 500V voltage is not the correct source of the image, and it can be tested using a low-voltage hail burner pen.

The wrong low-voltage electroscope can detect voltages below 500V. Analysis: It is okay to use a buried low-voltage voltage tester, but it cannot exceed 500V 81, and the wrong symbol "A" indicates AC power supply.

Analysis: a, AC current 82, wrong measurement of the closed amount of AC circuit active bending state no power

According to your description, low-voltage electroscopes are usually designed to detect the presence of AC voltage in household or industrial electricity, and their rated test voltage is generally below 1000V. If the voltage to be tested is below 500V, the low-voltage electroscope can correctly detect whether the voltage is present or not. Commonly used low-voltage electroscopes are under the action of contact voltage, when the voltage is contained in the circuit, components such as light bulbs or digital displays will emit light or show the magnitude of the voltage.

However, it should be noted that if the voltage to be tested exceeds the rated voltage of the low-voltage electroscope, there will be an error. At this time, it is necessary to choose the appropriate stuffy high pressure detection equipment for detection to avoid accidents caused by errors. At the same time, it is also necessary to pay attention to safety when using low-voltage electroscope to test voltage, and do not touch metal parts to avoid electric shock.

The low-voltage electroscope is used to inspect low-voltage electrical equipment with a voltage to the ground of 1000V and below, and it is also a commonly used electrician safety tool in the family. It is mainly composed of working contacts, buck resistors, neon bubbles, springs and other components.

This electroscope uses current to form a loop through the electroscope, the human body and the earth, and its leakage current makes the neon bubble glow and work. As long as the potential difference between the charged body and the earth exceeds a certain value (above 36V), the electroscope will emit glow, and if it is lower than a value, it will not emit light, so as to judge whether the low-voltage electrical equipment has voltage.

Before use, first of all, you should check the integrity of the electric detector, whether the four components are missing, whether the neon bubble is damaged, and then verify it in the place where there is electricity. When using, be sure to hold the metal hook or tail screw at the end of the cap, the metal probe of the pen tip is in contact with the live equipment, do not go to the electricity test with wet hands, and do not touch the metal probe of the pen tip with your hands.

In addition to being mainly used to check low-voltage electrical equipment and circuits, the low-voltage electric detector can also distinguish between phase line and neutral line, alternating current and direct current, and high and low voltage.

Usually the neon bubble is the fire line for the luminous one, and the zero line for the one that does not shine; However, it should be noted that when the neutral point is displaced, the zero line will also make the neon (noble gas) bubble glow; When the alternating current passes through the neon bubble, both poles of the neon bubble emit light, and when the direct current passes through, only one electrode shines near it; When used to judge the voltage level, when the neon bubble is dark red and slightly bright, the voltage is low; Neon bubbles are yellowish-red, and the voltage is high when the brightness is strong.

Why is it wrong that a low-voltage electroscope can detect voltages below 500V? Because ordinary low-voltage electroscopes (voltage testers) can only detect voltages of 60V and 500V, voltages below 60V cannot be detected.

The nib and tail of the pen are made of metal materials, and the barrel is made of insulating materials. When using the tester, be sure to touch the metal part at the end of the tester with your hands, otherwise, because the charged body, the tester, the human body and the earth do not form a loop, the neon bubble in the tester will not glow, resulting in misjudgment, thinking that the charged body is not charged.

When the voltage tester detects whether a conductor is a live wire or a neutral line, the current through the voltage tester (that is, the current through the human body) i = the total voltage u added to both ends of the voltage tester and the human body, divided by (equivalent to the fractional line) the total resistance r of the voltage tester and the two ends of the human body.

Extended Materials. The low-voltage electroscope is used to inspect low-voltage electrical equipment with a voltage to the ground of 250V and below, and it is also a commonly used electrician safety tool in the home. It is mainly composed of working contacts, buck resistors, neon bubbles, springs and other components. When using low-voltage electroscope, the following aspects should be noted:

1. Before using the low-voltage electroscope, first check whether there is a safety resistance inside, whether there is damage, whether there is water or moisture, and check whether it can shine normally on the live body, and it can be used only after passing the inspection. This is shown in Figure 1.

2. When measuring, the finger holds the pen body of the low-voltage electroscope, the index finger touches the metal body at the tail of the pen body, and the small window of the low-voltage electroscope should be facing your eyes for easy observation, as shown in Figure 2.

3. When testing the charged body under strong light or sunlight, appropriate light protection measures should be taken to prevent the neon tube from being observed to be shiny and causing misjudgment.

The specification of the low-voltage electroscope is generally 400V, can it detect between 401 and 500?

Because the phase voltage to ground is 220 volts.

Above 60v, below 500v, below 500v is wrong.

Below a certain value, it cannot be detected.

Because it can only be used to detect whether there is electricity, not how much voltage there is.