Date：2021-11-02 14:39:25

Electrical performance is usually defined in the rated voltage, current, active power, reactive power, resistance, capacitance, inductance, conductivity and other performance indicators of electrical components. Semiconductors cover a wider range, such as DC amplification, AC amplification, rectifier current, reverse breakdown voltage, forward conduction voltage, junction capacitance, noise figure, characteristic frequency, cut-off frequency, dissipated power, etc. The electrical performance test includes the basic parameter test of conductor or insulation quality, such as conductor resistance, insulation resistance, correct value of dielectric loss angle, capacitance, etc. The higher the working voltage of the cable, the stricter the requirements for its electrical performance. View >>

Date：2021-11-01 18:26:32

Voltage withstand test is one of the main methods to test the overvoltage withstand capacity of electrical appliances, electrical equipment, electrical devices, electrical circuits and electrical safety appliances. The withstand voltage test is to detect the leakage current flowing through the insulation system of the tested object and apply it to the insulation system at a voltage higher than the working voltage; while the power leakage current (contact current) is to measure the leakage current of the tested object under the most unfavorable conditions (voltage and frequency) under the normal operation of the tested object. In short, the leakage current of voltage withstand test is the leakage current measured without working power supply, and the power supply leakage current (contact current) is the leakage current measured under normal operation. View >>

Date：2021-10-29 17:41:12

The process that the surface of solid insulating material gradually forms a conductive path under the combined action of electric field and electrolyte is called leakage marking. The ability of insulating material surface to resist leakage scratch is called resistance to leakage scratch. View >>

Date：2021-10-29 17:24:00

Measuring the insulation of electrical equipment is a work often carried out by power operators. Qualified insulation is an important index whether electrical equipment can be put into operation. Insulation is a safety measure to isolate or wrap the charged body with non-conductive substances to protect against electric shock. Simply put, the insulation resistance of electrical equipment is the ability to isolate voltage. Insulation test is a test to test the dielectric strength of insulating materials or insulating structures of electrical equipment. The purpose is to check the safe operation of products and equipment and prevent dangerous accidents caused by short circuit. View >>

Date：2021-10-29 17:05:00

Grounding resistance is an important parameter used to measure whether the grounding state is good. It is the resistance encountered by the current flowing from the grounding device to the earth and then flowing through the earth to another grounding body or spreading to a distance. It includes the resistance of the grounding wire and the grounding body itself, and the contact resistance between the grounding body and the earth, And the earth resistance between the two grounding bodies or the earth resistance from the grounding body to infinity. The grounding resistance directly reflects the good contact between the electrical device and the "ground", and also reflects the scale of the grounding grid. The concept of grounding resistance is only applicable to small grounding grid; With the increase of the floor area of grounding grid and the decrease of soil resistivity, the role of inductive component in grounding impedance is becoming larger and larger. Large grounding grid should adopt grounding impedance design. View >>

Date：2021-10-29 15:23:00

Contact resistance test, also known as ductor test, measures the resistance of electrical connections - terminals, connectors, connectors, bus sections or cable connections, etc. Such measurements are made on components such as connectors, relays and switches. Contact resistance test can understand the connection quality and conductive characteristics of the line, so as to avoid dangerous overheating of the contact. View >>

Date：2021-10-28 16:57:26

The electrical performance test includes the basic parameter test of conductor or insulation quality, such as conductor resistance, insulation resistance, correct value of dielectric loss angle, capacitance, etc. The higher the working voltage of the cable, the stricter the requirements for its electrical performance. View >>

Date：2021-10-28 16:33:00

We should know that X-ray has strong penetration. It is a kind of ray that cannot be seen by human eyes but can penetrate objects. This penetration can penetrate many substances that are opaque to visible light, such as ink, paper, wood, electronic equipment, etc. It produces different absorption or scattering characteristics of rays according to the different composition, density and thickness of the inspected workpiece, so as to obtain the judgment of the quality, size and characteristics of the inspected workpiece. The following contents are sorted out by the core detection network for your reference. View >>

Date：2021-10-28 15:36:00

What is X-ray testing? X-ray testing is an experimental technology that uses X-ray technology to observe, study and inspect the microstructure, chemical composition, surface or internal structural defects of materials. Such as X-ray powder diffraction, X-ray fluorescence spectrometry, X-ray photography, X-ray topography, etc. X-ray has been widely used in radiology as one of the five conventional detection methods in industry. This paper collects and arranges some X-ray data, hoping that this paper can have great reference value to all readers. View >>

Date：2021-10-27 18:05:49

In the formal industrial production, there are special component screening and testing workshops, equipped with many general and special screening and testing equipment and instruments, but for amateurs, these conditions cannot be met. Even so, they must not give up the screening and testing of components, because many electronic enthusiasts use mail orders, including authentic products, There are also defective products, most of which are surplus or profit products. For example, they are not screened and tested before installation. Once welded into the printed circuit board, it is found that the circuit can not work normally, and then check it. It will not only waste a lot of time and energy, but also easily damage the components and printed circuit board. This paper has collected and sorted out some materials, and I hope this paper can be of great reference value to all readers. View >>