Click on “ Technical Training ” above, and select “Pin to Top” Over 150,000 industrial control professionals follow this WeChat platform: technical sharing, learning exchange, industrial control videos In rainy and humid weather, many leakage faults can occur, and I believe electrical workers have thought hard about finding the cause of the leakage. In fact, … Read more
When a cable or its internal components experience a breakpoint failure, it is challenging to intuitively determine the exact location of the breakpoint due to the external insulation covering. Here are several methods to quickly determine the breakpoint of wires and cables: Non-Damaging Cable Method Digital Multimeter Method: First, connect one end of the faulty … Read more
A multimeter, also known as a multimeter, tri-meter, or multi-use meter, is a multifunctional, multi-range measuring instrument. Generally, a multimeter can measure direct current, direct voltage, alternating voltage, resistance, and audio level, while some can also measure alternating current, capacitance, inductance, and certain parameters of semiconductors (such as β). Measuring AC voltage: As shown in … Read more
A bidirectional thyristor (also known as a bidirectional silicon controlled rectifier) is a semiconductor device that can conduct in both directions, widely used in power control and conversion circuits. To ensure its normal operation and performance, it is necessary to measure it using a multimeter. This article will detail how to use a multimeter to … Read more
How to Measure the Quality of Small Capacitors? 1. To test small capacitors below 10pF, since the capacitance of fixed capacitors below 10pF is too small, using an analog multimeter can only qualitatively check for leakage, internal short circuits, or breakdown phenomena.When measuring, you can use the multimeter on the R×10k setting, connecting the two … Read more
Focus on “Jicheng Training”, specializing in automation education for 14 years It is generally believed that the inverter output voltage is 380 volts, and direct measurement should not be a problem. However, in reality, most multimeters cannot obtain correct readings when testing the inverter output voltage, and in some cases, the multimeter may even burn … Read more
Testing Transistors: 1. Testing Small Power Transistors A. Identifying Positive and Negative Electrodes (a) Observe the symbol markings on the casing. Typically, the casing of the diode is marked with the diode symbol, where the end with the triangular arrow is the positive electrode, and the other end is the negative electrode. (b) Observe the … Read more
1. Repair Procedure for Burnt IGBT or Fuse on Circuit Board If the current fuse or IGBT is burnt, you cannot immediately replace the component. You must confirm that the following other components are in normal condition before proceeding with the replacement; otherwise, the IGBT and fuse will burn out again. 1. Visually check if … Read more
Leakage Circuit Breaker / The working principle of the leakage circuit breaker is When functioning normally, there is no leakage current passing through the leakage protector except for the working current in the circuit. At this time, the current flowing through the zero-sequence current transformer (detection transformer) is equal in magnitude and opposite in direction, … Read more
Using a multimeter to distinguish between silicon diodes and germanium diodes The distinction between silicon diodes and germanium diodes can be made using the resistance method, as shown in Figure 6-4. Figure 6-4 Distinguishing between silicon diodes and germanium diodes The conduction voltage of silicon diodes is higher than that of germanium diodes when forward-biased, … Read more