QA& Question: How to fix incorrect readings on a multimeter When using a multimeter to read voltage, you may notice that the voltage readings fluctuate wildly or are incorrect on a known voltage source. This is often a sign that the internal fuse has blown. At this point, you need to test the fuse for … Read more
Click on the above ” Technical Training “, select “Pin Public Account“ 160,000+ followers on the WeChat platform for industrial control: technical sharing, learning exchange, industrial control videos Tools/Materials:1. Analog multimeter2. AC contactor with three wiresMethod/Steps:1. We know that household 220V AC is very dangerous; as long as you do not directly touch the wire … Read more
For a single-phase motor, connect one probe to ground and measure the resistance of the motor’s starting, running, and common windings. The resistance should be infinite or close to infinite. If there is no resistance or the resistance is very low, it indicates that the motor is faulty. Then measure the resistance of the three … Read more
Content Overview The frequency converter is an electrical device. For safe operation, ensure that the frequency converter is powered off, and wait for more than 5 minutes after disconnection. Additionally, the input power lines R, S, T and output lines U, V, W must be removed before proceeding! ▲ Frequency Converter Main Circuit Diagram Module … Read more
Electrical Equipment Classroom Now Open! Let’s Learn Together The stable operation of railway signal equipment is directly related to the safety and efficiency of railway transportation. This requires our signal personnel to have solid professional knowledge and technical skills. Learning is endless, and action leads to far-reaching results. The signal professional “make-up class” at Urat … Read more
Search on WeChatTechnical Training01Introduction to Digital Multimeter Digital measuring instruments have become mainstream due to their high sensitivity, accuracy, clear display, strong overload capacity, portability, and ease of use. ▲ Figure 1 Below, we will use this type of digital multimeter as an example to briefly introduce its usage methods and precautions.02Appearance of Digital Multimeter … Read more
Now, digital multimeters are cheap and practical, and I don’t need to elaborate on their benefits. However, there’s one issue that has been bothering me: the high battery consumption. Fortunately, with the development of technology and components, I can now replace that annoying 6F22 battery. Friends with the same problem might as well give it … Read more
[Tip] Click the blue text below the titleElectrician Home to follow For business cooperation, please contact QQ: 2226701662 For more exciting consultations, please follow Electrician 365 (diangong365) Electrician Home QQ Group: Group 1: 468193845 Group 2: 522898769 The multimeter is one of the indispensable tools for automotive repair technicians. Early multimeters had very simple functions, … Read more
Before measuring circuits with a multimeter, understand 5 basic circuit concepts. ■ Circuit: Also called a loop, it refers to a closed circuit that runs from one end of the power source through the load and finally returns to the other end of the power source. ■ Open Circuit: Also called a break circuit, when … Read more
Use the unidirectional conduction characteristics of the parasitic diode inside the MOSFET to determine its health. Step 1: Short-Circuit the Three Pins for Discharge The purpose of this step is to discharge the parasitic capacitance inside the MOSFET to prevent any voltage difference, which could cause erroneous measurements. Step 2: Measure the Internal Diode Set … Read more