Voltage withstanding refers to the maximum voltage that a PCB can withstand under specified conditions without experiencing breakdown. Breakdown occurs when the voltage exceeds a certain limit, causing the insulating material of the PCB to lose its insulating properties, resulting in a sudden increase in current and circuit failure. Voltage withstand control is a key … Read more
In daily electrical maintenance or motor inspection work, determining the condition of a three-phase motor is a crucial skill. The multimeter, known as the “magic tool” for electrical maintenance, plays a significant role in this process. So, which setting should we use on the multimeter to assess the condition of a three-phase motor? Hello everyone, … Read more
Many electricians habitually use a shake meter to measure the condition of motors in their daily work. This is undoubtedly a common and relatively safe testing method. Today, I will share how to use a multimeter to measure the condition of a motor, so that if a shake meter is not available, you can still … Read more
1. Quick Methods to Determine Motor Condition: 1. Use a multimeter to measure the DC resistance of the motor’s three-phase windings. The closer the results of the three measurements are, the better. A resistance difference within 2% is acceptable. If the difference exceeds 10%, the winding with the lower resistance may have an inter-turn short … Read more
1. Choose the appropriate megger: If the rated operating voltage of the motor being tested is 380 volts, we can choose a 500V megger. 2. Place the megger flat, perform a short circuit test by connecting the two probes together; if the pointer approaches 0, it indicates good condition. 3. Next, separate the two probes, … Read more
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
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
Conformal coatings were originally applied only in high-tech fields of printed circuit boards (automotive industry, aerospace, and maritime). As electronic devices are increasingly used in daily life, consumers are also paying more attention to product quality and reliability. The use of conformal coatings allows manufacturers to effectively improve product quality, and thus they are now … Read more
Technical Article: Resistance and Resistivity of PCB Substrates Ningbo Turbulence Laboratory 01 Insulation Resistance, Volume Resistivity, and Surface Resistivity In engineering, materials are roughly classified into four categories based on conductivity, with PCB substrates being a typical insulating material. Insulation resistance is the resistance value exhibited by insulating materials under direct current (DC) voltage, which … Read more