How to Measure Ground Resistance with a Multimeter Experiments were conducted using a multimeter to measure ground resistance in different soil types, and the data obtained from the multimeter was compared with that from a specialized ground resistance tester, showing very close results. The specific measurement method is as follows: Find two pieces of 8mm, … Read more
Common Multimeters Correct Usage Be cautious with electrical safety. Common multimeters include analog and digital types: the analog multimeter is a multifunctional measuring instrument based on a mechanical dial, with values indicated by a needle on the dial; the digital multimeter displays values directly in numerical form on a liquid crystal screen and often includes … Read more
1. Targeted Measurement Guidelines 1. Correct Use of the Multimeter Correctly use the multimeter; familiarize yourself with the dial before use. Adjust the two zero position regulators gently. Properly select the terminals; insert the red and black probes into the correct holes. Rotate the switch to the correct range; make sure the range is selected … 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
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
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
Recommended Course:[Shanghai Inspection Institute] “Medical Electrical Equipment 9706 Series Related Standards Promotion” On the 17th, the National Medical Products Administration’s Standardization Center released the GB 9706.1-2020 Test Equipment List, as follows: GB 9706.1-2020 “Medical Electrical Equipment Part 1: General Requirements for Basic Safety and Essential Performance” will be implemented on May 1, 2023. To further … Read more
1. Correct Use of Multimeter To correctly use a multimeter, familiarize yourself with the dial before use. Adjust the two zero position regulators gently. Choose the correct terminal, and insert the red and black probes into the correct holes. Rotate the switch to the correct gear. Choose the appropriate range for accurate measurements. Look at … Read more
RC Parallel Design Between PCB GND and Chassis GND: Principles, Advantages, and Application Comparisons -Compare- Enning EMC Engineering Summary Overview Prospect feed In metal-cased electronic devices, the connection design between PCB GND (signal ground / PCB ground) and chassis GND (enclosure ground / protective ground) directly affects the electrical safety, electromagnetic compatibility (EMC), and signal … Read more
The chassis is made of metal, with a screw hole in the middle, which connects to the ground. Here, a 1M resistor is connected in parallel with a 1nF capacitor to the circuit board ground. What are the benefits of this configuration?In metal chassis devices, the PCB GND (signal ground) is connected to the chassis … Read more