1. Choose the appropriate megger: If the rated operating voltage of the motor being tested is 380 volts, then we can select a 500V megger. 2. Place the megger flat, perform a short circuit test by shorting the two probes, and if the pointer approaches 0 while cranking the handle, it indicates good condition. 3. … Read more
Section 1: Common Tools for Electricians 1. Common Tools for Electricians 1. Pliers The pliers category includes wire cutters, rubber-handled pliers, needle-nose pliers, tensioning pliers, and wire strippers (as shown in Figure 6-1). Wire cutters are used to cut cold-rolled steel wire. Tensioning pliers are used to tighten lines during the installation of overhead lines … Read more
Second Topic:Difference Between Average Response Principle and True RMS Principle FLUKE’s digital multimeters and clamp meters differ between average response and true RMS. For example, the well-known F15B+/F17B+ series are average response multimeters, while the F115C/F117C series are true RMS multimeters. So what are the differences between them? How should users make their choice? What … Read more
Please follow the WeChat subscription account “Finger Motorcycle” to read the latest information on motorcycle maintenance and repair. Search for ID mscmoto directly in WeChat to follow! The repair process for this motorcycle began ten days ago. A customer came to the shop asking for help with an EFI motorcycle that had no spark from … Read more
1. Introduction In the production of electronic cones, it is necessary to detect a 20kHz electromagnetic navigation signal to unify the reset state of the electronic cone indicator. To reduce detection costs, the LM567[2] audio signal detection chip is used to detect the electromagnetic navigation signal. This DIP8 packaged LM567 is convenient for testing on … Read more
Pioneering Example | Chen Fangyun: Devoted to National Prosperity, Striving Not for Personal Gain. A star in the sky bears his name, And the whole nation mourns for him alone. He lives in a dilapidated hut, Yet he has created 200 billion wealth for China, Those earth-shattering events that affect every Chinese person’s fate, Hide … Read more
1. The Three Elements of Musical Sound 1. Pitch refers to the highness or lowness of a sound, determined by frequency. In physics, the speed of an object’s vibration is described by the frequency, which is the number of vibrations per second. A faster vibration results in a higher frequency and a higher pitch; a … Read more
NIS Research Institute Shenzhen Network and Information Security Industry Association —— For more content, click to read the original article. In recent years, the independent innovation capability of commercial cryptography products in our country has continuously strengthened, and the industrial support capability has been continuously improved. A rich variety of commercial cryptography product systems have … Read more
Click the blue text Follow us Shanghai Society of Civil Engineering As we enter the era of Industry 4.0, with the introduction and practice of concepts such as sensors, wireless networks, 5G technology, information models, general algorithms, and cloud platforms, modern tunnel engineering faces new trends and challenges in achieving digitalization, informatization, intelligence, and even … Read more
Cryptography is the core technology and fundamental support for ensuring network security, playing an irreplaceable role in maintaining national security, promoting economic and social development, and protecting the interests of the people. The vigorous development of “cloud, IoT, mobility, big data, and AI” and the full promotion of 5G, smart cities, and Internet + government … Read more