1. Introduction The alarm system with rotating light project is a typical embedded system application that combines sound alarms and visual indicators. It is widely used in various scenarios such as security monitoring, emergency evacuation, traffic signals, and entertainment devices. Based on the 8051 microcontroller, it provides an integrated sound and visual alarm solution, enhancing … Read more
The first pointer meter used to detect current was called a galvanometer, invented in 1820. When used in conjunction with a Wheatstone Bridge, it can compare an unknown resistance and voltage to known voltages and resistances, thereby measuring related voltages, currents, and resistances. This method of measurement in the laboratory is time-consuming and labor-intensive, making … Read more
The digital multimeter is a powerful assistant for measuring electrical signals. Although it is called a “universal” meter, its common functions are limited to measuring voltage, current, and resistance. Voltage and current measurements also include AC and DC ranges. In addition, some multimeters can measure inductance, capacitance, continuity, diode forward voltage, transistor current gain, counting … Read more
China’s High-Speed Rail Goes Global, Railway College Achieves the Future -Click the blue text above to follow the official WeChat account of Xi’an Railway Technician College’s Academic Affairs Office- Today, let’s learn how to use a multimeter with the students from Class 34 of the Fall 2020 Pre-College Mechanical Inspection.First, the teacher presented the knowledge … Read more
★ Digital multimeters are widely used in people’s daily life and study due to their simplicity, digital display, ease of operation, and strong anti-interference capabilities. This article briefly describes the common faults encountered during the use of digital multimeters and provides some daily handling methods. 1. Several Common Fault Analysis Methods for Digital Multimeters 1.1 … Read more
Measuring DC Voltage with a Multimeter (Task: Measure 9V Battery, 1.5V Battery) (1) When measuring DC voltage, identify the positive and negative terminals (the red probe connects to the positive terminal “+”, and the black probe connects to the negative terminal “-”). Connect the multimeter in parallel to the circuit being tested. Before measuring the … Read more
This article mainly introduces the design principles of digital multimeters and the calculation methods for average value and true RMS value, explaining the defects of the average value calculation method and the calculation method for true RMS value of AC signals superimposed with DC signals. It emphasizes the necessity of using multimeters with true RMS … Read more
Click on “Technical Training” above, and select “Top Official Account“ 160,000+ industrial control professionals follow our WeChat platform: technical sharing, learning exchanges, industrial control videos A multimeter is an essential troubleshooting tool for electrical maintenance personnel. The phrase “one person, one pen, one meter” vividly illustrates the basic requirements for electrical workers: electrician + test … Read more
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A new colleague joined the company, graduated in mechatronics, fair-skinned, a bit tall and thin, looking quite energetic. As an experienced electrician familiar with the environment and equipment at the unit, the leadership asked me to take him around for a few days to help him get acquainted. Perhaps being new to the field, he … Read more