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直流电源通过线性方法或开关方法将交流（AC）电转换为直流电。 开关电源的效率更高、重量更轻、外形更小巧。 线性电源可以实现更低的噪声，但在现代开关电源面前，这已经不再是一个优势。
An oscilloscope is a test instrument used to capture and display a graph of the waveform of an electrical signal over time. For example, it can graph voltage (y-axis) versus time (x-axis) on its display. Oscilloscopes are powerful tools for designing and testing electronic equipment. They play a very important role in determining whether system equipment components are working properly and which components are malfunctioning. They...
View Full VersionA signal that looks very complex in the time domain behaves quite differently in the frequency domain. Time domain measurements show an impure sine wave. Without frequency domain measurements, it is still impossible to know the source and frequency of the second harmonic. Spectral analysis can show the spectral components individually, thus revealing the source of the interference. The information provided in the time domain (e.g., the signal pulse on...
View Full VersionHow to measure frequency? Measurable Devices, Measurement Methods, and Precautions In everyday life, many people say they don't know much about the frequencies of electrical appliances. However, some electrical appliances have specific compatible frequencies, and using electricity at a frequency that is not compatible with the product may lead to malfunctions, fires, and other risks. In addition, in industrial equipment, there are electrical designed to operate at fixed or variable frequencies...
View Full VersionIn this article, we will describe the basic measurements of an impedance analyzer. Overview An impedance tester is an instrument used to measure AC resistance or impedance. This article will introduce the basic knowledge about impedance, the measurement method of impedance, and how to use the impedance tester. What is impedance? What is impedance? In short, it is "a quantity that indicates the difficulty of the flow of alternating current". ...
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