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测试直流电源有好几种方法，这里我们只介绍几种常用方法。
导通测试：您可以使用万用表的导通模式来完成此项测试。 用万用表表笔接触电源的正极和负极。 如果是导通的，万用表将会发出提示音。 这项测试旨在确定电源是否正在供电以及接线中是否存在断点。
电压测试：您可以使用万用表的直流电压模式来完成此项测试。 用万用表表笔接触电源的正极和负极。 万用表应当显示电源输出的电压。 对比该电压与电源的额定电压，确定其在正确的范围内。
负载测试：您可以将负载（如灯泡或电机）连接到电源，然后用万用表测量电压和电流。 电压应当保持稳定，且处在预期范围之内；电流应当在电源的额定电流范围内。
纹波测试：您可以测量电源输出电压的交流分量。 将示波器连接到电源的输出端子并测量电压纹波。 纹波电压应尽量低，并且在可接受的范围内。
请务必按照操作手册和安全指南的规定谨慎测试电源。 如果您对电子测试不熟悉，最好咨询专业人士或使用事先构建好的测试设备。
An oscilloscope uses a probe to connect to a test point in a circuit and amplify or attenuate the voltage at that point. The subsequent signal path depends on the oscilloscope, but in general, analog circuits condition the signal and analog-to-digital converters digitize it for further evaluation, processing, and analysis. ,
View Full VersionAn oscilloscope captures and displays signals in the time domain, while a spectrum analyzer captures and displays signals in the frequency domain. Sometimes, oscilloscopes have a built-in spectrum analyzer function to make it easy to analyze signals in both the time and frequency domains. ,
View Full VersionWhat is current? In this article, you will learn the difference between current and voltage, as well as the types of current and how to measure it. We all touch and use electricity on a daily basis. However, there are many things about electricity that you may not know. In this article, we will introduce you to the basics of electric current, the difference between electric current and voltage, and the types of electric current and how it is measured in an easy-to-understand...
View Full VersionAlternating current (AC) is a type of electric current whose polarity reverses periodically and whose amplitude varies continuously over time. AC power is often used in businesses and homes because it is cheaper and more efficient to generate and transmit than direct current (DC) power. During transmission, a transformer can reduce power loss by increasing or decreasing the voltage of the AC line. Alternating current (AC) is a form of household electricity -...
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