There are two common digital / analog multimeter: 1.Digital / analog hybrid multimeter. This type of multimeter adds 7 / 2 digits to the analogue multimeter. 2.Digital / analog bar chart double display digital multimeter. This kind of mult…

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When reading information about ATX power supplies, often encounter the words "hot ground" and "cold ground". What is the connection and difference between "hot ground", "cold ground" and "land"? In fact, the terms "hot ground" and "cold gr…