Classification of electrical measuring instruments

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Based on different uses: they can be divided into voltmeters, ammeters, power meters, wattmeters, etc； Depending on the type of current, they can also be divided into three categories: DC meters, AC meters, and AC/DC dual-use meters. There are also multimeters that can measure current, voltage, resistance, and other parameters. According to the measurement method, it can be divided into direct-reading and comparative types. Meters that directly indicate the value being measured are called direct-reading meters; examples include voltmeters, ammeters, and power meters ； Meters in which the measured value is compared using a \"standard quantity\" are known as comparative meters, such as balance bridges and compensators. By accuracy: it can be divided into three grades: 0.2 grade, 0.5 grade, and 1.0 grade. The allowable error for instruments of grade 0.2 is 0.2%, while that for grade 0.5 is 0.5%, and so on. Meters with an accuracy of 0.5 grade or higher have high precision and are often used in laboratories for calibrating other instruments. Grade 1 has a lower level of accuracy; it is generally installed in distribution panels and control consoles to monitor the operating conditions of electrical equipment.