Digital ammeter principle and multimeter design and assembly experiment Ammeter is a commonly used electrical measuring instrument. According to the purpose, it can be divided into DC ammeter, AC ammeter, DC voltmeter, AC voltmeter, ohmmeter, multimeter, etc.; these meters can be modified through the meter head. The meter head is a basic electrical measurement tool, which can be divided into digital meter, pointer meter, etc. Any instrument (especially self-assembled instruments) should be calibrated before use, especially before making precise measurements, calibration is essential. Therefore, calibration is a very important technology in experimental technology. This experiment learns how to modify and calibrate the meter by learning the basic knowledge of the meter, and learns welding and assembly technology. This experiment uses the working principle of the digital meter and allows students to design a DC digital voltmeter, a DC digital ammeter, an AC digital voltmeter, an AC digital ammeter and an ohmmeter through the given peripheral circuit. Let students understand the working principle, composition and characteristics of the digital multimeter, and master the principles of circuits such as voltage division and current division, rectification and filtering, and overvoltage and overcurrent protection.
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