What are the commonly used electrical instruments classified according to measurement methods? According to measurement methods, electrical instruments are mainly divided into direct reading instruments and comparative instruments. Direct reading instrument: Reads directly from the dial according to the position indicated by the instrument pointer, such as an ammeter, multimeter, megohmmeter, etc. Comparative instrument: Compare the measured quantity with a known standard quantity to measure, such as an electric bridge, grounding resistance measuring instrument, etc. Other classification methods (1) can be divided into pointer type, cursor type, digital type, etc. according to the reading method; (2) According to installation methods, it can be divided into portable and fixed installation types; (3) According to the protective performance of instruments, they can be divided into seven types: ordinary type, dustproof type, splash proof type, waterproof type, watertight type, airtight type, explosion-proof type, etc; (4) According to the parameters measured by instruments, they can be divided into: ammeter, voltmeter, power meter, kilowatt hour meter, ohmmeter, megohmmeter, etc. (5) Classified according to the physical properties of the measured quantity, it can be divided into DC meters, AC meters, and AC/DC meters. AC meters are generally scaled based on the effective value of sinusoidal alternating current
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