The principle of measuring resistance with a digital multimeter
There are over a hundred types of digital multimeters, which can be classified according to the range conversion method into manual range digital multimeters, automatic range digital multimeters, and automatic/manual range digital multimeters; Classified by purpose and function, it can be divided into low-end popular type (such as DT830 digital multimeter) digital multimeter, mid-range digital multimeter, intelligent digital multimeter, multi display digital multimeter, and dedicated digital instrument, etc; According to their shape and size, they can be divided into two types: pocket sized and desktop.
The functions of measuring voltage, current, and resistance are achieved through the conversion circuit, and the measurement of current and resistance is based on voltage measurement. In other words, a digital multimeter is an extension of a digital DC voltmeter. The converter converts the continuously changing analog voltage into a digital value, which is then counted by an electronic counter to obtain the measurement result. The decoding display circuit then displays the measurement result. The logic control circuit coordinates the operation of the control circuit and completes the entire measurement process in sequence under the action of the clock. A digital multimeter (DMM) is an electronic instrument used in electrical measurements. It can have many special functions, but its main function is to measure voltage, resistance, and current. As a modern multi-purpose electronic measuring instrument, the digital multimeter is mainly used in the fields of physics, electrical, electronics, and other measurement areas.
