Digital multimeter, a multipurpose electronic measuring instrument, generally containing ammeter, voltmeter, ohmmeter and other functions, sometimes also known as multimeter, multimeter, multimeter, or three-purpose meter.
Digital multimeters range from portable devices for basic fault diagnosis to benchtop devices with resolutions of seven or eight digits.
Digital multimeter (DMM) is an electronic instrument used in electrical measurement. It can have many special functions, but the main function is to measure voltage, resistance and current, digital multi-purpose table, as a modern multi-purpose electronic measuring instrument, mainly used in physics, electrical, electronic and other measurement fields.
Digital multimeter head is generally composed of A/D (analog/digital) conversion chip + peripheral components + liquid crystal display, multimeter accuracy affected by the head, multimeter due to A/D chip conversion out of the digital, generally known as 3 1/2 digit multimeter,4 1/2 digit multimeter and so on. The pen of the multimeter is generally divided into red and black. When used, the red pen should be inserted into the jack marked with a positive sign (+), and the black pen should be inserted into the jack marked with a negative sign (- or *).