What is the difference between a digital multimeter and a pointer multimeter?
1, different definitions
Digital multimeter: digital multimeter, a multi-purpose electronic measuring instrument that generally contains functions such as an ammeter, voltmeter, ohmmeter, etc. It is sometimes referred to as a multimeter, multi-meter, multi-meter, or tri-meter.
Digital multimeters are available in portable units for basic troubleshooting, as well as bench-placed units, some with resolutions up to seven or eight digits.
A digital multimeter (DMM) is an electronic instrument to be used in electrical measurements. It can have many special functions, but the main function is to measure the voltage, resistance and current, digital multi-meter, as a modern multi-purpose electronic measuring instruments, mainly used in physical, electrical, electronic and other measurement fields.
Pointer multimeter: Pointer multimeter is a multifunctional, multi-range measuring instrument, general multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and some parameters of semiconductors (e.g. β).
2,Different working principles
Digital multimeter: multimeter measurement of voltage, current and resistance function is partially achieved through the conversion circuit, and current, resistance measurement are based on voltage measurement, that is to say, the digital multimeter is based on the expansion of the digital DC voltmeter. The converter converts the analogue voltage, which changes continuously over time, into a digital quantity.
Then the digital quantity is counted by the electronic counter to get the measurement result, and then the measurement result is displayed by the decoder display circuit. The logic control circuit controls the coordinated work of the circuits and completes the entire measurement process in sequence under the action of the clock.
Pointer multimeter: the basic working principle of the multimeter is to use a sensitive magneto-electric DC ammeter (microampere meter) as a meter head. When a small current passes through the head, there will be a current indication. However, the head can not pass large currents, so it is necessary to connect some resistors in parallel and series on the head for shunt or voltage reduction, so as to measure the current, voltage and resistance in the circuit.
3,Different methods of use
Digital multimeter: digital multimeter is relatively speaking, belongs to a relatively simple measuring instrument. In this article, the author will teach you the correct use of digital multimeter. From the digital multimeter voltage, resistance, current, diode, transistor, MOS field effect tube measurements and other measurement methods to start, so that you better master the multimeter measurement method.
