The difference between an analog multimeter and a digital multimeter is as follows
A pointer multimeter is a multifunctional and multi range measuring instrument. Generally, a multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance, and audio level. Some can also measure AC current, capacitance, inductance, and some parameters of semiconductors.
A digital multimeter is a multi-purpose electronic measuring instrument that generally includes functions such as an ammeter, voltmeter, ohmmeter, etc. It is sometimes also referred to as a multimeter, multimeter, multimeter, or multimeter.
Digital multimeters have portable devices for basic fault diagnosis, as well as devices placed on workbenches, some of which can reach a resolution of seven or eight digits.
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.
So, what is the difference between a pointer multimeter and a digital multimeter? Below is a detailed explanation for everyone:
1. The reading accuracy of a pointer multimeter is poor, but the process of pointer oscillation is relatively intuitive, and the amplitude of its oscillation speed can sometimes objectively reflect the size of the measured object (such as the slight jitter of the TV data bus (SDL) during data transmission); The reading of a digital multimeter is intuitive, but the process of digital changes looks messy and difficult to observe.
2. A pointer multimeter usually has two batteries, one with a low voltage of 1.5V and the other with a high voltage of 9V or 15V. The black probe is the positive terminal relative to the red probe. A 6V or 9V battery is commonly used for digital watches. In the resistance range, the output current of the pointer multimeter is much larger than that of a digital meter. Using the R × 1 Ω range can make the speaker make a loud "click" sound, and using the R × 10k Ω range can even light up the light-emitting diode (LED).
3. In the voltage range, the internal resistance of a pointer multimeter is relatively small compared to a digital meter, and the measurement accuracy is relatively poor. In some high-voltage microcurrent situations, it is even impossible to measure accurately because its internal resistance can affect the tested circuit (for example, when measuring the acceleration voltage of a TV cathode ray tube, the measured value may be much lower than the actual value). The internal resistance of the voltage range of a digital multimeter is very high, at least in the megaohm range, and has little impact on the tested circuit. However, the extremely high output impedance makes it susceptible to the influence of induced voltage, and the data measured in some situations with strong electromagnetic interference may be false.
4. In short, pointer multimeters are suitable for measuring analog circuits with relatively high current and high voltage, such as televisions and audio amplifiers. Digital multimeters are suitable for measuring low voltage and low current digital circuits, such as BP machines, mobile phones, etc. Not absolute, you can choose a pointer multimeter or a digital multimeter according to the situation.
