What distinguishes an analog multimeter from a digital multimeter
An electrical measuring device called a multimeter is used to measure electrical quantities like voltage, current, and resistance. Multimeters differ from one another in terms of size, precision, accuracy, and measurement characteristics. In order to diagnose electrical devices and circuits, multimeters are generally utilized by electricians, engineering students, and amateurs. Analog and digital multimeters are the two primary categories of multimeters.
Analog Multimeter
The earliest kind of multimeter is an analog multimeter. Although it features a hand that moves along the scale, reading it is challenging. The fact that it is affordable and delicate is a benefit. Compared to digital multimeters, analog multimeters are more sensitive and can detect even minute variations in readings.
A coil sandwiched between two permanent magnets and topped by a needle makes up an analog multimeter. The permanent magnet rotates when current is applied to the coil, which produces a magnetic field that interacts with the permanent magnet's magnetic field. The pointer slides down the scale as the coil turns. The coil's angle of rotation is influenced by the amount of current passing through it. A galvanometer, which has a very low resistance and is more sensitive than a digital multimeter, is another name for an analog multimeter. Avoid full scale deflection (FSD) at all costs, though.When the current exceeds the range that the coil deflects, it starts to burn the coil, causing damage to the meter.
Digital multimeter
A digital multimeter is a device that can measure a number of parameters and show the results on an LCD screen. Digital multimeters, as opposed to analog multimeters, show digital computations, which makes it simpler to read measurement data. On the other hand, an analog multimeter has a quick response time because it displays a reading without performing any computations.
A digital multimeter has an LCD, a rotary dial, and multiple ports. The dial contains the internal circuitry, which is connected by a circle of concentric rings. Dial knobs are used to activate circuits for specific measurements. A digital multimeter has a microprocessor embedded in it to calculate the readings. However, the input voltage or current is in analog form. Therefore, an ADC (Analog to Digital Converter) is included to convert the reading and display it on the LCD screen. Unlike the pointer scale on an analog multimeter, the LCD makes measurements easy to read. In addition, the DMM has overload protection when the measurement is out of range.
