Saturday, February 12, 2022

What Is the Difference Between Analog and Digital Multimeters ?

Analog and Digital Multimeters

What Is the Difference Between Analog and Digital Multimeters ? - A Multimeter is a device that measures resistance (resistance), voltage, and electric current. As a result, the term "multimeter" is frequently abbreviated as an Avometer, which is derived from the abbreviation of these three units of measurement, namely Ampere (A), Volt (V), and Ohm (O). Some refer to it as a Multitester, which is a Tester or a Test tool that can measure a variety of electrical measurements. Whatever it's called, the tool is the same: a multimeter, which is used to measure electric current, voltage, and electrical resistance.

A multimeter is a measuring or testing tool that is essential for electricians and electronics hobbyists. We can use this tool to measure the value of a resistor, the voltage of AC Power Source or batteries, and the amount of electric current flowing in an electrical or electronic device.

In general, multimeters are divided into two types: analog multimeters (AMM) and digital multimeters (DMM). The primary distinction between the two is the display screen. Analog multimeters display the value or measurement results as needles, whereas digital multimeters display the value or result as a number on the screen. Aside from these main differences, there are also differences in the accuracy factor, reading method, calibration, price, and other factors, which will be discussed further below. But first, let's define Analog Multimeter (AMM) and Digital Multimeter (DMM).

Analog and Digital Multimeters

Definition of Analog Multimeter

An analog multimeter is one that uses a needle scale to measure electrical quantities such as voltage, current, and resistance. When an electric quantity is measured with an analog multimeter, the result is displayed in analog form by using a needle pointer to show the scale value. The scale's reading reflects the quantity to be measured.

A moving coil with a needle that shows each value on the scale produces measurement results in the form of a scale. The basic operating principle is the deflection of the pointer or needle in response to the force applied. This Analog Multimeter is made up of a core in the shape of a drum or cylinder that is sandwiched between two permanent magnets, and a coil winding that wraps around the drum. The coil or winding of the coil is tied to the Pointing Needle. When a certain amount of current is measured through the winding of the coil or coils, a magnetic field is inducted, causing the needle to move to a specific value on the Analog Multimeter scale.

Definition of Digital Multimeter

A digital multimeter is a type of multimeter that displays the electrical quantity measured in digits on a digital display. Analog multimeters have become increasingly obsolete since the introduction of digital multimeters at increasingly low prices. This is due to a number of advantages associated with the use of the digital multimeter itself.

A digital multimeter's main components are a display unit, an encoder, an analog to digital converter, signal conditioning circuitry, and other supporting parts. When measuring the resistance of a resistor, for example, a certain amount of electric current from the multimeter is applied to the resistor whose resistance is being measured. The multimeter will convert the voltage on the resistor into a resistance value and convert it via ADC (Analog to Digital Converter) so that the resistance value of the resistor in question can be displayed on the Digital Multimeter's LCD Display.

Difference Between Analog and Digital Multimeter

The following are some of the primary distinctions between Analog and Digital Multimeters.

  • Analog Multimeter displays results in analog form, eliminating the need for an analog to digital converter. While the Digital Multimeter necessitates the inclusion of an analog to digital converter.
  • The Analog Multimeter has a lower accuracy than the Digital Multimeter. Because Digital Multimeters are more accurate than Analog Multimeters.
  • Analog multimeters are used to measure things like voltage, current, and resistance. While Digital Multimeters can measure impedance, capacitance, and other quantities.
  • Analog Multimeters must be calibrated manually, whereas Digital Multimeters can be calibrated automatically, which is one of their advantages.
  • Analog multimeters are difficult to use and require some effort to comprehend the reading of the needle on the multimeter scale, whereas digital multimeters provide easy measurement as well as readings that directly display the value or measurement results in the form of numbers or digits.
  • Multimeters require components such as encoders, ADCs, LCDs, logic circuits, and others, making digital multimeter circuits more complex than analog multimeter circuits.
  • The Analog Multimeter is physically larger than the Digital Multimeter.
  • During measurements, analog multimeters are less susceptible to electrical noise. Digital multimeters, on the other hand, are more susceptible to electrical interference.
  • The Input Impedance of an Analog Multimeter is variable, so it varies with the measuring range, whereas the Impedance of a Digital Multimeter remains constant across all measuring ranges.
  • The Analog Multimeter pointer will turn left to represent reverse polarity, whereas the Digital Multimeter will display a negative sign to indicate reverse polarity in the measurement.

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