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Digital Multimeter, , Digital multimeter is a test equipment which offers several electronic, measurement task in one tool. It is also known as the voltmeter or Ohm meter, or Volt Ohm meter. The standard and basic measurements performed by, multimeter are the measurements of amps, volts, and ohms. Apart from that,, these digital multimeters perform many additional measurements by using, digital and logic technology. These may include temperature, frequency,, continuity, capacitance etc. The new improved integrated circuits of digital, multimeter are more efficient, faster and work with a large accuracy as, compared to an analogue multimeter., But in the case of additional features, it is not accurate but close to the, reading. A good multimeter is that has continuity and packed with smart, features, including the ability to log and graph data and great for, troubleshooting., , Parts of Digital Multimeter, A multimeter is a simple but useful device which has only three parts; Display, screen, selection knob, ports.

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Display screen-It has illuminated display screen for better visualization. It has, five digits display screen; one represent sign value and the other four are for, number representation., Selection knob- As we know a single multimeter performs so many tasks like, reading voltage, resistance, and current. The selection knob allows the user to, select the different job., Port- There are two ports on the front of the unit. One is the mAVΩ port, which allows the measurement of all the three units: current up to 200 mA,, voltage, and resistance. The red probe is plugged into this port. The other is, COM port which means common and it normally connected to –ev of a circuit, and black probe is plugged into it. There is one particular port is 10A, which is, use to measures large current in the circuit.

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Digital Multimeter Block Diagram, The following figure represents the digital multimeter block diagram with all the, functional blocks.

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The auto-ranging digital multimeter (DMM) only requires you to choose your electrical, quantity you are attempting to measure, make sure you are properly placing your leads, into the correct terminals and then reading the LCD display. Auto-ranging digital, multimeters allow technicians to spend more time getting to the root of a problem, instead of switching and calculating.