This entry is part 8 of 8 in the series Laboratory Instruments

What is Cathode Ray Tube (CRT)? Explain with diagram
How deflection system in CRT work? Explain with diagram
What is fluorescence, Phosphorescence & Persistence in terms of CRT?
How the circuit of CRO works? Explain working of each block with block diagram
How to use the front panel controls of Cathode Ray Oscilloscope?
How to measure AC/DC voltage & current using CRO? Explain with diagrams
How to measure frequency & phase using Lissajou’s patterns on CRO? Explain with diagrams
How digital multimeter works? Explain with diagram

Before going into the details of how digital multimeter works, let us see its applications. It is widely used laboratory instrument for different types of measurements. Its important features are given below –

It can measure AC/DC voltage, AC/DC current and resistance very accurately.

Accuracy is maximum due to minimum loading effects.

Audio and visual indication for continuity testing in electrical wiring.

Automatic sign indication i.e. (+) or (–) indication.

Automatic null setting.

Working

To understand how digital multimeter works, let us see the block diagram of DMM is given below. The working of each block to measure different types of electrical quantities is as follows.

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