Study of Digital Multimeter using webpage


Digital Mutimeter:
A digital multimeter (DMM) is an electronic instrument used to measure several electrical propertiessuch as voltage (volts), current (amps), and resistance (ohms). 
An essential tool for electronics technicians, engineers, hobbyists, and electricians alike, a multimeter is a versatile instrument crucial for troubleshooting, maintenance, and testing electrical systems. With its ability to measure multiple electrical parameters, a multimeter serves as a cornerstone in diagnosing faults, ensuring safety, and verifying functionality in various electronic devices and circuits.One of the primary functions of a multimeter is to measure voltage, allowing users to determine the electrical potential difference between two points in a circuit. This capability is indispensable for assessing the health of power sources, identifying faulty components, and ensuring proper voltage levels in various electrical systems
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Images of Digital Multimeter


   
Invention of Digital Multimeter 
The first device that could be considered a predecessor to the multimeter showed up in 1820. It was a moving-pointer current-detecting device, called a galvanometer. 
Designed only to detect electrical current and could make a compass needle move, the galvanometer was useful in the lab, but very bulky and delicate, so impractical for fieldwork. 
Donald MacadieIn 1920, a British Post Office engineer, Donald Macadie, is credited with inventing the very first multimeter. 
The story goes that he was frustratedthat he needed to carry a bunch of different tools when working on telecom lines, so he createdone tool that could measure amperes, volts, and ohms.
How to use a digital multimeter 
Modern digital multimeters are highly versatile and can make multiple types of measurements and provide graphical output displays, such as trends and statistical charts. 
DMMs are programmable and can communicate with external computers for post-analysis work. 
Notably, they pack a lot of functions into a small benchtop box, typically no bigger than the size of a book. 
Portable handheld DMMs are evensmaller, lighter, and are battery-operated. 
Types of Digital Multimeter 
1.Fluke Digital Multimeter 
2.Clamp Digital Multimeter 
3.Autoranging Multimeter 
Advantages of Digital Multimeter: 
(1)The measurements can be stored and transferred onto another device like a PC. 
(2)Auto polarity functions are included. 
(3)The accuracy is high. 
(4)The range can be selected manually or automatically. 
(5)It provides multifunctionality. 
Disadvantages of Digital Multimeter 
(1)The digital multimeter is expensive. 
(2) If any malfunction occurs in the multimeter itself, it is difficult to diagnose. 
Applications of a Digital Multimeter 
It can be used for testing voltage. We can measure the voltage across the circuit and voltage drop if any. 
It can be used for testing current. The mA scale is useful for that. 
It is used for testing resistance. There is a built-in power source that gets activated when the resistance scale is selected. It is also used for continuity testing. 
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Fundamentals

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HTML-Javascript

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Example

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