What is Multimeter?

A multimeter is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter can measure voltage, current, and resistance.

Analog multimeter use a micro ammeter with a moving pointer to display readings. Digital multimeter have a numeric display, and may also show a graphical bar representing the measured value. Digital multimeter are now far more common due to their lower cost and greater precision having obsoleted analog multimeter.

A multimeter can cost between Min ₹300 to Max ₹10,000.

Multimeter Functions:

Multimeters are capable of taking different readings, depending on the model. Basic testers measure voltage, amperage, and resistance and can be used to check continuity, a simple test to verify a complete circuit. More advanced multimeters may test for all of the following values:

• AC (alternating current) voltage and ampere
• DC (direct current) voltage and ampere
• Resistance
• Capacity
• Conductance
• Decibels
• Duty cycle 
• Frequency
• Inductance
• Temperature

Accessories or special sensors can be attached to some multimeters for additional readings, such as:

• Light level
• Acidity
• Alkalinity
• Wind speed
• Relative humidity

How to Use Multimeter?

The basic functions and operations of a multimeter are similar for both digital and analog testers. The tester has two leads—red and black—and three ports. The black lead plugs into the "common" or say negative port. The red lead plugs into either of the other ports, depending on the desired function.

After plugging in the leads, you turn the knob in the center of the tester to select the function and appropriate range for the specific test. For example, when the knob is set to "20V DC," the tester will detect DC (direct current) voltage up to 20 volts. To measure smaller voltages, you would set the knob to the 2V or 200mV range.

To take a reading, you touch the bare metal pointed end of each lead to one of the terminals or wires to be tested. The voltage (or other value) will read out on the tester. Multimeters are safe to use on energized circuits and equipment, provided the voltage or current does not exceed the maximum rating of the tester. Also, you must be careful never to touch the bare metal ends of the tester leads during an energized test because you can receive an electrical shock.