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Multimeters 101

In most electronics projects, there are a few near essential items you need. One such product is the multimeter. Today's Eio topic is the multimeter.
Analog Multimeter

What is it?

Multimeters are used to measure multiple properties of electronics, most commonly voltage and currents. In its most common usage, people use multimeters to diagnose and narrow down the causes of electrical malfunctions in products such as batteries, power switches, motors, and other electronic components. There are two main types of multimeters.
  1. Analog multimeter (AMM) - these display its values by using a moving needle across a printed scale.
  2. Digital multimeter (DMM) - these display their values using a digital display that shows the numbers for measurements being taken.

Types of Measurements

Digital Multimeter
As mentioned before, multimeters measure multiple electronic characteristics, hence the name "multiple-meter." Three major types of measurements are as follows:
  1. The multimeter first acts as a voltmeter and measures amounts of AC/DC volts flowing in a circuit.
  2. As an ohmeter, the multimeter finds the resistance in a current.
  3. As an ammeter, the multimeter measures current flowing through a closed circuit by interrupting that circuit.

Familiarize Yourself with its Parts

Angel Acevado at Wikihow.com lays out the different parts of a multimeter that you should become familiar with before use. They are:
  • The dial
  • Pointer or needle
  • Arc shaped lines or scales on the meter dial face
  • A selector switch or knob
  • Jacks or openings in the case to insert test leads
  • Test leads
  • Battery and fuse compartment
  • Zero Adjustment
Finally, all multimeters come with a specific sensitivity range, so make sure you buy one with the amount of frequency you wish to measure. Remember: while higher ranges may allow you to measure higher frequencies, they have less precision and accuracy. Check out some popular multimeters on our Eio site:



See also:

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