A digital multimeter is a test instrument that measures two or more electrical quantities, most notably voltage (volts), current (amps), and resistance (ohms). It is a common diagnostic instrument used by personnel in the electrical and electronic sectors. A multimeter can also measure temperature, sound, and light.
Digital multimeters use LEDs or other indicators to show the result of each measurement. They provide a quick way to check several parameters at once, which saves time for technicians who have to perform many tests on equipment to find problems with it.
These instruments can be divided into three main categories based on the type of measurements they can do: voltage meters, ohmmeters, and function testers.
Voltage meters can measure overvoltages or undervoltages above or below a specified level. These ranges usually go from 9 volts to 60 volts or higher for automotive applications. Digital voltmeters display the value of the voltage directly, without having to first convert it into amperes using a formula. This makes them easy to use but they cannot measure currents lower than 1 milliamp.
Ohmmeters can measure resistances from 10 megohms to 0.01 megohm. They usually have ranges of 10 megohms to 100 kilohms or more.
A multimeter is an electrical instrument that is the most often used piece of test equipment for any electronic expert and engineer. A multimeter is primarily used to measure voltage, current, and resistance, which are the three basic electrical properties. A multimeter can also measure capacitance, inductance, and conductance when these quantities are very small.
Multimeters are used in electricity and electronics work to test circuits and components before they are built into something larger or more complex. For example, a circuit designer might use a multimeter to check the voltage of each battery before putting it into an appliance. If any batteries are dead, they should be removed before continuing with the design process.
Multimeters are also used by home improvement professionals and hobbyists to test wiring before performing work on houses or buildings. They are particularly useful because many household appliances have voltage sources that could kill a person if they were accessed without proper precautions. Multimeters allow these hazards to be detected before any damage occurs.
In addition to checking voltage, many modern multimeters can measure amperes (amps), milliamps (mams), and ohms. Some can even detect magnetic fields!
Multimeters are available from high-end specialty shops and online retailers. They usually cost between $30 and $100.
Analog or digital multimeter is the correct answer. Multimeters are instruments that are used to measure current, voltage, and resistance. The main distinction between the two is the display. An analog multimeter displays the value with a needle, whereas a digital multimeter displays the data as numbers on a screen. Both types of multimeters can measure very low voltages and currents, but they work differently at high levels. An analog multimeter gives a full scale reading, while a digital multimeter shows a number instead. For example, an analog multimeter can read from 0 to 10 volts, while a digital multimeter can only read numbers above zero.
Multimeters have several different uses. A technician will often use more than one type of meter in order to make sure he does not miss any parts of the circuit. For example, if there is a problem with a wiring junction, the technician will first use a voltmeter to make sure that voltage is not present at the joint. If it is not, then he or she knows that the issue is with one of the other circuits down the line from this point. Then the technician would proceed with a ohmmeter to check the continuity of wires at each step of the way until the source of the problem is found.
In science labs, students often use multimeters to test components such as batteries, light bulbs, and transistors.