A digital multimeter measures amperes, volts, and ohms with a digital LED display. It is more accurate than an analog meter and is used in various fields. When buying one, consider operating resistance, range, and maximum reading capability. Always read the instruction manual before use.
A digital multimeter is an instrument capable of measuring amperes, volts and ohms. It differs from an analog meter, which has a needle and pointer, in that it has a digital light-emitting diode (LED) display. Digital multimeters are typically more accurate than their older analog counterparts. A digital multimeter can have other functions as well; obviously the more expensive meters will have more features, but they all measure the three basic currents.
A digital multimeter, or DMM, can be extremely helpful when trying to troubleshoot an electrical problem. Digital multimeters are always used in the automotive industry, construction, machine repair, computer industry and any other field that involves any kind of electrical work. When buying a digital multimeter, the most important specification to look for is its operating resistance, also called impedance. The DMM becomes part of the circuit under test, thus affecting the current in that circuit.
Another specification to consider when buying a digital multimeter is its range. Regardless of the current being tested, the correct range for that measurement is critical to the accuracy of the measurement. If the operator were testing a 12-volt battery, for example, a range setting of 0 to 25 volts would result in a more accurate measurement than a range setting of 0 to 500 volts. Thankfully, many digital multimeters have an auto range feature, which will automatically set the correct range for the circuit under test; all the operator needs to do is set the digital multimeter to the correct current to be tested and the meter does the rest.
When using a digital multimeter for the first time, it is essential for a person to read the instruction manual that comes with it. Many DMMs require different steps to take measurements; this will involve pressing a few buttons before connecting the cables, and so on. Most digital multimeters require a battery to operate. Your instruction manual will most likely specify which type of battery to use. If the battery type is not specified, alkaline batteries are usually used.
The maximum reading capability of a digital multimeter is also extremely important. This is the maximum amount of current the meter can measure. Usually, the current limit is printed on the face of the digital multimeter. A common limit is 10 amps. This means that if the instrument is connected to a current of 12 amps, the internal fuse will activate to avoid damaging the instrument. Installing a larger fuse will not increase the DMM’s limit; it will only burn it permanently.
Whether testing a battery, measuring the capacitance of a circuit, or trying to locate an electrical short, a digital multimeter is a versatile little device that’s a staple of any toolbox.
Protect your devices with Threat Protection by NordVPN
