What is a digital multimeter?
Digital multimeter is a tool that can measure AMPS, Volts and OHMS. It is different from an analog meter that has a needle and a gauge, in having a digital display-diod (LED) emitting digital light. Digital multimeters are usually more accurate than their old analog counterparts. Digital multimeter can also have other functions; Obviously, more expensive meters will have more functions, but all measure three basic currents.
Digital multimeter or DMM can be very useful when trying to solve the electrical problem. DMM is used all the time in the automotive industry, construction, machine repair, computer industry and any other field that includes any electrical work. When buying a digital multimeter, the most important is the specification to be sought is its operating resistance, also called impedance. DMM becomes part of the tested circuit, so it affects the current in this circuit.
Another specification that needs to be considered when purchasing DMM,is its extent. Regardless of the current tested, the correct range for this measurement is decisive for the accuracy of the measurement. For example, if the operator tested 12 in the battery, then setting the range of 0 to 25 volts would result in more accurate measurement, then setting the range of 0 to 500 volts. Fortunately, it has many DMM automatic range function to set the correct range for the automatically tested circuit; All the operator must do is set the DMM to the correct current tested and the meter does the rest.
For the first time use of DMM, it is necessary to read the manual for the instructions that come with it. Many DMM requires different steps for measurement; This will include pressing certain buttons before connecting the wires and so on. Most digital multimeters require a battery for opera. The guide for instructions is most likely to determine which type of battery to use. If the battery type is not specified, alkaline batteries are usually used.
maximum reading capacity of DMM is also extremely importantthe. This is the maximum amount of current that the meter can measure. Usually the current limit is printed on the face of DMM. The common limit is 10 amperes. This means that if the meter is connected to a current of 12 amps, the internal fuse will appear to prevent damage to the meter. Installation of a larger fuse does not increase the DMM limit; It just burns permanently.
Whether you are testing the battery, measurement of the circuit capacity, or attempt to determine an electric short, digital multimeter is a versatile small device that is the basis of any tool set.