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A digital multimeter is an electric device that measures resistance, current, and voltage in an electrical appliance. Digital multimeters have the following features which make them a better option over the analogue multimeters;
Digital multimeters are used to measure voltage current resistance and continuity of both alternating current and direct current. If you are an electrical work enthusiast, a digital multimeter is a tool that you should not lack. When you meet the device for the first time, it may seem not easy because of the symbols and figures on its face. For starters, below is a list of the symbols and what they stand for.
It is necessary to note that if you measure current higher than 200mA and the red probe is at the port labelled VΩMa, and your multimeter will blow. Some multimeter will have a specific port for current tests, and others will share a port to measure current and volts.
Now with the understanding of the symbol, you can simply conduct a test of your choice. The ACV is among the symbols, and it is what the article will focus on. Its application and the steps to follow when conducting resistance, continuity, voltage, and current in an alternating current circuit.
When you are conducting any test on alternating current, the setting of your multimeter should be at ACV. This is because the AC has no polarity. You will achieve the correct reading. In any case, if you use the DCV your multimeter will blow. Below is how to test for current, continuity, resistance, and voltage in an alternating current circuit.
The first step is to set your digital multimeter to measure ACV or V~ by turning the knob or the dial to measure alternating current. Some of the digital multimeters operate on an auto range mode, where they will select the range automatically. But you should note that they cannot choose alternating current or direct current. You will have to do it manually. They are capable of choosing a range according to the possible volts or current in the circuit. Preferably set it at best possible range to avoid overloading the meter or getting infinite values. Below are the steps that will follow
The data you will get will be in volts. In this setting, you can test for resistance, continuity, and voltage in a circuit. For current, the reading should be amperes, and you have to change settings.
With the data now, a digital multimeter will help you analyze your test. It has a range button that, when pressed during the analysis, will select a fixed and specific range. The hold button will capture and record a stable reading. When recorded, you can access the readings after the test. A max/min button that will help achieve the highest and the lowest readings. You can also set a reference value for your multimeter by pressing the REL button.
Note when conducting a test on an alternating current circuit, you should avoid mistakes such as jacking the positive lead on the amperes port rather than the voltage port and interchanging the probes.
The features I have discussed above may be very different in a particular digital multimeter model. It is advisable to check on the manual provided by your model manufacturers because what I have given is just basics. After you have understood the concept, you will have a good time experimenting and conducting a test on your electric appliances by yourself.
Just a random guy who likes to build things. Providing tool knowledge, appliance/device testing tips, and DIY project info in an easy-to read & non-intimidating style.