Multimeters are commonly used by electricians to test the voltage of circuits that require work and to troubleshoot circuits in order to locate the source of a problem. Testing a circuit with a multimeter prevents it from being subjected to an electric shock, or helps determine the exact source of a problem in an electrical circuit. However, electricians are not the only ones who can use a multimeter, there are multimeters designed for residential use. Commercial multimeters are available in digital and analog formats and can easily be used by anyone; The following sections explain how to use a multimeter to test various features of an electrical circuit.
How to use a multimeter
A multimeter operates using two probes, one red and one black, that connect to the front of the multimeter. The black wire plugs into the COM slot, while the red wire connects to the MAV slot. Above the slots for the wires is a dial to adjust the counter setting, the different parameters are for the different characteristics to be tested. For digital meters, there is a digital display that provides a detailed reading of any aspect of an electrical circuit that is tested; while the analog provides a counter display that moves to show the information on what is being tested. The red and black wires have probes built at the end; the probes are used to connect to the different parts of the circuit to be tested.
Testing Single Circuit Voltage
To test the voltage in a single circuit, first locate the ground wire and power lead of the component being tested. The black probe connects to the ground or the negative wire and the red connects to the positive wire or the power wire. The meter must also be set to read the voltage and the voltage setting must be higher than the voltage produced. There are different settings for the voltage level to be tested; If the circuit produces more voltage than the counter is set to read, the display will show one. For example; If one tests the power of a standard nine-volt battery and the meter displays one, the voltage setting is too low and must be set to read more than nine volts. The test of a battery can be completed with a multimeter by connecting the black probe to the negative terminal and the red probe to the positive terminal.
Resistance of measurement
The resistance of the resistors can also be tested, although it requires the knowledge of the color codes of the resistors. There are several settings to measure the resistance on a multimeter and as for the measurement voltage, the setting should be slightly above the resistance that is produced. Resistance can be tested by applying the black and red probes to separate the legs on the resistor, the reading will be displayed in Ohms. It is important to take into account the factors of tolerance and environment that may affect the resistance rating of a resistor, which can make the reading higher or lower than that specified by color codes .
Current test in simple circuits
In order to test the current of the counter circuit, the probes must complete the series circuit. To connect the meter in series, you can remove the positive lead and connect the black lead to the positive lead, while the red lead is connected where the lead should be. This allows the current to flow from the power source through the device and then continue through the circuit to provide an accurate measurement of the current produced by the circuit.