Circuit testing is a quick and easy way to diagnose electronic device malfunctions. Tools like multimeters and test lights determine if electric current can travel through a circuit, while the In-Circuit Test checks all components on a circuit board.
When electronic devices malfunction, there are ways to find the cause of the problem. The circuit test is often the first diagnostic done on an electrical device that has stopped working. A quick and relatively easy test to perform, circuit testing can be performed with simple tools such as a multimeter or test light. You can also use a more complex tool like the In-Circuit Test.
The circuit test determines whether electric current can travel through a circuit. Resistance, measured in ohms, is the measure of resistance in a circuit. A measurement of 0 ohm means there is no resistance. The current flows freely without obstacles. If the reading is infinite ohms then there may be an unintentional break in the connection.
The multimeter is a common tool used in circuit testing. Multimeters have two probes and a digital or analog display. This simple device is used to determine whether electric current travels from one end of a circuit to the other. If the current reaches its destination, the multimeter will register that there is 0 ohms because there is no break in the circuit or no resistance. If the current can’t pass, the device will register that there are infinitely many ohms, meaning that electric current isn’t traveling from one end to the other.
Test lights can also be used to determine if electricity is flowing through a circuit. The principle of the test light is the same as that of the multimeter. Two electrodes, which are connected to a light bulb, are placed in a circuit. These probes can be placed anywhere in the circuit that is supposed to conduct electricity. The bulb will light up if there is continuity between the two connection points. Many of these tools are made with sharp probes, which allow you to test the circuit through an insulated wire.
A more complex tool used in circuit testing is the In-Circuit Test (ICT). This tool determines whether electricity is passing correctly through all of the components on a circuit board, either to make sure the board was built correctly or to determine if it has been damaged. These tools contain a number of testers, sometimes as many as 1000, who feed information to a computer for analysis.
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