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How to Test Electronics Components

    • 1). Turn the multimeter on, and turn the knob to the resistance setting, usually marked by the Greek letter omega, which is the symbol for resistance. The knob should be on an appropriate setting, for example, It should be at least 220-ohms if such a resistor is being measured. If the resistor's value is unknown, put the knob on the lowest setting and increase it by increments as you are testing.

    • 2). Place a multimeter probe on each lead of the resistor. Record the resistance. Switch the probes around, and record the resistance again.

    • 3). Place the multimeter probes on the leads of other components such as diodes, capacitors and photocells. Record the resistance, switch the probes and then measure the resistance again. Diodes should have a small resistance when the probes are placed one way but not the other. For a capacitor, the resistance should be nearly infinite, or else it is damaged. Photocells should be tested twice: both close to and some distance from a light source.

    • 4). Turn the multimeter to a DC voltage setting. Switch the knob so that it can measure a maximum voltage of at least 2 volts.

    • 5). Put the red probe of the multimeter on the plus side of the battery, and hold the black probe against the minus side. Record the voltage.

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