How To Check Resistor In Pcb

Power off the circuit containing the resistor you wish to measure. Or when placed in short mode of multimeter there will be an alarm if it is shorted.

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Step 1 remove power from the circuit containing the resistor.

How to check resistor in pcb. In order to test a resistor in a pcb board. Printed circuit board pcb is the common name that is used for these electrical boards. Measure the resistance value.

In history pcbs were been developed by going through a complicated procedure of point to point wiring and these circuits were highly exposed to get failure or damage. To test a capacitor in a pcb one end of the capacitor should be removed from the circuit. This can be done by unplugging it from the mains or by removing the batteries if it is a portable device.

Generally the resistor value will be relatively accurate when it is took down from the pcb board or at least one terminal of the resistor is not soldered on the pcb board. Never measure a resistor in a circuit with a live current running through it. On printed circuit boards pcbs which serve as platforms for building the mass produced circuits commonly found in computers and other electronic systems you may have trouble recognizing the individual circuit componentsthats because manufacturers use fancy techniques to populate pcbs with components aiming to eke out efficiencies and save space known as real estate on the boards.

Turn the multimeter dial to the resistance setting. Discharge any capacitors in the circuit by touching the leads of a spare high wattage resistor to the leads. The power supply of dc voltage should match the range of the capacitor so as not to overload the device.

If it shows zero it is shorted. Keep in mind that some devices still can be charged with a potentially harmful voltage until minutes after removing its power1step 2 isolate the resistor from the circuit. An attempt to measure a resistor that is still connected to the circuit can yield an incorrect calculation as part of the circuit might also be.

In your pcb identify the resistor to be checked and place your multimeter in resistance measurement mode.

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