How to use a muiltimeter to test for resistance and resistors

hello again this is part two of the six part information to be posted on this blog so as i share more information with you all i hope you find it insightful and informative i will also be sharing some lovely videos with you all that will help you understand this topic as best as possible. so today we will be looking at how to test resistance and resistors using a mulitimeter and since i dont want to overload you with too much information i'll try to make this information as short and as easy to understand as possible.
so first as always we will be looking at what are resistors and resistance.Resistance is the opposition that a substance offers to the flow of electric current. resistance is always represented by the capital R. The standard unit of resistance is the ohm.






Now will be talking about how to test for resistance.




Resistors regulate the amount of current flowing in an electronic circuit. Resistors present a resistance, or impedance, to the electrical circuit and reduce the amount of current that is allowed to flow.






Step 1.




First remove power from the circuit in the resistor. This can be done by unplugging it from the power supply's or by removing the batteries if it is a portable device. Always keep in mind that some devices still can be charged with a harmful voltage until minutes after removing its power.




















step 2.



Remove the resistor from the circuit. if one attempts to measure a resistor while it is still connected to the circuit you could be given an incorrect calculation.Disconnect one end of the resistor from the circuit. It does not matter which end of the resistor is disconnected. Disconnect the resistor by pulling on the resistor. If the resistor is soldered in place, melt the solder with an electronic grade soldering iron and pull the resistor free using small needle nose pliers.






step 3




take a good look at the resistor. If the resistor shows signs of blackening or charring, it may be damaged by excess current flow. A resistor that looks blackened or charred should be replaced and discarded.










step 4







The resistor value will be printed on the resistor. Smaller resistors may have their value indicated by color coded bands.
Always note the resistor tolerance. No resistor is precisely the value indicated on it. The tolerance indicates how much the printed value may vary and still be considered a properly sized resistor.


step 5






Ensure that the muitimeter comes on and does not indicate a low battery condition.
Set the adjustable scale of the mulitmeter to the next setting higher than the expected resistor value.






step 6




Connect the 2 leads of the muiltimeter to the 2 legs of the resistor. Resistors have no polarity, so it does not matter which muiltimeter lead is connected to which resistor leg.











step 7
Determine the actual resistance of the resistor. Read the result shown on the multimeter properly and wait for the reading to stop fluctuating to get a good reading.



step 8
Now we can reattach a resistor that gives an accurate reading. Reconnect it to the circuit by pressing it back into place if you pulled it free with your fingers. If the solder joint had to be melted and the resistor had to be disconnected using pliers, melt the solder with the soldering iron and use the needle nose pliers to push the resistor back in to place.



step 9
Here is the last step to testing for resistance. replace a resistor that measures outside of the acceptable value range. Discard the old resistor. Please note that replacing the malfunctioning resistor will not necessarily fix the problem, however if the resistor fails to work, the source of the problem should be sought elsewhere in the circuit.

• Reference : article. date retrieved November 13.2017,http://www.techrepublic.com/article/how-to-use-a-multimeter-to-test-resistors/5034314