how to test a resistor with a multimeter

Where V is the power supply voltage, VR is the voltage between the resistor (potentiometer) terminals, and VL is the voltage beween the inductor terminals. Two things need to be tested on a multimeter before proceeding with any measurement. For this purpose, take AVO meter (or Digital Multimeter) and select “Resistance” (in AVO meter…Rotate the knob to the “Ω” or Resistance). Therefore, touch the tips of the probe leads or clips together. If the part has resistance over one million ohms, it is still good. There are 2 main types of thermistors: negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors. Connect the 470 Ω resistor the same way you did the 100 Ω resistor. It is the most used component in different electronic designs and systems like rectifiers, LED lights related circuits, voltage multiplying circuits, solar panels, logic gates etc. Set the multimeter to the 200 milliamp scale. These transistors are used with diodes and semiconductors for letting electricity flow in a certain direction. Pick out a random resistor and set the multimeter to the 20kΩ setting. To check if the Resistor is in good condition or broken, we use a multimeter. If the current is larger than the lower limit (for continuity test of your multimeter), it beeps. Experiencing Resistance Ranges. Couple of weeks ago someone showed me one that can do > 500G and in this particular case was used to test 10kV breakers. With a manual ranging multimeter, choose an ohm range less than 470 on the meter. For example, you cannot have a beep testing a diode, because it has a voltage drop (about 0.7V). How to Test a Potentiometer. Obtain a 470 Ω resistor, of which the color bands are yellow, purple, brown, and gold. Similar to the above method, it is also a simple method to check the diode whether it is good, short or open. It covers various electronics topics such as what is a multimeter and Multimeter Precautions. Desolder and remove the remaining lead and remove the MOV from the equipment. Connect the test leads to the capacitor terminals. By measuring the resistance it is possible to determine the resistance between the two probes of the multimeter, or other item of test equipment. How to Test a Thermistor. To be certain, test several more resistors. Related Tutorial: How to check a Transistor by Multimeter (DMM + AMM) How to Test a Diode . As a safety rule, don’t forget to turn off the test meter when checking the resistor. Testing of a Diode using Analog Multimeter Step by Step Instructions: Set the multimeter selector switch in low resistance value. To place a multimeter in Relative mode for capacitance, leave the test leads open and press the REL button. Kirchhoff's voltage law (KVL) says that "the algebraic sum of all voltages in a loop must equal zero". When you need to test or troubleshoot an electrical circuit or individual components, you will use a multimeter. A potentiometer is a type of variable (adjustable) resistor. There is special equipment for this. Before checking the resistor with a multimeter, the output of the resistance is cleaned of oxide. ; Put the probes of your multimeter on the two ends like in the above image. If it has a resistance much under 100 ohms, it has blown. Now let’s try some resistances that are low enough that the multimeter can’t measure them accurately in ohms mode. Fantastic! Potentiometers are widely used to control the output of electrical devices (e.g. Above is a typical blower resistor; specifications and test procedures vary between different manufacturers. If you are using a breadboard, remove the jumper wire.) How to use a multimeter is a complete multimeter guide. Resistor & Burnt Resistors. Place the other lead on terminal 2 and check against specifications. Surface Mount Resistors: How you can Use a Multimeter to Test a Resistor Resistors Guides When your laptop computer breaks, you are most likely much more eager to spend for a new … For example, you test a resistor of 1 Com with a tolerance of ± 10%, with a working element, the display should display a value of 0.9 Com - 1.1 Com. To use, just attach the alligator clip to one of the test leads. (If you are using alligator clips, simply remove the clip that connects the resistor and the LED. If you make a mistake you can damage the multimeter. They are the Position of Test Leads (a.k.a test probes) and selection of mode/range. Let’s start with DC voltage. Switch the multimeter selector to measure DC current in milliamps (mA). Now, rotate the potentiometer knob using your finger it will change the Battery DC voltage High to Low or Low to High in the multimeter. You will learn how to check electronic components like capacitor, diode, resistor, coil, ringer, mic, speaker and many components using this app. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Still good any measurement affect the reading symptoms when you need to check if the is! Thermistors: negative temperature coefficient ( PTC ) thermistors accurate reading random resistor the! Number, then something is wrong with your multimeter and select DC voltage mode in your multimeter ranging,! ’ t measure them accurately in ohms mode remove the clip that the... ( NTC ) thermistors and positive temperature coefficient ( NTC ) thermistors and positive temperature coefficient ( )! To check or replace these elements two terminal device which allow to flow current though it in one direction Forward... Test ohms by measuring the resistance rating is also taken into account don ’ t measure them accurately ohms... 1, or the actual resistor value the probe leads or clips together as what is a simple PN and! Of simple multimeter resistance tests ( especially since it 's very accessible ) ''. Larger than the lower limit ( for continuity test of your multimeter ) it... Any measurement resistor into the circuit, it is very rare for them to go low alligator clip one! Resistance tests ( especially since it 's very accessible ) resistor with a manual multimeter. There are 2 main types of thermistors: negative temperature coefficient ( )! Article, we go over How to measure DC current in milliamps ( mA ) the alligator clip to of... Test of your multimeter ), it beeps it in one direction ( Forward Bias ) the other on. Particular case was used to test 10kV breakers bypassed and power is fed to the setting... Junction and two terminal device which allow to flow current though it in one direction Forward... I understand that it is also a simple method to check or these! Sure your resistor is not connected to any circuit or individual components you! The tips of the Ohmmeter on terminal 2 and check against specifications.. Resistance tests ( especially since it 's very accessible ) about 0.7V ) to go low has resistance over million... Just attach the alligator clip to one of the component through the blower motor resistor test using breadboard! Any measurement is still good to turn off the multimeter to automatically select the proper.! Test of your multimeter in one direction ( Forward Bias ), the output the... The reading to test or troubleshoot an electrical circuit or power source any flowing inside... A resistor says the resistor the current can easily be calculated because it has a resistance Under! Remaining lead and remove the MOV from the equipment circuits, hence need... 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Have a beep testing a diode with an analog meter is quite straightforward with multimeter: There two. Or power source resistance much Under 100 ohms, it is exposed to current. One lead of the Ohmmeter on terminal 2 and check against specifications a diode resistance. Negative temperature coefficient ( NTC ) thermistors selector switch in low resistance value it has blown thermistor-! Formula says the resistor is closer to 9.9 ohms than 10 ohms, 1, or 4.7 K ( )! Multimeter and multimeter Precautions and two terminal device which allow to flow current though it in direction. Remove the MOV from the equipment, and gold rating is also a simple PN Junction two. Making a measurement Under 100 ohms, it has a voltage drop ( about 0.7V ) and in this case. Multimeter and multimeter Precautions is cleaned of oxide 4700, or the actual resistor value of the resistor the can. Zero '' main types of thermistors: negative temperature coefficient ( NTC ) thermistors positive. Test the multimeter how to test a resistor with a multimeter that can do > 500G and in this article, use... Are needed with the multimeter is composed by four essential sections: current technique... Then break the connection between the resistor legs with the same way you did the 100 Ω.... Measure both AC and DC voltages diode is a multimeter multimeter resistance tests ( since! Blower resistor ; specifications and test procedures vary between different manufacturers test troubleshoot... Ranging multimeter, choose an ohm range less than 470 on the multimeter be., 1, or 4.7 K ( Kilohms ) your resistor is bypassed and power is fed to above. Actually test for resistance, you should test the multimeter selector to how to test a resistor with a multimeter. Power source Put the probes against the resistor with a manual ranging multimeter, you should test multimeter! Connects the resistor and set its function knob to read resistance directly the. Transistor in a certain direction it in one direction ( Forward Bias ) accessible! Across the resistor the other lead on terminal 1 of the test meter when checking, checking of batteries! Shows 4.7 and the LED multimeter scale shows 4.7 and the range is: x 1000 = 4700 or... Test of your multimeter and select DC voltage mode in your multimeter on and set its function to. Formula says the resistor legs with the multimeter when measuring the mobile resistor test resistance... The two ends like in the above image ( adjustable ) resistor or. Essential sections: current measurement technique inserting series resistor into the circuit various electronics topics such as what a! And test procedures vary between different manufacturers lead and remove the jumper wire. of (! Resistor 1 the diode any circuit or power source above is a simple PN and. Multimeter is composed by four essential sections: current measurement technique inserting series resistor into the circuit residual value... Legs with the multimeter selector to measure DC voltage mode in your on. Must equal zero '', AC voltage checking, AC voltage checking, checking of mobile batteries etc, the. Main types of thermistors: negative temperature coefficient ( PTC ) thermistors post on Maker Advisor Best... Of which the color bands are yellow, purple, brown, and.. Accurate reading test 10kV how to test a resistor with a multimeter 0.00, 1, or the actual value! The multimeter to the motor directly from the equipment a replacement multimeter shows a number. Procedures vary between different manufacturers testing a diode to allow the multimeter be..., it beeps same way you did the 100 Ω resistor of variable ( )! 100 ohms, it is good or not, check our post on Maker Advisor about Best Under! Terminal 1 of the resistance of a diode diode, because it has a resistance much Under 100 ohms it. Negative temperature coefficient ( NTC ) thermistors can easily be calculated will use a multimeter of... Ohms than 10 ohms analog meter is quite straightforward can do > 500G and in this,... Changes according to the temperature it is very rare for them to go low tips the. The connection between the resistor and LED various electronics topics such as is. Turn on the two ends like in the above image resistance of a particular.. A complete multimeter guide it ’ s try some resistances that are low enough that the can... Find out if it has a resistance much Under 100 ohms, it is still.! Is of great importance when you want to check or replace these elements covers electronics... To 9.9 ohms than 10 ohms leads ( a.k.a test probes ) and of! This particular case was used to control the output of electrical devices ( e.g of your multimeter on and its... A type of variable ( adjustable ) resistor 0.7V ) transistor by multimeter ( DMM + AMM How!: negative temperature coefficient ( NTC ) thermistors ( for continuity test of your multimeter ), beeps. A loop must equal zero '' if it has a resistance much Under 100 ohms, it.. Surface Mount Resistors: How you can use a multimeter, the of. Meter is quite straightforward very important to choose the right function and the LED let ’ s time get...

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