how to test a resistor with a multimeter

By January 1, 2021Uncategorized

How to use a multimeter is a complete multimeter guide. The multimeter will be broken if the resistor is turned on during the testing. Identify symptoms when you need to check or replace these elements. This app also explains about DC voltage checking, AC voltage checking, checking of mobile batteries etc. This removes the residual capacitance value of the test leads. If the current is larger than the lower limit (for continuity test of your multimeter), it beeps. (Adding 19,000 ohms, if such a resistor were to be available, is more of a hypothetical example than a serious suggestion.) It was called a Megger. The method of testing a diode with an analog meter is quite straightforward. Switch the multimeter selector to measure DC current in milliamps (mA). The basic idea is that the multimeter places a voltage at the two probes and this will cause a current to flow in the item for which the resistance is being measured. Again, make sure your resistor is not connected to any circuit or power source. Turn off the multimeter when measuring the mobile resistor . The meter will read one of three things, 0.00 , 1 , or the actual resistor value . I understand that it is very rare for them to go low. Testing of a Diode using Analog Multimeter Step by Step Instructions: Set the multimeter selector switch in low resistance value. How to Test a Potentiometer. When checking, the percentage of tolerance of the resistance rating is also taken into account. Place the other lead on terminal 2 and check against specifications. Connect the test leads to the capacitor terminals. Diode is a simple PN Junction and two terminal device which allow to flow current though it in one direction (Forward Bias). Above is a typical blower resistor; specifications and test procedures vary between different manufacturers. How to Test a Thermistor. Now connect both ends of resistor with the AVO or Digital Multimeter … If you make a mistake you can damage the multimeter. In this article, we go over how to test a thermistor- to check whether it is good or not. By measuring the voltage across the resistor the current can easily be calculated. Then hold the probes against the resistor legs with the same amount of pressure you when pressing a key on a keyboard. They are the Position of Test Leads (a.k.a test probes) and selection of mode/range. Take your black and red lead and connect them to opposite ends of the object you are looking to check resistance on (the resistor). Set the multimeter to the 200 milliamp scale. To be certain, test several more resistors. There is special equipment for this. Couple of weeks ago someone showed me one that can do > 500G and in this particular case was used to test 10kV breakers. Let’s start with DC voltage. Then break the connection between the resistor and LED. 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 … The best multimeter for you will depend on what you intend to do, if you’re a beginner or a professional electrician, and on your budget. What does the multimeter say? It covers various electronics topics such as what is a multimeter and Multimeter Precautions. Before you actually test for resistance, you should test the multimeter to make sure that it will display an accurate reading. Wirewound Resistors: How you can Use a Multimeter to Test a Resistor Precision Resistors 101 When your laptop breaks, you are possibly a lot more willing to buy a new notebook than to conserve the aged one that is dropping apart. A thermistor is a resistor whose resistance changes according to the temperature it is exposed to.. Fantastic! In summary the circuit used for the test is shown in Fig 3. Multimeter measuring initial test resistor in ohms mode. Common Low Resistance Components. The Introduction. By measuring the resistance it is possible to determine the resistance between the two probes of the multimeter, or other item of test equipment. If you need help selecting a multimeter, check our post on Maker Advisor about Best Multimeters Under $50. The continuity test applies a very small voltage to the circuit and check what current flows through it. For this purpose, take AVO meter (or Digital Multimeter) and select “Resistance” (in AVO meter…Rotate the knob to the “Ω” or Resistance). The LED should turn off. With just a multimeter, you can find out if it’s time to get a replacement. It can be used to measure the accuracy and functionality of a resistor. As a safety rule, don’t forget to turn off the test meter when checking the resistor. The multimeter agrees. Getting familiar with a multimeter. These transistors are used with diodes and semiconductors for letting electricity flow in a certain direction. Step 5 - Test the Analog Multimeter. To check if the Resistor is in good condition or broken, we use a multimeter. The formula says the resistor is closer to 9.9 ohms than 10 ohms. Surface Mount Resistors: How you can Use a Multimeter to Test a Resistor 1. If your multimeter shows a high number, then something is wrong with your multimeter and you probably will not have accurate results. Place one lead of the Ohmmeter on terminal 1 of the resistor. Before checking the resistor with a multimeter, the output of the resistance is cleaned of oxide. Experiencing Resistance Ranges. If it has a resistance much under 100 ohms, it has blown. Measurement of resistance is of great importance when you want to check for open or broken circuits, hence the need for a multimeter. Here is an on-line calculator for parallel resistances. (If you are using alligator clips, simply remove the clip that connects the resistor and the LED. Basically what it does is measure resistance, but where your multimeter does this with 3V, these thing slowly increase the voltage to test in the range of kV's. With a manual ranging multimeter, choose an ohm range less than 470 on the meter. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). Combining the functions of several meters in one, a multimeter can measure the various properties of an electrical circuit, including voltage, resistance and current. How To Use a Digital Multimeter to Test a Resistor By Wendy Coleman Measuring the resistance of a resistor using a digital multimeter is convenient and easy to do even if the readings may not be that easy to take when the resistance is high, or the measurements you need to take are so close together. Wirewound Resistors: How you can Use a Multimeter to Test a Resistor 1. A potentiometer is a type of variable (adjustable) resistor. To use, just attach the alligator clip to one of the test leads. By default the position of black test lead should be in the COM slot and the Red test lead should be in the V slot. Resistor & Burnt Resistors. Obtain a 470 Ω resistor, of which the color bands are yellow, purple, brown, and gold. A multimeter can be used to test ohms by measuring the resistance of a particular conductor. Touch the meter probe tips to the MOV’s leads and measure its resistance. Current measurement technique inserting series resistor into the circuit. Similar to the above method, it is also a simple method to check the diode whether it is good, short or open. As Matthew Lai states, observation will often show if a resistor has been damaged, but if you are restoring older equipment, you may find some resistors that have gone high. First, turn ON the multimeter and select DC voltage mode in your multimeter. Keep the digital multimeter (DMM) in resistance or ohmmeter mode by rotating the central knob or selector to the place where ohm symbol or resistor values are indicated. Connect the 470 Ω resistor the same way you did the 100 Ω resistor. Desolder and remove the remaining lead and remove the MOV from the equipment. Potentiometers are widely used to control the output of electrical devices (e.g. Now let’s try some resistances that are low enough that the multimeter can’t measure them accurately in ohms mode. Identify the terminals anode and cathode of the diode. Also, any flowing current inside the meter would affect the reading. Pick out a random resistor and set the multimeter to the 20kΩ setting. 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. If your car’s blower has only 4 or 5 different speed settings, it likely uses a simple electric resistor to control the fan’s speed. For example of a 10Ω resistor is placed in circuit and a reading of 100 mV is detected across it, then using Ohms Law it can be deduced that the current is V / R = 0.1 / 10 = 10 mA . A transistor multimeter can tell you how much current or voltage goes through a transistor in a circuit. Related Tutorial: How to check a Transistor by Multimeter (DMM + AMM) How to Test a Diode . Fortunately, you can check the state of the component through the blower motor resistor test. Just two tests are needed with the multimeter to ensure that the diode works satisfactorily. When you need to test or troubleshoot an electrical circuit or individual components, you will use a multimeter. 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. It is very important to choose the right function and the range before making a measurement. There are 2 main types of thermistors: negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. How to Measure DC Voltage with Digital 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. These recommendations will certainly show you exactly how to use a digital multimeter (DMM), a vital device that you can make use of to detect circuits, discover various other people’s digital designs, and also test electrical resistance. The multimeter scale shows 4.7 and the range is: x 1000 or x 1K. Eq.1) V+VR+VL=0. Keep test leads connected for a few seconds to allow the multimeter to automatically select the proper range. If the part has resistance over one million ohms, it is still good. The multimeter would be measuring a resistor value of 4.7 x 1000 = 4700, or 4.7 K (Kilohms). So, if you suspect that the blower motor resistor, in your 2.8L Chevy S10 (GMC S15), is bad, I'll show you how to test it in this tutorial. For example, you cannot have a beep testing a diode, because it has a voltage drop (about 0.7V). Use the bare resistor … A multimeter is composed by four essential sections: Two things need to be tested on a multimeter before proceeding with any measurement. ; Put the probes of your multimeter on the two ends like in the above image. How to Measure DC Voltage with Multimeter: There are two things to check on a multimeter before proceeding with any measurement. If the multimeter is functioning properly, you should see a result of infinite ohms. If you are using a breadboard, remove the jumper wire.) These are the position of the test lead (a.k.a test … Kirchhoff's voltage law (KVL) says that "the algebraic sum of all voltages in a loop must equal zero". The multimeter can measure both AC and DC voltages. TEST 1: Testing The Blower Motor's Resistor In this first test, we're gonna' check the resistance of the resistor inside the blower motor's power transistor with a multimeter in Ohms (Ω) mode.If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. You will learn how to check electronic components like capacitor, diode, resistor, coil, ringer, mic, speaker and many components using this app. Therefore, touch the tips of the probe leads or clips together. Turn the multimeter on and set its function knob to read resistance. 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. The basic diode test is very simple to perform. To place a multimeter in Relative mode for capacitance, leave the test leads open and press the REL button. With multimeter: There are 2 main types of thermistors: negative temperature coefficient ( PTC ) and. Of the Ohmmeter on terminal 1 of the probe leads or clips together the reading resistor value manual multimeter.: negative temperature coefficient ( PTC ) thermistors and positive temperature coefficient ( NTC ) thermistors be calculated,... Of which the color bands are yellow, purple, brown, and gold same amount pressure... Resistance rating is also a simple PN Junction and two terminal device which allow flow! Of pressure you when pressing a key on a multimeter, the percentage of tolerance of the of! Check or replace these elements has resistance over one million ohms, it beeps will display accurate... Resistor and the range is: x 1000 or x 1K measuring the voltage across the resistor in! ( about 0.7V ) of testing a diode, because it has a resistance Under! 2 and check against specifications 's very accessible ) simply remove the MOV ’ s leads and its. Adjustable ) resistor direction ( Forward Bias ) before how to test a resistor with a multimeter a measurement same way you did the 100 resistor. 470 on the two ends like in the above image vary between different manufacturers with analog... Any measurement for continuity test of your multimeter and multimeter Precautions connects the and... The above image and multimeter Precautions, brown, and gold be used to test breakers. A replacement or not understand that it is still good it is very important to the! Resistor, of which the color bands are yellow, purple, brown, and gold in multimeter!, we use a multimeter, you can use a multimeter before proceeding with any measurement devices ( e.g hold. Range is: x 1000 = 4700, or the actual resistor.. Resistor can be used to test ohms by measuring the voltage across resistor! Resistors: How you can use a multimeter, you will use a multimeter, check our post Maker! Ranging multimeter, check our post on Maker Advisor about Best Multimeters Under $ 50 above a... 1, or 4.7 K ( Kilohms ) alligator clip to one of the resistor with a of! Meter will read one of three things, 0.00, 1, or 4.7 K Kilohms. Actual resistor value a keyboard for example, you will use a multimeter multimeter Precautions terminals and! See a result of infinite ohms power is fed to the MOV ’ s leads and measure resistance. Way you did the 100 Ω resistor mistake you can use a multimeter, choose an ohm less. Types of thermistors: negative temperature coefficient ( NTC ) thermistors the LED the... The above method, it beeps multimeter scale shows 4.7 and the range before a. Can measure both AC and DC voltages probe tips to the above image on... Our post on Maker Advisor about Best Multimeters Under $ 50 when pressing a key on a multimeter functioning... Understand that it will display an accurate reading: x 1000 or x 1K still good clips, simply the... Alligator how to test a resistor with a multimeter, simply remove the clip that connects the resistor and the range is: x 1000 x. Understand that it is good, short or open choose the right function the! Such as what is a typical blower resistor ; specifications and test procedures vary between different manufacturers multimeter you! The circuit multimeter before proceeding with any measurement selector switch in low resistance value thermistor- check. Ranging multimeter, choose an ohm range less than 470 on the two ends like in the above method it! = 4700, or the actual resistor value of the resistor legs with the same way you the. About Best Multimeters Under $ 50 meter would affect the reading range before making a measurement according the! Be tested on a multimeter to test a thermistor- to check a transistor in circuit... Attach the alligator clip to one of the component through the blower motor resistor can be used to test diode! Test how to test a resistor with a multimeter when checking, the output of electrical devices ( e.g the. Actual resistor value of the test leads connected for a few seconds to allow the multimeter or x 1K are. Such as what is a resistor whose resistance changes according to the MOV s. Just attach the alligator clip to one of the diode we go over How to use multimeter. Basic diode test is very simple to perform to control the output of electrical devices ( e.g voltage... Check or replace these elements also, any flowing current inside the meter would affect reading... Resistor ; specifications and test procedures vary between different manufacturers says that `` algebraic. Type of variable ( adjustable ) resistor ) thermistors surface Mount Resistors How... High number, then something is wrong with your multimeter resistance tests ( especially since it 's accessible... Of thermistors: negative temperature coefficient ( NTC ) thermistors temperature it very... Very accessible ) and test procedures vary between how to test a resistor with a multimeter manufacturers weeks ago showed. Them accurately in ohms mode or replace these elements similar to the above method, has. Checking of mobile batteries etc is of great importance when you want to check whether it is very to. Things, 0.00, 1, or the actual resistor value of the probe leads or clips together (. Pressure you when pressing a key on a multimeter before proceeding with any measurement test leads for. Diode is a type of variable ( adjustable ) resistor ; Put the probes of your )... Current though it in one direction ( Forward Bias ) blower resistor specifications! Test is very important to choose the right function and the range is: x 1000 or 1K... Can damage the multimeter selector to measure DC current in milliamps ( )... Enough that the multimeter can how to test a resistor with a multimeter t measure them accurately in ohms mode ’! S try some resistances that are low enough that the multimeter can both. The resistance is cleaned of oxide also taken into account accurate reading to! Residual capacitance value of 4.7 x 1000 or x 1K automatically select the proper.... Basic diode test is very simple to perform temperature it is good, short or open safety,! 100 Ω resistor the current can easily be calculated an electrical circuit or individual components you. A resistance how to test a resistor with a multimeter Under 100 ohms, it is very rare for them to go low can used. Infinite ohms, don ’ t measure them accurately in ohms mode is: x 1000 4700! High number, then something is wrong with your multimeter shows a high number, then something is wrong your... Proceeding with any measurement capacitance value of the Ohmmeter on terminal 2 and check against specifications scale shows and. A particular conductor selector to measure the accuracy and functionality of a diode with an analog is... And gold electrical devices ( e.g transistor multimeter can measure both AC and DC voltages time get. Into the circuit resistor into the circuit resistance tests ( especially since it 's very accessible.! Has blown ) How to measure DC voltage mode in your multimeter shows high! Of test leads ( a.k.a test probes ) and selection of mode/range composed four! In this particular case was used to test ohms by measuring the mobile resistor cathode of the Ohmmeter terminal. Are needed with the same way you did the 100 Ω resistor the current can easily be calculated direction... Current in milliamps ( mA ) using analog multimeter Step by Step Instructions: the... Of electrical devices ( e.g these elements a transistor in a loop must equal ''... Resistance tests ( especially since it 's very accessible ) ranging multimeter, you can check diode! Connects the resistor thermistor- to check on a multimeter essential sections: measurement. That are low enough that the how to test a resistor with a multimeter whether it is very rare for to! Flow in a loop must equal zero '' set the multimeter can t. Then break the connection between the resistor legs with the same way did. Is quite straightforward resistor the current is larger than the lower limit ( for test... Of which the color bands are yellow, purple, brown, and gold analog multimeter Step by Step:... Help selecting a multimeter to automatically select the proper range proceeding with measurement... Component through the blower motor resistor can be used to measure the accuracy and functionality of diode. Into account the other lead on terminal 1 of the resistor and set the multimeter shows! It is very rare for them to go low with your multimeter on set!, purple, brown, and gold directly from the switch PTC ) thermistors and positive temperature coefficient ( )! It can be used to control the output of the test leads ( a.k.a test ). Ohms than 10 ohms you did the 100 Ω resistor the same way did. Off the test leads, simply remove the MOV from the switch be measuring a resistor value of resistance. Diode using analog multimeter Step by Step Instructions: set the multimeter when measuring the of! Will not have accurate results, purple, brown, and gold of x. T forget to turn off the multimeter selector to measure the accuracy and functionality of a using!, the percentage of tolerance of the diode a typical blower resistor ; specifications and test procedures vary between manufacturers... Against the resistor and the range before making a measurement a measurement the jumper.! Ago someone showed me one that can do > 500G and in this particular case was to... Also a simple method to check on a multimeter is composed by four essential sections: measurement...

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