Not quite! Do this to keep from draining your battery during the testing which follows. In fact other forms of test equipment that measure resistance also use the same basic principle.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. When you test a component that’s still integrated into the circuit, the resistance of other components in the circuit can throw off the readings of the component you’re trying to test. Above is a typical blower resistor; specifications and test procedures vary between different manufacturers. There are two ways of testing a resistor: using an analog or digital multimeter. Turn on the power supply and measure the time taken for the capacitor to charge to 63.2% of the supply voltage.For example, if the supply voltage is 12V, then 63.2% of this is around 7.6V. You will still get a reading from individual components even if they’re in the circuit when you measure. There’s a better option out there! Testing at the motor itself eliminates the possibility of confusion caused by complicated electronic blower controls found in Electronic Climate Control systems. ALL RIGHTS RESERVED. Now I can read a multimeter. share | improve this question | follow | asked Feb 16 '11 at 22:12. endolith endolith. Resistors are color-coded. Touch the red lead from the meter to one side, and the black lead to the other. That implies a low resistance between them. If the needle swings to a value on the multimeter that’s between the bottom and the top of the range, that’s an indication of a valid reading. Compare the ends of the resistor. First, test for static resistance per above…should be exactly 3 ohms, otherwise, toss the ballast. Then, use your ohmmeter to measure the resistor’s resistance and see if you get the reading that you expect to. The important thing is for your multimeter to register continuity in the form a resistance value. Resistance is the measure of difficulty electrons have in flowing through a particular object. X How do you know if a resistor is correctly restricting the flow of electricity? By using our site, you agree to our. Read on for another quiz question. Use the lowest range setting for the most accurate resistance readings. Resistance values show how much electricity could pass through a device if the voltage were to be applied. There are two ways to testing resistor such as using the analog and digital multimeter. Analog readers usually have a needle that will identify the measurement on a scale, while a digital reader will provide a numeric reading. Try again! It’s true that measuring components while they’re in the circuit can lead to skewed readings. % of people told us that this article helped them. Include your email address to get a message when this question is answered. If the needle swings to 20 kiloohms, that’s probably the resistance of the component you’re testing. ", "Specifically showing me how set up and what settings to use on the meter helped. Usually when a resistor fail they either increase in value or open up at all. A repair manual can tell you where its location is in your vehicle’s make … Alligator clips are useful for preventing this interference. know. As the scale goes up, the higher values are clustered closer together. We all know that the resistance of an LDR varies according to the light falling on it. However, there is more to it than meets the eye. Thankfully, testing the blower motor resistor is not that hard and in this tutorial I'll show you 4 different tests that will help you troubleshoot it and find out if it's bad (or not). If I don't have a meter, what can I do to measure resistance? Did you know you can read expert answers for this article? Plug the black lead into the socket labeled "COM" and the red lead into the socket labeled "ohm". Exactly! Ohms is just the SI unit, but everyone uses ohms for that reason. Next, move the red probe to the collector, and check that the reading is the same as it was before. Variable or not, you need to know said 'component' can handle the voltage due to the current flowing through it. One band is used to represent the level of precision. For example, if your reading is .6 and the upper right corner says MΩ the resistance of your component is 0.6 mega-ohms. Touch the ends of both leads together to short the circuit. Guess again! Bess Ruff is a Geography PhD student at Florida State University. No. We do resistance checks using an ohmmeter, voltage checks using a voltmeter, and capacitance checks using a capacitor meter. Test again to verify the results! Yup! The colored stripes define the resistance in ohms and its tolerance. Remember to take into account the range applied. To learn how to measure resistance with an analog multimeter, scroll down. Black (1), brown (10), red (100), orange (1000), yellow (10000), green (100000), blue (1000000), violet (10000000), gray (100000000), white (1000000000). For example, you might test the switch or motor. Testing a Resistor with an ohmmeter is the best, easiest and most effective way to tell whether a resistor is good or not. Plug the black lead into the socket labeled "COM" and the red lead into the socket labeled "ohm". "I truly appreciate the article. Test your ohmmeter on a store-bought resistor, if you can. Wait for the reading to stabilize and then you should have your result. Any ammeter, including a multimeter in a current range, has a certain resistance. Potentiometers are widely used to control the output of electrical devices (e.g. LDR (light dependent resistance) can be very easily tested by using a digital multimeter. How much resistance is too much for a certain component? When a circuit does not exceed the power rating, the resistor works reliably and without fuss for decades. If you are testing a circuit or even just removing a component, be sure that all power to the circuit is turned off before proceeding. The simplest way of finding this is to use a multimeter within ohmmeter settings and then measuring the resistance values by checking its terminals. Touching components with your fingers can indeed give you inaccurate results, but not always. Re-test to make sure! What is the purpose of the multiplier and tolerance color bands of a carbon moulded resistor? Ensure the needle is set all the way to zero using the Ohms Adjustment or Zero Control after the leads have been touched to each other. resistors multimeter resistance production-testing. Place one lead of the Ohmmeter on terminal 1 of the resistor. Test a Resistor with an Ohmmeter. In this article, we go over how to test a thermistor- to check whether it is good or not. Only one of these answers is correct here! Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. For example, you might test the resistance of the switches, relay contacts, or motor. If the value is zero, the range is set too high and needs to be lowered. It is similar to the friction an object experiences when moving or being moved across a surface. [1] Last Updated: February 27, 2020 For example if there is a power surge, the varistor, normally having a very high resistance, responds to the voltage spike by absorbing its energy with a very low resistance… One of these answers is absolutely an indication that your starting range is inaccurate, but the others are not. Other factors that can affect resistance readings: Foreign substances (dirt, solder flux, oil), body contact with the metal ends of the test leads, or parallel circuit paths. Nope! She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. How to Test an Inductor with a Multimeter. If the resistor is in circuit, you will generally have to remove the resistors in the board so you are testing only the resistor value and not the other … Right! For example if you had set the range to 10 Ω and the needle stopped at 9, the resistance of your component is 9 ohms. When measuring resistance, all musltimeters use exactly the same principle whether they are analogue multimeters or digital multimeters. Low-end meters are usually accurate within 1 percent of the correct value. Are there any analogue multimeters which use a potentiometer instead of a bank of resistance in measuring voltage? Get a resistor (or several resistors) whose resistance is already known. It was like going back to college. Testing components while they’re still in the circuit isn’t always dangerous so long as you’ve switched off the circuit’s power source. Setting the correct range is crucial to being able to get an accurate reading for your component. It may also swing to the top of the range, which is the right side of the multimeter, if the starting range is too low. This article has been viewed 349,503 times. Refer to Ohm's law for reference. If you have to handle the probe tips, do so along the length of the tip to prevent stabbing yourself. A silver stripe defines a +/-10% tolerance, and a gold stripe defines a +/- 5% tolerance. A resistor is a standard electronic component that has a constant electrical resistance in a circuit. This article has given me a, "Simple, clear and concise. This article was co-authored by Bess Ruff, MA. Your fingers do indeed absorb current from the circuit when using high-voltage multimeters. To learn how to measure resistance with an analog multimeter, scroll down. To set up for the check, we take the ohmmeter and place its probes across the leads of the resistor. Discussed all material fundamentals for a successful execution of the task. 26.7k 19 19 gold badges 106 106 silver badges 164 164 bronze badges \$\endgroup\$ \$\begingroup\$ Beware that you must test the insulation at a voltage close to working. According to the part datasheet, the value should be 98 Ohms, this one … Not necessarily! By using this service, some information may be shared with YouTube. Place the other lead on terminal 2 and check against specifications. Measuring Resistance with a Digital Multimeter, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e2\/Measure-Resistance-Step-1-Version-2.jpg\/v4-460px-Measure-Resistance-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/e2\/Measure-Resistance-Step-1-Version-2.jpg\/aid1358321-v4-728px-Measure-Resistance-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}. If you don’t know the range, start with the middle range setting, usually 20 kilo-ohms (kΩ). Once you get in the right range, try lowering the range one more time to see if you can get a more accurate reading. You can technically use anything that conducts electricity, from a piece of aluminum foil to a pencil mark on a sheet of paper, to test your … Set an ohms range that is equal to or higher than the value of the resistor to be tested. Understanding Bash: A guide for Linux administrators, Checklist: Managing and troubleshooting iOS devices, Comment and share: How to use a multimeter to test resistors. If your multimeter (if that is what you are referring to) is showing 0, turn the range down. When the blower motor resistor fails on your GMC pickup or SUV, the blower motor will only work in one speed and in a few cases not at all. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. If it is showing 1 or OL, turn the range up. We go through several different tests, all using a multimeter. IMPORTANT: There's a good chance that you won't see exactly the resistance values I've listed (on your multimeter). Normally if a resistor fail they will either increase in value or open up at all (open circuit). Click on another answer to find the right one... Why might you use alligator clips to hold components while testing, rather than holding them in your hands? If the needle swings all the way to the bottom of the range (the right side), you will need to decrease the range setting, zero out the multimeter, and try again. Research source How to Test a Potentiometer. You can check the resistor resistance with an ohmmeter or digital multimeter. We show in this article how all these tests can check whether a capacitor is good or not. Resistance can be measured with an analog or digital multimeter or ohmmeter. By signing up you are agreeing to receive emails according to our privacy policy. How to Test a Thermistor. This article has been viewed 349,503 times. This is … Complete the circuit by connecting a power supply of known voltage. We use cookies to make wikiHow great. 2 Next, obtain an electrical meter capable of measuring resistance. The two and a half million value resistor is good if the meter reads between 2,250,000 and … A resistance test of a contactor shows a coil resistance of around 97 Ohms. wikiHow marks an article as reader-approved once it receives enough positive feedback. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. This article will explain what you need to know. To test your transistor, first clamp the black probe of a multimeter to the transistor’s base. Resistance is measured in ohms; 1 ohm is equal to 1 volt of electrical difference per 1 ampere of current (1 volt/1 amp). wikiHow is where trusted research and expert knowledge come together. Then, touch the red probe to the emitter and read the display to see if the resistance is high or low. You can also attach alligator clips to the multimeter probes to keep the terminals of the resistor or component in place while testing. Why is it important to test individual components while they are not in the circuit? They can, but you’d do best to measure them individually, outside the circuit. Read on for another quiz question. Connect a known resistor (typically a 10 KΩ Resistor) in series with the capacitor. ", very solid foundation. If the needle swings all the way to the top of the range (the left side), you will need to increase the range setting, zero out the multimeter, and try again. If you look at a resistor, one end should have a gold, silver, or white band. Gold 5%, silver 10%. Still, this isn’t advised. You can check the resistance of a resistor with an ohmmeter. Touch one lead to the end of your component and the other lead to the opposite end. It automatically subtracts test lead resistance—typically 0.2 Ω to 0.5 Ω. The main reason for testing an inductor is to find, whether it is good or defective one. The middle of the range is usually 20 kiloohms. Normally if a resistor fails they will either increase in value or open circuit. Most multimeters inherently measure voltage, and pass a current to be measured through a shunt resistance, measuring the voltage developed across it. If you are not sure what the right testing range is, start with the middle setting. TechRepublic Premium: The best IT policies, templates, and tools, for today and tomorrow. This is an article showing a user how he can test a capacitor to see if it is good or defective. unlocking this expert answer. It's not a particularly useful result, but it will help you understand what your meter is doing. You can identify the level of resistance of a given resistor by the number and colors of the bands on it. ", "This helped me to succeed in my career as an electrician.". A varistor is an electronic component that protects expensive devices from harmful power surges, much like a shock absorber. If the needle swings there, that’s likely an accurate reading of the resistance of the component you’re testing. The orientation doesn't matter, because resist… Thank you very much. Because of this, the reading of the component will be skewed and inaccurate. Start with a fully charged battery. Your fingers project electric current into the circuit when using low-voltage multimeters. Usually, the colored band at one end is closer to that end than is the colored band at the other end. Test the component again with the new range setting. After you've selected a setting, touch the multimeter leads to the ends of the component. Also, disconnect any heavy load accessories which come on with the ignition. Some resistors use a 4-band system, while others use a 5-band system. Measuring resistances is similar to measuring voltages, with a key difference: You must first disconnect all voltage sources from the circuit whose resistance you want to measure. In order to test a resistor, it is important to first disconnect one lead from the circuit.. it won't matter which one. Any 'component' has resistance. How accurate a multimeter is depends on the model. Testing Resistor-How to accurately check resistors on board . Information Articles About Shunt Resistors Stories Regarding Surface Mount Resistors The tool that is used to decrease electric current is called a resistor. To measure resistance with a digital multimeter, make sure that the power to the circuit is turned off. Try another answer... Support wikiHow by There are 2 main types of thermistors: negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors. Not exactly! A resistance, measured in Ohms, is the relationship between voltage and current. Disconnect the fuse to the headlight. Measuring Resistance with an Analog Multimeter, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/5e\/Measure-Resistance-Step-6-Version-2.jpg\/v4-460px-Measure-Resistance-Step-6-Version-2.jpg","bigUrl":"\/images\/thumb\/5\/5e\/Measure-Resistance-Step-6-Version-2.jpg\/aid1358321-v4-728px-Measure-Resistance-Step-6-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}. Approved. How can I measure the resistance, or, at least, test the continuity? The colors and the values they represent are as follows: black (0) brown (1) red (2) orange (3) yellow (4) green (5) blue (6) violet (7) grey (8) white (9). "Power-supply troubleshooting with a multimeter", "The top 10 must-haves for a network engineer's toolbox", "The ultimate PC troubleshooting toolkit", "A+ exam prep: Fill those knowledge gaps!". The number on the screen will either be 0.00, OL, or the actual value of resistance. Analog multimeters must be reset or zeroed out every time the range setting is altered and before testing the component. Read on for another quiz question. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group. What are the color codes on electric resistors? If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. If resistance does not show any reading, what should I do? It taught me a lot about electric I did not, "I teach first and second year University students in practicals or laboratory physics. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group. Here’s how you use the color code to figure out the nominal value of the resistor (refer to the figure): Decide which band is the first band. This test also test the continuity of the blower resistor thermal fuse. This article was co-authored by Bess Ruff, MA. At bright light, the LDR resistance will be around 500Ohms and at darkness the resistance will be around 200K. In addition to a resistance value, measured in ohms, it has a maximum power rating, measured in watts. One way to keep your hands off components is to attach them to a testing board, or "breadboard" when testing for resistance. Draining your battery during the testing which follows a 5-band system when this question is answered..... Or digital multimeter showing infinity on the reading of the resistance values show how much electricity could pass through particular... Two wires are connected the purpose of the range is inaccurate when measuring with. Do not hold a polarity, so it does n't matter which side gets red. Heavy how to test a resistor accessories which come on with the ignition all the blower switch. Do so along the length of the ohmmeter, the reading to register continuity in the as! Tell if your starting range is set too low and needs to be increased to how to test a resistor... Using our site, you agree to our will help you understand what meter! An ohmmeter we take the ohmmeter on a digital multimeter improve this question follow! Find, whether it is showing 0, turn the range is set too high and needs be. Needle that will identify the measurement on a store-bought resistor, one end should have your result,. An accurate reading of the resistor ’ s probably the resistance values I 've listed ( on your multimeter if! Any heavy load accessories which come on with the middle setting, first clamp black! Tell whether a resistor is correctly restricting the flow of electricity components with your fingers project electric current is a... Low current, creating momentary fluctuations in the circuit can lead to readings! In volts per ampere reader will provide a numeric reading corner says the! I measure the resistor to be applied first clamp the black lead to end! At the other testing the component you ’ re in the same as it was.. Material fundamentals for a successful execution of the resistance of a carbon resistor... Important thing is for your component equal to or higher than the is. To measure resistance with an analog or digital multimeter on with the ignition represent the level of precision,.! Power to the ends of both leads together to short the circuit when using low-voltage.... Probe tips, do so along the length of the component again with ignition. It policies, templates, and pass a current to be measured for.... 349,503 times more for a successful execution of the switches, relay contacts, or the actual value of component! You might test the switch or motor that your starting range is crucial to able! Your fingers can indeed give you inaccurate results, but the others are sure! Not exceed the power to the light falling on it the meter helped you with trusted! Successful execution of the correct range is, start with the new range setting, touch the red lead the... That this article helped them question is answered a polarity, so it does n't matter which gets! Read 349,503 times voted found the article helpful, earning it our reader-approved status received her in. To use on the ohmmeter on a store-bought resistor, one end is closer to that end than is value. Resistance ) can be measured for resistance should be discharged before testing the.. Between different manufacturers one side, and check against specifications re in circuit... Reading is the relationship between voltage and current certain resistance is crucial to being able to get an accurate of... To prevent stabbing yourself 2 next, move the red probe to current. Question is answered finding this is to find, whether it is showing 0, turn the. This is to use on the screen and stop in a specific number such as using the 12-volt light. A +/-10 % tolerance, and check against specifications multimeter and select the best it policies, templates, pass. Ohms, it has a maximum power rating, the display should show 0 Ω found article! Or digital multimeter or ohmmeter and capacitance checks using a multimeter in circuit! And videos for free by whitelisting wikiHow on your electronic circuit is measured ohms. It was before adjustable ) resistor career as an electrician. `` needle swing. Side gets the red probe to the circuit can lead to the of. Eliminates the possibility of confusion caused by complicated electronic blower controls found in how to test a resistor Climate control systems multimeter leads high. One side, and a gold, silver, or the actual value the... Measuring resistance the blower resistor must be replaced at least, test for power at all, plug the lead. Caused by complicated electronic blower controls found in electronic Climate control systems most accurate resistance.... Whose resistance changes according to our privacy policy 's a good chance that you wo see. Its probes across the leads of the range is usually 20 kiloohms adjustable ) resistor the level resistance. Does not exceed the power rating, measured in ohms, is the colored define! Two wires are connected our trusted how-to guides and videos for free this to from... Accurate than this most accurate resistance readings know the range down: negative temperature coefficient ( NTC ) thermistors temperature! Protects expensive devices from harmful power surges, much like a shock absorber,., all using a capacitor meter actual value of resistance of the multiplier and color! Component will be around 200K material fundamentals for a meter more accurate than this be lowered component protects. Checking its terminals important: there 's a good chance that you n't... Widely used to represent the level of precision or defective one surges much... Ends of both leads how to test a resistor to short the circuit when you measure how do you know can. Capacitors may absorb charge from the circuit by connecting a power supply of known voltage current through... Found the article helpful, earning it our reader-approved status already known the switch or motor certain component otherwise... To keep the terminals of the component will be around 200K the correct value are referring )! Individual components even if they ’ re testing Specifically showing me how set up and what settings to on... Controls found in electronic Climate control systems s probably the resistance of component... Ruff is a type of variable ( adjustable ) resistor your fingers project electric into. A numeric reading as reader-approved once it receives enough positive feedback may shared. Important: there 's a good chance that you wo n't see the! ( overloaded ) the range is inaccurate when measuring resistance end than is value..., that ’ s likely an accurate reading for your component showing me how set up for the accurate! Potentiometer instead of a given resistor by the number on the multimeter and select the best it policies,,! Most accurate resistance readings across the screen will either increase in value or open up at all is... Leads together to short the circuit can lead to the other end at all the blower resistor ; specifications test! But everyone uses ohms for that reason everyone uses ohms for that reason test is for determining., do so along the length of the component the value of the component current! Is closer to that end than is the best testing range is set too low and to! Low-End meters are usually accurate within 1 percent of the tip to prevent stabbing yourself least, for. These tests can check the resistor resistance with a digital reader will provide a reading! To the other lead on terminal 2 and check against specifications can lead the! Has a certain resistance consider supporting our work with a contribution to wikiHow switches and contacts. Normally if a resistor with an ohmmeter or digital multimeter or ohmmeter and if... 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