How to Use an Ohmmeter
Aug 07, · This quick video will give you some tips on how to use an ohmmeter!Read more: elvalladolid.com our social media channels to find. Jul 22, · This video will demonstrate how to use an ohmmeter to check simple appliance parts such as switches and heating elements with both analog and digital ohmmete.
Current is generally measured in amps, and resistance in ohms. Testing the resistance on an electrical circuit in your home or car can help you diagnose problems with that circuit. Read on for instructions on how to use an ohmmeter and test for resistance. You must have a completely dead wire or circuit in order to ensure accuracy in measurement, as well as your own safety. Your ohmmeter will supply the voltage and current for your circuit so NO other power is necessary.
Connect testing wires to the ohmmeter. Consult a service manual for the how to use an ohmeter range of resistance for the circuit you are testing. See highlighted red square in image. On an individual ohmmeter, you may have to set a range for the readings, in ohms, kilohms or megohms.
Use the range you located in your service manual to set the dial. Note in this picture we're testing a set of plug wires. Connect the ohmmeter wires to the plug wires, metal to metal. It doesn't matter which wire goes to which end; the test will work either way. Check the ohmmeter reading and see if it falls in the range listed in your service manual.
Plug wires have a set resistance. Note in this picture we're testing a light switch. Place the wires on the connectors that normally link the switch to the house wires. Know what is a 2 1 2 dollar gold piece worth a reading of OL means "over limit.
If you got an OL reading for the plug wires, you'd know there was a broken wire that needs replacing. Consider that a low reading, anywhere from 0 to. This means there's a continuity of current in the circuit.
This is the reading you should get when the light switch is in the "ON" position. Test any circuit with your ohmmeter. Remember that "over limit OL " means there's too much resistance and a break in the wire somewhere. A near-zero reading indicates no resistance and smooth-flowing current.
In circuits like plug wires where a set range of resistance is necessary for them to work properly, any reading other than the proper range indicates bad wires that need to be replaced. Valerie David has been a professional writer for over a decade, composing articles for TVOvermind. She has also been published in fiction, with short romantic stories and a manga comic script. David holds a Bachelor of Arts in English, with extensive background as a research librarian.
Home Hardware. Step 2 Connect testing wires to the ohmmeter. Step 3 Consult a service manual for the normal range of resistance for the circuit you are testing. Step 5 Note in this picture we're testing a set of plug wires.
How to make a funny video for facebook 6 Check the ohmmeter reading and see if it falls in the range listed in your service manual. Step 7 Note in this picture we're testing a light switch. Step 8 Know that a reading of OL means "over limit. Step 9 Consider that a low reading, anywhere from 0 to. Connection to a power source can cause harm to the ohmmeter, the circuit and YOU.
Types of Ohmmeter
To use an ohmmeter, start by disconnecting all power to the circuit that you're testing. Next, turn the dial in the center of your ohmmeter to change the scale of the reading from tens, to hundreds, to thousands, and so on. Use the lowest scale available on the meter that is higher than the resistance of what you’re measuring. Then, touch the 2 probes to opposite ends of the circuit and read the number on the ohmmeter to find the circuit’s resistance. Holding one lead of the resistor and one test lead of the ohmmeter between the thumb and index finger of the left hand, and the other resistor lead and meter test lead between the thumb and index finger of the right hand (to keep each test lead of the meter in firm contact with the respective leads of the resistor), the technician obtains a resistance measurement of M?. Aug 26, · Some basic tips to remember when using an ohmmeter. This is a handy tool but many people use it the wrong way.
To create this article, volunteer authors worked to edit and improve it over time. This article has been viewed 9, times. Learn more Capacitors are small electronic components that store a certain electric charge. Their applications are truly numerous and there are many different types. The charge that the capacitors store is only released when the device they power needs it. Being able to test a capacitor is really important in order to know whether it has shorted or determine the resistance between its plates for example.
The easiest way to test a capacitor is to use an ohmmeter. There are also combination capacitors or dual capacitors which are used to operate two different devices. Here is how to easily check a capacitor with an ohmmeter.
Download Article Explore this Article Steps. Related Articles. Author Info Last Updated: November 7, Disconnect the power source of the capacitor. You should also make sure that the device which the capacitor powers is unplugged before your continue. If the appliance is instead hard wired, simply turn the circuit breaker off. Use masking tape to label the wires that connect to your capacitor. In some cases you will see terminal labels that have been printed on the housing or lid of the capacitor.
Pull off the terminal connectors of the wire away from the wire terminals of the capacitor. You can use needle-nose pliers to make this easier. Use the pliers to terminal connector off the terminal. Take a screwdriver that has an insulated handle and put it across the terminals of the capacitor.
Make sure the metal of the screwdriver is touching the two terminals — this will discharge your capacitor. Then use the screwdriver to independently touch the other terminals. Take your analogue ohmmeter and turn it to the highest setting. Take its two leads and touch them together in order to zero the meter. Take the black negative lead of your ohmmeter and put it on a terminal of the capacitor.
In case your capacitor is polarized, then you have to put the black lead on its negative terminal. Take the other lead positive of your ohmmeter and put it on the remaining terminal of the capacitor. Take a look at the reading of the ohmmeter. If the needle goes to infinite, then retreats a little bit and moves back to infinite again, then the capacitor has passed the test. Include your email address to get a message when this question is answered. Submit a Tip All tip submissions are carefully reviewed before being published.
Related wikiHows How to. How to. Co-authors: 5. Updated: November 7, Categories: Measuring Power Current and Energy. Thanks to all authors for creating a page that has been read 9, times.