Test A Capacitor Using Continuity Test. Inspect the motor capacitor. Once the motor is up to speed, the start capacitor disconnects and is not used again until the next time the motor starts. At first, you have to make sure that you know what you’re doing. Also, most motors have a start capacitor, which is only used to START the motor. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. The purpose of the start capacitor is to help the compressor get going. The first is to remove the capacitor from the circuit. By conducting a simple test with a multimeter, you can easily tell if your capacitor is still working or if it needs to be replaced. How to test an electric motor capacitor: this article gives a description of electric motor capacitor test procedures to determine if a capcitor is damaged or working normally & test procedures to measure the capactor's capacitance or microfarads, MFD, or uF to determine if it is working within its rated capacitance range. Use a screwdriver to open your machine and locate the capacitor. You can use a DMM for this purpose. To check a capacitor with an ohm meter, you must do two things. A capacitor is a device that stores an electrical charge. Visually inspect your start capacitor for a small protuberance. By signing up you are agreeing to receive emails according to our privacy policy. While each capacitor serves a different purpose, each is testable in the same manner. Disconnect the capacitor from the power supply, or at least make sure one lead is disconnected. It's usually easy to remove a start or run capacitor – you simply unhook it from its harness and disconnect the wires. Then, use a screwdriver to open the appliance so you can locate the capacitor, which is a metal tube that should be near the motor. ; Discharge it using a resistor. Take a pair of pliers and press them on the leads of the capacitor before you begin the test. Find the start capacitor, which is the larger of the two capacitors, and remove the metal cover. V How to Test the Motor Start Capacitor without a Multimeter. Make sure you are an electrician / electrical engineer, or carefully read out the warnings before applying these methods of testing a capacitor. To learn how to use a multimeter to check the capacitor, scroll down! If there is no change, it means that the capacitor is dead. Or get another one from the manufacturer of your appliance. Connect the Meter leads to the Capacitor terminals. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d4\/Check-a-Start-Capacitor-Step-1-Version-7.jpg\/v4-460px-Check-a-Start-Capacitor-Step-1-Version-7.jpg","bigUrl":"\/images\/thumb\/d\/d4\/Check-a-Start-Capacitor-Step-1-Version-7.jpg\/aid40933-v4-728px-Check-a-Start-Capacitor-Step-1-Version-7.jpg","smallWidth":460,"smallHeight":259,"bigWidth":"728","bigHeight":"410","licensing":"

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\n<\/p><\/div>"}. This is very useful and this is why you can find a capacitor in almost every circuit board. A start capacitor is only used in the motor circuit for a second or two when it first starts to turn. It's usually easy to remove a start or run capacitor – you simply unhook it from its harness and disconnect the wires. Spy Pen Instructions, How To Use One and When To Use On... Spy Technology Updates 2019 – New Tech and Future. For this test, switch to capacitance mode. Make sure the suspected capacitor is fully discharged. Now here polarity is important. Most multimeters don't have this function, though, but you can still test a capacitor using the voltmeter or ohm meter setting. The meter should start at zero and then moving slowly toward infinity. Capacitors can store a lot of energy and the resulting spark or current can result in serious injury. If the reading is far too little, that means the capacitor is dead. I'm now satisfied that I received what I paid for. If the capacitance number went up infinitely to the limit of your multimeter, the capacitor has shorted out and should be replaced. Mini Camera Instructions – How to Use Guide. He currently dedicates his time to security and in his spare time helps write and manage the Gadgets Spy blog. Treat every capacitor as if it had voltage. The basic purpose of a capacitor is to provide an initial surge of electrical charge to start a motor. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. Capacitance is measured in microfarads. I just needed to be sure that a capacitor is faulty before I go ahead and replace it. How do i check a start capacitor if my A/C is starting on the heat setting and shutting off after a few minutes? The continuity test method for a capacitor shows whether it is opened, short or good.. Use caution when working with electricity. This will discharge the capacitor and enable you to get a more accurate reading. Click here to view a capacitor start motor circuit diagram for starting a single phase motor. It will need to be shorted out by placing an insulated screwdriver across the leads of the capacitor. ", the help; now I know how to check a capacitor! 1. Thanks to all authors for creating a page that has been read 794,668 times.

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