AC capacitor testing with multimeter


How to Test & Check a Capacitor with Digital Multimeter and Analog AVO Meter.

By five (5) Methods with pictorial Views.

In Most Electrical and Electronics troubleshooting and repairing, we face this trouble that how to test and check a capacitor? Is it Good, Bad (dead) Short or Open?
Here, we can check a capacitor with Analog (AVO Meter i.e. Ampere, Voltage, Ohm meter) as well as Digital multimeter.

Note: To find the Value of Capacitance, you need a Digital meter with Capacitance measuring features.

Below are five (5) methods to check & test that a Capacitor is Good, Bad, Open, Dead, or Short.

Also Read:

Method 1.

Traditional Method to test & check a capacitor (Not Recommended for everyone but professionals only)

Note: This method is dangerous, please be careful to do this practice. Make sure that you are a professional Electrical Engineer and there are no other option to check the capacitor because serious damages may...

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Hi Guys,

Just a short introduction as I'm a new member here:

I recently purchased a really nice set of 120W powered bookshelf speakers and each on has a miniature computer and power supply built into them (each on separate PCB).

Well, it appears one of the caps is bad on the power supply. It is bulging and I noticed what could be a small amount of electrolyte leakage. I swapped the broken power supply out with a known working power supply from the other speaker and it works.

I noticed when I pushed down on the bulging cap it made a fizzle sound.


How do I test for a bad capacitor with a simple digital multimeter?

The cap in question is a...

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Steps for measuring capacitance with a digital multimeter.

How to measure capacitance

A multimeter determines capacitance by charging a capacitor with a known current, measuring the resulting voltage, then calculating the capacitance.

Warning: A good capacitor stores an electrical charge and may remain energized after power is removed. Before touching it or taking a measurement, a) turn all power OFF, b) use your multimeter to confirm that power is OFF and c) carefully discharge the capacitor by connecting a resistor across the leads (as noted in the next paragraph). Be sure to wear appropriate personal protective equipment.

To safely discharge a capacitor: After power is removed, connect a 20,000...

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How to Test a Capacitor?

In this tutorial, we will see how to test a Capacitor and find out whether the capacitor is working properly or it is a defective one. A Capacitor is an Electronics/Electrical component that stores energy in the form of Electric Charge. Capacitors are often used in electronics circuit boards or few electrical appliances and perform a variety of functions.

When a capacitor is placed in an active circuit (a circuit with active current flowing), charge starts to build up in the capacitor (on one of its plate) and once the plate of the capacitor can no longer hold the charge, it is released back in to the circuit through the other plate.

This action is called Charging and Discharging of Capacitor. Basically, capacitors can be classified in to Electrolytic and Non – Electrolytic Capacitors.

Like all electrical and electronics components, a capacitor is also sensitive to spikes and such voltage swings can damage the capacitors...

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[Summary]How To Test A Capacitor Buy the meter in this video! Click here: Detail Instructions on How To Test a Capacitor properly with a digital capacitor meter. Help Support My Channel:


How To Test A Capacitor

Buy the meter in this video! Click here:

Detail Instructions on How To Test a Capacitor properly with a digital capacitor meter.

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5 Ways to Test a Capacitor

wikiHow to Test a Capacitor

Five Methods:Using a Digital Multimeter With Capacitance SettingUsing a Digital Multimeter Without Capacitance SettingUsing an Analog MultimeterTesting a Capacitor With a VoltmeterShorting the Capacitor TerminalCommunity...

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I have to second the idea that the cold air may be getting back to the thermostat too much and therefore making it think the whole room is cool.

Alternately, bad thermostat. This is common really.

Also, check the filter. If the filter is dirty the first thing above will happen because the cold air can not 'get out' of the unit.

1. Check filter.
2. Check for cold air recirculation.
3. Check thermostat.

If the thermostat is bad you can tell my taking it out of the unit and connecting with long wires that are not near the AC unit, for one example. That way it can not detect any cold air. I suppose you could stick insulation in there somewhere too to keep cold air from getting to...

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There are two types of capacitors used in window AC units — run capacitors and start capacitors. Some manufacturers combine both the run and start capacitors in one unit. The start capacitor provides the extra starting torque needed by the compressor to start under-load and is connected only during the start-up cycle. The run capacitor, on the other hand, remains connected at all time and serves to increase the efficiency of the compressor evaporator/condenser fan motors. Testing these capacitors is an easy process that even a beginner can do correctly and safely the first time.

Unplug the window air conditioner from its dedicated wall receptacle. Remove the unit from its window mounting and place on the floor or a sturdy table. Some of these units can be quite heavy so you may want to enlist the aid of a helper.

Remove the screws holding the sheet metal, wrap-around cover in place. Use caution when sliding the cover off. The edges of the sheet metal are very sharp...

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Puffy Capacitor Overview how to test for bad caps on TV board & Click Here to BUY TV REPAIR PARTS: What is a Capacitor - DIY Testing a Capacitor - TV Help This video is an overview about capacitors: What is a capacitor What does a capacitor do How to test a capacitor How to replace a capacitor TV symptoms of a bad capacitor: TV will not turn on immediately TV takes a long time to turn on TV turns on slowly Power Supply Capacitor replacement TV board repair kit Component level TV Repair TV will not turn on So in this video today we are going to look at what a capacitor is, how it works, what it does, how to identify a bad cap and what happens when they do go bad, how to find a replacement and how to install it. So capacitors were originally known as condensers, so if you hear some of the old timers talking about a condenser, you know what it is. Basically they are used to store a charge. They are able to get rid of that charge very quickly,...

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@Runforlife - How to Test a BAD Capacitor with a Multimeter on your Power Supply

@Daniel D. Wilcox - The Best Multimeter Tutorial in The World (How to use & Experiments)

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@ELECTRIC TECH - How to Test a Capacitor

@grayfurnaceman - Testing the start capacitor

@Dan the Fix it Man - How to test a Dual Run Capacitor from Air Conditioner with a Multimeter

@fnaguitarplayer9 - How to Check Motor Start and Motor Run Capacitors

@Tech StudyCell - How to Test Capacitors with and without using Multimeter

@ToolBoom Supermarket - Measuring capacitance without desoldering capacitors from a PCB

@Richard Lloyd - AC Fan/Compressor Not Working - How To Test /Repair Broken HVAC Run Start Capacitor Air Condition HD

@Tampatec - Easy way How to test Capacitors, Diodes, Rectifiers on Powersupply using Multimeter

@Ratchets And Wrenches - How to Use a...

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This capacitor testing guide will show you how to tell if a run capacitor requires replacement. Although the parts are relatively inexpensive, calling a repairman to diagnose and replace it would cost over $100. With this guide, you can keep that money.

A capacitor is an electrical device that stores an electrical charge. They are used on fan motors and compressors in hvac systems.

They have two electrical ratings. The first rating is the unit's capacitance which is given in microfarads (mfd). This is a measure of the amount of charge the unit can store with a specified voltage applied. The second rating is a voltage rating which tells what supply voltage the unit is rated for. This is usually 370vac or 440vac in hvac systems. This is important to know because, if a significantly higher voltage is applied, the capacitor will prematurely fail.

Types of capacitors...

There are two different types of capacitors which are used in hvac units. The...

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"It helped me know some more ways of testing electrolytic capacitors. This comes in handy when you want to

improvise, especially when all professional testing tools are not readily available. "..." more

"We had a practical test and this article has really helped me understand. It is really simple and the captions are

a great help."..." more

"The article reinforced my memory of electronics that I learned 30 years ago. Thank you very much."


James Duncan

Sep 15, 2016

"I have been a teacher of industrial electronics. This is presented very well. "

"Very easy to follow instructions, and multiple methods are presented."


Emilio Morales

Dec 9, 2016

"It was the charging and discharging of the capacitors that stood out."

"Good for beginners learning electronic components and measurements."

"The article gave me exactly the information I was looking for."

"I learned some...

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