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how to test a capacitor

Views:4     Author:Site Editor     Publish Time: 2019-07-11      Origin:Site

There are many different ways to test capacitors. Here are three effective ways to test capacitors.These methods are also applicable to test running capacitors and starting capacitors


A very good test you can do is to check a CBB65 running capacitor with your multimeter set on the ohmmeter setting. 

By taking the CBB65 running capacitor's resistance, we can determine whether the CBB65 running capacitor is good or bad. 

To do this test, We take the ohmmeter and place the probes across the leads of the CBB65 running capacitor. The orientation doesn't matter, because resistance isn't polarized. 

If we read a very low resistance (near 0Ω) across the CBB65 running capacitor, we know the CBB65 running capacitor is defective. It is reading as if there is a short circuit across it. 

If we read a very high resistance across the CBB65 running capacitor (several MΩ), this is a sign that the CBB65 running capacitor likely is defective as well. It is reading as if there is an open circuit across the CBB65 running capacitor. 

A normal CBB65 running capacitor would have a resistance reading up somewhere in between these 2 extremes, say, anywhere in the tens of thousands or hundreds of thousands of ohms. But not 0Ω or several MΩ. This is a simple but effective method for finding out if a CBB65 running capacitor is defective or not. 



Test a CBB65 running capacitor with a Multimeter in the Capacitance Setting

Another check you can do is check the capacitance of the CBB65 running capacitor with a multimeter, if you have a capacitance meter on your multimeter. All you have to do is read the capacitance that is on the exterior of the CBB65 running capacitor and take the multimeter probes and place them on the leads of the CBB65 running capacitor. Polarity doesn't matter. 

This is the same as the how the setup is for the first illustration, only now the multimeter is set to the capacitance setting. 

You should read a value near the capacitance rating of the CBB65 running capacitor. Due to tolerance and the fact that (specifically, electrolytic CBB65 running capacitors) may dry up, you may read a little less in value than the capacitance of the rating. This is fine. If it is a little lower, it is still a good CBB65 running capacitor. However, if you read a significantly lower capacitance or none at all, this is a sure sign that the CBB65 running capacitor is defective and needs to be replaced. 

Checking the capacitance of a CBB65 running capacitor is a great test for determining whether a CBB65 running capacitor is good or not. 



Test a CBB65 running capacitor with a Voltmeter

Another test you can do to check if a CBB65 running capacitor is good or not is a voltage test.

After all, CBB65 running capacitors are storage devices. They store a potential difference of charges across their plate, which are voltages. The anode has a positive voltage and the cathode has a negative voltage. A test that you can do is to see if a CBB65 running capacitor is working as normal is to charge it up with a voltage and then read the voltage across the terminals. If it reads the voltage that you charged it to, then the CBB65 running capacitor is doing its job and can retain voltage across its terminals. If it is not charging up and reading voltage, this is a sign the CBB65 running capacitor is defective. 


To charge the CBB65 running capacitor with voltage, apply DC voltage to the CBB65 running capacitor leads. Now polarity is very important for polarized CBB65 running capacitors (electrolytic CBB65 running capacitors). If you are dealing with a polarized CBB65 running capacitor, then you must observe polarity and the correct lead assignments. Positive voltage goes to the anode (the longer lead) of the CBB65 running capacitor and negative or ground goes to the cathode (the shorter lead) of the CBB65 running capacitor. Apply a voltage which is less than the voltage rating of the CBB65 running capacitor for a few seconds. For example, feed a 25V CBB65 running capacitor 9 volts and let the 9 volts charge it up for a few seconds. As long as you're not using a huge, huge CBB65 running capacitor, then it will charge in a very short period of time, just a few seconds. After the charge is finished, disconnect the CBB65 running capacitor from the voltage source and read its voltage with the mustimeter. The voltage at first should read near the 9 volts (or whatever voltage) you fed it. Note that the voltage will discharge rapidly and head down to 0V because the CBB65 running capacitor is discharging its voltage through the mustimeter. However, you should read the charged voltage value at first before it rapidly declines. This is the behavior of a healthy and a good CBB65 running capacitor. If it will not retain voltage, it is defective and should be replaced. 



So there you have it, 3 strong tests that you can do (all or either/or) to test whether a CBB65 running capacitor is good or not. 


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