Testing Capacitor - How To Test A Capacitor When Breakdown Under Load

Testing Capacitor - How To Test A Capacitor When Breakdown Under Load-How To Study For A Test

Have you ever come over power question where once you switch on the power furnish and the fuse blow? You have checked all the components in the power (primary) and secondary section and all the components seems to be ok! Where is the fault? A fuse blown are usually caused by a shorted bridge rectifier, defective posistor, power transistor or Fet, shorted original winding of switch mode power transformer, shorted secondary diode and etc. But in this article I'm gone to show you another inexpressive of electronic troubleshooting tips.

How To Study For A Test

I got frustrated as to where is the cause of power problem. Every time when i switch on the power furnish the fuse blow immediately (the fuse became dark color and this indicate that there is a major short circuit in the power supply). I have checked all the components in the power furnish and can't find the culprit! What i do is i desoldered all the suspected parts one by one and supplanted with a known good component. I eventually found the caused of the power furnish problem. Guess what? It was the main filter capacitor (220 microfarad 400 volt). After replacing the filter cap the power furnish worked perfectly fine. I begin my detective work to find out why this capacitor can caused the fuse to blow even though i already confirmed it ok with my meters.

The meters that i used to check the filter cap were analog meter, digital capacitance meter and esr meter. In this article i will not justify about how to check capacitor or testing capacitor and how capacitor work. I believed most of you know how to check capacitors and also ordinarily using this type of meters. Measured with analog it showed capacitor charging and discharge, with digital capacitor tester it showed around 220 microfarad and with esr meter it showed low esr reading!

This proved that the bad capacitor breakdown when under full operating voltage. Then, how do i confirm that this filter capacitor is faulty? By using an analog insulation tester. When i join together the faulty cap to the meter and press the go button-it showed a very low resistance and this is the proved of short circuit in the middle of the plate when voltage applied! There is nothing to do with bad electrolyte. A good capacitor will just showed a payment and dismissal in the insulation meter just like you are checking a capacitor using analog multimeter. In the shop there is quite a estimate of ranges that you can buy. It has the range of 50v, 100v, 250v, 500v, 1000v and even 5000v! If you want to test a capacitor of 100 microfarad 160v then you have to pick 100v. If you pick 250v, it will blow your capacitor that is under test.

If you have the Sencore Test equipment such as the sencore lc meter Lc102 Or Lc103, these meters have the capabilities of checking any type of capacitors with four tests:

-testing for capacitor values

-checking for leakage

-equivalent series resistance (Esr) and

-Dielectric absorption

It can check aluminum electrolytic capacitor, film capacitor, ceramic, high voltage capacitor and etc.

Conclusion-Different capacitor constructor produced different type of capability of a capacitor. Perhaps the bad capacitor that I encountered are from the lowest grade one. A capacitor failure when under load is very rare. Using Esr capacitor meter alone can solve most of the electrolytic capacitor problem.

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