VISUAL INSPECT
Most defective capacitors especially electrolytic type can be easily detected through visual check. The typical defects include the following:
♦ Bulged appearance
♦ Split vents
♦ Fluid leaking
Image on the left are examples.
USING CAPACITANCE/ESR METER
We have Peak atlas model on the left and on the right is the B&K Precision 889B that can help the job in checking capacitors more easy and accurate.
OPEN the links below for capacitor ESR table reference.
ESR Capacitor Table (vectron)
ESR Capacitor Table (rmccurdy)
ESR Capacitor Table (eevblog)
ELECTRICAL TESTING FOR CAPACITOR
A simple circuit shown below can be used to check capacitors output wave-forms. Used a diode 1N400x series. Adjust the desired AC inputs, I used 5V AC on my experiment.
Below are the sample of good and bad capacitor wave-forms using the above circuit.
OPEN links below for different types of capacitors.
Types of Capacitor 1
Types of Capacitor 2
Types of Capacitor 3
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