Author Topic: Capacitor testing  (Read 241 times)

Offline abstruse1

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Capacitor testing
« on: August 05, 2021, 05:02:21 AM »
Greetings.  I'm working (playing, actually) with flyback drivers and have some that no longer work.  I can test the individual components, and, for capacitors, I've been using a dedicated cap meter that displays capacitance.  Is this an adequate way to confirm that a cap is okay, or do I need something else, e.g. an ESR tester?

Thanx!
Abstruse1
   Been working with electicity for 60 years and still getting
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Offline MRMILSTAR

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Re: Capacitor testing
« Reply #1 on: August 05, 2021, 05:42:57 AM »
Its not an absolute guarantee but its probably good enough. The biggest problem is that the capacitor must be taken out of circuit to test.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline johnf

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Re: Capacitor testing
« Reply #2 on: August 05, 2021, 09:33:01 AM »
I have found that ceramic caps in multipliers measure somewhere near correct at test equipment levels but at elevated voltages they are breaking over internally destroying their ability to be a capacitance

Offline abstruse1

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Re: Capacitor testing
« Reply #3 on: August 06, 2021, 10:52:36 PM »
Are there better kinds of caps than ceramic?
Abstruse1
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      shocked!

Offline johnf

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Re: Capacitor testing
« Reply #4 on: August 07, 2021, 10:13:18 AM »
Better than ceramic!!

depends
silver mica tend to be more robust with high peak currents and are  the lowest loss ( hence their use in professional Induction heater tuned circuits)
Polystyrene have extremely low loss

Large polyester have a price advantage over mica and polystyrene

all depends on how you are mistreating them. If they are getting hot (losses) then ceramic and Mica are the only choices

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Re: Capacitor testing
« Reply #4 on: August 07, 2021, 10:13:18 AM »

 


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