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 Post subject: In Line Capacitor Tester
PostPosted: Nov Fri 22, 2019 7:22 pm 
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Joined: Jan Mon 12, 2015 1:39 am
Posts: 40
Location: Spokane Wa
Does anyone know where I can buy an inline capacitor tester?


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 Post subject: Re: In Line Capacitor Tester
PostPosted: Nov Fri 22, 2019 7:59 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 7234
Location: Sunbury, Ohio 43074
"inline" .... you mean "in circuit" ? They are available all over the internet. Just google "in circuit capacitor tester". I got, literally, 8 million hits according to the search engine. You can spend $35 or $300 and everywhere in between.

Be aware that by testing caps in circuit, you cannot test them at their rated operating voltages, and can occasionally get false readings due to other circuit elements, but they are "mostly" OK.

What type of equipment are you testing ?

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https://www.bbtvtestequipment.com


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 Post subject: Re: In Line Capacitor Tester
PostPosted: Nov Fri 22, 2019 10:24 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 26139
Location: Detroit, MI USA
You can't test old wax and paper caps in circuit because there are too many shunt paths that will not give you an accurate leakage test, which is what you need. The voltage on all those testers is far too low for caps rated at 200-400-600 volts.

It's a total waste of time to check those caps anyway, since if you did check them properly with a cap tester at full rated voltage and out of the circuit they would all be bad.

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Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: In Line Capacitor Tester
PostPosted: Nov Fri 22, 2019 11:21 pm 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 28399
Location: Annapolis, MD
Attempting to test components in-circuit is mostly a waste of time.

Testing capacitors (by any method) can also be a waste of time.

There many exceptions, few of which are obvious--at least to a beginner. For example, "Olde Tyme" carbon resistors all tend to drift high. Check them in circuit. If too high, then bad. Otherwise, disconnect one end and retest.

Accurate testing of capacitors is a pain in the neck. If they are one the "known to be bad" list, then just replace them. Otherwise, they have to be removed for a meaningful test.

Don't try to test everything---rather, look for patterns and trends:
--if 20 or 30% of the resistors are bad, just replace them all
--if just a few of the mica caps are bad, replace them all

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-Mark
"Even if you don't understand Ohm's Law, you are still required to obey it."


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