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using ESR meter    
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pete g



Joined: 31 Oct 2009
Posts: 6
Location: ft. lauderdale, florida

PostPosted: Thu Jan 14, 2010 3:12 pm    Post subject: using ESR meter Reply with quote

hi, i recently read that checking a cap that is in parallel with a low resistance could result in giving a false good reading. is this true? if so does this apply to all esr meters? congrats on a truly informative web site. sincerely, pg.
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kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Thu Jan 14, 2010 3:53 pm    Post subject: Reply with quote

Yes, if there is a low value resistor in parallel to the capacitor, it will affect the measurement.

I find this to be somewhat rare in most circuits with capacitors. Particularly those with with electrolytic capacitors. It does happen occasionally though.

Like every tool, you still have to use your brain when your outcome just doesn't make sense.
pete g



Joined: 31 Oct 2009
Posts: 6
Location: ft. lauderdale, florida

PostPosted: Thu Jan 14, 2010 5:07 pm    Post subject: esr measurment Reply with quote

hi and thanks for your prompt reply. how low a value resistor? pg
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Thu Jan 14, 2010 5:26 pm    Post subject: Reply with quote

Measure, with your ESR meter, various resistors you have in your parts bin, with and or without various value capacitors in parallel. This should give you a very good approximation. Wink
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Fri Jan 15, 2010 9:52 am    Post subject: Reply with quote

anything less than 200 ohms would affect your measurements. the lower, the more it would effect.
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