CAUTION CAPCITOR Nerd Food
http://www.ebay.com/itm/Portable-Digital-Capacitor-ESR-Tester-Internal-Resistance-Meter-Test-In-Circuit-/322034893012?hash=item4afac680d4:g:oNQAAOSwoudW4WGt#rwid
Forum Discussion
I must plead some degree of ignorance to many of the finer points of ESR variation, nominal values, and its effect on different circuits. Take this with a grain or two of salt.
I wouldn't tend to suspect that input filter capacitors would be especially sensitive to small ESR changes. (The filter capacitors are among the more common ones to have trouble, partly because they often operate at higher temperatures.) Bad capacitors often have an ESR reading that is several times nominal, so checking and troubleshooting doesn't require the utmost of precision and detailed checking of specifications from data sheets.
As to a relation of expected ESR vs. capacitor specification, I think I saw that once in a data sheet, at least for that specific class of capacitor. What the general relation was I don't remember.
I wouldn't tend to suspect that input filter capacitors would be especially sensitive to small ESR changes. (The filter capacitors are among the more common ones to have trouble, partly because they often operate at higher temperatures.) Bad capacitors often have an ESR reading that is several times nominal, so checking and troubleshooting doesn't require the utmost of precision and detailed checking of specifications from data sheets.
As to a relation of expected ESR vs. capacitor specification, I think I saw that once in a data sheet, at least for that specific class of capacitor. What the general relation was I don't remember.
