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Beware of aluminum electrolytics being sold on the internet. Many of them
have sat on a shelf for more than 30 years and they have developed
corrosion inside which renders them worthless. You can't even remove the
impediment with a high voltage and current limiting.

On Fri, Jul 23, 2021, 17:00 Bob Albert via groups.io <bob91343=
[email protected]> wrote:

Roy, ESR is a sort of object for those trying to flount something
special. Measuring it is usually a waste of time. If a capacitor's ESR
has a high value, that is generally made obvious by a high D when measured
properly on a bridge. If you need capacitance, you probably don't want a
high D, whether that is from ESR or leakage.
For several years a popular DIY project was to build an ESR tester. I
don't think they are worth much. For some reason, most people prefer the
short cut of measuring a capacitor with a DMM that has a capacitance
function, and those that use them generally have no idea how that device
performs the measurement. A proper bridge is the way to test capacitors.
Bob
On Friday, July 23, 2021, 12:59:54 PM PDT, Roy Thistle <
roy.thistle@...> wrote:

On Thu, Jul 22, 2021 at 05:00 PM, Ronan wrote:

my topic is not spam

Hi Ronan:
No worries:
Anything, and everything, I post (unless it's in quotes) is all and only
just my opinion. (The moderators are the arbiters, not me.)
Thus, it's just and only my opinion that the posts about ESR Meters, on
TekScopes, are spam.
To explain... ESR is a parasitic parameter that appears in the component
model(s) for a particular realisation of capacitor(s).
ESR has its own parameter(s)... like frequency.
As such, I think the way ESR is popularly interpreted is baloney.

--
Roy Thistle