On Thu, 19 Jun 2014 17:19:00 +0000 (UTC), Cydrome Leader <presence@MUNGEpanix.com> wrote:
Maynard A. Philbrook Jr. <jamie_ka1lpa@charter.net> wrote:---
In article <b243q9t7gq15ragisjeqisjkn30iib91do@4ax.com>,If you take an electronic device, even something simple like a battery
jfields@austininstruments.com says...
The resistance of a capacitor is an entirely different thing, andCould you please clarify that a bit? I am only an
amounts to the leakage current measured through the dielectric with
a voltage across it.
In terms of goodness, the lower the ESR and the higher the
resistance the better.
John Fields
inbred from Maine and I did quite get that one.
there are still losses inside the device from the wiring, connections and
other electrochemical stuff going on inside the device.
Those internal losses are what's called ESR. For instance, if you short
out a AAA battery you will get less current than if you short out a D
cell, even though both can in theory output 1.5V. The D cell has beefier
internal construction and offers a lower internal resistance, so more
current can be drawn from it.
The tricky part is a battery, (or capacitor or anything really) is not a
plain resistor, so you can't measure this "equivalent" value with an ohm
meter, but if you could, the result would be the ESR.
In capacitors, you generally want the lowest possible ESR. A cap with a
high ESR is old, failing, cheap or just junk, and it can potentially heat
up during use, just like a resistor. Heat makes electrolytic capacitors
dry up, which increased the ESR, which make them heat up more, until they
explore or just stop being capacitors.
Right.
They turn into explorers. ;)
John Fields
https://www.designworldonline.com/basics-of-tantalum-electrolytic-capacitors/I think this may help you understand, and why, each must be measured differently.
On 6/19/2014 2:18 PM, John Fields wrote:
On Thu, 19 Jun 2014 17:19:00 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:
Maynard A. Philbrook Jr. <jamie_ka1lpa@charter.net> wrote:---
In article <b243q9t7gq15ragisjeqisjkn30iib91do@4ax.com>,If you take an electronic device, even something simple like a battery
jfields@austininstruments.com says...
The resistance of a capacitor is an entirely different thing, andCould you please clarify that a bit? I am only an
amounts to the leakage current measured through the dielectric with
a voltage across it.
In terms of goodness, the lower the ESR and the higher the
resistance the better.
John Fields
inbred from Maine and I did quite get that one.
there are still losses inside the device from the wiring,
connections and
other electrochemical stuff going on inside the device.
Those internal losses are what's called ESR. For instance, if you short
out a AAA battery you will get less current than if you short out a D
cell, even though both can in theory output 1.5V. The D cell has
beefier
internal construction and offers a lower internal resistance, so more
current can be drawn from it.
The tricky part is a battery, (or capacitor or anything really) is
not a
plain resistor, so you can't measure this "equivalent" value with an
ohm
meter, but if you could, the result would be the ESR.
In capacitors, you generally want the lowest possible ESR. A cap with a
high ESR is old, failing, cheap or just junk, and it can potentially
heat
up during use, just like a resistor. Heat makes electrolytic capacitors
dry up, which increased the ESR, which make them heat up more, until
they
explore or just stop being capacitors.
Right.
They turn into explorers. ;)
John Fields
The third picture (schematic) has a slightly simplified schematic of
a capacitor with it's ESR, leakage and inductance.
https://www.designworldonline.com/basics-of-tantalum-electrolytic-capacitors/I think this may help you understand, and why, each must be measured differently.
Mikek
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