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From: robb on 21 Dec 2007 18:44

"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote
in message news:9DXaj.6331$Tt5.455(a)newsfe07.lga...
> robb wrote:
>
> > so i googled for some ESR meter plans and settled on this one
> >
> > http://ludens.cl/Electron/esr/esr.html
> >
> My opinion, It does not come close to actually giving you a
true
> ESR reading.
> All the design is doing is relying on high valued capacitors
assumed
> to still have life and hoping to display the effective series
resistance
> in them by assuming the Xc to be at a very low value with the
50khz
> referenced used.
> In practice, that isn't a real ESR meter.
>

so this luden's ESR gives no useful info about a cap ? and its
a waste of time design ?

Thanks for advice Jamie,
robb


From: robb on 21 Dec 2007 18:50

"Chuck Olson" <chuckolson01(a)REMOVETHIScomcast.net> wrote in
message news:s4udnWu68ORH3vHanZ2dnUVZ_tSknZ2d(a)comcast.com...
>
> "robb" <some(a)where.on.net> wrote in message
> news:13moba473pnjobb(a)corp.supernews.com...
> > after diagnosing an old microcontroler board with lots of
various
> > old caps i thought maybe an ESR meter to be a good tool for
the
> > tool box ? yes/no or a better tool for the box
> >
> > so i googled for some ESR meter plans and settled on this one
> > ....
> >
> > http://ludens.cl/Electron/esr/esr.html
> >
> > could someone comment on this design and whether it appears
to be
> > good/bad ?
> > are there better plans to build ? are there any improvement
mods
> > that should could be made ?
> >
> > thanks for any help,
> > robb
> >
> >
> I built this one http://www.flippers.com/esrktmtr.html - -
really good - -
> have enjoyed using it for about 4 months, now. Check out my
comment on the
> flippers website about 3/4 of the way down the page.
> Chuck Olson W6PKP
>

Thanks for reply chuck,
That looks alot like those Bob Barker ESR meters

Thanks for help,
robb


From: Jamie on 21 Dec 2007 20:09
robb wrote:

> "Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote
> in message news:9DXaj.6331$Tt5.455(a)newsfe07.lga...
>
>>robb wrote:
>>
>>
>>>so i googled for some ESR meter plans and settled on this one
>>>
>>> http://ludens.cl/Electron/esr/esr.html
>>>
>>
>>My opinion, It does not come close to actually giving you a
>
> true
>
>>ESR reading.
>> All the design is doing is relying on high valued capacitors
>
> assumed
>
>>to still have life and hoping to display the effective series
>
> resistance
>
>>in them by assuming the Xc to be at a very low value with the
>
> 50khz
>
>>referenced used.
>> In practice, that isn't a real ESR meter.
>>
>
>
> so this luden's ESR gives no useful info about a cap ? and its
> a waste of time design ?
>
> Thanks for advice Jamie,
> robb
>
>
from what I can see, it's not fully implemented to give you an
accurate reading. If you were to have a failed cap due to loss
of capacitance, it will give you the conclusion that it has a
high ESR but that isn't true how ever.
A circuit like that could work much better if it was modified.
the idea of pumping in a square wave of 50khz into that xformer
most likely generates +/- pulses if the induction is low enough.

My self, I would of used a bridge type sensing circuit from the
source and from the cap test point with a low (R) between the source
and test cap to measure the offset on the transition period.
With this type of config, the cap would be in as a shunt and not as
a series component.
all one would need to do is cross the leads for 0 calibration before
test begins.

If you don't know enough to mod this unit, maybe you should look for a
simple LCR meter with that function on it.?

I haven't really seen to much on the net for a stand alone ESR meter.
I think most just get a unit that does LCR/ESR.
something like the below link. THat's a bench model how ever, they make
a hand held also.

http://rocky.digikey.com/WebLib/B%20&%20K%20Precision/Web%20Photo/889.jpg

--
"I'd rather have a bottle in front of me than a frontal lobotomy"

"Daily Thought:

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING BUT
THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS.
http://webpages.charter.net/jamie_5"

From: robb on 21 Dec 2007 20:37

"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote
in message news:IqZaj.75$dY1.43(a)newsfe02.lga...
> robb wrote:
>
> > "Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net>
wrote
> > in message news:9DXaj.6331$Tt5.455(a)newsfe07.lga...
> >>robb wrote:
> >>>so i googled for some ESR meter plans and settled on this
one
> >>>
> >>> http://ludens.cl/Electron/esr/esr.html
> >>>
> >>
> >> My opinion, It does not come close to actually
> >> giving you a true ESR reading.
> > >
[ trimmed ] ...
> Jamie says .....
> My self, I would of used a bridge type sensing circuit from
the
> source and from the cap test point with a low (R) between the
source
> and test cap to measure the offset on the transition period.
> With this type of config, the cap would be in as a shunt and
not as
> a series component.
> all one would need to do is cross the leads for 0
calibration before
> test begins.
>

Hi jamie speaking of using a bridge circuit how does this design
look ?

http://www.qsl.net/iz7ath/web/02_brew/15_lab/06_esr/

If it is not obvious i am looking for cheap (free) ESR
schematic/plans to build
thanks for the help ,
robb


From: Jamie on 21 Dec 2007 21:36
robb wrote:

> "Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote
> in message news:IqZaj.75$dY1.43(a)newsfe02.lga...
>
>>robb wrote:
>>
>>
>>>"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net>
>
> wrote
>
>>>in message news:9DXaj.6331$Tt5.455(a)newsfe07.lga...
>>>
>>>>robb wrote:
>>>>
>>>>>so i googled for some ESR meter plans and settled on this
>
> one
>
>>>>>http://ludens.cl/Electron/esr/esr.html
>>>>>
>>>>
>>>>My opinion, It does not come close to actually
>>>>giving you a true ESR reading.
>>>>
>
> [ trimmed ] ...
>
>>Jamie says .....
>> My self, I would of used a bridge type sensing circuit from
>
> the
>
>> source and from the cap test point with a low (R) between the
>
> source
>
>> and test cap to measure the offset on the transition period.
>> With this type of config, the cap would be in as a shunt and
>
> not as
>
>> a series component.
>> all one would need to do is cross the leads for 0
>
> calibration before
>
>>test begins.
>>
>
>
> Hi jamie speaking of using a bridge circuit how does this design
> look ?
>
> http://www.qsl.net/iz7ath/web/02_brew/15_lab/06_esr/
>
> If it is not obvious i am looking for cheap (free) ESR
> schematic/plans to build
> thanks for the help ,
> robb
>
>
now you're cooking with GAS! :)

yes, That one will do just fine!


--
"I'd rather have a bottle in front of me than a frontal lobotomy"

"Daily Thought:

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING BUT
THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS.
http://webpages.charter.net/jamie_5"

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