On Tue, 7 Apr 2009 00:09:07 -0700 (PDT),
wrote:

On Apr 6, 7:15 am, JP wrote:
Put this on Ebay. Real clean unit. It works although I didn't have it
long enough to figure out how to use the coil tester stuff. I bought a
package deal and am separating it up to try and help cover the LC102 I
just bought. If you want to send it in for calibration, Goggle Sioux
Falls on AGA. A tech there just gave out the addy for a company where
this was made that does repairs and calibration a week or so ago.
It is double bubbled and then packed in a larger sturdy box full of
peanuts. Your choice of shipping. Pics show measuring a 100uf
electrolytic cap and set up to do reforming (can take and hour). I
used it to reform that same 100uf cap in just a few minutes. Watch for
an ESR meter, manuals, field calibration unit for the LC53, and other
stuff this week...Thanks for reading Ebay #260388540185

This is not the tool for reforming lytics. A bench HV supply with a
limiting resistor or a homemade transformer rectifier and light bulb
current limiter (and the resistor) work MUCH better. The Z Meter is
good for finding bad large value LV lytics and RF coils in switcher
supplies, but NOT HV lytics, HV mica or oil caps or big iron core
inductors. Like most Sencore pieces it is fairly cheaply built and
optimized for TV/VCR guys.
According to the manual it reforms caps.That's my best answer.So where
is the drawing ro schematic of what you are talking about since I am
selling this one?

JP wrote:
According to the manual it reforms caps.That's my best answer.So where
is the drawing ro schematic of what you are talking about since I am
selling this one?

It does, but it's not a really good way to reform caps.

Here is a schematic, though you must have a fixed-width font to see it:

+-----)(--------+
| YOUR CAP |
| |
| o--------)-------+
| / \ | |
+--o/+ -\o----+ |
\ / |
\ / 1kv bridge |
o 1K ohm
| or more
| 1W or so
| 115vac .2a |
+uuuuuuuuuuuuuuuu+
==================
+mmmmmmmmmmm+-------------------/ |=
| on off ( |
+-------------------o/ o--------\_l= 117vac


The transformer output should be maybe half to 3/4 the rated voltage on the
capacitor. This is really just the front end of a power supply with an
enormously high value current limiting resistor so that the cap gets charged
up much more slowly than it normally would in a power supply application.

You can put a load shunt resistor across the cap if you want it to charge up
even more slowly and if you want to reduce the maximum voltage it charges up
to.

You can alternatively take the attitude that if a cap needs to be reformed
it should probably be replaced instead.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

On 8 Apr 2009 10:36:27 -0400, (Scott Dorsey) wrote:

JP wrote:
According to the manual it reforms caps.That's my best answer.So where
is the drawing ro schematic of what you are talking about since I am
selling this one?

It does, but it's not a really good way to reform caps.

Here is a schematic, though you must have a fixed-width font to see it:

+-----)(--------+
| YOUR CAP |
| |
| o--------)-------+
| / \ | |
+--o/+ -\o----+ |
\ / |
\ / 1kv bridge |
o 1K ohm
| or more
| 1W or so
| 115vac .2a |
+uuuuuuuuuuuuuuuu+
==================
+mmmmmmmmmmm+-------------------/ |=
| on off ( |
+-------------------o/ o--------\_l= 117vac


The transformer output should be maybe half to 3/4 the rated voltage on the
capacitor. This is really just the front end of a power supply with an
enormously high value current limiting resistor so that the cap gets charged
up much more slowly than it normally would in a power supply application.

You can put a load shunt resistor across the cap if you want it to charge up
even more slowly and if you want to reduce the maximum voltage it charges up
to.

You can alternatively take the attitude that if a cap needs to be reformed
it should probably be replaced instead.
--scott
The manual states that the Sencore uses very low amperage to reform
caps...maybe micro amps IIRC...don't see the difference except that it
adjusts with a switchinstead of hacing to swap out components and
rebuild a power supply for each value...and has a readout to show you
when the caps is "done" ...just my 2 cents...

JP wrote:

On 8 Apr 2009 10:36:27 -0400, (Scott Dorsey) wrote:

JP wrote:
According to the manual it reforms caps.That's my best answer.So where
is the drawing ro schematic of what you are talking about since I am
selling this one?

It does, but it's not a really good way to reform caps.

Here is a schematic, though you must have a fixed-width font to see it:

+-----)(--------+
| YOUR CAP |
| |
| o--------)-------+
| / \ | |
+--o/+ -\o----+ |
\ / |
\ / 1kv bridge |
o 1K ohm
| or more
| 1W or so
| 115vac .2a |
+uuuuuuuuuuuuuuuu+
==================
+mmmmmmmmmmm+-------------------/ |=
| on off ( |
+-------------------o/ o--------\_l= 117vac


The transformer output should be maybe half to 3/4 the rated voltage on the
capacitor. This is really just the front end of a power supply with an
enormously high value current limiting resistor so that the cap gets charged
up much more slowly than it normally would in a power supply application.

You can put a load shunt resistor across the cap if you want it to charge up
even more slowly and if you want to reduce the maximum voltage it charges up
to.

You can alternatively take the attitude that if a cap needs to be reformed
it should probably be replaced instead.
--scott
The manual states that the Sencore uses very low amperage to reform
caps...maybe micro amps IIRC...don't see the difference except that it
adjusts with a switchinstead of having to swap out components and
rebuild a power supply for each value...and has a readout to show you
when the caps is "done" ...just my 2 cents...


Keep digging a hole. The basic circuit shown is just one way to
reform electrolytics. A better circuit uses a Variac before the
transformer to let you set it anywhere you want it, and use a resistor
to limit the current to the desired range. A mA or uA meter in series
with the negative lead to monitor the current. its been done that way
from the first days of manufacturing electrolytics.


BTW, have you ever USED the Sencore LCR bridge for actual work? I
have. I have also used HP. The only 'feature' the Sencore meter had
was the ability to measure ESR. You can buy a kit to do the same thing
for about $60, or 'roll your own' for $5.


--
And another motherboard bites the dust!

On Fri, 10 Apr 2009 09:20:36 -0400, "Michael A. Terrell"
wrote:


JP wrote:

On 8 Apr 2009 10:36:27 -0400, (Scott Dorsey) wrote:

JP wrote:
According to the manual it reforms caps.That's my best answer.So where
is the drawing ro schematic of what you are talking about since I am
selling this one?

It does, but it's not a really good way to reform caps.

Here is a schematic, though you must have a fixed-width font to see it:

+-----)(--------+
| YOUR CAP |
| |
| o--------)-------+
| / \ | |
+--o/+ -\o----+ |
\ / |
\ / 1kv bridge |
o 1K ohm
| or more
| 1W or so
| 115vac .2a |
+uuuuuuuuuuuuuuuu+
==================
+mmmmmmmmmmm+-------------------/ |=
| on off ( |
+-------------------o/ o--------\_l= 117vac


The transformer output should be maybe half to 3/4 the rated voltage on the
capacitor. This is really just the front end of a power supply with an
enormously high value current limiting resistor so that the cap gets charged
up much more slowly than it normally would in a power supply application.

You can put a load shunt resistor across the cap if you want it to charge up
even more slowly and if you want to reduce the maximum voltage it charges up
to.

You can alternatively take the attitude that if a cap needs to be reformed
it should probably be replaced instead.
--scott
The manual states that the Sencore uses very low amperage to reform
caps...maybe micro amps IIRC...don't see the difference except that it
adjusts with a switchinstead of having to swap out components and
rebuild a power supply for each value...and has a readout to show you
when the caps is "done" ...just my 2 cents...


Keep digging a hole. The basic circuit shown is just one way to
reform electrolytics. A better circuit uses a Variac before the
transformer to let you set it anywhere you want it, and use a resistor
to limit the current to the desired range. A mA or uA meter in series
with the negative lead to monitor the current. its been done that way
from the first days of manufacturing electrolytics.


BTW, have you ever USED the Sencore LCR bridge for actual work? I
have. I have also used HP. The only 'feature' the Sencore meter had
was the ability to measure ESR. You can buy a kit to do the same thing
for about $60, or 'roll your own' for $5.
Oh thank you for your infinate knowledge there dumb ass...Caps are
used in two different circuits and are tested different for DC than
AC...and I am well aware that manufacturers use a bridge...so ****ing
what? You have never had something to say to me other than mean
mouthed bull****. So go back to the glory hole cafe and get lost
asshole!