JP wrote:

How come every time I post some FA that there is always some know it
all that has some **** to say about it trying to queer the sale?.


Auction and for sale are not allowed on the sci.electronis
newsgroups. A seperate newsgroup was created at the same time for those
listings. It is: news:misc.industry.electronics.marketplace

As far as people giving you a load of crap for ugnoring the charter
for these groups? Good for them.


--
And another motherboard bites the dust!

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!

wrote:


I have 2 LC77s and they *will* reform lytics up to 1000vdc. Its just a
PITA beacause you have to use the handle to hold the little plunger
thing against the "leakage" button.

Talk about a mickeymouse arrangement! Then again we ARE talking
Sencore, not HP or Tek.


So, you think HP or Tektronix would leave a pair of clip leads
powered with up to 700 VDC available for someone to get shocked? MORON.

They won't risk the liability and Sencore doesn't, either. Sencore
is not laboratory grade equipment, it is made for repair work. That is
a market that HP and Tektronix has almost always priced themselves out
of. The Sencore equipment was designed to be carried on a service
truck, or to take as baggage on a plane to the customer's site to get
equipment back on line.


--
And another motherboard bites the dust!

On Fri, 10 Apr 2009 09:11:49 -0400, "Michael A. Terrell"
wrote:

:misc.industry.electronics.marketplace
**** you Terrell! Crawl back into your hooch and shut the **** up
private!

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!

On Fri, 10 Apr 2009 09:25:47 -0400, "Michael A. Terrell"
wrote:


wrote:


I have 2 LC77s and they *will* reform lytics up to 1000vdc. Its just a
PITA beacause you have to use the handle to hold the little plunger
thing against the "leakage" button.

Talk about a mickeymouse arrangement! Then again we ARE talking
Sencore, not HP or Tek.


So, you think HP or Tektronix would leave a pair of clip leads
powered with up to 700 VDC available for someone to get shocked? MORON.

They won't risk the liability and Sencore doesn't, either. Sencore
is not laboratory grade equipment, it is made for repair work. That is
a market that HP and Tektronix has almost always priced themselves out
of. The Sencore equipment was designed to be carried on a service
truck, or to take as baggage on a plane to the customer's site to get
equipment back on line.
Like you knwo what the **** you are talking about..**** you
Terriorist!

Michael A. Terrell wrote:

So, you think HP or Tektronix would leave a pair of clip leads
powered with up to 700 VDC available for someone to get shocked? MORON.

No, but GenRad did. I have a ZM-11/U around here somewhere and you can
get a pretty nasty shock off the bridge output if it's set to balance
charged caps. You can also blow up low voltage caps if you try and measure
them too, unfortunately....
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:

Michael A. Terrell wrote:

So, you think HP or Tektronix would leave a pair of clip leads
powered with up to 700 VDC available for someone to get shocked? MORON.

No, but GenRad did. I have a ZM-11/U around here somewhere and you can
get a pretty nasty shock off the bridge output if it's set to balance
charged caps. You can also blow up low voltage caps if you try and measure
them too, unfortunately....


How many years has General Radio been out of business? One of the
regulars on the sci.electronics.* groups was an EE there, and has told
similar stories of bad design practices.


--
And another motherboard bites the dust!