Sorry to perpetuate the OT discussion, but there is an excellent series of
articles by capacitor design engineer Cyril Bateman called Understanding
Capacitors, published in EWWW magazine in the late '90s. The article on
electrolytics covers almost anything you might want to know about them,
Hi Chad:
Google found it:
http://techdoc.kvindesland.no/radio/passivecomp/20061223155312558.pdf
But it's not that informative.
The best info I've seen on measuring components is the HP (Agilent)
Impedance Handbook.
http://cp.literature.agilent.com/litweb/pdf/5950-3000.pdf
I measured dozens
Sencor LC 102.
-John
==
[snip]
Does anyone know of a modern cap leakage tester?
Have Fun,
Brooke Clarke
http://www.PRC68.com
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To: Discussion of precise time and frequency measurement
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Sent: Friday, June 24, 2011 7:22 PM
Subject: Re: [time-nuts] Replacing electrolytics - any disadvantages of high
temp ones?
Hi Chad:
Google found it:
http://techdoc.kvindesland.no/radio/passivecomp
Hi John:
It's almost $1k and does much more than measure leakage. Is there a
much lower cost instrument that's aimed at just leakage?
Have Fun,
Brooke Clarke
http://www.PRC68.com
J. Forster wrote:
Sencor LC 102
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Hi again John:
The manual for the LC 102 is free from BAMA and it's got all kinds of
useful info.
http://bama.edebris.com/manuals/sencore/lc102/
Have Fun,
Brooke Clarke
http://www.PRC68.com
Brooke Clarke wrote:
Hi John:
It's almost $1k and does much more than measure leakage. Is there a
Hi Brook,
I know it's a pricey box, but I got mine cheap ($100) at an MIT Flea Market.
If I wanted a cheapo leakage tester, I'd build one with a simple, variable
voltage inverter, maybe a Cockroft-Walton stage or so, and a couple of $20
DMMs.
-John
=
Hi John:
It's almost $1k
Yes, except the schematics suck. Dave H at ArtekMedia helped mo out with
that.
You could also get the manual from Sencor directly for something like $20
- $50, I forget exactly.
The LC 102 has been replaced with the LC 103, last seen.
-John
=
Hi again John:
The manual for
All,
Speaking of replacing electrolytic capacitors, which I am now doing on a
Fluke 845A, I found a carbon comp resistor way out of spec. It is a 150
ohm, 1/4 watt current limiter, for a 10 Vdc zener. I noticed that it had
looked to have been hot (or gave off excessive heat), and had made a shiny
Sencore 102 or 103's. If your lucky you can find one for less $200.
If you don't mind the age. At the bottom of the pile are ones like the
Eico 950-B and many that are close. The 950-B is about the best
in the lower shelf. Stick with the B, newer if anything and remember
Eico's also came as a
On Fri, 24 Jun 2011 11:11:34 -0700, GMail / AnalogAficionado
analogaficion...@gmail.com wrote:
Sorry to perpetuate the OT discussion, but there is an excellent series of
articles by capacitor design engineer Cyril Bateman called Understanding
Capacitors, published in EWWW magazine in the late
copies of EWW
somewhere.
Alan
G3NYK
- Original Message -
From: Brooke Clarke bro...@pacific.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, June 24, 2011 7:22 PM
Subject: Re: [time-nuts] Replacing electrolytics - any disadvantages
If I recall, didn't BK make a capacitor analyzer that did ESR measurements
too? I think it was a hybrid, part solid-state, and part tube, but folks
swore by them.
Best,
Will
*** REPLY SEPARATOR ***
On 6/24/2011 at 2:34 PM Pete Lancashire wrote:
Sencore 102 or 103's. If your
Hi:
Be careful, the web URL is Pro Audio Design Forum. There are other cap
articles by the same author where he's measuring the distortion at 1 kHz
down to -140 dB.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Matt Osborn wrote:
On Fri, 24 Jun 2011 11:11:34 -0700, GMail /
On 06/21/11 08:39 PM, Poul-Henning Kamp wrote:
In message4e008a73.50...@erols.com, Chuck Harris writes:
and yet, I find that some electrolytic
capacitors that have been run at lower than normal voltage improve markedly
when reformed by applying rated voltage through a 10K resistor for a
Oh to add further information.
I love old caps. They go bad and I get my test equipment for cheap.
That said I do measure the caps I am going to put in on a old style HP cap
meter that can apply up to 100 volts to the cap. I look for leakage. What I
see in quite modern caps that have been around
IMO, the issue of reforming is very much alive with electrolytics, old and
new.
In some modern PZT actuator drivers, there is a warning to bring up the
supplies slowly if the unit has been dormant for sx months or more.
-John
Oh to add further information.
I love old caps.
A very good reference for aluminum electrolytic use:
http://www.cde.com/catalogs/AEappGUIDE.pdf
Guides for other capacitor types are also on this page:
http://www.cde.com/appguide/
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Had not seen these links and at least so far the CDE sights quite good
Thanks
On Wed, Jun 22, 2011 at 12:35 PM, Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
A very good reference for aluminum electrolytic use:
http://www.cde.com/catalogs/AEappGUIDE.pdf
Guides for other capacitor types
On 06/21/11 12:59 AM, Alan Melia wrote:
David Another important factor when considering power supply caps is ripple
current rating. It is generally the ripple current that makes them get warm.
Yes. I must admit I did not give that any thought, which was rather stupid of
me. But I did not buy
Dr. David Kirkby wrote:
I think the usual thumbnail calculation still work for caps if you can
reduce the temperature by 20 degrees they will last at least 4 times as
long. That is an activation energy (Arrhenius eqn) of about 1ev. I also
believe though I cant quote that they are best run at
In message 4e008a73.50...@erols.com, Chuck Harris writes:
and yet, I find that some electrolytic
capacitors that have been run at lower than normal voltage improve markedly
when reformed by applying rated voltage through a 10K resistor for a
couple of hours.
I noticed in a datasheet at one
Group,
During my days of interest in antique radios, I learned that
the dielectric between aluminum plates was formed by passing
current in one direction to build up an oxide coating on the
plates, which became the dielectric. The thickness is directly
proportional to working voltage and
Hi Bill,
I agree with your forming information, as applied to older caps,
but not your temperature information. The 105C high temp caps
are just as happy, or unhappy really, with low temperatures as
the 85C caps. Basically the difference between the two is water.
The 85C caps have an
I'm sure many of you with old equipment must have considered the fact that
electrolytic caps have a finite life and considered replacing them. I have a few
that look suspect (bulging) on a transceiver, and decided to replace them. I'm
tempted to do all of them in the PSU, as:
* It runs hot
*
In message 4dffbaf4.4070...@onetel.net, Dr. David Kirkby writes:
1) Higher temperature devices (like 105 deg C) will be more relieable than low
temperature ones like the standard 85 deg C cap. I'm sure at high
temperatures,
You should check both temperature and lifetime rating of the
On 06/20/11 10:44 PM, Poul-Henning Kamp wrote:
In message4dffbaf4.4070...@onetel.net, Dr. David Kirkby writes:
1) Higher temperature devices (like 105 deg C) will be more relieable than low
temperature ones like the standard 85 deg C cap. I'm sure at high temperatures,
You should check both
electrolytics - any disadvantages of high
temp ones?
On 06/20/11 10:44 PM, Poul-Henning Kamp wrote:
In message4dffbaf4.4070...@onetel.net, Dr. David Kirkby writes:
1) Higher temperature devices (like 105 deg C) will be more relieable
than low
temperature ones like the standard 85 deg C cap
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