http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* NiMH new battery conditioning - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/642feb09361f607e?hl=en
* zebra connector - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/22ac512ae9f1d16c?hl=en
* Valves badged Orange , rebadged what make? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b405f7894dddeac4?hl=en
* WHAT IS ISLAM? ???????? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/71561ac87a746849?hl=en
* Fuse: fast blown vs slow blown - 16 messages, 7 authors
http://groups.google.com/group/sci.electronics.repair/t/075c97d6b6b6e1f0?hl=en
* Is there a fuse on a Samsung SV4000? - 3 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/d375f8c622c671d0?hl=en
==============================================================================
TOPIC: NiMH new battery conditioning
http://groups.google.com/group/sci.electronics.repair/t/642feb09361f607e?hl=en
==============================================================================
== 1 of 1 ==
Date: Mon, May 30 2011 10:57 pm
From: "Phil Allison"
"Jeff Liebermann"
>
>>** You got something against NiMh cells ?
>
> Yep. I don't like them.
** Wanker.
>>I would never mistreat NiMH AA cells the way you just have.
>
> I didn't have time to do it the right way (20 hr discharge).
** The 15 min charging was the abuse - fool.
> I can do
> it again with a longer discharge time and lower current.
** The 15 min charging was the abuse - fool.
>>15 minute charging is absurd for any cell NOT designed for such abuse - it
>>causes overheating with new cells and destruction of older ones.
>
> True for the Duracell,
** True for all of them - fool.
> However, the recommended battery charger is a quick charger:
> <http://data.energizer.com/PDFs/ch15mn2.pdf>
> with a 15 minute charge time.
** They would - since they sell the fucking things.
Energiser sell a whole range of chargers designed to destroy NiMh cells.
Means they sell more cells.
> I've been testing batteries since about 2005
** I've been doing it since 1979.
> However, I will point out that many
> NiCd batteries can be quick charged at ridiculously high rates,
** Only a rare few, specially designed NiCds were designed for it -
Sanyo's red " F " cells being one.
The issue is the HIGH probability of OVERCHARGING and hence over heating
with consequent internal damage.
> Incidentally, the Sanyo ENELOOP battery data sheet recommends fast
> charging at 2A for 1.1 hrs:
> <http://www.eneloop.info/fileadmin/EDITORS/ENELOOP/DATA_SHEETS/HR-3UTGA_data_sheet.pdf>
** Got nothing to do with a 15 minute charge in a cheap POS charger like you
did.
>>A 1C discharge test will never give the rated capacity figure with NiCd or
>>NiMH.
>
> I indicated that in my posting as:
>
>> I didn't want to wait 20 hrs per test to get the official rated
>> capacity, so I elected to run the tests at 1C which resulted in about
>> a 45 minute test, but also resulted in a much lower capacity result.
** Will you admit to being a raving lunatic ???
And save me the trouble of demonstrating it to the world over and over.
>>IME - the idea that new cells have a "running in "period is a MYTH
>>invented by retailers back in the 1970s when consumers were first sold AA
>>and C size NiCds and found their performance disappointing when compared
>>to
>>alkalines.
>
> Maybe.
** Definitely.
>>The inherent lower terminal voltage and cell mAH capacity were the real
>>reasons.
>
> Agreed.
** No elaboration was needed.
> I'm rather mystified by the results.
** Bad science is no mystery.
..... Phil
==============================================================================
TOPIC: zebra connector
http://groups.google.com/group/sci.electronics.repair/t/22ac512ae9f1d16c?hl=en
==============================================================================
== 1 of 3 ==
Date: Tues, May 31 2011 1:03 am
From: "N_Cook"
Smitty Two <prestwhich@earthlink.net> wrote in message
news:prestwhich-069B08.10540030052011@news.eternal-september.org...
> In article <is0gie$ncs$1@dont-email.me>, "N_Cook" <diverse@tcp.co.uk>
> wrote:
>
> > Vale <vale@fastwebnet.it> wrote in message
> > news:kWOEp.29095$GZ3.9073@tornado.fastwebnet.it...
> > > My expensive multimeter has got broken plastic pins that hold the lcd
> > disply
> > > on the pcb.
> > > In spite of all my efforts I can't correctly align the zebra contacts.
> > > Is there anybody willing to explain me how to do it?
> > > Thanks
> > >
> > >
> >
> >
> > Zebra contacts are self-aligning thats the point of them. Assuming
contacts
> > and zebra are clean and good and gap between pcb and LCD glass is
correct
> > then all should be well, at least one zebra contact should lie between
each
> > pcb pads and its corresponding lcd land
>
> With the alignment pins broken off, how do you suggest OP correctly
> positions the display WRT the PCB?
I assume some stubs or marks remain where the plastic pins broke off. Drill
and glue some replacement pins , as long as within half a land of true then
should line up
== 2 of 3 ==
Date: Tues, May 31 2011 8:36 am
From: Jeff Liebermann
On Mon, 30 May 2011 17:43:17 +0200, "Vale" <vale@fastwebnet.it> wrote:
>My expensive multimeter has got broken plastic pins that hold the lcd disply
>on the pcb.
Does your expensive multimeter have a manufacturer and model number?
>In spite of all my efforts I can't correctly align the zebra contacts.
>Is there anybody willing to explain me how to do it?
What does the display show? A few segments missing? A few digits
missing? Nothing perhaps?
You might align it visually. The problem is positioning the strip at
an angle, where the conductive parts of the Zebra strip will short two
adjacent contacts on either the display or the PCB. Without any means
to align the display and the PCB, that's quite a challenge. If the
Zebra strip is the same spacing as the display and PCB contacts, then
correct alignment is mandatory. However, if the spacing on the Zebra
strip is considerably smaller than the PCB and LCD spacing, then the
connector can tolerate considerable misalignment and still work.
There's also a question of how are you going to keep it aligned and
properly compressed with a broken mounting frame. Methinks your best
approach is to find the broken plastic pieces, and attempt to repair
the plastic frame first. Another approach would be to identify the
manufacturer of the mounting frame/pins/whatever, and obtain a
replacement. Lastly, if the multimeter is truly expensive and a
repair is justified, the manufacturer may have a repair/exchange
program.
Also, after many years, some elastometric and other rubber connectors
tend to leak whatever oil is used to keep the rubber flexible. When
connected, it's not a problem, but once moved, the oil film acts as an
insulator. Lightly clean both the PCB and LCD with alcohol to remove
any oil.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
== 3 of 3 ==
Date: Tues, May 31 2011 9:32 am
From: "Vale"
"Jeff Liebermann" <jeffl@cruzio.com> ha scritto nel messaggio
news:ev1au6l4fk6hevq9fvne7qhm8q5cp0qqrg@4ax.com...
> On Mon, 30 May 2011 17:43:17 +0200, "Vale" <vale@fastwebnet.it> wrote:
>
>>My expensive multimeter has got broken plastic pins that hold the lcd
>>disply
>>on the pcb.
>
Thanks all.I solved, hope for long time.
I've been luky, the dirt that was on the meter case display window was
perfectly corresponding to the dirt line on the display.
So I found the right position.
It has been not so easy to align the display on pcb, I supplied the meter
with a voltage, tried hundreds of positions until it displaied the rights
measurement.
I got help from a pair of chinese spring loaded clamps to firmly block the
display and put some drops of cyanoacrylate on corners.
Than used plenty of epoxy glue to make it stable.
The meter now works quite perfectly, only the last digit is incomplete, but
I'm happy anyway.
At least that experience has provided more knowledge to zebra gadgets.
Thanks everybody and....don't keep your meters too clean!
==============================================================================
TOPIC: Valves badged Orange , rebadged what make?
http://groups.google.com/group/sci.electronics.repair/t/b405f7894dddeac4?hl=en
==============================================================================
== 1 of 1 ==
Date: Tues, May 31 2011 1:10 am
From: "N_Cook"
The owner had lived with the "shaver" noise for months,but had gradually got
worse. Masked by the demand effect, no music - light buzz, high music
volume - loud buzz.
Absolutely quiet transformer now. Just hope the other end "E" does not play
up as that would require removing the Tx and its wiring from the chassis. It
is now tight up against the bobbin now so not too likely .
==============================================================================
TOPIC: WHAT IS ISLAM? ????????
http://groups.google.com/group/sci.electronics.repair/t/71561ac87a746849?hl=en
==============================================================================
== 1 of 1 ==
Date: Tues, May 31 2011 4:14 am
From: bv
WHAT IS ISLAM?
Can we find an explanation of the great universe? Is there any
convincing interpretation of the secret of existence? We realize that
no family can function properly without a responsible head, that no
city can prosperously exist without sound administration, and that no
state can survive without a leader of some kind. We also realize that
nothing comes into being on its own. Moreover, we observe that the
universe exists and functions in the most orderly manner, and that it
has survived for hundreds of thousand of years. Can we then say that
all this is accidental and haphazard? Can we attribute the existence
of man and the whole world to mere chance.
Man represents only a very small portion of the great universe. And if
he can make plans and appreciate the merits of planning, then his own
existence and the survival of the universe must also be a planned
policy. This means that there is an extraordinary power to bring
things into being and keep them moving in order.
In the world then must be a great force in action to keep everything
in order. In the beautiful nature there must be a Great creator who
creates the most charming pieces of art produces every thing for a
special purpose in life. The deeply enlightened people recognize this
creator and call him Allah "God". He is not a man because no man can
create or make another man. He is not an animal, nor he is a plant. He
is neither an Idol nor is He a statue of any kind because non of these
things can make itself or create anything else. He is different from
all these things because he is the maker and keeper of them all. The
maker of anything must be different from and greater than things which
he makes.
There are various ways to know God "ALLAH'' and there are many things
to tell about him. The great wonders and impressive marvels of the
world are like open books in which we can read about God. Besides, God
Himself comes to our aid through the many Messengers and revelations
He has sent down to man. These Messengers and revelations tell us
everything we need to know about God.
The complete acceptance of the teachings and guidance of God 'Allah'
as revealed to His Messengers Muhammad is the religion of Islam. Islam
enjoins faith in the oneness and sovereignty of Allah, which makes man
aware of meaningfulness of the Universe and of his place in it. This
belief frees him from all fears and superstitions by making him
conscious of the presence of the Almighty Allah and of man's
obligations towards Him. This faith must be expressed and tested in
actions, faith alone is not enough. Belief in one God requires that we
look upon all humanity as one family under the universal Omnipotence
of God the Creator and Nourisher of all. Islam rejects the idea of
chosen people, making belief in God and good actions the only way to
heaven. Thus, a direct relationship in established with God, without
any intercessor.
Islam is not a new religion. It is, in essence, the same message and
guidance which Allah revealed to all Prophets. Adam, Noah, Abraham,
Ismael, David, Moses and Jesus (PBUT). But the message which was
revealed to Prophet Mohammed (PBUT) is Islam in its comprehensive,
complete and final form.
The Quran is the last revealed word of Allah and the basic source of
Islamic teachings and laws. The Quran deals with the basis of creeds,
morality, history of humanity, worship, knowledge, wisdom, God-man
relationship, and human relationship in all aspects. Comprehensive
teaching on which, can be built sound systems of social justice,
economics, politics, legislation, jurisprudence, law and international
relations, are important contents of the Quran. Hadith, the teachings,
sayings and actions of Prophet Mohammed (PBUT), meticulously reported
and collected by his devoted companions. Explained and elaborated the
Quranic verses.
THE FUNDAMENTAL ARTICLES OF FAITH IN ISLAM
The true faithful Muslim believes in the following Principal articles
of faith:-
1. He believes in One God 'Allah', Supreme and Eternal, Infinite and
Mighty, Merciful and Compassionate, Creator and Provider.
2. He believes in all Messengers of God without any discrimination
among them. Every known nation had a warner or Messenger from God.
They were chosen by God to teach mankind and deliver His divine
message. The Quran mentions the name of twenty five of them. Among
them Mohammad stands as the last Messenger and the crowning glory of
the foundation of Prophethood.
3. Muslin believes in all scriptures and revelations of God. They were
the guiding light which the Messengers received to show their
respected peoples the Right Path of God. In the Quran a special
reference is made to the books of Abraham, Moses, David and Jesus. But
long before the revelations has been lost or corrupted. The only
authentic and complete book of God in existence in the Quran.
4. The true Muslim believes in the Angels of Allah. They are purely
spiritual and splendid beings whose nature requires no0061 Z food,
drink or sleep. They spend their days and nights in the worship of
God.
5. Muslim believes in the last Day of Judgement. This world will come
to an end someday, and the dead will rise to stand for their final and
fair trial. People with good records will be generously, rewarded and
warmly welcomed to the Heaven of Allah, and those with bad records
will be punished and cast into Hell.
6. Muslim believes in the timeless knowledge of God and His power to
plan and execute His planes and nothing could happen in His Kingdom
against His will. His knowledge and power are in action at all times
and command over His creation. He is wise and merciful, and whatever
He does must have a meaningful purpose. If this is established in our
mind and hearts, we should accept with good faith all that He does,
although we may fail to under stand it fully, or think it is bad.
THE FIVE PILLARS OF ISLAM
Faith without actions arid practice is a dead end, as far as Islam is
concerned. Faith by nature is very sensitive and can be most
effective. When it is not out of practice or out of use, it quickly
loses its liveliness and motivation power.
There are five pillars of Islam:
1 - The declaration of faith: To bear witness that there is none
worthy of worship except Allah, and that Mohammad (PBUH) is His
Messenger to all human beings till the Day of Judgment. The
Prophethood of Mohammad obliges the Muslims to follow, His exemplary
life as a model.
2 - Prayers: Daily, prayers are offered five times a day as a duty
towards Allah. They strengthen and enliven the belief in Allah and
inspire man to a higher morality. They purity the heart and prevent
temptation towards wrong - doings and evil.
3 - Fasting the month of Ramadan. The Muslims during the month of
Ramadan not only abstain from food, drink and sexual intercourse from
dawn to sunset but also sincerity and devotion. It develops a sound
social conscience, patience, unselfishness and will - Power.
4 - Zakkah: The literal and simple meaning of Zakkah is charity. The
technical meaning of this word designates the annual amount in kind or
coin which a Muslim with means must distribute among the rightful
beneficiaries. But the religious and spiritual significance of Zakkah
is much deeper and more lively. So it has humanitarian and
sociopolitical values.
5 - Hajj (Pilgrimage to Makkah): It is to be performed once in a
lifetime, if one can afford it financially and physically.
If you wish to know more about Islam, we prefer to visit the following
websites:
http://www.islamhouse.com/s/9661
http://www.thetruereligion.org
http://www.quran-m.com/firas/en1
http://www.usc.edu/dept/MSA/quran
http://www.quranexplorer.com/quran
http://www.rasoulallah.net/v2/index.aspx?lang=e
http://www.prophetmuhammed.org
http://www.chatislamonline.org/ar
==============================================================================
TOPIC: Fuse: fast blown vs slow blown
http://groups.google.com/group/sci.electronics.repair/t/075c97d6b6b6e1f0?hl=en
==============================================================================
== 1 of 16 ==
Date: Tues, May 31 2011 4:41 am
From: Man-wai Chang
How dangerous is it to replace a 500mA fast-brown fuse with a 500mA
slow-brown one?
--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 19:36:01 up 6 days 4:38 0 users load average: 1.22 1.09 1.06
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
== 2 of 16 ==
Date: Tues, May 31 2011 5:07 am
From: "Phil Allison"
"Man-wai Chang"
>
> How dangerous is it to replace a 500mA fast-brown fuse with a 500mA
> slow-brown one?
** Confucius once say:
" The quick brown fox jumps over the lazy dog "
Think about it ...........
.... Phil
== 3 of 16 ==
Date: Tues, May 31 2011 5:47 am
From: Globemaker
On May 31, 7:41 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
> How dangerous is it to replace a 500mA fast-brown fuse with a 500mA
> slow-brown one?
>
> --
> @~@ Might, Courage, Vision, SINCERITY.
> / v \ Simplicity is Beauty! May the Force and farces be with you!
> /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
> ^ ^ 19:36:01 up 6 days 4:38 0 users load average: 1.22 1.09 1.06
> 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
The danger, on a scale from 1 to 10 is 8. Some equipment can be
damaged in a millisecond, so a slow-blown fuse can result in a ruined
piece of equipment. For example, an integrated circuit could need 12
volts, but you plug in the wrong wall wart that has no labels on it.
It has 18 volts instead of 12 volts, but it uses the same diameter
coaxial connector. A fast fuse protects in 400 microseconds, but the
slow blow does not blow that fast so the 45 nanometer digital device
gets melted in 1000 microseconds.
== 4 of 16 ==
Date: Tues, May 31 2011 6:54 am
From: "Phil Allison"
"Globemaker"
The danger, on a scale from 1 to 10 is 8. Some equipment can be
damaged in a millisecond, so a slow-blown fuse can result in a ruined
piece of equipment. For example, an integrated circuit could need 12
volts, but you plug in the wrong wall wart that has no labels on it.
It has 18 volts instead of 12 volts, but it uses the same diameter
coaxial connector. A fast fuse protects in 400 microseconds, but the
slow blow does not blow that fast so the 45 nanometer digital device
gets melted in 1000 microseconds.
** Globemaker is one of those personages who sincerely believes that " Star
Trek " is a documentary.
And he has pointy ears too.
Beam me up Scotty ........
... Phil
== 5 of 16 ==
Date: Tues, May 31 2011 8:44 am
From: Tim Wescott
On 05/31/2011 04:41 AM, Man-wai Chang wrote:
>
> How dangerous is it to replace a 500mA fast-brown fuse with a 500mA
> slow-brown one?
It depends entirely on the equipment. Slow-blow fuses used to be more
expensive than fast-blow fuses, and tend to be less available. So a
designer's knee-jerk reaction may be to specify a fast-blow fuse
'because it's there'.
So there's a good chance that you can drop your slow-blow fuse in there
and everything will be fine, but if you do and burn something up, don't
come crying to me. I would hesitate to do so myself unless I knew what
was in the product, and felt that a slow-blow would work OK. I would
also hesitate to replace the fuse unless I knew why the original had
blown -- fuses blow for reasons, and if the equipment is dorked and
blowing fuses, then putting in more fuses will just make it more dorked.
Your best bet is to get the right fuse, and at least try to fix the
fault before you turn the equipment on with your shiny new fuse.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
== 6 of 16 ==
Date: Tues, May 31 2011 8:57 am
From: Man-wai Chang
> Your best bet is to get the right fuse, and at least try to fix the
> fault before you turn the equipment on with your shiny new fuse.
For a multimeter, is it always better to use a fast blow fuse?
--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 23:56:02 up 6 days 8:58 0 users load average: 1.05 1.09 1.06
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
== 7 of 16 ==
Date: Tues, May 31 2011 8:57 am
From: Man-wai Chang
> It has 18 volts instead of 12 volts, but it uses the same diameter
> coaxial connector. A fast fuse protects in 400 microseconds, but the
> slow blow does not blow that fast so the 45 nanometer digital device
> gets melted in 1000 microseconds.
Is the 13A BS1362 fuse a fast blow one?
--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 23:56:02 up 6 days 8:58 0 users load average: 1.05 1.09 1.06
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
== 8 of 16 ==
Date: Tues, May 31 2011 9:01 am
From: Tim Wescott
On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>> Your best bet is to get the right fuse, and at least try to fix the
>> fault before you turn the equipment on with your shiny new fuse.
>
> For a multimeter, is it always better to use a fast blow fuse?
It depends on the multimeter. I'd stick with the fast blow fuse and
stop putting it in 'voltage' mode when you've got it connected to
measure current.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
== 9 of 16 ==
Date: Tues, May 31 2011 9:02 am
From: Tim Wescott
On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>> Your best bet is to get the right fuse, and at least try to fix the
>> fault before you turn the equipment on with your shiny new fuse.
>
> For a multimeter, is it always better to use a fast blow fuse?
>
Check to make sure that the fuse isn't being used as the current shunt
-- if it is, then you don't just need the right current rating, you need
a matched fuse.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
== 10 of 16 ==
Date: Tues, May 31 2011 9:40 am
From: Man-wai Chang
> It depends on the multimeter. I'd stick with the fast blow fuse and stop
> putting it in 'voltage' mode when you've got it connected to measure
> current.
It's a glass one, 500mA fast blow according to the manual.
--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 00:36:01 up 6 days 9:38 0 users load average: 1.12 1.09 1.12
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
== 11 of 16 ==
Date: Tues, May 31 2011 9:51 am
From: Jeff Liebermann
On Tue, 31 May 2011 09:02:08 -0700, Tim Wescott <tim@seemywebsite.com>
wrote:
>On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>>> Your best bet is to get the right fuse, and at least try to fix the
>>> fault before you turn the equipment on with your shiny new fuse.
>>
>> For a multimeter, is it always better to use a fast blow fuse?
>Check to make sure that the fuse isn't being used as the current shunt
>-- if it is, then you don't just need the right current rating, you need
>a matched fuse.
Chuckle. If a fuse were used as a current shunt, then when the fuse
blows, instead of a few millivolts across the fuse, the meter now gets
the full voltage of whatever is being measured. The fuse holder
contact resistance will probably be larger than the wire resistance in
the fuse (fast blow). I don't think anyone uses a fuse as a current
shunt.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
== 12 of 16 ==
Date: Tues, May 31 2011 9:54 am
From: Jeff Liebermann
On Tue, 31 May 2011 23:57:58 +0800, Man-wai Chang
<toylet.toylet@gmail.com> wrote:
>> It has 18 volts instead of 12 volts, but it uses the same diameter
>> coaxial connector. A fast fuse protects in 400 microseconds, but the
>> slow blow does not blow that fast so the 45 nanometer digital device
>> gets melted in 1000 microseconds.
>
>Is the 13A BS1362 fuse a fast blow one?
That's the number of the plug, not the fuse:
<http://en.wikipedia.org/wiki/BS_1363>
It does have a fuse inside, but I don't know the value or type.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
== 13 of 16 ==
Date: Tues, May 31 2011 10:16 am
From: Winston
Tim Wescott wrote:
> On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>>> Your best bet is to get the right fuse, and at least try to fix the
>>> fault before you turn the equipment on with your shiny new fuse.
>>
>> For a multimeter, is it always better to use a fast blow fuse?
>
> It depends on the multimeter. I'd stick with the fast blow fuse and stop
> putting it in 'voltage' mode when you've got it connected to measure
> current.
That's 'current' mode when you've got it connected to measure
voltage, yes?
--Winston
== 14 of 16 ==
Date: Tues, May 31 2011 11:07 am
From: Tim Wescott
On 05/31/2011 10:16 AM, Winston wrote:
> Tim Wescott wrote:
>> On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>>>> Your best bet is to get the right fuse, and at least try to fix the
>>>> fault before you turn the equipment on with your shiny new fuse.
>>>
>>> For a multimeter, is it always better to use a fast blow fuse?
>>
>> It depends on the multimeter. I'd stick with the fast blow fuse and stop
>> putting it in 'voltage' mode when you've got it connected to measure
>> current.
>
> That's 'current' mode when you've got it connected to measure
> voltage, yes?
Uhhh...
D'oh!
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
== 15 of 16 ==
Date: Tues, May 31 2011 11:44 am
From: Jamie
Man-wai Chang wrote:
>> Your best bet is to get the right fuse, and at least try to fix the
>> fault before you turn the equipment on with your shiny new fuse.
>
>
> For a multimeter, is it always better to use a fast blow fuse?
>
yes
== 16 of 16 ==
Date: Tues, May 31 2011 11:47 am
From: Jamie
Jeff Liebermann wrote:
> On Tue, 31 May 2011 09:02:08 -0700, Tim Wescott <tim@seemywebsite.com>
> wrote:
>
>
>>On 05/31/2011 08:57 AM, Man-wai Chang wrote:
>>
>>>>Your best bet is to get the right fuse, and at least try to fix the
>>>>fault before you turn the equipment on with your shiny new fuse.
>>>
>>>For a multimeter, is it always better to use a fast blow fuse?
>
>
>>Check to make sure that the fuse isn't being used as the current shunt
>>-- if it is, then you don't just need the right current rating, you need
>>a matched fuse.
>
>
> Chuckle. If a fuse were used as a current shunt, then when the fuse
> blows, instead of a few millivolts across the fuse, the meter now gets
> the full voltage of whatever is being measured. The fuse holder
> contact resistance will probably be larger than the wire resistance in
> the fuse (fast blow). I don't think anyone uses a fuse as a current
> shunt.
>
Hush, you wasn't suppose to notice that! Built in obsolescence.
Jamie
==============================================================================
TOPIC: Is there a fuse on a Samsung SV4000?
http://groups.google.com/group/sci.electronics.repair/t/d375f8c622c671d0?hl=en
==============================================================================
== 1 of 3 ==
Date: Tues, May 31 2011 9:47 am
From: myfathersson
The power has completely gone off and it is still plugged in. I cant
see any fuse on the back but does anyone know if there is one on the
power supply inside please?
I found a page where they SAY they have a service manual to down load
at http://www.eserviceinfo.com/downloadsm/148/Samsung_SV-4000W.html
but where it says NOW DOWNLOADING, nothing seems to download.
I can search on their Samsung page at http://www.eserviceinfo.com/equipment_mfg/Samsung_4.html
but there doesnt seem to be an appropriate one there? Does anyone here
know how to navigate their site?
== 2 of 3 ==
Date: Tues, May 31 2011 10:16 am
From: myfathersson
Sorry, let me re-phrase that: DOWNLOADING NOW means you have to click
on some virtually hidden link two thirds down on the page to download
Doing that downloads something called a .djvu file. which requires
installing Nuance Software .pdf reader.
When you do that, it just tells you that it cant open the mysterious
286kb sv4000w.djvu file you have just downloaded!
== 3 of 3 ==
Date: Tues, May 31 2011 10:43 am
From: myfathersson
Sorry, let me re-phrase that: DOWNLOADING NOW means you have to click
on some virtually hidden link two thirds down on the page to download
Doing that downloads something called a .djvu file. which requires
installing Nuance Software .pdf reader.
When you do that, it just tells you that it cant open the mysterious
286kb sv4000w.djvu file you have just downloaded!
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