What is the use of ferrite core?
cpliu
ferrite core. According to the manual, I should attach it to a AC
adapter. It does not explain what it does to AC adapter. Does anyone
know why I should use it?
Thanks,
cpliu
Robert E. Williams
The ferrite core is a line filter to block any high frequency signals
that may be on your AC lines. Nowadays, people put all kinds of high
frequency stuff on their AC lines. Normally, most AC adapters have a
little transformer that does a pretty good job of blocking high
frequency signals. Nikon's adapter may not use a transformer or they
just want to be extra cautious. I'd just go ahead and use it.
Regards.....Bob Williams
Billy
Your camera probably won't pass spec without it.
No damage to your camera, but others may get
pissed.
John
John
Charles B. Naumann
it.
Charles Naumann
In rec.photo.digital Robert E. Williams <myt...@home.com> wrote:
: Hi cpliu,
: The ferrite core is a line filter to block any high frequency signals
cpliu
cpliu
Bertho Boman
from getting into the electronics inside the camera.
Bertho
boman
======================
Dave Haynie
wrote:
>It works both ways. It is also used to prevent external interference
>from getting into the electronics inside the camera.
Not really -- you use a shield for that. It's also extrememly rare
when a product is unduely influenced by external RF (a bit more likely
is conducted interference, such as via ground loops). And for a
digicam, if this was really a means to shield the device in the
comfort of your home, you're be completely doomed out in the real
world, where RF emissions are often 100's of times greater (I was
working at a carnival once where 25ft unshielded cable I used for
remote camera trigger was picking up about a volt and a half, just
clean out of the air).
Typically, if a product ships with a clamp-on or slip-in ferrite ring,
it's an indication that the product failed in FCC (or CE in Europe)
testing on radiated RF emissions. You try to avoid having these
external if you can, but they're much easier to add last-minute that
way.
Dave Haynie | frog pond media | dha...@jersey.net
"Whomever dies with the most cameras wins"
Stuart Willis
The fishing sinker is the other bit marked "Coolpix" ;-)
Stuart Willis
Sunny Queensland, Downunder.
mailto:Et...@uq.net.au
John wrote:
>
> Darn! I thought it was a free sinker for my fishing gear.
>
> John
> > The ferrite core is a line filter to block any high frequency signals
> > that may be on your AC lines. Nowadays, people put all kinds of high
> > frequency stuff on their AC lines. Normally, most AC adapters have a
> > little transformer that does a pretty good job of blocking high
> > frequency signals. Nikon's adapter may not use a transformer or they
> > just want to be extra cautious. I'd just go ahead and use it.
> > Regards.....Bob Williams
> > cpliu wrote:
> > >
-
Pete
(or possibly out of) the mains adaptor. Probably in accordance of EC
electrical interferance rules.
I doubt it'll make much difference to anything as it is a bit of a job
creation exercise.
(the ferrite core blocks certain high frequencies of noise)
Pete
cpliu <chanc...@yahoo.com> wrote in message
news:MPG.1406677018806a4e989681@news-server...
Bruce
image!!!
Bertho Boman
A shield is used to prevent radiated signals from getting in and out.
A ferrite choke (or other types of chokes) is preventing the wires
attached to the electronics from acting as antennas. Again, both
ways. It prevents conducted signals from coming in and conducted
signals going out.
Some products are only tested for spurious radiation leaving the
equipment and the manufacturer might not test for immunity to external
signals but the ferrite will help for that also. (I do this type of
stuff for a living)
Bertho Boman
======================================
dben...@my-deja.com
The ferrite core is to improve the units Electro Magnetic Interference
(EMI) signature. This enables them to legally ship the unit. If you
don't install the ferrite core your camera may interfere with your TV
or your neighbors when it is running off the adapter.
The ferrite is lossy at RF causing the wires to not radiate as much
energy as they would without it. Normally not putting the ferrite on
would not affect the units functionality.
Don
In article <MPG.140667dce725b90d989682@news-server>,
Sent via Deja.com http://www.deja.com/
Before you buy.
Charlie Brown
>In my Nikon Coolpix 800 package, there is a small plastic thing called
>ferrite core. According to the manual, I should attach it to a AC
>adapter. It does not explain what it does to AC adapter. Does anyone
>know why I should use it?
>
>Thanks,
>
>cpliu
Technical answer:
The ferrite core is a choke.
A choke acts to attenuate AC.
Since the adapter line the choke goes on is a DC line, there shold be
no AC on it. The choke acts to reduce any AC on the line, to reduce
interference to any other electronic devices nearby (which includes
the camera itself).
Pete
john dodsworth
Jay A
camera itself, not other appliances such as a TV. On many electrical
devices, cords which are attached can and do act like antennae, sometimes
picking up radio signals and/or interference from other devices. This can
cause interference to the device itself (in this case the digital camera).
The ferrite core acts as a choke, or filter along the cord thus helping to
prevent the interference from reaching the camera. Many people place ferrite
cores on devices such as telephone lines or stereo speaker wires in order to
filter out interference from local CB or Ham Radio transmissions.
While it is possible for a digital camera to cause interference to other
devices such as TV sets, this is unlikely unless the camera is placed
extrememly close to the other device. If the camera were to cause
interference to a neighbor's TV set, something would be very very wrong with
it. Normally, it just does not radiate anything even close to the kind of
power that would be needed to do that.
Jay
<dben...@my-deja.com> wrote in message news:8np6a4$vmn$1...@nnrp1.deja.com...
Southern Comfort
wrote:
I beg to differ. Those darn things are always for blocking RF from
escaping FROM the device. This is to make sure the SAID device passes
FCC rules.
Computers signals are all guarded the same way. Serial USB Parrallel
Keyboard Monitors are all block with such cores.
payam...@gmail.com
> In my Nikon Coolpix 800 package, there is a small plastic thing called
> ferrite core. According to the manual, I should attach it to a AC
> adapter. It does not explain what it does to AC adapter. Does anyone
> know why I should use it?
>
> Thanks,
>
> cpliu
nospam
> On Thursday, August 17, 2000 3:00:00 AM UTC-4, cpliu wrote:
> > In my Nikon Coolpix 800 package, there is a small plastic thing called
> > ferrite core. According to the manual, I should attach it to a AC
> > adapter. It does not explain what it does to AC adapter. Does anyone
> > know why I should use it?
>
RichA
> In my Nikon Coolpix 800 package, there is a small plastic thing called
> ferrite core. According to the manual, I should attach it to a AC
> adapter. It does not explain what it does to AC adapter. Does anyone
> know why I should use it?
>
>
> cpliu
Used to be common, often integrated into connection cables, before they gave up completely on keeping RF interference under control.