Magnetic and electromagnetic shielding pdf xchange,duke energy charlotte report power outage,long term food storage calculator raid - Step 2

Basic Audio is a free introductory textbook to the basics of audio physics and electronics. The second type of shielding uses a different principle, but is also effective against magnetic fields. Outside the shield, the two fields are in the same direction and the combined magnetic field is increased.
With input transformers, which are particularly susceptible to magnetic fields because they have a magnetic core, the shielding often consists of an arrangement combining magnetic and electromagnetic shielding into one composite assembly. Used for years in industry to shield delicate electronic components from EMFs, this 80% Nickel alloy magnetic shielding foil is now available at affordable prices for home and office use. The Magnetic Shielding Foil can be formed into magnetic barriers on cellular phones, microwave ovens, doorbell transformers, VDTs, buried wiring, and more. In addition to increasing your distance from the tower, you can wrap the tower in magnetic shielding foil to greatly reduce magnetic field emissions.
The amount of shielding that you will achieve depends on many factors, including the size and shape of the shield. 2- Now slide the gaussmeter to the right, to the left, up, and down to identify how far you must shield to get to the 2 mG line. Make sure to check for additional sources of magnetic field (lights, wiring, appliances and so on), that may be located inside adjacent walls, floor, ceiling or within the same room. A circuit breaker box (or fuse box) in the bedroom, living room, kitchen, or other living space can be a real problem.
If you are handy, you can use the magnetic shielding materials listed below to make your own hinged shield. Another alternative is to mount the Giron directly on the wall and cover it with these attractive interior window shutters. GIRON Magnetic Shielding Film, which does not contain Nickel, is unlike any other magnetic shielding material available on the market today.
Suitable for small shields on magnets, motors, speakers and appliances such as refrigerators, vacuum cleaners etc. We have teamed with the design and engineering division of the Giron manufacturer to offer start-to-finish magnetic shielding solutions for residential, commercial, and industrial buildings. Enjoy the confidence of an experienced team to obtain excellent results, lowest cost, and on-time delivery.
Because we offer so many different matrials, of different widths, the easiest way to order rolled goods is by specifying how long the piece of material will be. When using a flat shield on a wall, floor, or ceiling to shield a source of field that is close to the shield (within 8 inches), plan to cover an area that extends at least to the 2 mG line. 1- Using your gaussmeter, slide along the surface of the wall to locate the hot spot to be shielded.
Click here for a short instructional video on doing a magnetic field survery for shield design.
While the special alloys in Magnetic Shielding Foil, Mag-Stop Plates, Joint Shield, and Metglas, exhibit high magnetic permeability, there are many factors which affect the amount of magnetic shielding you will achieve by using these materials. Because we have no control over many of these factors, we cannot and do not guarantee any specific shielding performance for a specific application of these materials. 3] In general, you will extend the shield at least 2 feet beyond the size of the circuit box (or other fairly concentrated source), in all directions. 5] Also remember that you will achieve the greatest % reduction up close to the center of the shield (where the field is strongest anyway). In the end, some experimenting is often necessary to ensure proper shield thickness and placement. Joint-Shield can also be used by itself as an excellent magnetic shielding material when a 4" width and adhesive backing is desirable (wrap it around wiring and conduit, speaker magnets, even small appliances like shavers and hair dryers!).
Combining high performance nanocrystalline magnetic shielding alloy sandwiched between layers of clear PET to achieve good performance and easy handling.
First line of defense for shielding strong magnetic fields from magnets, speakers, small transformers and motors.
Better: One or more layers of MagnetShield (closest to the source of field), followed by one or more layers of a high permeability material such as Joint-Shield or MagStop Plate.
For shielding jobs where you don’t need a high attenuation, this unique material is just the ticket.
Attention pacemaker wearers, welders and anyone wanting to shield their upper body from magnetic fields!
Made with 10mm diameter, shiny galvanized, 16g round mild steel rings which are butted closed. At last, we are proud to offer wiring which actually reduces EMF emissions to extremely low levels.
The result is a high quality wire with the lowest possible EMF emissions (over 90% reduction compared to standard wire).
MµCord™ flexible “appliance cord style” for re-wiring lights and appliances, making extension cords, etc.
Magnetic shielding is most effective against steady magnetic fields and low-frequency induction, such as hum.
Magnetic shielding is a mechanical solution, most of the time issued from a sheet metal process, done to solve a problem of low frequency  electromagnetic interference. Shielding channels the magnetic lines of the electromagnetic wave at frequencies from 0.1 to 10,000 Hz.


In the case of alternating fields (type 50 Hz), we must consider two factors: the concentration and the eddy currents that oppose the external fields. Unlike the electrical shield, magnetic shielding deflects the field lines ; so a single disc is therefore a shield. Electromagnetic shielding is the process of reducing electromagnetic field or radiation in space. Electromagnetic shielding helps reduce the degree of electromagnetic interference by reflection or absorption. Magnetic shielding foil : Cast out of 80% nickel alloy, this foil is used to protect delicate electronic equipments from electromagnetic shielding in the industry. Joint shield : This is a fully hydrogen annealed magnetic shielding alloy provided with adhesive backing.
Medical: Prevents interference of electromagnetic waves given out by medical devices especially during critical operations. Electromagnetic shielding does not use a magnetic material, but rather one that conducts electric current well, such as copper or aluminum. As well as providing increased protection, the combination makes the arrangement more effective over the entire frequency range. With snug fitting shapes, get as much as 75% attenuation of the magnetic fields with one thickness.
Strong magnetic field emissions (depending on how much electric current is flowing) and electric field emissions can make the nearby area hazardous to occupy, especially for long periods. Suitable for high field strength applications requiring high saturation and good permeability, it is both thin and strong, and unlike Mu-metal™ it is very tolerant to bending or shaping without losing its shielding properties. Cuts neatly with snips or sheet metal tools, and can be used either flat or molded into shapes for best performance.
The 30" wide "fully hydrogen annealed" plates offer the best shielding available (up to 10 times the shielding effectiveness of stress-annealed alloy) and should not be soldered, welded, or heated in any way. The list of such factors includes: size and shape of the source of the magnetic field, size and shape of the shielded area, seams in the shielding material, frequency of the magnetic field, distance from shield to source, orientation of shield to the source, thickness and heat treatment of shielding material, etc.
Also, note that foils, ribbons and plates, once cut by us to your specifications, are not refundable. Remember to make measurements under various conditions, as the readings will change according to how much electric current is flowing at the time of the reading.
This will influence the choice for thickness of the Mag-Stop Plate shield, or the number of layers used.
In other words, the field will be stronger at the edge of the shield as compared to having no shield at all. This occurs when the Earth's magnetic field (about 400 mG) interacts with a large shield, reducing its effectiveness, unless special "high saturation" (MagnetShield) shielding alloys are incorporated into the design. Joint-Shield can be shaped by hand, without the need for special tools, but watch the sharp edges.
Very light weight and flexible, easily trimmed with scissors this material will provide good high frequency magnetic shielding for moderate to low intensity fields below 1000 kHz.
Strong magnetic fields are harder to shield because they tend to "saturate" the shielding material. If you want to shield 2 adjacent magnets from eachother, each magnet should have its own shield. Only 0.010 inch thick, PaperSHIELD is flexible and can be easily cut with a scissors and shaped by hand into simple or very complex shapes.
Replacing existing wire with MµCord is likely to be much less costly, more effective, and probably more convenient than shielding. Simply cut wire to desired length and add a plug to one end, or plug one end and socket on the other. Magnetic shielding prevents the magnetic field that causes the induction from reaching the low-level circuit. At higher frequencies, it becomes less and less effective because the magnetism takes time to be induced in the material of the shield.
The aim of electromagnetic shielding is to isolate sensitive apparatus especially the critical components  from electric and magnetic fields.
It also finds application in shielding devices of daily usage like mobiles, microwave ovens. When the magnetic field causing the induction fluctuates, it causes current to flow in the shield.
Because it depends on fluctuating fields, this kind of shield is completely ineffective against steady magnetism. The magnetic shielding takes care of frequencies down to zero or d-c and begins to become ineffective at frequencies between 60 to 300 cycles.
Best suitable for weak and moderate levels of magnetic fields in miliGauss levels, with low saturation and high permeability alloys. Shielding is certainly possible, but the shield must not hamper quick and easy access to the controls inside the box.
It’s a picture (or poster) in a nice frame, with high performance Giron shielding material behind the picture. We'll help you find the right solution, saving time, money, and creating satisfied customers! Now you can simply replace your Switch Plate or Outlet Cover with these custom shielded ones.


So, for example, if you order 22 linear feet of a material, you will get a piece that is 22 feet long x the width of the material. Hydrogen annealed plates have 2 small holes pre-drilled near one end which may be used for mounting.
Also, find out if there are other sources, such as wiring leading to the circuit box, nearby fluorescent lights, etc. Most would recommend that you achieve readings of 2.5 mG or less in areas where people will be spending a lot of time.
This is a generous .010" thick, fully hydrogen annealed magnetic shielding alloy with adhesive backing (rated 0 - 200°F) on one side.
This 4" wide foil is a hefty .010" thick and has an exceptionally high magnetic saturation of 21400 Gauss and maximum permeability of 4000. High saturation and moderate permeability make this ideal for shielding weak magnets, or stronger magnets with many layers of shielding.
Composed of individual metal links which give good flexibility and plenty of air circulation.
For example, if you don’t need the head covering, you could move those links to achieve more shoulder or heart coverage.
The faster the inducing magnetic field fluctuates, the less effective the shield is in conveying the magnetic field around the shielded circuit. This is done by placing an electrically conductive surface or magnetic material between between source of electromagnetic disturbance and the surface to be protected. A special shielding door provided with a mechanical locking device is installed at the entrance of the room. Due to their special design these provide high quality shielding for electric circuit boxes and computer users. Use of this web site constitutes acceptance of the InnovateUs Terms of Use and Privacy Policy. This current in the shield sets up its own magnetic field that opposes the original inducing magnetism, and the two fields tend to cancel inside the shield. It is also comparatively ineffective against low-frequency fluctuation, and only becomes really effective at higher frequencies. The electromagnetic shield^on the other hand, begins to become effective between 60 and 300 cycles, and the combined protection is effective for all frequencies.
However, when Magnetic Shielding Foil is used in multiple layers it provide even greater reduction. Magnetic field reduction is 30 to 60% up close to the surface, depending on wire configuration.
Can be formed into magnetic barriers on cellular phones, microwave ovens, doorbell transformers, VDTs, buried wiring, and more. Just right when you need to cut magnetic shielding materials including Giron, MagnetShield , and Magnetic Shielding Foil. Simply butt the Mag-Stop plates tightly together, and "tape" over the seam with Joint-Shield high permeabilty alloy.
Tin plated for excellent corrosion resistance and better conductivity, it can be soldered or painted. This material is particularly suited for achieving precise levels of partial shielding as you can add exactly the right number of layers to achieve the desired result. The inducing field passes into the shield, around the circuit to be shielded and out at the other side. The efficiency of the electromagnetic shielding is achieved due to cellular holes  which serve as waveguide filter. With snug fitting shapes, get as much as 75% attenuation of the magnetic field with one thickness. This method offers much less bulk and better appearance than the old overlap technique and provides excellent shielding integrity. This reduces the induction inside the shield by a factor dependent upon the permeability of the magnetic material of which the shield is made, the thickness of this material that provides a magnetic conducting path, and the frequency of the magnetic fluctuation.
Hence shielding is being implemented in the directives and technical standards aimed at the cause of preventing Electromagnetic pollution. In our tests, a 2-foot section of Giron in a 24x36 inch frame provided 50-70% reduction of magnetic field. Works with AC or DC magnetic fields (0-1000 Hz), and will tolerate temperatures from 32° to 140°F. Simple to use: just cut to desired length with a heavy scissors, peel the protective backing and press into place! Peel and stick adhesive on the other side permits easy and semi-permanent mounting almost anywhere.
If you need a shield larger than what is suggested here, just contact us, we will be happy to assist you.
Laminated with a 0.005 inch glass reinforced polypropylene tape which is UV sensitive, cover if installation is exposed to direct sunlight. Make sure you have enough room between outlet and nearby moldings for these larger than standard covers.



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