Price: $95,000.00

Key Features:
• Patented Double Electrically Isolated (DEI) modular enclosures
• Double layer copper screen provides excellent attenuation levels
• Resilient clamping system
• Utilizes two separate conductive electromagnetic barriers
• Durable, expandable, easy to assemble, easy to move
• Relocation service available
• DEI concept provides a hear-through see through working environment

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Standard modular or custom DEI screen enclosures provide the maximum shielding performance available in a "hear-through, see-through" structure. Copper screen enclosures are used where absence of a sense of confinement or where casual observation from the outside is desirable. The superior shielding characteristics obtained from ETS-Lindgren screen enclosures are primarily the result of DEI construction, which permits screen to be used where solid double shield construction would ordinarily be used.

In some applications, screen enclosures eliminate the need for additional ventilation. Where required, exhaust fans or connections to existing air handling systems are easily added. Screen rooms are very easy to assemble because of the inherent flexibility of the shielding material which requires lower clamping pressures than are generally required with steel and other rigid materials.

Kick-plates or protective paneling are used to protect the lower 32" on the inside and outside of each wall panel. Kick-plates are made of an attractive wood grain paneling. A color coordinated vinyl tile is installed over 3/4" plywood panels which are connected with 1/8" thick, 4" wide aluminum strips to provide an entirely flush modular floor system.

Materials
A heavier 22 x 22 x .015" copper wire mesh is offered for applications which require the advantages of screen, with the best possible high frequency microwave and improved low frequency magnetic attenuation characteristics.

• EXTERIOR SHIELD INTERIOR
• SHIELD MAGNETIC
• (14 kHz) ELECTRIC
• (14 kHz) PLANEWAVE MICROWAVE
• 10 GHz
• 450 MHz 1 GHz
• Copper Screen Copper Screen 68 dB 120 dB 110 - 120 dB 90 - 110 dB
• 50 - 80 dB

Construction
Standard Construction
The basis of ETS-Lindgren's DEI construction is its unique patented design, which permits double shield enclosures to be assembled from individual panels. Panels are designed to accommodate a variety of shielding materials which are attached to a strong, nonconductive wood frame. When the shielding is overlapped and the panels bolted together, a resilient, as opposed to rigid, clamping pressure is applied, making it easier to achieve and maintain an RF tight seal. This design requires 18 inches of space around the perimeter for assembly.

On midwall and ceiling panels, an angle bar clamping system is used that also provides additional structural support. Individual panels can be easily modified to accommodate accessories and special enclosure size requirements.

Inside Bolting Construction
This optional construction style enables the enclosure to be completely assembled from the inside, to accommodate areas with tight restrictions. This design employs separate clamping strips to interconnect panels. In other aspects, it is similar to standard construction and maintains the DEI principle.

Floor
Special care is taken to protect the inside floor shield by covering it with a layer of 3/8" plywood. A separate walking surface consists of 1/8" vinyl tile on 3/4" A-C plywood panels, which are interconnected with 1/8" aluminum strips, to ensure a flush, durable floor capable of supporting 1,000 pounds per square foot. Floors can be strengthened to accommodate heavier loads when required.

Modular Panels
Standard DEI enclosures are of modular construction and assembled from panels which are interchangeable to facilitate expansion or modification. Modular construction permits nonstandard enclosure requirements to be met with a minimum number of special panels. The customer's size requirements determine the number of panels in the room. Special size enclosures, mobile rooms and portable enclosures are also available.

DEI Principle
The principle of isolation in a DEI modular enclosure is based on two completely contiguous (metal or mesh) shields electrically separated from each other except at the one point where they are connected together and grounded.

If the two shield surfaces are in contact with each other at numerous points, the effectiveness can begin to diminish to the level expected for a single shield. The graph in Figure 2 shows the difference in shielding effectiveness between single shield, double shield cell-type (not isolated) and double shield isolated construction.

ETS-Lindgren enclosures are the only enclosures that utilize the DEI principle on a single frame. ETS-Lindgren enclosures are constructed using a patented, bolt-together method of assembly that is effective and results in a modular enclosure that is durable, easy to move and simple to relocate.

ETS-Lindgren's unique resilient clamping system requires no periodic maintenance and permits enclosures to be assembled and disassembled without losing shielding effectiveness.

The Double Electrically Isolated principle is available on enclosures ranging from standard sized enclosures to as large as the requirements demand.

Doors
The ETS-Lindgren DEI door employs a number of unique proprietary and patented features which contribute to its superior performance characteristics and durability. All hardware and door seals are designed to maintain electrical isolation between the inner and outer shields. Doors are side hinged and supported by three heavy duty hinges to provide sag-free mounting and have been cycle tested up to 25,000 operations.

A three-point roller bearing latching system applies uniform pressure to two sets of spring temper phosphor bronze contact fingers to provide leak-proof seals for both the inner and outer shields.

The three-point clamping system draws the door into a closed position when the 28" panic type handle is pulled up with a force of less than 30 pounds. A positive opening pressure is applied to the door when the handle is pushed down to open. The handle and lever arms, which apply clamping pressure, are adjustable as are the contact fingers. Single, double and vestibule door systems are available in most sizes and with a variety of options, including color-coordinated or wood-grained veneer finishes, view windows, access openings, ramps, locks, alarms, interlocks and microwave absorber seals. Flush floor systems are also optional. Optional auto latch door available.

Shielding Effectiveness
The effectiveness of a shielded enclosure is a measure of its ability to attenuate electromagnetic energy, which in its simplest form can be expressed in the following manner:

Shielding Effectiveness -

S.E. dB = 20 Log10( E1 / E2 ) Decibels

Where E1 is the properly measured field strength in volts/meter without the shield and E2 is measured field strength with the shield in place at a fixed test distance. In the case of a homogeneous material, total shielding effectiveness of a material is a function of:

SE dB = (R + A + B) Decibels

Where R is Total Reflection Loss, A is Total Absorption Loss, and B is Re-Reflection Loss. Reflection Loss occurs due to the impedance mismatch at the air-to-metal interfaces. Absorption Loss is a function of thickness and frequency for a given material. Where Absorption Losses are greater than 10 dB, Re-Reflection Loss can be disregarded.