Founded in 1972, Universal Shielding Corp. (USC), has been a pioneer in developing products and systems for Radio Frequency Interference and Electromagnetic Interference (RFI/EMI).

Since 1972, USC has engineered, erected and tested in excess of 17,000 installations throughout the world, for government agencies, industrial corporations and medical facilities.

USC an provide a shielded enclosure of any size; from the smallest prefabricated uint for an R & D lab to the largest and most complex custom-built installations for a computer of communications center according to your requirements.

Advantages of a USC Enclosure

Construction Details

Design Checklist

Universal Shielding's USC 26 shielding system is desinged to meet or exceed the vast majority of shielding requirements. This system is available in both standard modular enclosures and custom-designed modular enclosures to meet exact specifications in government, industry, research and development, university, medical or hospital use.

The basic design incorporates production techniques which require no gasketing materials of any kind. Weld nuts on the corner and intermediate framing members elimintate screws that penetrate the outer framing members; thus ther can be no RFI/EMI leakage as a result of a loose screw. In addition, thie exclusive USC weld-nut feature provides a structure tha tis tamper-proof from the outside... an important consideration in Secure Communications. USC enclosures can be designed to accomodate rasied floors fro computer installations, suspended celings with recessed lighting, anechoic absorber and ferrite tile.

The basic purpose of a shielded enclosure -to attenuate radio-frequency and electromagnetic interference- is defeated if the doors, RF air vents, waveguide penetrations, etc. do not provide attenuation comparable to that of the floors, walls and ceiling. In addition, the door closure meghanism must be trouble-free. The USC-26 system fulfills all of these requirements -a fact proven, not only in our test programs, but also demonstradted by worldwide installations since 1972.

Typical attenuation performance for USC-26 shielded enclosures

Magnetic Fields	Electric Fields	Plane Wave	Microwave
1 KHz - 28 dB	1 KHz - 120 dB	100 MHz - 110+ dB	1 GHz - 110+ dB
10 KHz - 58 dB	10 KHz - 120 dB	400 MHz - 110+ dB	10 GHz - 110+ dB
200 KHz - 100 dB	100 KHz - 120 dB	1000 MHz - 110+ dB	18 GHz - 110+ dB
1 MHz - 110 dB	10 MHz - 120 dB
	100 MHz - 120 dB

Click the links to view images of the USC-26 shielded enclosure

The USC-44 model provides and interference free environment which speeds testing to enable one to obtain reliable test data.

This model employs the same framing system outlined above. The lower half of the enclosure utilizes the same solid panel construction as the USC-26.

The upper part of the enclosure consists of a double layer of copper screen panels.

Advantages of the USC-44

• Facilitates communication between the interior and exterior of the enclosure.
• Dedicated ventilation is not required.
• Visual observation of test ing is possible from the exterior of enclosure.
• Eliminates sense of confinement for the engineer.

Typical attenuation performance for USC-44 shielded enclosures

Magnetic Fields	Electric Field	Plane Wave	Microwave
1 KHz - 18 dB	1 KHz - 100 dB	100 MHz - 100 dB	10 GHz - 63 db
14 KHz - 50 dB	10 KHz - 100 dB	400 MHz - 100 dB
	100 KHz - 100 dB	1000 MHz - 90 dB
	10 MHz - 100 dB	2 GHz - 80 dB
	100 MHz - 100 dB

Click the links to view images of the USC-44 shielded enclosure

USC manufactures an entire series of prefabricated cabinets developed from the USC-26 and USC-44 designs. In addition, USC also offers a series of welded cabinets. These cabinets are offered with RCM-154 or RCM-254 door desin, thus providint th uinti with extraordinary shielding attenuation. Cabinets are portable an can be placed on desks or workbenches. If large cabinets are deired, movable platforms can be provided.

Optional accessories listed below can be installed in cabinets as requested.

Each cabinet is factory tested at 1 GHz or at the customer's operating frequency prior to shipment.

Cabinet shielding attenuation characteristics

Model	Magnetic	Electric/Plane Waves	Microwave
	14 KHz	15 KHz     400 MHz     1 GHz	10 GHz
USC-26	58 dB	100 dB     110+ dB     110+ dB	110+ dB
USC-44	50 dB	100 dB      100 dB        90 dB	63 dB

Click the links below for shielded cabinet images

A shielded enclosure is only as effective as it's access portals. USC research and engineering has developed doors that provide attenuaton characteristics equal to that of the enclosure, and are mechanically and asthetically pleasing. The shielded door manufactured is Type RCM-154, utilizing a brass extrusion mounted on the periphery of the door frame. This extrusion houses two rows of "fingers" which are concealed from accidental damage. The door leaf has brass "knife-edge" extrusion at the perimeter which mates with the figers within the fame when the door is closed. This design results in a damage-free closure seal. with higly efficient prevention of RFI/EMI leakage.

Type RCM-254 "double knife design" utilizes four rows of fingers to improve the magnetic and plane wave shielding.
	RCM-154 Design	RCM-254 Design

Latching Mechanism: USC enclosure doors are equipped with a minimum of a 3-point latching mechanism for tight RFI/EMI-secure closing. Bearing surfaces, rollers and door cams are of case-hardened tool steel designed to provide years of trouble-free operation with no loss of attenuation capapbility due to friction and wear. Doors are extremely esy to operate, requiring less than 20 pounds of force on the handle.
Hinges: Doors incorporate a minimum of three door hinges. They have both readial and thrust bearings to minimize frition and wear on the hinge pins resulting from the weith gof the door. There is an adjustmen in the hinge bothn ithe horizontal and vertical direction.
Low Threshold Door: USC offers the Model RCM-154-FS low threshold door to facilitate the transport of equipment into the enclosure.

Sizes Available: Standard single-personnel-door provides a 3'-0" x 7'-0" clear opening and the double door provides a 6'-0" x 7'-0" clear opening. Similar to the shielded enclosure, the access doors can be custom fabricated in both swing and opening size. Door construction lends itself to various sizes, as large as 18'-0" x 18'-0". The unique latching system allowes either the active or inactive leaf to be easily operated.

Shielded Door Options - Semi-Automatic and Fully Automatic Door Closing Mechanism for High-Traffic Situations:

To ensure proper closure at all times, USC offers an automatic door closign mechanism as an optional accessory. It seals tight each time a person enters or leaves th enclosure and operates at the touch of a button. The mechanism is self-contained, self-limiting and self-closing to ensure repeated posititve sealing properties. It is equipped with a manual override for use in the event of a power failure. The mechanism includes an electromechanical interlock feature for use when two doors operati in tandem in a shielded vestibule.

Door Accessories

• Doors can be equipped with security combination locks, electrical or mechanical cypher locks and key cylinder locks.
• Doors can contain RF honeycomb air vents and RF windows.
• Ferrite Tile - Door and frame assembly designed to accept ferrite tile an anechoic material.
• Vestibules - multiple doors in tandem with electrical interlocks, and visual indicators.
• Ramps - Wooden ramps with aluminium non-skid surface, aligned to clear opening of door.
• Rails - Easily installed lightweight portable rails for transporting equipment into enclosure.
• Door Finishes - Available upon request.

Semi-Automatic Door Closure	Fully Automatic Door Closure	Vestibule Door	Portable Entry Rails

Acoustic and Weather Resistant Doors 

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Acoustic RF Doors - These doors utilize the RCM-154 or RCM-254 door assembly with a clear opening of 36" x 84", utilizing three hinges and a three point latching system. the door leaf and frame have acoustical treatmetns and acoustic membranes. The door assembly has been tested to provide an STC-43 rating, and an RF attenuation of 100 dB to 20 GHz.
RF Weather Resistant Doors - These doors utilize the RCM-154 or RCM-254 door assembly with a clear opening of 36" x 84", utilizing three hingses and a three point latchigns ystem. The door frame is modified to adapt to a container or shelter structure. The door extrusions are environmentally treated and gaskets are employed to attain a weather resitatnt seal. This door assemly meets specification MIL-STD_810-F including drop test, environmental tests, and provides and RF attenuation of 100 dB to 20 GHz.
RF Hatches and RF Access Doors - These hatches employ the RCM-154 or RCM-254 door and frame assemblies. An emergecy style latch is utilized. The RF hatches and RF access doors can be furnished in our standar, acoustic, or weather resistant configurations.

The basic purpose of a shielded enclosure - to attenuate radio frequency and electromagentic interference - is defeated if the doors, air vents, waveguide penetrations, and othe RF accessories do not provide attenuation comparable to that of the enclosure. The following accessories are utilized in USC enclosures and can also be provided as stand alone units.

RF Waveguide Air Vents - USC enclosures are equipped with RF waveguide-type filters. These are RFI/EMI-attenuation air ducts designed to permit maximum airflow for cooling, heating, and ventilation without degrading the shielded efficiency of the enclosure. RFI/EMI attenuation characteristics of these ventilating ducts equals that of the enclosure. Additionally, they can be fabricated in various sizes and configurations to be adapted to the existing shield struture, meeting customer requirements.
Ceiling Mounted Exhaust Fans - These units can be furnished of various sizes and capacity depending on the enclosure configuration.
RF Removable Connector Panels - USC can furnish removable penetration panels of various sizes containg penetrations or connectors such as fiber-optic, BNC, "N", and SMA.
RF HI-HATS - RF hi-hats are used in RF anechoic enclosures. They are equipped with RF waveguides and can be manufactured to meet customer requirements.
RF Waveguide Feedthrus - USC offers a series of waveguide feedthrus to preserve the enclosure shielding integrity to enable sprinkler, sinks, and medical gas lines to penetrate the enclosure. These penetrations are available in copper, brass and steel.
RF Telescoping Sprinkler Heads - USC offers a line of RF shielded telescoping sprinkler heads for applicaions in anechoic chambers.
Lighting - USC can furnish incandescent light fixures. Each fixture contains 2-75 watt lamps encased in a globe. USC also offers a series of RFI/EMI suppressed flourescent light fixtures.
Work Benches - USC can provide copper top work benches designed to be bonded (grounded) to the shielded enclosure. They can be fabricated of various sizes to meet customer requirements.

Power Filters - All electrical service conductors passing into a shilded enclosure require filters to block interfering signals. Model USC-50 series are signle wire and dual line units providing 100 dB of attenuation from 14 KHz to 10 GHz measured in accordance with MIL-STD-220A. All filters are rated at 277 volts L/N maximum, 0-60 Hz. They are also manufactured in 400 Hz version.		Model Amperage USC-50 -2x5 2x5 ampere USC-50 -2x30 2x30 ampere USC-50 -2x60 2x60 ampere USC-50 -1x100 1x100 ampere USC-50 -1x150 1x150 ampere USC-50 -1x225 1x225 ampere
Signal, Telephone, and Data Filters - Signal line filters are available as stand alone dual (2-wire) units or are inserted in shielded cabinets containing multiple filters. These filters are used in telephone, data, fire alarm, ethernet, and security circuitry.