TECHNICAL SPECIFICATION FOR

EMI/EMC ANECHOIC CHAMBER+AMPLIFIER ROOM+ CONTROL ROOM

Sl.No.. / Parameters / Requirements / To be completed by the suppliers
Compliance (Yes / No ) / Remarks / Deviation if any
1 / Scope of work / Design, supply, Installation and commissioning of Anechoic Chamber) 3m test distance and 2m diameter 2m H test volume compliant to the following specifications for Immunity: IEC 61000-4-3, MIL-STD-461F and Emission: CISPR 11, 22, CISPR 16-1-4, MIL-STD-461F, Shielded Amplifier room, Shielded control room and validation by an internationally accredited external third party agency with ISO 17025 certification. The sole responsibility lies with the vendor who shall carry out the above. The third party should make arrangements in bringing the test and measurement equipment required for the evaluation of shielding effectiveness of RF shielded chamber, the NSA, the SVSWR, and the field uniformity. The third party agency shall use their own equipment and antennas which shall have valid calibration from an accredited lab. The agency details shall be provided and cost towards the same shall be borne by the supplier. A test procedure shall be proposed and agreed by ITI Ltd. test points & test methodology prior to start.
Site Acceptance Test, followed by the Chamber evaluation and training on maintenance shall be provided by the supplier.
The country of origin of all critical material with the technical data sheet should be submitted along with the technical proposal.
The chamber is to be commissioned at existing building within the ITI Ltd. Bangalore campus. It is responsibility of the supplier of the Anechoic Chamber to integrate with the Radiated Emission system.
Installation / commissioning, inspection and training are the sole responsibility of the supplier Including any civil works for making the ducts and procuring all necessary tools, machinery and manpower / labour related for installation work.
The Certificate of Conformance / Compliance (CoC) should be produced from the OEMs for the items / materials used in the construction of Chamber (wherever applicable).
Chamber shielding effectiveness performance shall be guaranteed up to 40 GHz.
The chamber and the shielded rooms should be tested according to MIL-STD 285 and IEEE 299 or EN 50147-1 latest edition by an internationally accredited external third party agency with ISO 17025 certification. The quantity of points and frequencies between 10KHZ and 40 GHz has to be clearly indicated in the proposal.
Minimum 10 to 15 critical test positions / points (i.e., near doors, penetration panels including the honey comb vents and corners or the chamber) shall be identified in consultation with ITI Ltd. before performing the SE test, the NSA +/- 3,5dB from 30 MHz till 1 GHz CISPR 16-1-4 latest edition on quiet zone 2m diameter and 2m in height at 3m test distance is requested, as well as SVSWR 5.5dB max at 3m test distance on the same test volume according to CISPR 16-1-4 from 1GHz till 18 GHz at 3m test distance and FU with 16 points +6dB max from 30 MHz till 18GHz at 3m test distance according to EN 61000-4-3 have to be guaranteed
The vendor shall demonstrate the performance and compliance of the supplied test facility after integration of the test instrumentation systems.
Before starting the installation of RF chamber works, the representative (design engineer) of the supplier should visit the site and give the clearance for commencement of the installation works. Any additional requirements/ recommendations/suggestions shall be brought to the notice of the user well in advance.
The standard Quality of material should be used in the construction of the chamber. Use of any local and nonstandard / substandard material will not be accepted.
One set (hard copy) of structural design, layout diagrams, necessary conformance certificates and maintenance document shall be provided by the supplier.
The supplier should give his own company’s profile with full details of business and similar installations carried out and also the business details and profiles OEM’s where from the materials have been procured.
All the details shall be clearly mentioned by the supplier in the technical proposal / offer and also any other special requirements needed.
The supplier should provide spare parts for where it is needed.
The supplier should provide 2 year standard warranty against chamber shielding effectiveness, corrosion and RF absorber performance.
During warranty, periodic maintenance shall be carried out by the supplier/local representatives as per the procedures laid down in the document.
Post warranty maintenance support shall be available from the supplier or his local representatives for a period of minimum 10 years.
All the supporting technical documents / manuals /warranty certificates /certificate of compliance/ critical tool shall be supplied.
2 / Basic Configuration / 1. Anechoic Chamber:
Suitable to test EUT size of min 1 m3 for both Radiated Emission and Radiated Immunity tests as per the standards above.
Size: 8.3 x 4.6 x 5.1m (LxWxH)) (Minimum) Internal clearance with absorbers
2. Shielded Amplifier Room:
Suitable to house the Amplifiers required for meeting Radiated immunity levels.
Size: 3.4x3.9x2.9m (LxWxH) min internal clear with raised floor elevated 150 mm min height.
3. Shielded Control Room:
Suitable to accommodate all the test equipment’s along with the racks.
Size: 4.5x3x3m (LxWxH) min internal clear with elevated floor 300 mm height.
3 / Purpose of use / To perform full compliance Radiated Emission 10 KHz to 18 GHz) and Radiated immunity (2 MHz to 40 GHz) testing as per the standards specified at Sl.No.1
4 / Design/Design Review / Suppliers shall include in the proposal, drawings/information detailing the following:
1. A plan and elevation drawing of the chamber setup with the Amplifier room and Control room. This should include the CCTV, fire detection system, typical location of device/equipment under test and antenna locations, filters (both power line and signals), access panels and other relevant details.
2. Lighting and air-condition vents connectivity details for chamber, Amplifier room and Control room.
3. The equipment layout together with the furniture/bench layout at the Amplifier room and Control room.
4. Locations of utility sockets (power and data).
5. Details for site preparation such as:
a) Civil drawings/layout for building for Housing chamber, Amplifier room and Control room.
b) Flatness of the floor of building (to be done by the supplier).
c) Specific floor load points/load for the chamber and any other relevant information.
d) Space clearance between walls and ceiling of parent building in relation to the external perimeter of the chamber.
e) Power to the facility will be provided by ITI. in the building till the power panel on chamber, however the power panel will be provided by the supplier.
f) Any other necessary requirements that will be critical to achieve proper facilitation of the installation and operations of the chamber, Amplifier room and Control room.
6. The earthing design requirements including the chemical grounding shall be provided by the supplier.
Preliminary design review:-
The preliminary design shall consist of the layout and the utility requirement. After preliminary design, 1 set of blueprint drawing in AutoCAD and PDF format must be sent to ITI Ltd., Bangalore after the contract comes into force. Preliminary design is subject to the approval of ITI. Supplier should not start the final design before receiving this approval.
Final design review:-
After final design, 1 set of blueprint drawing in AutoCAD and PDF format must be sent to ITI and approved by ITI Ltd. Final design will consist of full details of all components for the chamber, shielded rooms and system, to include layout plan views for installation planning. All details are to be dimensioned fully and shown in three views.
5 / Test Volume Size & Weight of Equipment Under Test / The chamber shall cater for Radiated Emission and Radiated Immunity testing as per standards and for a quiet zone of 2m diameter and 2m height The chamber shall cater for testing EUT size up to 1 m3 minimum and weight up to 2000Kgs.
6 / Operating frequency range / Frequency of operation: as per standards from 10 KHz to 40 GHz.
7 / Construction
7.1 / Chamber Construction / Steel structure:
The shielded chambers for Anechoic Chamber, Amplifier room and control room shall be Modular/PAN type and self-supporting (independent from host building).
The whole system should be supported by freestanding steel structural frame. The entire chamber shall easily be dismantled and reinstalled. The panels shall be made of hot galvanized steel sheet with required thickness and non-corrosive.
The materials used in the construction shall be of high quality meeting EMC applications as per relevant standards.
Chamber structural design should meet the seismic safety of level 6.0 on Richter scale
The chamber shall be installed on the floor with required ground plane and necessary cable ducting on the floor and the galvanized steel panels capable of bearing a load of 2000 Kgs/m2. The homogeneity should be maintained between ground plane and steel panels.
The necessary leveling should be maintained i.e., <3mm per 3 meters. ( ITI will carry out required civil works for leveling)
Anti-moisture mat should be provided under the shielded floor and columns to avoid ingress of moisture / against rising humidity and electrical insulation.
The floor inside the chamber should be made of an elevated floor (at least 300mm) in order to have cables running under it. And covered by a perfect ground plane minimum thickness 2mm made of high quality galvanized steel. Aligned with the main door threshold. This will guarantee that this will never have any ESD trouble.
Exterior finish materials: fully galvanized metal shielding duly painted.
Single Point Grounding: Complete structure will be isolated from the building floor (i.e to maintain the single point grounding configuration).
Grounding scheme for best performance shall be provided.
Shielding systems:
Modular/PAN 2mm thickness
Shield: Sufficient thickness of the shield and should be non-corrosive.
Frequency range : 10 KHz-40 GHz
Standard: Shall fully comply with latest versions of the standards mentioned at Sl.No.1.
Before evaluation of H and E field the leakage test shall be performed to identify any leakages in the chamber.
Shielding Effectiveness Performance:
Magnetic field:
at 10 KHz: 60dB or higher
100 KHz: 80dB or higher
1000 KHz: 100dB or higher
Electric field:
at 100 KHz: 100dB or higher
1 MHz: 100dB or higher
10 MHz: 100dB or higher
Plane wave:
at 100 MHz: 100dB or higher
400 MHz: 100dB or higher
1 GHz: 100dB or higher
Micro wave:
at 10 GHz: 100dB or higher
18 GHz: 80dB or higher
40 GHz: 80dB or higher
The certificate of conformance/Compliance should be produced from all OEMs for the items/materials used in the construction of the chamber.
7.2 / Floor / Tiles raised floor: Height of the raised floor of the chamber will be minimum 0.3 m in order to integrate running metal cable ducts.
The raised floor must accept the loads as described below, Inside the minimum load capability Anechoic chamber 2000 kg/m2 Mi
Minimum load capability from door to test table: 3000 kg/ m²
The raised floor must be corrosive protected. All structure of the raised floor electro zinc protected.
The raised floor in the chamber is covered by a ground plane made of same materials as of the shielded panels for homogeneity.
The ground plane shall be completed with appropriate floor lining inside chamber. (Suitable grade for EMC applications shall be used).
Anti-moisture mat will be provided under the shielded floor to avoid ingress of moisture/against raising humidity.
The floor connection panels are perfectly integrated in the raised floor/ground plane of the chamber.
8 / RF Absorbers
8.1 / Type / Area to be covered: The RF absorbers should cover all the four sides of Walls and ceiling of the main chamber. The lining design will comply with the standards requirements. The lining should be done with sufficient absorbers for guaranteeing the performances.
Design: The absorbers shall be state-of-the art technology to achieve best performance for EMC applications. Absorbers should be any of ferrite/ Thin film nanotechnology / Polysterene/ polyurethane foam impregnated with carbon light weight smaller size.
Absorbers shall be from a reputed manufacturer.
Supplier shall provide qualification test report data demonstrating that the absorber complies with the entire requirement.
Shape: Absorbers shall be pyramidal shaped absorber designed for use in EMC test chambers for best performance.
Absorbers should be humidity proof and should not generate any dust and should meet ISO 14644-1 clean room or higher standard or equivalent certificates to be produced.
Absorbers are preferred light color like cream, light yello,blue etc however If Absorbers are blue or black color then they shall be equipped with RF transparent non combustible white end caps for light reflections and shall be provided on walls & ceiling, which shall improve the illumination levels.
Absorbers should be glued wherever required, it should be fixed via screw or hook system for easy dismantling for maintenance purpose. Sufficient number of spare absorbers shall be provided for future replacement.
8.2 / Reflectivity & Absorption / The absorbers should cover complete range of frequency from 30 MHz (commercial tests EMI and EMC from 30 MHz till 18GHz ) for commercial test and till 40 GHz for MIL