Manufactured by Siepel in France, these absorbers are the result of research focusing on the optimization of the equipment geometry and composition.

They comply with the following characteristics and standards:

• Reflectivity performance: contractual guarantee
• Technology: polyurethane foam impregnated with carbon
• Power handling: from 2 kW/m² to 15 kW/m²
• Temperature resistance: from – 65°C to +200°C
• Compliance with fire resistance standards and recommendations: ISO 11925-2 Euroclass E, NRL 8093 – tests 1, 2 & 3, DIN 4102 – B2
• Use in clean rooms: ISO class 4 in accordance with ISO 14644-1
• Respect for environmental standards: raw materials compliant with the REACH & RoHS Directives
• Ageing: excellent service life (> 20 years)
• Made in France: control of the production line and available stock

LIV coating: a unique coating developed by Siepel; This rubberized coating provides both flexibility, strength and chambers customization. It represents an alternative to the white caps which affect performances at high frequencies.

Discover our wide range of electromagnetic absorbers designed and manufactured by Siepel to comply with standardised Electromagnetic Compatibility (EMC) tests, such as:

• Automotive: CISPR25, ISO 11452
• Aeronautics & space: RTCA/DO160x
• Industry: CISPR/EN 14 -16 -22, IEC/EN 61000-4-3
• Defence: MIL-STD-461, STANAG (incl. AECTP 500)

The following models can be used in new installations, for refurbishment or upgrading of chambers. Use our expertise to get the right absorbers for your specific chamber design and / or installation.

• SEA-PM – Broadband pyramidal absorbers: for the lining of EMC anechoic chambers for automotive, aerospace and defence equipment
• SEA- TM - Broadband truncated absorbers: with truncated tips, for an optimised space inside anechoic chambers dedicated to defence and aeronautics.
• SEA-HY - Hybrid pyramidal absorbers glued on ferrites for commercial and industrial testing (CISPR16-1-4), automotive (CISPR25), defence (MIL-STD-461) and aerospace (DO160).
• SEA HYT - Hybrid truncated absorbers with reduced tips, for an optimised space inside anechoic chambers for industrial and defence EMC standards
• SEA-FE – Ferrite absorbers: They enable to meet the performances requested by EMI and EMS testing up to 1 GHz. To extend the performances up to 18 GHz (or more), hybrid foam absorbers (SEA-HY & HYT) must be added on top of the ferrites.

For microwave testing, we have developed a whole range of absorbers tailored to the tests to be carried out.

The test sites having an impact on the reliability of your measurements, it is necessary to validate them at the end of the installation.

Siepel measurement laboratory is accredited NF EN ISO/ IEC 17025 by the French Committee for Accreditation (COFRAC) and offers many accredited measurements of anechoic chambers:

• Shielding effectiveness (10 kHz - 40 GHz) according to EN-50147-1
• Normalised site attenuation (30 MHz - 1 GHz) according to CISPR-16.1.4
• Site VSWR (1 GHz - 18 GHz) according to CISPR-16.1.4
• Field uniformity (80 MHz - 6 GHz) according to EN-61000-4-3
• ALSE (150 kHz - 1 GHz) according to CISPR25

Siepel measurement laboratory is organised as an independant entity to ensure impartiality on results.

Your anechoic chamber must be calibrated by a test laboratory to verify its actual level of performance according to the standards.

It is also recommended to perform regular recalibration, even if the facility has not undergone major structural changes

For 39 years, Siepel has been designing, manufacturing and installing mode stirring reverberation chambers (RVCs)

RVCs are dedicated to emission and electromagnetic immunity measurements at high field levels

They are used for military, aerospace and automotive applications in response to MIL STD, DO, EN and current automotive standards on a wide range of frequencies (from a few MHz to 18/40 GHz).

This test mean has the ability to produce statistically isotropic and uniform strong CW and pulse fields (several hundreds to thousands of V/m) with optimised input power (generation).

The choice of reverberation chamber will be a trade-off between three main criteria: .

• The Equipment Under Test (EUT) dimensions
• Frequency range of operation
• Power level available and field strength required

Siepel MSRCs series is called EOLE. Current standard models of reverberation chambers are characterized by their Lowest Usable Frequency (LUF) : from EOLE 80 to EOLE 1000

Depending on the expected performances and the frequency range of operation, the internal walls of a RVC can be made of steel or aluminum.

Based on its know-how, extensive research and modelling as well as feedback, Siepel is in the only supplier capable of modelling, manufacturing the shielded room and the stirrer as well as committing on minimum guaranteed field levels.

Product development being in Siepel's DNA, several models of shielded and anechoic cabinets have been designed since 1986.

Mostly used during R&D phasis or industrial process, the proposed range is designed to withstand intensive use.

Based on our industrial know-how, we propose welded steel structures or modular shielding (as used for the Faraday cages) and include many fittings such as: chassis frame, shielded window, shielded gloves, EUT support, ...

Siepel, as a company with the overall expertise to design, manufacture, install, measure and maintain EMC anechoic chambers, offers pre-determined models compliant with the international standards:

• ANSI C63.4 CISPR 16-1-4: Radio disturbance characteristics (CISPR 13, CISPR 14, CISPR 15, CISPR 22, CISPR 32)
• IEC / EN 61000-4-3 Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test.
• CISPR 25: Vehicles, boats and internal combustion engines - Radio disturbance characteristics for the protection of on-board receivers.
• ISO11452-x: Road vehicles - Component test methods for electrical disturbances.
• RTCA DO160-xx: Environmental conditions and test procedure for Airborne equipment’s.
• MIL STD 461-x: Defence Standard - Requirements for the control of electromagnetic interference characteristics of subsystems and equipment

Based on following standard models, any chambers can be customized by our in-house technical department to match building or project constraints:

For vehicle components and sybsystems measures at 1m -> Chronos 1F

For aeronautic, spacecraft and defence devices measures at 1m -> Ares 1P or 1F

For industrial, residential and commercial products pre-compliant measurements

-> Hera 1F for measures at 1m (semi-anechoic chambers)

-> Hera 3P or 3F for measures at 3m (semi-anechoic chambers)

For industrial, residential and commercial products full-compliant measurements

-> Hestia 3F and Hermes 3 for measures at 3m (semi-anechoic chambers)

-> Hermes 5 or 10 for measures at 5m or 10m (semi-anechoic chambers)

-> Athena 3 for 3m measures according to CISPR32 & ANSI C 63-10 for wireless devices (full anechoic chambers)

The shielding and its pyramidal absorbers are manufactured by Siepel.

Our strength: The design of the structure is optimised for maximum performances, in minimum space which implies cost-saving.