The SEMS was designed to meet the growing test requirements of shielding effectiveness for shielded environments in hospitals, EMI-EMC chambers, military and civil shelters for telecommunications.
The SEMS allows fast, automatic and precise measures, in order to determinate the reduction value of the magnetic and the electric field in shielded environments.
Shielded and anechoic environment for EMI/EMC testing
Shielded environment with high electromagnetic protection for civil and military application (shelter)
Measurement
EXAMPLE OF SETUP. TRADITIONAL SYSTEM
EXAMPLE OF SETUP: SEMS SYSTEM
CONNECTION
Coaxial cables to connect transmitting and receiving antennas
CONNECTION
The antennas of the SEMS system are directly connected to the TX and RX units without any cable
POWER SUPPLY
Plug in power supplies required to supply power to the instrumental chain of the signal generator/spectrum analyzer
POWER SUPPLY
Plug in power supplies required to supply power to the instrumental chain of the signal generator/spectrum analyzer
DYNAMIC
External amplifier to increase the signal strength and, consequently, the measurement's dynamic
DYNAMIC
The TX unit of the SEMS system has got a power amplifier covering the whole range up to 300 MHz
CONNECTION TO THE PC A PC
Is required for the automation of the measurement test and the subsequent data storage
CONNECTION TO THE PC
The SEMS system has an internal CPU that manages independently all the functions of calibration, zero setting and measurement with the related storing. Data can be downloaded through a PC via wireless connection
OPERATORS
Two operators are required to perform the measure
OPERATORS
Only one operator is required because the system synchronizes itself via wireless
SEMS measurement system is made of a TX transmitting unit and a RX receiving unit.
They both use a pair of antennas to measure respectively the attenuation of the magnetic and the electric field. TX and RX cover the whole frequency range from 10 kHz to 300 MHz.The measurement range being tested is determined by the antenna.In the standard configuration the SEMS is equipped with L-1 loop antennas for magnetic fields from 2 to 128 MHz and B-1 biconical antennas for electric fields from 60 to 300 MHz.
Alternatively, two loops for the 10 kHz to 4 MHz coverage, two rod antennas for the electric field (1 MHz to 128 MHz coverage) and two D-2 dipole antennas for the electric field (40 MHz to 300 MHz coverage) can be supplied.
Unlike traditional systems, which measure the shielding effectiveness only at a few frequency points, the SEMS performs the complete test continuously and on the whole frequency range.
A further innovation and development, compared to traditional test systems, is the synchronization of the TX and RX units. The two units communicate with each other thanks to a wireless technology, which is very useful to automate, speed up the test and minimize any error.
Operating Principle
SEMS measures the shielding effectiveness of a shielded environment, that is the attenuation of the electric and magnetic field that such environment causes. The operating principle is simple:
FIRST PHASE OR “ZERO SETTING”
The TX transmitting unit generates a RF signal, which is radiated through the antenna.
The RX receiver is positioned at a predetermined distance, receives the signal via similar antenna and measures its level in dBm.
SECOND PHASE “MEASUREMENT”
The TX transmitting unit generates a RF signal, which is radiated through the antenna.
The RX receiver is positioned at a predetermined distance, receives the signal via similar antenna and measures its level in dBm.
Calibration
The SEMS system, while not taking measurements in absolute values, requires a periodic check of its linearity.
The Cal-Kit meets this requirement. It is supplied with Accredited Calibration. The calibration procedure can be recalled from the Cal menu. By selecting CalK, the display will show the correct execution step by step. The following pictures show the set-up to be used.
Packing/Shipping
The SEMS and all accessories ordered are placed in a rigid suitcase and then packed for transport
Tecnichal Specification
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Company Introduction
MPB provides solutions for EMF / EMC / RF testing applications, through R&D, design, production, sale and rental of high technology electronic devices, training courses and consulting. In the field since 1998, MPB has acquired a know-how to be spent on any type of need in the field of reference. Our R&D department works every day to develop new ideas, continously pursuing new solutions for the telecommunications world and for signal measurements in EMC, EMI, EMF. The MPB instrumentation is designed, manufactured and calibrated at our laboratories, equipped with ISO 14025 calibrated test equipment as well as suitable test and calibration environments such as anechoic chamber, TEM and GTEM cells, Helmoltz coils overing the range DC-40 GHz The choice of a customer-oriented business model and ever-changing quality has helped make our company innovative and reliable over the years.
Our Services
Calibrationstandard and accredited
Calibration is the act of checking the functioning an electronic instrument to verify its features according to the manufacturer's original technical specifications. To do so we make a comparison of measures with a reference instrument defined sample. In order to do that we compare measures obtained with a sample instrument. If during the
calibration phase the equipment does not show its original specifics, then it is necessary to repair it. This phase is called calibration. The certificate is the statement that the instrument is compliant with the manufacturer's specifics. Repair MPB can repair a wide range of electronic equipment: Radio frequency, Microwave and testing systems EMC. All our electronic equipment's repairs are performed with new and original spare parts. After the repair the measuring equipment is subject at least to 24 hours test cycles. The documentation available for our laboratory and the know-how gained in many years of activity, give our specialized technicians the opportunity to perform repairs also with obsolete instrumentation, where finding spare parts is very difficult. Design MPB has consolidated through the years his know-how in the area of electromagnetic fields, being therefore able to develop a R & D department. In order to reach the new goal, the company has invested in a lab equipment and in a highly quantified staff. Our lab is fully equipped with high quality precision instruments, such as the TEM cell, the GTEM cell and an anechoic chamber, which allows to develop and to test solutions up to 40 GHz.
