EMC/EMI test chamber includes a main anechoic chamber, a shielded room, data acquisition equipment and measurement system (multi-meter, oscilloscopes, probes, RF power meter, etc…) The optimized EMC test chamber and measurement system will be designed and configured based on experiences over 10 year on satellite system development.
EMC/EMI Test Chamber
EMC/EMI Test chamber related to test facility and equipment will be based on the following descriptions;
- Measurement tolerances.
Unless exceptional requested for a particular measurement, the tolerance shall be as follows:
a. Distance: ±5%
b. Frequency: ±2%
c. Amplitude, measurement receiver: ±2 dB d. Amplitude, measurement system : ±3 dB e. Time (waveforms): ±5%
- Shielded enclosures
To prevent interaction between the EUT(Equipment Under Test) and the outside environment, shielded enclosures are required for testing. These enclosures prevent external environment signals from contaminating emission measurements and susceptibility test signals from interfering with electrical and electronic items in the vicinity of the test facility.
Shielded enclosures shall be provided adequate attenuation, and sufficiently large such that the EUT arrangement requirements and antenna positioning requirements are satisfied.
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- Radio Frequency (RF) absorber material
The RF absorber material (carbon impregnated foam pyramids and so forth) is used for performing electric field radiated emissions or radiated susceptibility testing inside a shielded enclosure to reduce reflections of electromagnetic energy and to improve accuracy and repeatability. The RF absorber is placed above, behind, and on both sides of the EUT, and behind the radiating or receiving antenna. Minimum performance of the material is as follows:
a. 6 dB from 80 MHz - 250 MHz b. 10 dB over 250 MHz
- Ground plane.
The EUT is installed on a ground plane that simulates the actual platform. If the actual installation is unknown or multiple installations are expected, then a metallic ground plane is used. The metallic ground plane is about 2.25 square meters in area with the smaller side no less than 76 centimeters.
- Power source impedance
The impedance of power sources providing input power to the EUT is controlled by Line Impedance Stabilization Networks (LISNs) for measurement procedures unless a particular test method is required. In some case, test will request the special LISNs which are designed in according to the specified power impedance on the satellite platform. In that case, it is not included in this bidding.
EMC/EMI Measurements
The EMC/EMI test chamber and equipment will support the emissions and susceptibility tests. The measurement set-up will be as follows:
- Bandwidths for emission testing
The measurement receiver bandwidths are used for emission testing. These bandwidths are specified at the 6 dB down points for the overall selectivity curve of the receivers.
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- Frequency scanning for susceptibility
For susceptibility measurements, the entire frequency range for each applicable test is scanned. For swept frequency susceptibility testing, frequency scan rates and frequency step sizes of signal sources will not exceed the values. The rates and step sizes are specified in terms of a multiplier of the tuned frequency (fo) of the signal source. Analog scans refer to signal sources which are continuously tuned. Stepped scans refer to signal sources which are sequentially tuned to discrete frequencies. Stepped scans will dwell at each tuned frequency for a minimum of 1 second. Scan rates and step sizes will be decreased when necessary to permit observation of a response.
Overall specification
The EMC/EMI Test chamber will be designed to satisfy the requirements and recommendations stated in space and military standards such as MIL-STD-462 C&D, MSFC, NASA, MIL-STD-1541. Also the dimensions of the EMC/EMI test chamber will be selected to accommodate satellite subsystems or systems in compliance with the measurement procedures such as MIL-STD-462 C&D for testing in the 30 GHz up to 40 GHz frequency range.
Also the EMC/EMI test chamber will be designed for the purpose of protecting the radio frequency environment of the test center against the functional emissions generated by other systems and against any risks of interference from the laboratory’s power generation equipment. Figure 9.18 shows the EMC/EMI test chamber site (for only reference) while Figure 9.19 shows the configuration of the anechoic chamber and the shielded room which will be installed in the assembly, integration, and test center of Customer site.
[[Distribution Limitation, KARI Proprietary Data] This documents is the property of Korea Aerospace Research Institute and shall not be reproduced or distributed without prior authorization. Also, the data contained in this Document, without the permission of KARI, shall not be used or disclosed for any purpose other than TurkSat. The data subject to this restriction is contained on all pages.
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Figure 9.18 EMC/EMI Test Chamber Site (for only reference)
Air Lock Elevator
Amplifier Room
Control Room
Anechoic Chamber
Return duct
Test Hall (4)
Control Air Lock
Equipment Incoming Hall
Equipment Door
21.6 5
5 x 7 m
5 x 7 m 14.4
13.4
15.1
3.4
11 3 4.5
H : 3m
1.5
1.5
4 x 5
2.9 ton
H : 8m
Feed-through Panels
1 1
1
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Figure 9.19 Layout of the EMC/EMI Test Chamber(for only reference)
Overall dimensions of the anechoic chamber are recommended as follows:
a. Length : 15 m (+0.5 m) b. Width : 10 m (+0.5 m) c. Height : 10 m (+0.5 m)
Shielding requirements in shielded rooms (anechoic chamber, control room and amplifier room)
- Attenuation to magnetic field
≥ 70 dB at 14 kHz
≥ 90 dB at 200 kHz - Attenuation to electric field
≥ 120 dB 200 kHz to 50 MHz - Attenuation to plane wave
A m p l i f i e r R o o m
C o n t r o l R o o m
A n e c h o i c C h a m b e r
R e t u r n d u c t 2 1 . 6
13.4
3.4
3 4 . 5
1 . 5
1.5
4 x 5
1 1
1
11 7
1 5 . 1
14.4
[[Distribution Limitation, KARI Proprietary Data] This documents is the property of Korea Aerospace Research Institute and shall not be reproduced or distributed without prior authorization. Also, the data contained in this Document, without the permission of KARI, shall not be used or disclosed for any purpose other than TurkSat. The data subject to this restriction is contained on all pages.
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≥ 120 dB 50 MHz to 1 GHz
≥ 100 dB 1 GHz ~ 40 GHz
Type of tests
The EMC/EMI test chamber will be installed to perform the emissions and susceptibility tests in perfect way as following tests.
- Conducted emission tests in power lead AC/DC, interconnection lines, and bonding strap
- Radiated emission tests on each face of the device under the test - Conducted susceptibility tests
- Radiated susceptibility tests
- Auto compatibility tests (depends on the satellite system) - Electrostatic discharge tests on equipment, and subsystem
Overall description of Measurement System
The measurement system will be installed in the EMC/EMI chamber in customer site. The measurement system will be capable of performing the radiated and conducted emission and susceptibility tests on the satellite units, subsystems and system in compliance with the measurement procedures such as MIL-STD-462 C&D in the range of the frequency 30 Hz up to 40 GHz.
EMI measurement system
EMI measurement system will be located in the anechoic chamber and used to measure the conducted and radiated emission level from the EUT (Electronics under Test) such as satellite or other products of space application. The interference from the measurement equipment will be guaranteed, whether or not operating, the limited specification of at least above 6 dB in accordance with MIL-STD-461 C&D, MIL-STD-462 C&D and MIL-STD-1541. The EMI measurement equipment will classify the following group:
a. instruments for measuring a current, voltage or power and electric field strength
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b. Antennas and probes
c. Automatic control, record and measurement system (limited to frequency domain measurements)
d. Software and hardware (interface) for automatic control of the measurement system
e. Accessories
EMS Measurement system
EMS measurement system will perform the conducted and radiated susceptibility test, and electrostatic discharge (ESD) test of EUT such as satellite or other products of space application. The EMS measurement equipment classifies the followings group:
a. Signal generators b. Power Amplifiers
c. Current sensing probes and antennas d. Software and interface hardware e. Pulse generators
f. Electrostatic discharge test instrument g. Accessories
[[Distribution Limitation, KARI Proprietary Data] This documents is the property of Korea Aerospace Research Institute and shall not be reproduced or distributed without prior authorization. Also, the data contained in this Document, without the permission of KARI, shall not be used or disclosed for any purpose other than TurkSat. The data subject to this restriction is contained on all pages.
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