EMC- Military and Aerospace Radiated Immunity Concerns

EMC- Military and Aerospace
Radiated Immunity Concerns
Current Events: August 2010
Boxborough – 19 August 2010
Michael Koffink
Operations Manager, EMC
www.intertek.com
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Military/Aerospace EMC
The gap between the test requirements of commercial-off-the shelf
equipment (COTS) and military/aerospace requirements is not an easy
bridge to cross. This is true in regards to EMC and other environmental
test requirements.
This is mainly because of the severe environments these devices and
systems may be exposed to. Besides extreme weather conditions,
temperatures, physical shock and vibration, extreme EMC environment is
considered a major threat to performance of equipment.
For this reason EMC testing requirements are considered more stringent
in the military/aerospace world than is found in the commercial world often
posing difficulties for manufacturers wanting to offer their products in both
arenas
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Some Differences Between Commercial and
Military/Aerospace Test Requirements
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Radiated Test Distance- Commercial 3m or 10m common.
Military/Aerospace is 1m.
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Radiated Emissions Configuration- Commercial use of a
turntable and adjustable antenna heights. Military/Aerospace
uses fixed position methodology.
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Lower and Higher frequency ranges covered by Mil/Aerospace.
Much higher Immunity field strengths- Commercial 3V/m and
10v/m is typical. Mil/Aerospace 200V/m and up is typical on ship
and airborne equipment
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Standards
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MIL-STD-188-124Grounding, Bonding and Shielding for Common Long Haul/Tactical Communications
Systems Including Ground Based Communication-Electronics Facilities and Equipment
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MIL-STD-188-125-1High-Altitude Electromagnetic Pulse (HEMP) Protection For Ground-Based C41
Facilities Performing Critical, Time-Urgent Missions - Part 1 - Fixed Facilities
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MIL-STD-188-125-2High-Altitude Electromagnetic Pulse (HEMP) Protection For Ground-Based C4I
Facilities Performing Critical, Time-Urgent Missions - Part 2 - Transportable Systems
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MIL-STD-331CEnvironmental and Performance Tests for Fuse and Fuse Components
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MIL-STD-464A Electromagnetic Environmental Effects – Requirements for Systems
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MIL-STD-1377Measurement of effectiveness of cable, connector, and weapons enclosure shielding and
filters in precluding Hazards of electromagnetic radiation to ordnance
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DOD-STD-1399-70-1Interface Standard for Shipboard Systems – Section 070 – Part 1 – DC Magnetic Field
Environment
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MIL-STD-1399-300BInterface Standard for Shipboard Systems – Section 300 - Electric Power, Alternating
Current
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MIL-STD-1541AElectromagnetic Compatibility Requirements for Space Systems
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MIL-STD-2169BHigh Altitude Electromagnetic Pulse (HEMP) Environment.
MIL-STD-449DMeasurement of Radio Frequency Spectrum Characteristics
MIL-STD-461FRequirements for the Control of Electromagnetic Interference Characteristics of Subsystems
and Equipment
MIL-STD-704FAircraft electric Power Characteristics
MIL-STD-1310HShipboard Bonding, Grounding, and other Techniques for Electromagnetic Compatibility,
Electromagnetic Pulse (EMP) Mitigation, and Safety
MIL-STD-1542BElectromagnetic Compatibility and Grounding Requirements for Space System Facilities
MIL-STD-1576Electroexplosive Subsystem Safety Requirements and Test Methods for Space Systems
MIL-STD-1605AProcedures for Conducting a Shipboard Electromagnetic Interference (EMI) Survey
(Surface Ship)
DO-160 F Environmental Conditions and Test Procedures for Airborne Equipment
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Most Common Standards in Regards to EMC
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MIL-STD-461FRequirements for the Control of
Electromagnetic Interference Characteristics of Subsystems
and Equipment
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MIL-STD-464A Electromagnetic Environmental Effects –
Requirements for Systems
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DO-160 F Environmental Conditions and Test
Procedures for Airborne Equipment Sections
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Mil-Std 461 F
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Most widely used standard for US Military EMC assessment
Specific test requirements are grouped according to test type ”RS”Radiated Susceptibility “RE- Radiated Emissions “CS” Conducted
Susceptibility “CE” Conducted Emissions
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Test applicability based on which platform the equipment will be used
on. ie ground, ship, airborne
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ESD and Lightning testing is not covered under current and past
versions however it is being considered for future version “G”
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RTCA DO-160F
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DO 160 is the most widely used standard to specify test
conditions for the design of avionics electronic hardware in
airborne systems.
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Large document that covers all test requirements not just EMC.
Test types broken out by section.
Includes requirements for lightning. Both near effect and direct.
ESD requirments
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Mil-STD 461 Radiated Susceptibility
RS 101 – Magnetic Field 30 Hz to 100KHz
RS 103- Electric Field 2MHz to 40GHz
RS 105- Transient Electromagnetic Field
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Mil-Std 461 RS 103
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ALSE and Reverberation chambers methods allowed
2MHz to 40GHz(18 to40GHz optional)
200V/m for aircraft and ships above deck
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DO 160 Section 20 Radiated Susceptibility
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ALSE and Reverberation chambers methods allowed
10KHz to 400MHz coupled by injection probe “CS”
100MHz to 18 GHz radiated by antenna
Field strength requirements guided by category
Categories S,T,W,Y rang 1 to 200V/m
HIRF categories high field strength both CW and pulse required
Category G up to 3000 V/m pulsed
Category L up to 7200 V/m pulsed
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Tips
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Understand the environment the product maybe used , what are
the risks? Standards can be tailored to fit application.
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Try not to “just get by”
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Large systems may need to be illuminated in multiple spots or
may require reverb method
Expect to ruggedize your product in terms of shielding and
overall design.
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EMC2GR Initiative
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Demands of our clients and the local aerospace market in the
Grand Rapids MI area has allowed Intertek the opportunity to grow
and add EMC capabilities to our Kentwood MI facility!
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Coming soon September 2010
Mil/Aerospace, Commercial, Automotive
4 EMC chambers, 2 Mils std, 1 full ANSI height 3M, 1 Reverb
Level 5 DO 160 Lightning induced transients
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Questions?
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