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Overview of EMC Testing

Martin Foley

Commercial Manager – Industry EMC

TÜV Product Service Ltd

EMC for all reasons

• Overview of EMC

• EMC Test Facilities

• Different tests for different markets

• Routes to Compliance

• How do you save money?

• Price Drivers

• Benefits of using TÜV Product Service

Contents

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What is EMC?

EMC – Electromagnetic Compatibility

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The problems of EMC

• interference with Broadcast Receiver reception

• interference from radio transmitters

• interference from transients

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Test Overview

Conducted

LF/ RF immunity

Surges /

PSU

Conditioning

Transients/ Lightning

Conducted

AF/RF emissions

Surges

Transients

Conducted

LF/RF immunity

Voltage dips

& interrupts

Mains harmonics

& flicker

Radiated

HF/RF

immunity

Radiated

HF/RF

emissions

I/O Power

EUT

ESD

NB other tests may apply, e.g. magnetic field emissions or

immunity, depending on the equipment or application

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EMC Test Capability

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EMC Testing

Test Documentation Construction & Review

Validation of customers requirements.

Readiness for Test Reviews covering

Logistics of Test

Application of Test

Rationalisation of Test Programmes

Testing & Assistance with EMC issues

Reporting (10 day turnaround)

Certification (Bearley Activities Only)

TEMPEST Testing (TEMPEST Logo)

Test Documentation Construction & Review

Establishing customers requirements and rationalisation of the work program

Testing

Reporting (10 day turnaround)

In-Situ Testing for the above

Surveys, utilising clients capacity, trials, large equipments which cannot be brought into a Test House Environment.

Consultancy to aid clients with solutions to their EMC issues.

Scope

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EMC Test Capability - Continued

Conducted Emissions testing: 20Hz – 400MHz

Radiated Emissions Testing: 14kHz – 40GHz

Conducted Susceptibility: 20Hz – 400MHz (AF & BCI)

Magnetic Susceptibility: 20Hz – 150kHz

Radiated Susceptibility: 10kHz – 40GHz (with 18- 40GHz amps

hired from Astrium). Levels up to 200V/m CW and 600V/m

minimum pulsed.

Power Supply Conditioning: New equipment to meet the

Airbus requirements up to 800Hz with DO160E software being

developed as an add on.

Transient & Lightning: Elgal for Defence requirements, EMC

Partner system for all indirect Civil Aerospace.

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Octagon House:

4 x Screened Enclosures

1 x Lightning Lab & 1 x Prep Area

Bearley:

1 OATS

1 Screened Enclosure

Various small chambers & Labs

Facilities

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Why EMC is important?

• to meet legal requirements

(e.g. EMC Directive)

• to meet voluntary schemes

• to meet a contractual

obligation (e.g. DEF STAN

etc.)

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Aerospace

Civil Aerospace - Airbus, Boeing (RTCA DO-160)

JSF, Eurofighter for Military (Mil Std, EFA)

Defence

Air (as above)

Land (Vehicles, Man Portable Equipments, Security systems, etc)

Ships (From submarines, in-situ, to systems at the test facility)

Industrial

Rail, Automotive (Car products, Motorcycles, Products for Rail as well as whole vehicles trackside)

Commercial (Showers, Broadcast Receivers (audio/visual), Basestations etc)

Markets AddressedMarkets Addressed

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Different tests for different markets

Military, aerospace and

automotive:

• RF field swept or stepped

– from 14kHz to 40GHz

– modulation EUT-dependent

– field set by local monitoring, no

uniformity specification

• specific test setup on

ground plane

• levels from 1V/m to

56000V/m (TÜV limited)

Commercial:

• RF field swept or stepped– from 80MHz to 2.7GHz (possibly up to

6GHz)

– amplitude modulated 80%, 1kHz

– field set by substitution method

– field uniformity at EUT, +6 -0dB

• each face of EUT subjected to

vertical and horizontal

polarizations

• levels from 1V/m to 10V/m and

above

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Different tests for different markets

Military -

• There are two main set ups in a screened enclosure for military & aerospace equipment

depending on how it will be installed in its intended environment.

– On a ground plane.

– On a mannequin or non conductive ground plane.

• UK standards converging with NATO and US.

• Increasing immunity levels due to higher power pulsed transmitters.

• Increasing lightning levels due to more composites in aircraft.

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Different tests for different markets

Civil -

• We are seeing a growing trend for CE marking to be applied to military equipment

broadening the scope of equipment we need to address.

• Test levels are increasing specially in safety critical environments i.e. Rail.

• The standards are changing at almost a daily basis with general emissions standards

converging to American standards.

• For many large items limited to testing on-site.

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Routes to Compliance

•Accreditation covering testing in our permanent laboratory and also SMT scheme.

•Manufacturer’s test reports can be used to obtain EMC Attestations for CE marking, CB Certificates via the CB Scheme.

•Initial audit of the test laboratory in accordance with ISO 17025.

•Support and training.

•Issue of required attestations and / or CB Certificates.

•A combination of spot check testing and annual laboratory assessments ensure the continued smooth operation of the SMT partnership.

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How do you save money?

• Design Review, Risk Assessments and GAP Analysis (reduce the amount of

tests).

• Prepare a structured Test Plan.

• Be Test House savvy.

– Cable lengths & terminations

– Power supplies

– Functional test equipment

– On site support

• Pre-compliance – gain confidence before full qualification testing or going into

production.

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Price Drivers

What will drive the price of your EMC test regime?

• Market access – Where do you want to sell it?

• Specification requirements – How and where will it be used?

• Number of modes of operation?

• Dwell time of EUT – Is it continuous operation?

• Number of ports or power / control & signal cables?

• Size of product (Can it be done in house or at the clients site?)

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Benefits of using TÜV Product Service

• The right people

– With over 50 years’ experience TÜV Product Service has a

core team of global experts well versed in their fields of

testing and certification of products to worldwide standards.

• The right time

– With over 11 chambers and other facilities, flexibility to

meet your lead-times regardless of length of project

– Flexible working covering shifts and weekends

• The right solution

– Complementary services such as One-stop testing and

consultancy or certification

– Flexible Schedules (always the first to achieve

accreditation to address new standards)

– At our site or we will come to you

– Industry leading report turnaround – 48 hours on demand

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QUESTIONS!