Electromagnetic Compatibility (EMC) Resources
Electromagnetic compatibility (EMC) standards ensure that systems function properly in their intended electromagnetic environment and are not a source of noise pollution to that electromagnetic environment. Harsh environments require iCoupler® digital isolators to be immune to disruption and parts are often tested against levels of electrostatic discharge (ESD), electrical fast transients (EFT), surge, fault tolerance, and direct power injection (DPI).
Additionally, digital isolators must not negatively affect the performance of other electronic systems and networks, which requires proper design techniques to limit radiated emissions (RE) and pass electromagnetic interference (EMI) standard limits.
The best EMC design practices occur at the start of the design. Either as a component or as part of a larger system-level solution, EMC compliance must be met. Scroll down to explore ways to improve your EMC results and simplify your certification process with our array of EMC Resources. Mitigate now!
Featured Electromagnetic Compatibility Content
Got EMI? Fix It with the Latest ADI isoPower + Isolated Data
See how the next generation of reinforced integrated 4-channel data + isolated DC-DC power converters set a new benchmark for low Class B radiated emissions.
Passing the Radiated Emissions Test: How to Eliminate Complex EMI Mitigation Techniques for Compact and Cost-Effective Isolated Designs
Designing power for isolation can be one of the most challenging aspects of a design process.
The DPI Test—Know Your Digital Isolation Is Immune to Noise
Real-world, harsh environments are tricky to replicate. Let Analog Devices help! Test with direct power injection (DPI) to ensure the highest level of noise immunity for your isolated system.
Common Electromagnetic Compatibility Standards
IEC 61000-4-2 Electrostatic Discharge (ESD)
ESD is the sudden transfer of electrostatic charge between bodies at different potentials caused by near contact or induced by an electric field. ESD has the characteristics of high current in a short time period. The primary purpose of the IEC 61000-4-2 test is to determine the immunity of systems to external ESD events outside the system during operation.
IEC 61000-4-5 Surge
Surge transients are caused by overvoltage from switching or lightning transients. Switching transients can result from power system switching, load changes in power distribution systems, or various system faults such as short circuits. Lightning transients can be a result of high currents and voltages injected into the circuit from nearby lightning strikes.
IEC 61000-4-4 Electrical Fast Transients (EFTs)
EFT testing involves coupling a number of extremely fast transient impulses onto the signal lines to represent transient disturbances (associated with external switching circuits that are capacitively coupled onto the communication ports), which may include relay and switch contact bounce or transients originating from the switching of inductive or capacitive loads—all of which are very common in industrial environments.
IEC 61000-4-6 Conducted RF Immunity
The IEC 61000-4-6 conducted immunity test is applicable to products that operate in environments where RF fields are present and that are connected to mains supplies or other networks (signal or control lines). The source of conducted disturbances are electromagnetic fields, emanating from RF transmitters that may act on the whole length of cables connected to installed equipment.
IEC 61000-4-3 Radiated RF Immunity
Testing to IEC 61000-4-3 ensures that electronic equipment is immune to commonly occurring radiated RF fields. Some commonly occurring unintentional RF emitting devices in an industrial application are electric motors and welders.
IEC 61000-4-8 Magnetic Immunity
Testing to IEC 61000-4-8 ensures that electronic equipment is immune to commonly occurring magnetic fields. The source of magnetic fields in typical industrial communication applications is power line current or 50 Hz/60 Hz transformers in close proximity to the equipment.
Safety and Regulatory Compliance Information
The iCoupler family of digital isolation products has been tested and approved by various regulatory agencies, including UL, CSA, VDE, TÜV, CQC, ATEX, and IECEx. This table summarizes the achieved ratings for each product and includes links to copies of the actual safety certificates.
Selection Table for Digital Isolation Technology
Analog Devices’ selection table for digital isolation technology lets you add, remove, and configure parameters to display; compare parts and choose the best part for your design.
Video
- Compact and Quiet: A Tiny Electrification Solution
- ADI: Low EMI Isolated RS-485 for Your Energy and Solar Applications
- Got EMI? Fix It with the Latest ADI isoPower + Isolated Data
- ADI: The DPI Test - Know Your Digital Isolator is Immune to Noise
- Meeting Cispr22 Class B with ADI's Next Generation iso Power ® Device
Application Note
- AN-1572: IEC 61000-4-x and CISPR 11 Tested Analog Input Design with AD4111 for Industrial Automation ( 0) PDF
- AN-1468: Lightning Protection for Communication Interfaces in Avionics Applications ( 0) PDF
- AN-1398: System Level EMC Solution for Isolated RS-485 Communication Interfaces in Harsh Industrial Environments Using the ADM2795E ( 0) PDF
Technical Articles
- Common-Mode Transient Immunity
- Avoiding the Hidden Costs of Isolation Design—How to Manage Project Risk with Next-Generation Solutions
- The Use of Robust Digital Isolators in the Harsh Environments of Electric Motor Drives
- Meeting EMC (Electromagnetic Compatibility) Challenges With Digital Isolators
- RS-485 Communication Link vs. the Electric Fence: A Demonstration of RS-485 EMC Robustness