Explore practical parts for test and measurement, repair and development projects, and networked equipment. Find filters, ferrites, USB isolators and shielding materials, with EMC engineering guidance to help you check what suits your setup.
Start with an application below, shop by product type or explore our EMC guides. You can also ask our engineers for help or check our delivery information.
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USB noise and ground loops
Compare USB filters and isolatorsExplore ways to tackle unwanted noise in USB-connected instruments and development setups. Our guide compares filters and isolators by connector, data rate and power.
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Noise on Ethernet cables
Choose an Ethernet filterFind a filter for Ethernet-connected equipment. Compare 10/100 and Gigabit data models, and check the limits for connections that also carry power.
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Shielding prototypes and enclosures
Explore shielding materialsFind materials for test covers, prototypes and enclosures. Compare fabrics, tapes, gaskets and boxes, with practical guidance on seams, openings and cable entries.
Shop by product type
Explore the emcfixSHOP range
In-line filters, shielding materials and practical components. Check each product’s specifications to match it to your application.
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Ethernet EMC Filter – 10/100 Mbps
Regular price £40.00 GBPRegular price -
KEN-137 Ethernet Filter – Engineering Evaluation
Application review required -
Conductive Faraday Shielding Fabric — 3.0 × 1.1 m
Regular price £40.00 GBPRegular price -
Conductive Faraday Shielding Fabric — 0.5 × 1.1 m
Regular price £15.00 GBPRegular price
EMC: the basics
Electromagnetic compatibility (EMC) is the ability of electrical and electronic equipment to work in its intended environment without causing unacceptable interference or being unduly affected by it. Electromagnetic interference (EMI) is the disturbance itself.
EMC is an important part of product design and compliance. The requirements depend on your product and where it will be used.
Example: noise on an Ethernet cable. An in-line Ethernet filter may help reduce unwanted noise on a 10/100 Mbps connection. Check the data rate, connections and application requirements before choosing a filter, then verify the result in your system.
Understanding emissions
EMC covers both emissions and immunity. Electronic products generate electromagnetic energy during normal operation; unwanted noise can interfere with other equipment nearby.
Radiated emissions travel through the air. Conducted emissions travel along cables and other conductive paths. Identifying the path helps you choose where filtering or shielding may be useful.
Example: noise travelling along a power cable. A cable can carry noise from equipment and radiate it into the surrounding area. A suitable ferrite may help reduce this noise. Match the cable diameter and ferrite impedance data to your application, and check the result in your system.
Understanding immunity
Immunity describes how equipment continues to function when exposed to electromagnetic disturbances from external sources, such as other electrical products.
Depending on the product and its environment, relevant tests can include:
- Conducted immunity
- Radiated immunity
- Electrostatic discharge (ESD)
- Electrical fast transients (EFT)
- Magnetic field immunity
- Voltage dips and interruptions
- Surges
Example: equipment malfunctions when nearby loads switch. Switching can create transients on a shared supply. EFT and surge tests investigate different types of transient disturbance. Correctly specified varistors can form part of a protection solution; their ratings and the surrounding circuit must suit the application.
Browse our varistors or contact us to discuss your requirements.
From a first prototype to a larger order.
Tell us about your equipment, the issue you are investigating and any test results. Include the connections, data rate and power requirements where relevant so our EMC engineers can help you narrow the options.
Custom enclosures start from £30 including design, manufacture and delivery, with no minimum order and a quotation before you order. We also design custom filters and quote for larger quantities.
We aim to reply within 24 hours of receiving your enquiry.