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EN 50121 Immunity and Emission EMC testing of Railway Equipment

EN 50121-4 EMC Testing of Railway Signaling and Telecommunication Equipment

The EN 50121-4 test standard applies to signaling and telecommunication apparatus which are installed in the railway environment. The signaling and telecommunication apparatus mounted in vehicles is covered by EN 50121-3-2. Keystone Compliance provides the peace of mind that all of your EN 50121 and railway testing needs are  met under one roof.

In addition to competitive pricing, we provide quick turnarounds on quoting. Our engineering staff provides a consultative approach throughout the entire testing program. Request a quote to see why hundreds of manufacturers trust Keystone with their regulatory compliance testing needs.

Summary of EN 50121-4 Emission and Immunity Testing of Railway Equipment Standard

EN 50121-4 EMC testing specifies limits for emission and immunity and provides performance criteria for specific signaling and telecommunications equipment. This applies to equipment that may interfere with other apparatus in the railway environment. It also applies to equipment that may increase the total emissions for the railway environment beyond appropriate standard limits. When this occurs, it may cause Electro-Magnetic Interference (EMI) to occur outside the railway system.

Ports may be intended to transmit or receive for radio communication. If this is true the emission and immunity limits at the communication frequency do not apply.

The standard does not specify basic personal safety requirements for devices such as protection against unsafe operations, and related tests. Also, the fault conditions of the devices have not been taken into account. The requirements and test methods also apply to telecommunications and signaling data and power lines connected to the equipment under test.

The frequency range considered is from d.c. to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. For products in the scope of EN 61000-3-2 or EN 61000-3-3, the requirements of those standards apply.

Emission Testing

In the context of electromagnetic compatibility (EMC) standards, the EN 61000-6-4 regulation plays a pivotal role in delineating the acceptable emission levels for electrical and electronic apparatuses. To be deemed compliant, equipment must also ensure that emissions from DC power ports remain within the thresholds established for AC power ports.

Immunity Testing

The EN 50121-4 immunity requirements meticulously outline on a port-by-port basis, ensuring that each connection point on the apparatus is evaluated for its immunity to interference.  For apparatuses featuring a multitude of similar ports or connections, the standard advises the selection of a representative sample—such as 20% of the ports or at least four ports—to accurately simulate real-world operating conditions and to encompass all different types of terminations. This methodological rigor ensures that the tests accurately reflect the apparatus’s ability to operate as intended, even in the challenging conditions of the railway environment.

The specified immunity levels are designed to guarantee that the apparatus can function correctly when exposed to interference. This may be from direct exposure to a radio frequency field or from coupling of interference from remote sources.

Notably, the standard excludes considerations related to voltages induced by traction currents

Expert EN 50121 Railways Compliance Testing Lab

Keystone Compliance provides EN 50121-4 railway testing in a professional, timely, and affordable manner. Our lab features multiple chambers, so lead times on scheduling are never an issue. In addition to EMC/EMI testing, our lab also features mechanical, product safety, wireless, ingress protection, and package testing. Regardless of the testing need, Keystone Compliance can provide the solution.

For more information on our capabilities, please contact us. If you are ready to see firsthand why so many companies rely on Keystone Compliance for their EN 50151-4 testing, please request a quote.

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