The primary objective of this standard is to establish a common measurement procedure to validate how well a shielded room or anechoic chamber isolates internal equipment from external electromagnetic interference.
Emission and immunity testing in fully anechoic rooms (FAR). Core Purpose of Shielding Effectiveness (SE)
Anechoic chambers are essential environments for testing Electromagnetic Compatibility (EMC). To ensure these chambers isolate electronic equipment from outside interference, engineers rely on strict international standards. One of the foundational documents for verifying this isolation is the European standard .
The actual testing involves several steps: en 50147-1 pdf
Anechoic chambers are essential environments for testing electromagnetic compatibility (EMC). They isolate sensitive equipment from external radio frequency (RF) noise and prevent internal emissions from escaping.
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Applies to fully anechoic chambers (FAC) and semi-anechoic chambers (SAC). The primary objective of this standard is to
EN 50147-1 is a harmonized European standard titled "Anechoic chambers - Part 1: Shielding effectiveness attenuation measurement" . It outlines the official methods to test how well an RF-shielded enclosure blocks outside electromagnetic fields.
Each frequency bracket dictates different physical test setups. For instance, low-frequency H-field attenuation depends heavily on the thickness and magnetic permeability of the metal sheets (such as galvanized steel). Conversely, high-frequency performance (GHz range) is sensitive to structural gaps, door seals, and the configuration of wire mesh gaskets. Step-by-Step Shielding Effectiveness Measurement Procedure To calculate shielding attenuation ( Ascap A sub s
The complete standard is split into parts targeting different aspects of chamber performance: To ensure these chambers isolate electronic equipment from
(often adopted as SIST EN 50147-1:1997) is a European Standard titled "Anechoic chambers - Part 1: Shield attenuation measurement". It is a CENELEC (European Committee for Electrotechnical Standardization) standard designed to provide a unified procedure for testing how well a shielded room or chamber attenuates external electromagnetic fields.
The standard is divided into distinct operational clauses that outline both theoretical definitions and actionable testing metrics. Authorized copies from vendors such as iTeh Standards or the BSI Knowledge Platform typically feature the following blueprint:
Air vents must allow airflow but block RF signals.
EN 50147-1 specifies a straightforward yet precise method for calculating shielding effectiveness. This calculation is based on the ratio of the voltage received by an antenna without the shield, to the voltage received when the shield is placed between the antennas, as detailed in the equation S = V0 - Vs + Aatt .
The standard is protected by copyright and must be purchased from an authorized standards distributor. Here are the key sources: