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Methods of measurement for waveguides - Graphical method for the determination of waveguide performance. Original standard BS EN 61580-7-1997 (1998) in PDF full version. Additional info + preview on request

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Methods of measurement for waveguides - Reflection coefficient at rectangular waveguide interfaces. Original standard BS EN 61580-9-1997 (1998) in PDF full version. Additional info + preview on request

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Prints and transparencies produced from electronic sources. Assessment of image quality. Original standard BS EN 61610-1996 in PDF full version. Additional info + preview on request

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Electroacoustics. Measurement of real-ear acoustical performance characteristics of hearing aids. Original standard BS EN 61669-2016 + A1-2025 in PDF full version. Additional info + preview on request

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Communication networks and systems for power utility automation - Conformance testing. Original standard BS EN 61850-10-2013 + A1-2025 in PDF full version. Additional info + preview on request

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Electrical insulation systems. Thermal evaluation of modifications to an established electrical insulation system (EIS) - Wire-wound winding EIS. Original standard BS EN 61858-1-2014 (2024) in PDF full version. Additional info + preview on request

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