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Electroacoustics. Measurement microphones - Absolute pressure calibration of microphones at low frequencies using calculable pistonphones. Original standard PD IEC TR 61094-10-2022 in PDF full version. Additional info + preview on request

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Programmable controllers - User guidelines. Original standard PD IEC TR 61131-4-2004 in PDF full version. Additional info + preview on request

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Industrial-process measurement and control. Programmable controllers - Guidelines for the application and implementation of programming languages. Original standard PD IEC TR 61131-8-2017 in PDF full version. Additional info + preview on request

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Multicore and symmetrical pair/quad cables for digital communications - Correction procedures for the measurement results of return loss and input impedance. Original standard PD IEC TR 61156-1-5-2013 in PDF full version. Additional info + preview on request

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Multicore and symmetrical pair/quad cables for digital communications - Nominal DC-resistance values of floor-wiring and work-area cables for digital communications. Original standard PD IEC TR 61156-1-6-2016 in PDF full version. Additional info + preview on request

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Circuit boards and circuit board assemblies. Design and use - 3D shape data for CAD component library. Original standard PD IEC TR 61188-8-2021 in PDF full version. Additional info + preview on request

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