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High voltage direct current (HVDC) substation audible noise. Original standard PD IEC TS 61973-2012 + A1-2019 in PDF full version. Additional info + preview on request
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Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. Glossary - Piezoelectric, dielectric and electrostatic oscillators. Original standard PD IEC TS 61994-3-2021 in PDF full version. Additional info + preview on request
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Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. Glossary - Piezoelectric materials. Synthetic quartz crystal. Original standard PD IEC TS 61994-4-1-2018 in PDF full version. Additional info + preview on request
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Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. Glossary - Piezoelectric materials. Single crystal wafers for surface acoustic wave (SAW) devices. Original standard PD IEC TS 61994-4-4-2018 in PDF full version. Additional info + preview on request
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Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. Glossary - Piezoelectric sensors. Original standard PD IEC TS 61994-5-2019 in PDF full version. Additional info + preview on request
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Attenuation uniformity in optical fibres. Original standard PD IEC TS 62033-2000 in PDF full version. Additional info + preview on request
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