IEC 60368-4 pdf download Piezoelectric filters of assessed quality – Part 4: Sectional specification – Capability approval 1 General 1.1Scope This part of lEC 60368 applies to piezoelectric filters as custom-built products or as standardcatalogue items whose quality is assessed on the basis of capability approval. lt prescribes the preferred ratings and characteristics, with appropriate tests and measuringmethods contained in...