DIN EN 60368-4:2001-07

Clause
1 General
   1.1 Scope
   1.2 Normative references
2 Preferred values for ratings and guidance on detail
   specifications
   2.1 Preferred values for ratings and
        characteristics
   2.2 Information to be prescribed in detail
        specifications
3 Capability approval
   3.1 Eligibility for capability approval
   3.2 Structural similarity
   3.3 Procedures for capability approval
   3.4 Capability manual
   3.5 Capability qualifying components (CQC)
   3.6 Inspection requirements for CQCs
   3.7 Programme for capability approval
   3.8 Capability approval report
   3.9 Abstract of description of capability
   3.10 Modifications likely to affect the capability
        approval
   3.11 Initial capability approval
   3.12 Maintenance of capability approval
   3.13 Rework and repair work
   3.14 Quality conformance inspection
   3.15 Screening procedures
4 Test and measurement procedures
Annex A (normative) Example layout of an abstract of
        description of capability
Annex B (normative) Layout of the front page of a CQC
        specification for process control
Annex C (normative) Layout of the front page of a CQC
        specification to demonstrate boundary or limit
Annex ZA (normative) Normative references to
        international publications with their
        corresponding European publications

Applicable to piezoelectric filters as custom-built products or as standard catalogue whose quality is assessed on the basis of capability approval. It also specifies the preffered ratings and characteristics, having appropriate tests and measuring methods.