BS EN 140210:1995

Foreword
Section 1 - General
1.1 Scope
1.2 Related documents
1.3 Information to be prescribed in detailed
          specifications
1.3.1 Outline drawings and dimensions
1.3.2 Mounting
1.3.3 Marking
1.3.4 Ordering information
1.3.5 Additional information (not for inspection
          purposes)
1.4 Units, symbols and terminology
1.5 Marking of component and package
Section 2 - Preferred ratings and characteristics
2.1 Preferred climatic categories
2.2 Preferred values of ratings
2.2.1 Rated resistance
2.2.2 Tolerance on rated resistance
2.2.3 Rated dissipation
2.2.4 Limiting element voltage
2.3 Preferred values of characteristics
2.3.1 Temperature coefficient of resistance
2.3.2 Limits for change in resistance
Section 3 - Quality assessment procedures
3.1 Eligibility for capability approval
3.2 Primary stage of manufacture
3.3 Structural similar components
3.4 Procedures for capability approval
3.4.1 General
3.4.2 Application of capability of approval
3.4.3 Granting of capability approval
3.5 Capability manual
3.6 Capability qualifying components (CQCs)
3.6.1 CQCs for process quality control
3.6.2 CQCs for demonstrating limits of capability
3.7 Inspection requirements of CQCs
3.8 Programme for capability approval
3.9 Capability approval test report
3.10 Abstract of description of capability
3.11 Modification likely to affect the capability
          approval
3.12 Initial capability approval
3.12.1 Procedure in the event of failure
3.12.2 General plan for the selection of CQCs
3.12.3 Process control test plans
3.12.3.1 Winding element - visual and dimensional
3.12.3.2 Element/termination connections - visual
          examination
3.12.3.3 Coating application - visual examination
3.12.3.4 Temperature profile of oven or kiln
3.12.3.5 Lead preparation and soldering - visual
          examination
3.12.3.6 Termination completion - visual examination
3.12.3.7 Bulk metal element fabrication - visual
          examination
3.12.3.8 Moisture content of ceramic powders
3.12.3.9 Visual examination after pressing
3.12.3.10 Visual examination after metallizing
3.12.3.11 Batch release for finding after 100% resistance
          measurement
3.12.3.12 Marking
3.12.3.13 100% resistance test
3.12.3.14 Visual examination after packaging
3.12.4 Test plans for CQCs demonstrating limits of
          capability
3.12.4.1 Range of case sizes
3.12.4.2 Range of terminations
3.12.4.3 Minimum, maximum and critical resistance in
          smallest and largest case size
3.12.4.4 Numbers of resistor sections per case size (ns)
3.12.4.5 Rated dissipation and case size
3.12.4.6 Dissipation at upper category temperature
3.12.4.7 Limiting element voltage for smallest and
          largest case size
3.12.4.8 Overload
3.12.4.9 Isolation voltage
3.12.4.10 Temperature characteristic of resistance
3.12.4.11 Climatic category
3.12.4.12 Rated temperature
3.12.4.13 Vibration severity
3.12.4.14 Bump or shock severity
3.12.4.15 Low air pressure severity
3.12.4.16 Reactance
3.12.4.17 Robustness of the resistor body
3.13 Maintenance of capability approval
3.14 Extension of capability approval
3.15 Quality conformance inspection
3.16 Screening procedures
3.17 Delayed delivery
Section 4 - Test and measurement procedures
Annexes
A. Example of an abstract description of capability
      for inclusion in CECC 00 200
B. Layout of the front page of a CQC specification
C. Requirements for capability approval test report
D. Requirements for the form and content of a
      capability manual
Figures
1a. Conformal-coated wire/tape-wound power resistor
      manufacture. Mandatory process controls and process-
      control CQCs are denoted by double borders
1b. Mental-case or insulated-case wire/tape-wound power
      resistor manufacture. Mandatory process controls
      and process-control CQCs are denoted by double
      borders
1c. Metal bulk element power resistor manufacture.
      Mandatory process controls and process-control
      CQCs are denoted by double borders
1d. Ceramic/carbon power resistor. Mandatory process
      controls and process-control CQCs are denoted by
      double borders
1e. Manufacture of power resistor. Mandatory process
      controls and process-control CQCs are denoted by
      double borders
1f. Maintenance of capability approval for power
      resistors. Mandatory capability-limit CQCs
Tables
0.1
1. Test schedule for initial capability approval limits
      of capability
2. Test schedule maintenance of capability approval,
      process control

This specification applies to fixed power resistors with related dissipation not less than 2W, primarily intended for application in electronic equipment. It gives preferred ratings and characteristics and selects from the generic specification BS EN 140000 the appropriate capability approval procedures.