BS 9070-4:1971

Cooperating organizations
Foreword
Specification
Section 4. Polystyrene dielectric capacitors
4.1 General matters
4.1.1 Scope
4.1.2 Related documents
4.1.3 Terminology
4.1.4 Letter symbols, signs and abbreviations
4.1.5 Graphical symbols
4.1.7 Eligibility for qualification approval
4.1.8 Structurally similar parts
4.1.9 Delayed delivery
4.1.10 Supplementary procedure for qualification approval
4.1.11 Certified test records
4.1.12 Standard ratings and characteristics
4.1.13 Unchecked parameters
4.1.14 Procedure to be followed in the event of failures
       at Group C inspection
4.1.15 Ordering information
4.1.16 Release before completion of Group B inspection
4.2 Test procedures
4.2.1 Measurement conditions
4.2.2 Visual examination
4.2.3 Dimensioning and gauging procedure
4.2.4 Electrical test procedures
4.2.4.1 Preliminary drying
4.2.4.2 Voltage proof
4.2.4.3 Capacitance
4.2.4.4 Tangent of the loss angle
4.2.4.5 Leakage current
4.2.4.6 Impedance
4.2.4.7 Insulation resistance
4.2.4.8 Inductance
4.2.4.9 Outer foil termination
4.2.4.10 Temperature coefficient and cyclic drift
4.2.4.11 Temperature characteristic of capacitance
4.2.4.12 Short term stability
4.2.4.13 Charge/discharge test
4.2.4.14 D.C. surge voltage test
4.2.4.15 Pressure relief test
4.2.5 Mechanical tests
4.2.6 Environmental test procedures
4.2.6.1 Robustness of terminations
4.2.6.2 Soldering
4.2.6.3 Rapid change of temperature
4.2.6.4 Bumping
4.2.6.5 Shock
4.2.6.6 Acceleration
4.2.6.7 Vibration
4.2.6.8 Climatic sequence
4.2.6.9 Damp heat, steady state
4.2.6.10 Container sealing
4.2.6.11 Storage
4.2.6.12 Mould growth
4.2.6.13 Salt mist
4.2.7 Endurance test procedures
4.3 Inspection schedule
Table
1. Initial and final measurements

Prescribes the specific tests and requirements of Sections 1 and 2 which are applicable to polystyrene dielectric capacitors. Prescribes the test schedule, giving the specific conditions of test and the initial and final measurements as required by Sections 1 and 2.