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BS 9120:1988
Current
The latest, up-to-date edition.
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Specification for radio interference suppression filters of assessed quality: generic data and methods of test
Hardcopy , PDF
English
29-02-1988
Foreword
Committees responsible
Specification
Section one. Principles and mandatory procedures
1.1 General matters
1.1.1 Scope
1.1.2 Related documents
1.1.3 Terminology
1.1.4 Letter symbols, signs and abbreviations
1.1.5 Graphical symbols
1.1.6 Marking
1.1.7 Eligibility for qualification approval
1.1.8 Structurally similar components
1.1.9 Delayed delivery
1.1.10 Supplementary procedures for qualification
approval
1.1.11 Certified test records
1.1.12 Ratings and characteristics
1.1.13 Uncheck parameters
1.1.14 Procedure to be followed in the event of a
failure in a periodic test
1.1.15 Release for delivery before completion of group
B tests
1.1.16 Component parts of filter assemblies
1.1.17 Capability approval
1.2 Test procedures
1.2.1 General
1.2.2 Measurement conditions
1.2.3 Visual examination
1.2.4 Dimensions and gauging
1.2.5 Electrical test procedures
1.2.6 Mechanical test procedures
1.2.7 Environmental testing procedures
Section two. General rules for the preparation of detail
specifications
2.1 Basic information
2.1.1 General
2.1.2 Originator of the detail specification
2.1.3 Detail specification number
2.1.4 Description of the component and intended
application
2.1.5 Drawings
2.1.6 Ratings (including limiting conditions of use)
2.1.7 Related documents
2.1.8 Additional information that is not for inspection
purposes
2.2 Inspection requirements
2.2.1 General
2.2.2 Group A inspection
2.2.3 Group B inspection
2.2.4 Group C inspection
2.2.5 Group D inspection
2.3 Certified test records
2.3.1 General information
2.3.2 Attributes information
2.3.3 Measurements information
2.4 Instructions for ordering components
2.5 Low-volume, high-cost items
Appendices
A. Example of a certified test record
B. Voltage proof test
C. Measurement of leakage current (mains filter units
only)
D. Endurance tests for mains filter units
E. Test for electrical shock hazard under normal
conditions
F. Tests on cable or cords and their anchorage to
filter units
G. Temperature rise at rated current test
H. Spike test
J. Measurement of connector contact resistance
K. Dust and sand resistance test
Tables
1. Peak pulse voltages
2. Filter unit terminations
3. Insertion loss limits
4. Creepage and clearance limits
5. Test voltages for insulation resistance
6. Tensile test force for wire terminations
7. Cable sizes and current ratings
8. Maximum sizes of cables and conduit for rated
currents up to 16 A
9. Number of 24 h cycles
10. Inspection procedure for filters. Group A tests
11. Inspection procedure for filters. Group B tests
12. Inspection procedure for filters. Group C tests
13. Inspection procedure for filters. Group D tests
14. Values for endurance testing
15. Final inspection, measurements and requirements
16. Number of specimens to be tested for rated voltage
(mains filter units only)
17. Minimum creepage and clearance distances at rated
voltages
18. Torque values for screws and nuts
19. Cable pulling
20. Permissible cable and cord masses for given rated
current
Figures
1. D.C. voltage proof test circuit
2. Class II single-phase filter units
3. Single-phase filter units other than class II
4. Three-phase filter units
5. Application of test voltage
6. Spike test circuit detail
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