BS 833:1970

Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 Definitions
2. Limits
2.1 Limits of radiation
3. Method of measurement
3.1 Measuring apparatus
3.2 Measuring site
3.3 Disposition of measuring aerial when testing road
     vehicles and boats
3.4 Disposition of the measuring aerial for all other
     equipment
3.5 Test procedure
3.6 Type approval
3.7 Production conformity in type-approved equipment
4. Measurement of insertion loss
4.1 General
4.2 Measurement of the insertion loss of ignition
     suppressors
Appendices
A. Examples of suppression arrangements for ignition
     systems
B. Suppression components (suppressors)
Tables
1. Limits of radiation
2. Examples of suppression arrangements
Figures
1. Graphical presentation of limits of radiation
2. Position of aerial relative to vehicle
3. 15 kV annular spark gap
4. Suppression devices
5. Test circuit
6. General arrangement of test box
7. Details of test box lid
8. Details of test box
9. Straight plug suppressor (screened or unscreened)
10. Right angle plug suppressor (screened or
     unscreened)
11. Suppressed plug
12. Resistor brush in distributor cap
13. Resistor in distributor cap
14. Resistive rotor
15. Interference suppression ignition cable (resistive
     or reactive)
16. Practical arrangement for insulation test

For frequency range 40 MHz to 250 MHz from road vehicles, portable prime movers, construction equipment, agricultural machinery and boats. Method of measurement; insertion loss of components used in making up radio interference suppression devices. Does not apply to aircraft.