1 Scope
This standard is applicable to complete filter units for radio interference suppression used in the equipment and the whole machine connected with the mains supply, of which the rated voltage between two wires does not exceed DC 500 V or AC RMS or the rated voltage between any wire and the ground does not exceed DC 250 V or AC RMS, and the frequency does not exceed 100 Hz.
Within the scope of this standard, the combination of two or more filters in one shell is also included.
The filter composed entirely of capacitive components has been included in IEC 384-14.
This standard is not necessarily applicable completely to filters used in automobiles, airplanes or ships. Additional requirements shall be specified in the detail specifications of filters used in these occasions.
Filters within the scope of this standard can also be used to protect the equipment and the whole machine from being affected by electrical noise and instantaneous changes in voltage or current from power supply or other parts of the equipment.
If the filter is not connected to the mains supply, its safety test is not applicable and can be omitted.
2 General provisions
2.1 Related documents
GB 7343 Method of measurement of the suppression characteristics of passive radio interference filters and suppression components over the frequency range of 10kHz to 30MHz
IEC 27-1(1971) Letter symbols to be used in electrical technology - Part 1: General
IEC 50 International electrotechnical vocabulary (I.E.V)
IEC 62 Marking codes for resistors and capacitors
IEC 63 Preferred numbers of resistors and capacitors
Amendment 1 (1967) and Amendment 2 (1977) of the second edition in 1963
IEC 68 Basic environmental testing procedures
IEC 68-1(1982) Part 1: General and guidelines
IEC 68-2-1(1976) Test A: Cold (low temperature)
IEC 68-2-2(1976) Test B: Dry heat (high temperature)
IEC 68-2-3(1969) Test Ca: Damp heat, steady state
Amendment 1 (1984)
IEC 68-2-6(1982) Test Fc: Vibration (sinusoidal)
IEC 68-2-13(1983) Test M: Low pressure
IEC 68-2-14(1986) Test N: Temperature change
IEC 68-2-17(1985) Test Q: seal
IEC 68-2-20(1979) Test T: Sodering
IEC 68 2-21(1983) Test U: Robustness of terminations and integral mounting devices
IEC 68-2-27(1983) Test Ea: Shock
IEC 68-2-29(1987) Test Eb: Bump
IEC 68-2-30(1980) Test Db: Dampheat, cyclic
IEC 617 Graphical symbols for diagrams
IEC 249 Measurement of the dimensions of a cylindrical component having two axial terminations
IEC 335-1(1976) Safety of household and similar electrical appliances - Part 1: General requirements
IEC 384-14(1981) Fixed capacitors for use in electronic equipment - Part 14: Sectional specification - Fixed capacitors for electromagnetic interference suppression and connection to the supply mains
IEC 410(1973) Sampling plans and procedures for inspection by attributes
ISO 3 Preferred numbers - Series of preferred numbers
ISO 497 Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers
ISO 1000 The international system of units and its application
Note: The current editions of the above documents shall be adopted, except IEC 68, of which the specified edition must be adopted.
2.2 Units, symbols and terms
2.2.1 Overview
Units, graphic symbols, letter symbols and terms shall be selected from the following standards as far as possible:
ISO 1000, IEC 617, IEC 27-1 and IEC 50.
More items, when needed, shall be derived according to the principles of the above documents.
The terms and definitions in IEC 384-14 as well as the following terms apply:
1 Scope
2 General provisions
3 Quality assessment procedures
4 Test and measurement procedures
Annex A (Informative) Quality conformance inspection
