BS EN 50400:2006 pdf download
BS EN 50400:2006 pdf download.Basic standard todemonstrate thecompliance of fixedequipment for radiotransmission(110 MHz- 40 GHz)intended for use in wirelesstelecommunicationnetworks with the basicrestrictions or thereference levels related togeneral public exposure toradio frequencyelectromagnetic fields,when put into service.
6 Determination of domains and relevant sources
6.1 Principle of relevance
The principle of relevance establishes the conditions under which a radio source is considered relevant such that account has to be taken of the contribution of that source when assessing RF exposure. A radio source is considered to be relevant In locations where Its exposure ratio is greater than 0.05.
This principle is applied in three ways:
• to define the area outside which the contribution to the total exposure ratio from the Equipment Under Test in service need not be considered either for its compliance or its possible effect on other sources compliance:
• to establish if the exposure ratio from each Individual radio source is relevant and needs to be considered as a contributor to the total exposure ratio:
• to establish whether RF fields from the Equipment Under Test, when reflected by nearby structures. may increase by a significant amount the exposure ratio within the compliance boundary of the Equipment Under Test.
6.2 Determination of domains
6.2.1 Relevant domain
6.2.1.1 General procedure
The relevant domain shall be determined using the calculation or measurement methods described in Clauses 7 and 8. At the relevant domain boundary, the exposure ratio from the Equipment Under Test shall be less than or equal to 0.05,
6.2.1.2 Simplified procedure
lithe compliance boundary has been determined with respect to reference levels and according to EN 50383. the relevant domain boundary can be derived by multiplying the smallest distance between the radiating part of the antenna and the compliance boundary by a factor of 5 in a given direction (Annex C).
6.2.2 Scatter domain
6.2.2.1 General procedure
The scatter domain shall be determined using the caicuiation or measurement methods described in Clauses 7 and 8 or in EN 50383. At the scatter domain boundary, the Equipment Under Test exposure ratio shall be less than or equal to 0.1 (Annex C).
6.2.2.2 Simplified procedure
lithe compliance boundary has been determined with respect to reference levels and according to EN 50383. the scatter domain boundary can be derived by multiplying the smallest distance between the radiating part of the antenna and the compliance boundary by a factor of 3 In a given direction (Annex C).
8.3 Determination of relevant sources
Radeo sources in the frequency range 100 kHz to 40 GHz that have an exposure ratio of greater than 0.05 (6.1) in the domain of investigation shall be considered a relevant source.
A source is a relevant source if its relevant domain intersects the domain of investigation of the Equipment Under Test. Relevant sources shall be determined using measurement and/or calculation (Clauses 7 and 8),
A relevant source may be considered as
• a single (modulated) frequency,
• combined power over bandwidth of similar sources — e.g. (88 — 108) MHz,
• the combined power from a given antenna, location or mast.
To perform this estimation It is necessary to acquire sufficient information about radio sources. Reasonable endeavours shall be applied to identify all nearby sources and to determine data required to perform the exposure assessment. The following guidance is offered on procedures that can be used.
National database.
Where there Is a national database (acknowledged by the appropriate licensing authority) providing the parameters for radio sources, this may be used. If such a database provides further information on the Exposure Ratio from one or all radio sources near the Equipment Under Test, then this data may be used as part of an exposure assessment.
Visual inspection:
Nearby antennas will be visible in many instances, for example broadcast masts, radars and cellular installations Although it is noted that small unobtrusive antennas that have been designed to harmonize with the surroundings may require some searching work.
S’ecfrum measurement
In some instances, measurement can be used to identify RF sources. This search may be limited to frequencies below 6 GHz.
