BS EN 50400:2006 pdf download – Basic standard to demonstrate the compliance of fixed equipment for radio transmission (110 MHz – 40 GHz) intended for use in wireless telecommunication networks with the basic restrictions or the reference levels related to general public exposure to radio frequency electromagnetic fields, when put into service
Step 2 – Determine the relevant domain and the domain of investigation according to Clause 6. If the general public has no access to the relevant domain, i.e. there is no domain of investigation, the total exposure ratio is less than or equal to one in relevant areas where the general public has access.
Step 3 – Determine the scatter domain and the relevant sources according to Clause 6. If there is no structure in the scatter domain and if the relevant domain(s) of other relevant source(s) do not overlap with the domain of investigation, then the total exposure ratio is less than or equal to one in relevant areas where the general public has access.
Step 4 – Assess total exposure ratio by measurements or calculations according to 5.2.2 in order to determine the total exposure ratio in relevant areas where the general public has access.
5.2.2 Comprehensive total exposure ratio assessment The comprehensive total exposure ratio assessment determines the maximum total exposure ratio in relevent areas where the general public has access (i.e. in the domain of investigation). Assessment shall be carried out in particular close to any physical boundary that limits the general public access to the area around the Equipment Under Test and/or the relevant sources (see Figure 3).
The total exposure ratio shall be assessed at points of investigation using measurement and/or calculation methods described in Clauses 7, 8 and 9. The sampling step shall not be larger than the values defined in Table 1 .
The calculation and measurement methods depend on the position of the point of investigation relative to the source antenna. Each point of investigation is located in the reactive near-field or the radiating near-field or the far-field regions of the antenna (EN 50383). In the radiating near- field and the far-field, calculations and measurements can be used to estimate the E-field, H-field or power density. In the reactive near-field, it is recommended to use specific absorption rate measurements, carried out according to EN 50383. At each point of investigation, the assessed total exposure ratio shall be the maximum value of the total exposure ratios determined at each of three heights above a general public walkway (Figure 4).
5.3 Pre-analysis method The pre-analysis method enables a set of guidelines and associated constraints to be defined that together assure that the total exposure ratio is less than one in relevant areas where the general public has access. This method shall be validated using the approaches described in Clauses 5, 6, 7, 8 and 9 and shall take into account defined RF sources 1) and significant variables in the local physical environment. The guidelines 2) shall specify constraints
• to address scattering objects,
• on the influence of relevant sources on the general public access restrictions for the Equipment Under Test,
• on the influence of the Equipment Under Test on existing relevant sources’ general public access restrictions. Provided these guidelines and the associated constraints are satisfied, the total exposure ratio is less than or equal to one in relevant areas where the general public has access.