- Power density ( S)
Is the power per unit area normal to the direction of propagation of electromagnetic wave. The unit is W/m2, also used mW/cm2 and μW/cm2. Power density is a vector quantity and its relation to electric and magnetic fields is: S = E x H
For a plane wave power density is related to electric and magnetic field by the impedance of free space.
- Electric Field Strength (E)
The magnitude of the electric field vector expressed in units of volts per meter (V / m), their multiples or fractions.
- Magnetic field strength (H)
The magnitude of the magnetic field vector expressed in units of ampere per meter (A / m), their multiples or fractions.
- EIRP - Equivalent isotropic radiated power (or actual)
Is the product of the power supplied to an antenna and the antenna gain in a given direction on the isotropic radiator.
- Near Field
Region in the vicinity of the antenna or radiating structure, in which electric and magnetic fields do not have the character of plane wave.
In immediate proximity to the antenna reactive field dominated, while between this area and for far-field radiation fields predominate, but with an angular field distribution depends on the distance to the antenna.
- Far Field
Is the region where the angular distribution of field emitted by the antenna is independent of distance from it. This region is also called "region of space" and the fields have the predominant character of plane wave.
The distance that can be considered to start far-field zone depends on the type of antenna.
- Purpose of the measurement
Measure the resulting electric field (E) and / or magnetic field (H) and / or power density (S) generated by the contribution of all sources of radio frequencies and / or Microwave affecting the low extent.
-MEP - Maximum Permissible Exposure
RMS electric field, magnetic density or equivalent plane wave power, which peoplecan be exposed without adverse effects and with an acceptable safety factor.
These exposure limits are a function of frequency and sets standards based onbiophysical studies, biological and epidemiological studies leading up to this protocol.
InArgentina the MSyAS byResolution 202/1995.
- Safety clearance
Distance from the radiating system or from its location at which the power density is10mW/cm2 or its equivalent electric field (E) or magnetic field (H).
According to Resolution 202/1995 MSyAS Volume I p. 169 "Manual safety standardsfor exposure to radio frequencies between 100 kHz and 300 GHz, the professionals involved may not stay more than 6 minutes on these points.
- Measurement Points
Clearly identified points of space, the selection is made at the discretion of theprofessional speaker, where measurements are made.
- Area Measurement
Clearly identified geographical area, to which belong the measuring point.
Defining Measurement Area and Measurement Points aims to wean the measurements for thedistances of the location of the systems, as there may be an area that has a spacemeasuring two or more sites or none.
The measurement area can be:
Built area: area with buildings, mostly over 10 m in height.
Open area: Area with buildings, mostly not over 10 m in height
- Point of exposure
Measurement is the point where the measured value exceeds the value established by the legislation MEP for / the frequency / s in question.
- Exploratory measurement
Fast measurement made the professionals involved to determine the safety distancein order to preserve their physical safety.
- Professional Intervener / Acting
Licensed professional with incumbents to perform the measurements provided.
MEP - Maximum Permissible Exposure
Maximum allowable levels of non-ionizing radiation power density, electric field and magnetic field public exposure, depending on the frequency.
These levels are set byResolution MSyAS 202/1995as binding by SC Resolution 530/2000 or inthe futurethose emanating from the competent authority.-