Minimum Distance To Antenna In Accordance With Fcc (Usa) - Siemens Simatic RF600 System Manual

2.3.3

Minimum distance to antenna in accordance with FCC (USA)

Minimum distance to antenna in accordance with FCC (USA)
For the maximum permitted radiated power in accordance with FCC (4 W EIRP), the "safety
distance" is d = 0.26 m. This means that personnel should not remain closer than 26 cm to
the transmitter antenna for extended periods (several hours without interruption). Remaining
within the vicinity of the antenna for brief period, even repeated periods (at a distance < 0.26
m) is harmless to health according to current knowledge.
The horizontal line at 41.25 V/m marks the "safety limit value".
Distance to transmitter antenna [m]
If the transmit power is set lower than the highest permitted value (4 W EIRP), the "safety
distance" reduces correspondingly.
The values for this are as follows:
Generally a safety distance of at least 0.2 m should be maintained.
SIMATIC RF600
System Manual, xx/2014, J31069-D0171-U001-A15-7618
1
5
Radiated power EIRP [W]
4.0
<2.5
2.3 Safety distance to transmitter antenna
Feld strength [V/m]
10.9
2.2
Safety distance to transmitter antenna [m]
Safety Information
% of limit value
26
5.3
0.26
>0.20
27