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

Note
Reduced maximum radiated power with RF620R/RF630R readers
The SIMATIC RF620R (ETSI) reader has a maximum radiated power of 0.5 W ERP. The
maximum safety distance is therefore 0.12 m.
The SIMATIC RF630R (ETSI) reader has a maximum transmitter power of 0.5 W. The
radiated power therefore depends on the antenna cable and the type of antenna used, but
must not exceed the 2 W ERP.
2.3.3

Minimum distance to antenna in accordance with FCC (USA)

Minimum distance to antenna in accordance with FCC (USA)
For the maximum permisisble transmission power in accordance with FCC (4W EIRP), the
"safety distance" d = 0.26 m. This means that personnel should not remain closer than 26cm
to the transmitter antenna for extended periods (more than 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] Feld strength [V/m]
If the transmitter power is set lower than the highest permissible value (4 watts ERP), the
"safety distance" reduces correspondingly.
The values for this are as follows:
SIMATIC RF600
System Manual, 06/2010, J31069-D0171-U001-A10-7618
1
5
Draft Version 02.06.2010
2.3 Safety distance to transmitter antenna
% of limit value
10,9
2,2
Safety Information
26
5,3
19