Stephan EVETR - Recommended Separation Distance

®
12 Electromagnetic emissions and immunity
 Fritz Stephan GmbH
GA-070T-0518V2.7-HAO-EN
239
12.3 Recommended separation distance
The EVE ventilator is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled. The
customer or user of the EVE ventilator can help prevent electromagnetic
interference by maintaining a minimum distance between portable and
mobile RF communications equipment (transmitters) and the EVE
ventilator as recommended below, according to the maximum output
power of the communications equipment.
Recommended separation distances between portable and mobile RF communications
equipment and the EVE ventilator
Maximum
transmission
power of the
transmitter
(W)
Distance based on the transmitter frequency (m)
150 kHz to
80 MHz outside
ISM bands a
150 kHz to
80 MHz in ISM
bands
a
80 MHz –
800 MHz
800 MHz – 2.5 GHz
Pd 35,0
Pd 2,1
Pd 6,0
Without
docking station
With docking
station
Pd 2,1
Pd 4,2
0.01
0.001 m
0.12 m
0.06 m
0.12 m
0.24 m
0.1
0.11 m
0.38 m
0.19 m
0.38 m
0.76 m
1
0.35 m
1.2 m
0.6 m
1.2 m
2.4 m
10
1.1 m
3.8 m
1.9 m
3.8 m
7.6 m
100
3.5 m
12 m
6 m
12 m
24 m
For transmitters without a rated output listed in the table above, the distance can be determined using the equation in the corresponding
column, where P is the transmitter's rated output in watts (W) according to the transmitter manufacturer.
1
At 80 MHz and 800 MHz, the higher frequency range applies.
2
The ISM bands between 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz;
13.553 MHz to 13.567 MHz; 26.957 MHz to 27.283 MHz and 40.66 MHz to
40.70 MHz.
3
An additional factor of 10/3 has been incorporated into the formula and is used to
calculate the recommended separation distance for transmitters in the ISM frequency
bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz to
decrease the likelihood that mobile/portable communications equipment could cause
interference if it is inadvertently brought into patient areas.
4
These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects, and people.
Tab. 52: Recommended separation distance (IEC 60601-1-2, Table 5)