38
a.
Theoretically, the field strength of stationary transmitters, such as base stations of wireless
telephones and land mobile services, amateur radio stations, AM and FM radio and television
stations, cannot be predicted precisely. An investigation of the site is recommended to
determine the electromagnetic environment due to stationary HF transmitters. If the
determined on-site field strength of the model TEN 250 exceeds the conformity level specified
above, the normal operation of the model TEN 250 must be observed at every application
site. If unusual performance characteristics are observed, additional measures might have to
be taken, such as reorientation or relocation of the model TEN 250.
b.
Not applicable above
the frequency range from 150 kHz to 80 Mhz.
Recommended protective distances between portable and mobile HF telecommunication
devices and the [DEVICE or the SYSTEM].
The model TEN 250 is intended for operation in an electromagnetic environment in which the
HF disturbances are controlled. The customer or user of the model TEN 250 may contribute to
the avoidance of electromagnetic disturbances by observing the minimum distance between
portable and mobile HF telecommunication devices (transmitters) and the model TEN 250,
depending on the output rating of the communication device as specified below.
Rated power of the
transmitter W
Protective distance depends on the transmission frequency m
150 kHz to 80 Mhz
d=1.2 P
80 Mhz to 800 Mhz
d=1.2
800 Mhz to 2.5 Ghz
d=2.3
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters whose rated power is not specified in the table above, the distance can be
caculated with the help of the formula of the respective column, with P being the rated power of
the transmitter in watt (W) in accordance with the specification of the transmitter manufacturer.
NOTE 1
For the calculation of the recommended protective distance of transmitters in the
frequency range from 80 MHz to 2.5 GHz, an additional factor of 10/3 was used to minimise
the possibility that a mobile/portable communication device unintentionally brought into the
patient area could lead to disturbances.
NOTE 2
These guidelines might not apply to all situations. The spreading of electromagnetic
waves is influenced by absorptions and reflections of buildings, objects and people.
ELECTRIC IMMUNITY
21.0 Information regarding electromagnetic immunity
GB
4. PJN157-14_GA-GB_HHD_TEN250_31.03.14
Montag, 31. M
rz 2014 12:10:44
