zebris Medical GmbH
FDM Technical Data and Operating Instructions
Page 35/36
Guidelines and Manufacturer's Statement - Electromagnetic Interference Immunity
The FDM force-distribution measuring system is intended for use in the electromagnetic environment described below. The customer
or user of the FDM force-distribution measuring system should ensure that it is operated in such an environment.
Interference
immunity tests
IEC 60601
test levels
Compliance level
Electromagnetic environment guidelines
Portable and mobile wireless sets should not be used in
closer proximity to the FDM force-distribution measuring
system, including the cables, than the recommended safety
distance, that is calculated on the basis of the formula
suitable for the transmitting frequency.
Recommended safety distance:
Conducted RF interference
quantities acc. to IEC
61000-4-6
3 V
eff
150 kHz to 80 MHz
3 V
eff
P
d
2
,
1
Radiated RF interference
quantities acc. to IEC
61000-4-3
3 V/m
80 MHz to 2.5 GHz
3 V/m
P
d
2
,
1
80 MHz to 800 MHz
P
d
3
,
2
800 MHz to 2.5 GHz
With
P
as the rated output of the transmitter in watts (W)
according to the information provided by the manufacturer
of the transmitter und
d
as the recommended safety
distance in meters (m).
The field strength from fixed RF transmitters as determined
by an electromagnetic site survey
a
is less than the
compliance level
b
in all the frequencies.
Interference is possible in the proximity of devices featuring
the following pictograph
NOTE 1
The higher value applies in the case of 80 MHz and 800 MHz
NOTE 2
These guidelines may not be applicable in all situations. The spread of electromagnetic waves is influenced
by absorption and the reflections of buildings, objects, and people
a
The field strength of stationary transmitters, such as the base stations of mobile phones and land mobile services, ham radio
stations, AM and FM radio and TV broadcasters is theoretically not 100% predictable. A site study is recommended to
determine the electromagnetic environment as a result of stationary RF transmitters. If the measured field strength at the site of
the FDM force distribution measuring system exceeds the compliance levels listed above, the FDM force distribution measuring
system must be monitored to document its proper functionality at every place of application. Additional measures might become
necessary, e.g. modifying the orientation or moving the location of the FDM force-distribution measuring system, if unusual
performance characteristics are observed.
b
The field strength is less than 3 V/m for the frequency range of 150 kHz to 80 MHz
Recommended Safety Distances between Portable and Mobile RF Telecommunications Devices and
the FDM/FDM force-distribution measuring system
The FDM force-distribution measuring system is intended for use in an electromagnetic environment where RF interference quantities
are controlled. The customer or user of the FDM force-distribution measuring system can contribute towards preventing
electromagnetic emissions by complying with the minimum distance between portable and mobile RF telecommunications devices
(transmitters) and the FDM force-distribution measuring system, as recommended below in accordance with the maximum output
power of the communication device.
Rated output of the
transmitter (W)
Safety distance based on the transmitting frequency (m)
150 kHz to 80 MHz
P
d
2
,
1
80 MHz to 800 MHz
P
d
2
,
1
800 MHz to 2.5 GHz
P
d
3
,
2
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
The safety distance for transmitters with a rated output not listed in the table above, can be calculated by applying the formula
corresponding to the respective column, whereby P is the rated output of the transmitter in watts (W) as specified by the transmitter
manufacturer.
NOTE 1
between 80 MHz and 800 MHz the higher value is valid.
NOTE 2 These guidelines may not be applicable in all situations. The spread of electromagnetic waves is influenced by absorption
and the reflections of buildings, objects, and people.
