Interference testing
IEC 60601 test level
Conformity
level
Electromagnetic environment - explanations
Recommended minimum distances
Portable and mobile HF telecommunication devices must
keep the recommended minimum distance from the
FRED
PA-1
®
and all its components, incl. cables; the recommended
minimum distance is calculated based on the transmitter's fre-
quency.
Conducted HF
IEC 61000-4-6
3 Veff between 150 kHz and
80 MHz outside of the ISM fre-
quency bands
a
10 Veff between 150 kHz and
80 MHz in ISM frequency bands
a
Not applicable
Not applicable
No mains power is used
Radiated HF
IEC 61000-4-3
10 V/m 80 MHz to 2.5 GHz
10 V/m
d
12
10
------
P
=
between 80 MHz and 800 MHz
d
23
10
------
P
=
between 800 MHz and 2.5 GHz
where P is the maximum transmitting power of the transmitter
in Watt (W) according to manufacturer data, and d the recom-
mended minimum distance in metres (m)
b
.
The field strength of stationary HF transmitters (according to
an on-location measurement
c
) must not exceed the conform-
ity level for each frequency range
d
.
When operating the device near devices bearing the
symbol “ionising radiation”, interferences can occur.
Note 1
For 80 MHz to 800 MHz, the higher frequency range applies.
Note 2
These guidelines might not always be applicable. Electromagnetic radiation is influenced by absorption and reflection on struc-
tures, objects and people.
a. The ISM frequency bands (ISM = industrial, scientific, medical) 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.
b.
The conformity levels within the ISM frequency bands between 150 kHz and 80 MHz and between 80 MHz and 2.5 GHz serve to minimise
the probability of interferences caused by mobile/portable communication equipment that accidentally happens to be in the patient environ-
ment. The formula for the calculation of the recommended distance has been adapted by the factor 10/3 for transmitters in this frequency
range.
c.
The field strength of stationary transmitters, e.g. base stations for radio telephones (mobile or cordless) and portable radio equipment, am-
ateur radios, AM and FM radios and TV signals cannot be predicted accurately in a theoretical way. In order to analyse electromagnetic
environments caused by stationary HF transmitters, an electromagnetic analysis on site should be considered. If the measured field
strength exceeds the HF conformity level, it needs to be checked whether the
FRED PA-1
®
can be used in this environment. If an abnormal
behaviour is detected, additional measures need to be taken, e.g. reorientation or change of location of the
FRED PA-1
®
.
d.
For the frequency range between 150 kHz and 80 MHz, the field strength must be lower than 3 V/m.
7
Technical Data
7.4
Electromagnetic interferences
Page 56
A
rt.
no.
: 0-4
8-02
40 Rev. c
FRED PA-1
