RADWAG WPT/8B 300C Ramps Bed Scales - Manual (Page 60)

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Electromagnetic
disturbances within
the RF range
according to
IEC 61000-4-6
3 Vrms
26 kHz to 80
MHz
3 Vrms d=1,2√P
Electromagnetic
disturbances within
the RF range
according to
IEC 61000-4-3
3 V/m
80 MHz to 1
GHz
3 V/m d=1,2√P 80 MHz to 800 MHz
d=2,3√P 800 MHz to 2,5 GHz
Where P is a maximal transmitter output power
value in watts (W) according to information
from a manufacturer.
d is a recommended, minimal distance in
meters (m).
The power of electromagnetic disturbances
from stationary transmitters of RF, settled in
conditions on the spot (a), should be lower
than the level of compliance for every
frequency range (b).
Interference can appear in the proximity of
devices marked with the following sign:
Caution 1: For 80 MHz and 800 MHz higher frequency range is taken.
Caution 2: Given information are not applicable in every situation. Propagation of
electromagnetic waves is influenced by absorption and reflection from surfaces, objects and
persons.
(a) Powers sourcing from fields of specific transmitters such as base stations in cellular
telephony, radio transmitters, amateur radios, AM and FM radio transmission and TV
transmission cannot be theoretically estimated. To estimate an electromagnetic environment
testing local conditions needs to be considered. If the measured field power on the spot of
DEVICE operation overpasses an acceptable level of compliance, there should be tested if the
DEVICE operates properly. If an inappropriate operation appears it may be necessary make
some preventions such as displacement of the DEVICE.
(b) For frequencies outside the range 150 kHz to 80 MHz, the field power should not be
greater than 3 V/m.
RF – frequency from the interval o electromagnetic spectrum which is between the lower range
of radio frequencies of long waves and the infrared range; frequencies useful for radio
transmission. Limit frequencies are 9 kHz and 3 000 GHz
CAUTION! Portable devices for RFI communication can
influence ELECTRICAL MEDICAL DEVICES