20
test level
Radiated RF
IEC 61000-
4-3
3 V/m
80 MHz
to 2,5
GHz
3 V/m
Portable and mobile RF communications
equipment should be used no closer to any
part of the Fetal Doppler including cables,
than the recommended separation distance
calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
a. Where P is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter manufacturer
and d is the recommended separation
distance in metres (m). Field strengths from
fixed RF transmitters, as determined by an
electromagnetic site survey, should be less
than the compliance level in each frequency
range.
b. Interference may occur in the vicinity of
equipment marked with the following
symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects and people.
a. Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless)
telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV
broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic
environment due to fixed RF transmitters, an electromagnetic site survey should be
considered. If the measured field strength in the location in which the Fetal Doppler is used
exceeds the applicable RF compliance level above, the Fetal Doppler should be observed to
verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as re-orienting or relocating the Fetal Doppler.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications
equipment and the Fetal Doppler.
The Fetal Doppler is intended for use in an electromagnetic environment in which radiated