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Radiated RF
IEC 61000-4-3
OTE 1 At 90MHz and 800MHz, 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.
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 thermometer is used
exceeds the applicable RF compliance level above, the thermometer should be observed to
verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the thermometer.
Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
3V/m 80kHz
to 2.5GHz
Here P is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter
manufacturer and d is the recommended
distance in meters (m). Field strengths
3V/m
as determined by an electromagnetic
site survey, should be less than the
compliance b level in each frequency
range. Interference may occur in the
vicinity of equipment marked with the
a
b
22
d=1.2 P 80MHz to 800MHz
d=2.3 P 800MHz to 2.5MHz
separation
form fixed RF transmitters,
following symbol:
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