23
22
Radiated RF
IEC
61000-4-3
3V/m
80kHz to
2.5GHz
3V/m
d
=1.2
P
80MHz to 800MHz
d
=2.3
P
800MHz
to 2.5MHz
Here
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 meters
(m). Field strengths form fixed RF transmitters,
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 following symbol:
NOTE 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.
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 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.
b
Over the frequency range 150kHz to 80MHz, field strengths should be
less than 3V/m.
Recommended separation distances between portable and mobile RF
communications equipment and the infrared thermometer
The infrared thermometer is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled.
The customer or the user of the infrared thermometer can help prevent
electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications
equipment
(transmitters) and the infrared thermometer as recommended below,
according to the maximum output power of the communications
equipment.
Rated maximum
output power of
transmitter
W
Separation distance according to frequency of
transmitter
m
Rated
maximum
output power
of transmitter
W
150kHz to
80MHz
d
=1.2
P
80MHz to
800MHz
d
=1.2
P
800MHz to
2.5GHz
d
=2.3
P
0.01
0.01
0.12
0.23
0.1
0.1
0.38
0.73
1
1
1.2
2.3
10
10
3.8
7.3
100
100
12
23
For transmitters rated at a maximum output power not listed above, the recommended
separation distance d in meters (m) can be estimated using the equation applicable to
the frequency of the transmitter, where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter manufacturer.
