7
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 UP-DF550 is used exceeds the
applicable RF compliance level above, the UP-DF550 should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relocating the UP-DF550.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
c The ISM (industrial, scientific and medical) bands 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.
Recommended separation distances between portable and mobile RF communications equipment
and the UP-DF550
The UP-DF550 is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the UP-DF550 can help prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF communications equipment (transmitters) and the UP-DF550
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
IEC 60601-1-2 : 2007 IEC 60601-1-2 : 2014
150 kHz to
80 MHz
d = 1.2 √P
80 MHz to
800 MHz
d = 1.2 √P
800 MHz to
2.5 GHz
d = 2.3 √P
150 kHz to
80 MHz
d = 1.2 √P
80 MHz to
2.7 GHz
d = 2.0 √P
0.01 0.12 0.12 0.23 0.12 0.20
0.1 0.38 0.38 0.73 0.38 0.63
1 1.2 1.2 2.3 1.2 2.0
10 3.8 3.8 7.3 3.8 6.3
100 12 12 23 12 20
For transmitters rated 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.
NOTE 1: At 80 MHz and 800 MHz, the separation distance for 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.
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