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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 LMD-XH550MD is used exceeds the applicable RF compliance level above,
the LMD-XH550MD should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the LMD-
XH550MD.
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
The LMD-XH550MD is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the LMD-XH550MD can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the LMD-XH550MD as recommended below, according to
the maximum output power of the communications equipment.
Rated maximum
output power of
transmitter
W
0.01
0.1
1
10
100
For transmitters rated a maximum output power not listed above, the recommended separation
d
distance
in meters (m) can be estimated using the equation applicable to the frequency of the
P
transmitter, where
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.
and the LMD-XH550MD
Separation distance according to frequency of transmitter
IEC 60601-1-2 : 2007
150 kHz to
80 MHz to
80 MHz
800 MHz
d
P
d
= 1.2
= 1.2
0.12
0.12
0.38
0.38
1.2
1.2
3.8
3.8
12
12
m
800 MHz to
2.5 GHz
P
d
P
= 2.3
0.23
0.73
2.3
7.3
23
7
IEC 60601-1-2: 2014 + A1: 2020
150 kHz to
80 MHz to
80 MHz
2.7 GHz
d
P
d
= 1.2
= 2.0
0.12
0.20
0.38
0.63
1.2
3.8
12
P
2.0
6.3
20
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