Defibtech DDU-120 Series - Manual (Page 61)

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DAC-530E-EN-BH
Separation Distances
The DDU-120 is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or the user of the DDU-120 can help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the DDU-120 as recommended below, according to the maximum output of the
communications equipment.
Recommended separation distances between portable
and mobile RF communications equipment and the DDU-120
Separation distance according to frequency of transmitter (m)
Rated maximum
output power of
transmitter (W)
150 kHz to 80 MHz
outside ISM bands
d = 1.16 √P
150 kHz to 80 MHz
inside ISM bands
d = 1.2 √P
80 MHz to
800 MHz
d = 1.2 √P
800 MHz to
2.5 GHz
d = 2.3 √P
0.01 0.01 0.12 0.12 0.23
0.1 0.1 0.37 0.38 0.73
1 1 1.17 1.20 2.30
10 10 3.69 3.79 7.27
100 100 11.67 12.00 23.00
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in
meters (m) can be determined 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: As 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Note 2: 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.
Note 3: An additional factor of 10/3 is used in calculating the recommended separation distance for transmitters
in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz
to decrease the likelihood that mobile/portable communications equipment could cause interference if it is
inadvertently brought into patient areas.
Note 4: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects and people.