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Recommended separation distances between portable and mobile RF communications equipment and the
ZOLL ventilators.
The ZOLL ventilators are intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the ZOLL ventilators can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communication equipment (transmitters) and the
ZOLL ventilators as recommended below, according to the maximum output power of the communication
equipment.
Rated maximum output
power of transmitter (W)
0.01
0.1
1
10
100
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: At 80 MHz and 800 MHz, the separation distance for the higher frequency 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 has been incorporated into the formula 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 of 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.
906-0731-01 Rev. J
IEC 60601-1-2 clause 5.2.2.2: life support equipment
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
150 kHz to 80
outside ISM bands
MHz in ISM bands
d = 1.17
d = 1.12
√P
0.117
0.37
1.17
3.7
11.7
ZOLL Portable Critical Care Ventilator
80 MHz to 800
MHz
d = 0.6
√P
√P
0.12
0.06
0.38
0.19
1.2
0.6
3.8
1.9
12
6
800 MHz to 2.5
GHz
d = 1.15
√P
0.115
0.36
1.15
3.6
11.5
A-7
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