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Philips Medical Systems
HEARTSTART FRx 861304 OWNER’S MANUAL
APPENDICES
Recommended separation distances between portable and mobile RF
communications equipment and the HeartStart FRx Defibrillator
The HeartStart FRx Defibrillator is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled. The customer or
the user of the FRx can help prevent electromagnetic interference by maintaining a
minimum distance between portable and mobile RF communications equipment
(transmitters) and the FRx as recommended below, according to the maximum
output power of the communications equipment.
separation distance according to frequency of transmitter (m)
rated maximum output
power of transmitter (W)
80 MHz to 800 MHz
d = 0.6√ P
800 MHz to2.5 GHz
d = 1.15√ P
0.01 0.06 0.115
0.1 0.19 0.36
1 0.6 1.15
10 1.9 3.64
100 6.0 11.5
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in metres (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 range applies.
NOTE 2. The ISM (industrial, scientific and medial) 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.
NOTE 5. Transmitters/antenna of this power-level are most likely mounted on an emergency vehicle chassis. The distances
cited here are for open field. For an external antenna, the separation distance is most likely shorter.