ResMed Stellar Serie Guide De L'utilisateur page 5

Recommended separation distances between portable and mobile RF
communications equipment and the device
The device is intended for use in an environment in which radiated RF disturbances are controlled.
The customer or the user of the device can help prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF communications equipment (transmitters) and
the device 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 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:
• At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
• These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Potential impact of electromagnetic disturbances
The loss or degradation of the following clinical functions due to electromagnetic disturbances could
result in compromised patient safety:
• Accuracy of ventilation control
• Accuracy of monitoring of airway pressure and volume
• Therapy alarms
Detection of this degradation could be observed by the following device behaviour:
• Erratic ventilation delivery
• Rapid fluctuations in monitored parameters
• False activation of therapy or technical alarms
WARNING
Portable RF communications equipment (including peripherals such as antenna cables and
external antennas) should be used no closer than 30 cm to any part of the device, including
cables specified by the manufacturer. Otherwise, degradation of the performance of this
equipment could result.
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
Outside ISM bands
d = 0.35 √P
0.1
0.1
0.4
1.1
3.5
150 kHz to 80 MHz 80 MHz to 800 MHz
Inside ISM bands
d = 1.2 √P
0.1
0.4
1.2
3.8
12.0
800 MHz to 2.5 GHz
d = 1.2 √P d = 2.3 √P
0.1
0.4
1.2
3.8
12.0
0.2
0.7
2.3
7.3
23.0
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