Recommended Separation Distances Between Portable And Mobile Rf Communications Equipment And The Device - ResMed Astral 100 Series User Manual

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 device is used exceeds the applicable RF
compliance level above, the device should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the device.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 10 V/m.
b
Notes:
•
Ut is the AC mains voltage prior to application of the test level.
• At 80 MHz and 800 MHz, 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.
Recommended separation distances between portable and mobile RF
communications equipment and the device
These devices are 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.
Notes:
• 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.
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
d = 1.17 √P
0.12
0.37
1.17
3.70
11.70
80 MHz to 800 MHz
d = 0.35 √P
0.04
0.11
0.35
1.11
3.50
Technical specifications
800MHz to 2.5 GHz
d = 0.7 √P
0.07
0.22
0.7
2.21
7.0
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