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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 re-orienting or relocating the Device.
d Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended Separation Distances between Portable and Mobile RF Communications device
and This Device:
The device is intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The user of the device can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications device (transmitters)
and this device as recommended below, according to the maximum output power of the communications
device.
Rated Maximum
Output Power of
Transmitter (W)
Separation Distance According to Frequency of Transmitter
150 kHz to 80 MHz
(outside
ISM
bands)
d=0.35
P
150 kHz to 80 MHz
(in 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
0.035m
0.12m
0.12m
0.23m
0.1
0.11m
0.38m
0.38m
0.73m
1
0.35m
1.2m
1.2m
2.3m
10
1.1m
3.8m
3.8m
7.3m
100
3.5m
12m
12m
23m
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.
• 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.
• 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 device could cause interference if it is
inadvertently brought into patient areas.
• These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
