18
to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured
field strength in the location in which the Blood Pressure Monitor is used exceeds the applicable
RF compliance level above, the Blood Pressure Monitor should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such as
re-orienting or relocating the Blood Pressure Monitor.
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
equipment and the Blood Pressure Monitor
The Blood Pressure Monitor is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the Blood Pressure Monitor
can help prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the Blood Pressure
Monitor as recommended below, according to the maximum output power of the
communications equipment.
Rated max. output
power of transmitter
(W)
Separation distance according to frequency of the transmitter (m)
150kHz to 80MHz
P
V
d
]
5
.
3
[
1
80MHz to 800MHz
P
E
d
]
5
.
3
[
1
800MHz to 2.7GHz
P
E
d
]
7
[
1
0.01
0.12
0.04
0.07
0.1
0.37
0.12
0.23
1
1.17
0.35
0.70
10
3.70
1.11
2.22
100
11.70
3.50
7.00
For transmitters rated at a maximum output power not listed above, the recommended
separation distance d in meters (m) can be estimated 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: These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects and people.
