ª Field strength from fixed transmitters, such as base stations for radio
telephones and land mobile radios, amateur radio, AM and FM radio
broadcast and TV broadcast cannot be predicted theoretically with
accuracy. 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 Model 1133 Digital
Blood Pressure Monitor is used exceeds the applicable RF compliance
level above, the Model 1133 Digital 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 Model 1133 Digital Blood Pressure Monitor.
b
Over the frequency range 150KHz to 80MHz, field strength should be
less than 3 V/m.
The 1133 Digital 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 1133 Digital Blood Pressure
Monitor can help prevent electromagnetic interference by maintaining a
minimum distance between portable and mobile RF communications
equipment (transmitters) and the 1133 Digital Blood Pressure Monitor as
recommended below, according to the maximum output power of the
communications equipment.
Rated maximum
output power of
transmitter
(W)
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2.5 GHz
Separation distance according to frequency of transmitter (m)
P
V
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
5
.
3
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
5
.
3
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
7
0.01
0.117
0.117
0.233
0.1
0.369
0.369
0.738
1
1.167
1.167
2.333
10
3.689
3.689
7.379
100
11.667
11.667
23.333
Recommended separation distances between portable
and mobile RF communications equipment and the 1133
Digital Blood Pressure Monitor
22
