17
16
Rated
maximum
output of
transmitter
W
Recommended separation distances between portable and mobile RF
communications equipment and the W203 blood pressure monitor
Separation distance according to frequency of transmitterm
The W203 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 W203 blood pressure monitor can help prevent
electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the
W203 blood pressure monitor as recommended below, according to the
maximum output power of the communications equipment
P
V
d
]
5
.
3
[
1
=
P
V
d
]
12
[
2
=
P
E
d
]
5
.
3
[
1
=
P
E
d
]
7
[
1
=
Recommended separation distances between portable and mobile
RF communications equipment and the EQUIPMENT or SYSTEM -
for EQUIPMENT and SYSTEMS
150 kHz to 80
MHz
outside ISM
and amateur
radio bands
150 kHz to 80
MHz
in ISM and
amateur radio
bands
80 MHz to 800
MHz
800 MHz to
2.7 GHz
c.Over the frequency range 150 kHz to 80 MHz, field strengths should be
less than 3V/m.
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic is
affected by absorption and reflection from structures, objects and people.
a.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. The amateur radio
bands between 0,15 MHz and 80 MHz are 1,8 MHz to 2,0 MHz, 3,5 MHz to
4,0 MHz, 5,3 MHz to 5,4 MHz, 7 MHz to 7,3 MHz, 10,1 MHz to 10,15 MHz,
14 MHz to 14,2 MHz, 18,07 MHz to 18,17 MHz, 21,0 MHz to 21,4 MHz,
24,89 MHz to 24,99 MHz, 28,0 MHz to 29,7 MHz and 50,0 MHz to 54,0
MHz.
b.Field strengths from fixed transmitters, such as base stations for radio
(cellular/cordless) 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 W203 blood pressure
monitor is used exceeds the applicable RF compliance level above, the
W203 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 W203 blood pressure
monitor.
