Patient Monitor User Manual EMC Information
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NOTE 1
At 80 MHz and 800 MHz, 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.
a
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
Patient Monitor is used exceeds the applicable RF compliance level above, the Patient
Monitor should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the
Patient Monitor.
b
Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
A2.4 Recommended Separation Distances
Recommended separation distances between
portable and mobile RF communications equipment and the monitor
The monitor is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the monitor can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the monitor as recommended below,
according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter(m)
Rated maximum
output power of
transmitter
(W)
150 kHz to 80 MHz
P
V
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
5
.
3
80 MHz to 800 MHz
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
5
.
3
800 MHz to 2.5 GHz
P
E
d
⎥
⎦
⎤
⎢
⎣
⎡
=
1
7
0.01
0.12 0.12 0.23
0.1
0.36 0.37 0.74
1
1.16 1.17 2.33
10
3.69 3.69 7.38
100
11.67 11.67 23.33
For transmitters rated at a maximum output power not listed above, the recommended
separation distance d in metres (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.
