EMC Guidance and Manufacturer’s Declaration 17-5
TABLE 4
RECOMMENDED SEPARATION DISTANCES BETWEEN PORTABLE AND MOBILE
RF COMMUNICATION DEVICE AND SYSTEM
The system is intended for use in an electromagnetic environment in which radiated RF
disturbance are controlled. The customer or the user of system can help prevent
electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communication equipment (transmitters) and system as recommended below,
according to the maximum output power of the communication equipment.
Rated Maximum
Output power of
Transmitter
(W)
Separation Distance According to Frequency of Transmitter
(m)
150kHz -80MHz
d＝1.2 P
80MHz-800MHz
d＝1.2 P
800MHz-2.5GHz
d＝2.3 P
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters at a maximum output power not listed above, the recommended
separation distanced in meters (m) can be determined using the formula 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.
If system image distortion occurs, it may be necessary to position system further from
sources of conducted RF noise or to install external power source filter to minimize RF
noise to an acceptable level.
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 human body.
Cable sample
No.
Name Cable length
(m)
Shield or
not
Remarks
1.
AC inlet cable for the main unit 2.5 No /
2.
Cable for power adapter 2.5 No /
3.
ECG Lead
2.9 Yes /
4.
ECG Module connecting cable 2.0 Yes /
5.
Foot-switch control cable 2.8 Yes /
6.
Probe cable 2.2 Yes All probe cables
7.
External DVD recorder
connecting cable
1.5 Yes /
8.
Video module cable 2.0 Yes /
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