22
Table 17.3
Portable and mobile RF communications equipment
should be used no closer to any part of the device,
including cables, than the recommended separation
distance calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance:
a) Field strength 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 concentrator is used exceeds the applicable RF compliance level above, the concentrator should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as re-orienting or relocating the device.
b) Over the frequency range 150 KHZ to 80 MHZ, the field strengths should be less than 3V/m.
Where P is the maximum output power rating of the
transmitter in watts (W)according to the transmitter
manufacturer and d is the recommended separation
distance in meters (m).
Field strengths from fixed RF transmitters, as determined
by an electromagnetic site survey
a
, should be less than
the compliance level in each frequency range
b
.
Interference may occur in the vicinity of equipment
marked with the following symbol:
Guidelines and Manufacturer's Declaration-Electromagnetic Immunity
The concentrator is intended for use in the electromagnetic environment specified below. The user of the
concentrator should make sure it is used in such an environment.
Immunity Test
IEC 60601
Test Level
Compliance
Level
Electromagnetic Environment--Guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3Vrms
150kHz to 80MHz
3Vrms
3V/m
3V/m
80MHz to 2.5GHz
d ＝ 1.2 P
d ＝ 1.2 P
d ＝ 2.3 P
Note 1: At 80MHz and 800MHz, 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.
80 MHz to 800 MHz
150 kHz to 80 MHz
800 MHz to 2.5 GHz
