A&D TM-2440, Инструкция по эксплуатации

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74
Electromagnetic environment of Conducted RF and Radiated RF
We recommend that the mobile and portable RF communication
instruments are spaced from the transmitter by the recommended
separation distance
d
meters (
m
) or more. This
d
is calculated with
the frequency of the transmitter. Where
P
is the maximum output
power rating of the transmitter in watts (
W
) according to the
transmitter manufacturer. Field strengths from fixed RF
transmitters, as determined by an electromagnetic site survey as
a
,
it 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 :
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 recorder is used exceeds the applicable RF
compliance level above, the recorder should be observed to verify
normal operation. If strange performance is observed, additional
measures may be necessary, such as changing position and
direction of the recorder.
b
: Proper frequency range is
150
kHz to
80
MHz.
Proper field strengths should be less than
3
V/m.