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11 Electromagnetic compatibility (IEC60601-1-2)
Guidance and manufacturer’s declaration - electromagnetic immunity
KOWA VX-20 is intended for use in the electromagnetic environment specied below.
The customer or the user of KOWA VX-20 should assure that it is used in such an environment.
Immunity test IEC 60601 test level Compliance level Electromagnetic environment– guidance
Conducted RF
IEC 61000-4-6
EN 61000-4-6
Radiated RF
IEC 61000-4-3
EN 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2.5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications
instrument should be used no closer to any
part of KOWA VX-20, including cables, than
the recommended separation distance cal-
culated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance
d=1.2 P
d=1.2 P 80 MHz to 800 MHz
d=2.3 P 800 MHz to 2.5 GHz
where P is the maximum output power rat-
ing of the transmitter in watts (W) according
to the transmitter manufacturer and d is the
recommended separation distance in metres
(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 in-
strument marked with the following symbol:
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 reection from
structures, objects and people.
a Field strengths from xed 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 elec-
tromagnetic environment due to xed RF transmitters, an electromagnetic site survey should be considered. If the measured eld
strength in the location in which KOWA VX-20 is used exceeds the applicable RF compliance level above, KOWA VX-20 should
be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-
conguring or relocating KOWA VX-20
b Over the frequency range 150kHz to 80MHz, eld strengths should be less than 3 V/m.
Recommended separation distances between
portable and mobile RF communications instrument and KOWA VX-20
KOWA VX-20 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The
customer or the user of KOWA VX-20 can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications instrument (transmitters) and KOWA VX-20 as recommended below,
according to the maximum output power of the communications instrument.
Rated maximum output
power of transmitter
W
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz
d=1.2
P
80 MHz to 800 MHz
d=1.2 P
800 MHz to 2.5 GHz
d=2.3 P
0.01 0.12 0.12 0.23
0.1 0.37 0.37 0.74
1 1.2 1.2 2.3
10 3.7 3.7 7.4
100 12 12 23
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 80MHz and 800MHz, 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 reection from
structures, objects and people.