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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 specified 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
Conducted RF
3 Vrms
IEC 61000-4-6
150 kHz to 80 MHz
EN 61000-4-6
Radiated RF
3 V/m
IEC 61000-4-3
80 MHz to 2.5 GHz
EN 61000-4-3
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.
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 elec-
tromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field
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-
configuring or relocating KOWA VX-20
b Over the frequency range 150kHz to 80MHz, field strengths should be less than 3 V/m.
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
0.01
0.1
1
10
100
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 reflection from
structures, objects and people.
70
Compliance level
3 Vrms
3 V/m
Recommended separation distances between
Separation distance according to frequency of transmitter
150 kHz to 80 MHz
d=1.2
P
0.12
0.37
1.2
3.7
12
Electromagnetic environment– guidance
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:
m
80 MHz to 800 MHz
d=1.2
P
0.12
0.37
1.2
3.7
12
800 MHz to 2.5 GHz
d=2.3
P
0.23
0.74
2.3
7.4
23
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