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 MFT-9 is
used exceeds the applicable RF compliance level above, the MFT-9 should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the MFT-9.
b. Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Guidance and manufacturer’s declaration – electromagnetic immunity
The MFT-9 is intended for use in the electromagnetic environment specified below. The customer or the user of the MFT-9 should assure that it is
used in such an environment.
Immunity test
IEC 60601 test level
Compliance level
Electromagnetic environment
–
guidance
Electrostatic
discharge (ESD)
IEC 61000-4-2
6 kV contact
8 kV air
6 kV contact
8 kV air
Floors should be wood, concrete or ceramic tile. If floors are
covered with synthetic material, the relative humidity should be at
least 30 %.
Electrical fast
transient/burst
IEC 61000-4-4
2 kV for power supply lines
1 kV for input/output lines
Not applicable
Mains power quality should be that of a typical commercial
or hospital environment.
Surge
IEC 61000-4-5
1 kV line(s) to line(s)
2 kV line(s) to earth
Not applicable
Mains power quality should be that of a typical commercial
or hospital environment.
interruptions and
voltage variations
on power supply
input lines
IEC 61000-4-11
<5 % UT
(>95 % dip in UT)
for 0,5 cycle
40 % UT
(60 % dip in UT)
for 5 cycles
70 % UT
(30 % dip in UT)
for 25 cycles
<5 % UT
(>95 % dip in UT)
for 5 sec
Not applicable
Mains power quality should be that of a typical commercial
or hospital environment. If the user of the MFT-9 requires
continued operation during power mains interruptions, it is
recommended that the MFT-9 be powered from an
uninterruptible power supply or a battery.
Power frequency
(50/60 Hz)
magnetic field
IEC 61000-4-8
3 A/m
3 A/m
Power frequency magnetic fields should be at levels
characteristic of a typical location in a typical commercial or
hospital environment.
NOTE UT is the a.c. mains voltage prior to application of the test level.
Recommended separation distances between
portable and mobile RF communications equipment and the ME EQUIPMENT or ME SYSTEM
The MFT-9 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of
the MFT-9 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and the MFT-9 as recommended below, according to the maximum output power of the communications equipment.
Rated maximum output power
of transmitter
W
Separation distance according to frequency of transmitter
m
150 kHz to 80 MHz
d =
1,2
80 MHz to 800 MHz
d =
1,2
800 MHz to 2,5 GHz
d =
2,3
0,01
N/A
0,12
0,23
0,1
N/A
0,38
0,73
1
N/A
1,2
2,3
10
N/A
3,8
7,3
100
N/A
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance
d
in meters (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 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 people.
