12
Recommended separation distances between portable and mobile RF communications equipment and the NuTorque Lite
The NuTorque Lite is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the
NuTorque Lite can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the NuTorque Lite 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
150kHz to 80MHz
d=1.2 P
80MHz to 800MHz
d=1.2 P
800MHz to 2.5GHz
d=2.3 P
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
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.
Conducted RF
IEC61000-4-6
Radiated RF
IEC61000-4-3
3Vrms
150 kHz to 80MHz
3V/m
80MHz to 2.5 GHz
3Vrms
3V/m
Portable and mobile FRO communications equipment should be used no closer
to any part of the NuTorque Lite, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency of
the transmitter.
Recommended separation distance
d = 1.2 P
d = 1.2 P 80MHz to 800MHz
d = 2.3 P 800MHz to 2.5GHz
Where
P is the maximum output power rating of the transmitter in watts
(W)according to the transmitter manufacturer and
d is the recommended
separationdistance 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:
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 mobiles 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 NuTorque Lite is used exceeds the applicable RF
compliance level above, the NuTorque Lite should be observed to verity normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the NuTorque Lite .
b Over the frequency range 150kHz to 80MHz, field strengths should be less than 3 V/m.
Guidance and manufacturer's declaration - electromagnetic immunity
The NuTorque
®
Lite is intended for use in the electromagnetic environment specified below. The customer or the user of the NuTorque Lite and manual should
assure that it is used in such an environment.
Immunity test
IEC60601 test level
Compliance level
Electromagnetic environment - guidance
Electrostatic discharge (ESD)
IEC61000-4-2
±6kV contact
±8kV air
±6kV contact
±8kV 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
IEC61000-4-4
±2kV for power supply lines
±1kV for input/output
±2kV for power supply lines
No input/output line
Mains power quality should be that of a typical
commercial or hospital environment.
Surge IEC61000-4-5
±1kV line(s) to line(s)
±2kV line(s) to earth
±1kV line to line
±2kV lines to earth
Mains power quality should be that of a typical
commercial or hospital environment.
Voltage dips, short
interruptions and voltage
variations on power supply
input lines IEC61000-4-11
<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
<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
Mains power quality should be that of a typical
commercial or hospital environment. If the user of the
NuTorque Lite requires continued operation during power
mains interruptions, it is recommended that the NuTorque
Lite be powered from an uninterruptible power supply or
a battery.
Power frequency (50/60Hz)
magnetic field IEC61000-4-8
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.
