42
N6
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 EUT is used exceeds the applicable
RF compliance level above, the EUT should be observed to verify normal operation.
If abnormal performance is observed, additional measures may be necessary, such as
re-orienting or relocating the EUT.
b. Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [V1] V / m.
Recommended Separation Distances Between Portable and Mobile RF Communications
Equipment and N6 (Combinational stimulator) monitor System.
The N6 (Combinational stimulator) system is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled. The user of the FS N6
(Combinational stimulator) system can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and the N6 (Combinational stimulator) system as recommended
below, according to the maximum output power of the communications equipment.
Rated maximum output
power (W) of transmitter
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.
Separation distance (m) according to frequency of transmitter
150 kHz to 80 MHz
0.01 0.12 0.12 0.23
80 MHz to 800 MHz 800 MHz to 2.5 GHz
0.1 0.37 0.37 0.74
1 1.17 1.17 2.33
10 3.70 3.70 7.37
100 11.70 11.70 23.30
Electromagnetic environment-guidance
Conducted RF IEC 61000-4-6
3 Vrms
150 kHz to 80 MHz
3 Vrms
3 V/m
3 Vrms
3 V/m
3 V/m
80 MHz to 2.5 GHz
Radiated RF IEC 61000-4-3
Immunity test
IEC 60601
Test level
Actual
Immunity Level
Compliance Level
43
EMC Guidance and manufacturer’s declaration
The Model N6 (Combinational stimulator) LED Light Source is intended for use in the
electromagnetic environment specified below. The customer or the user of N6
(Combinational stimulator) should assure that it is used in such an environment.
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
Portable and mobile RF communications equipment
should be used no closer to any part of the Model N6
(Combinational stimulator), including cables, than the
recommended separation distance calculated from the
equation applicable to the frequency of the transmitter.
Recommended separation distance
Recommended separation distance
Where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter
manufacturer and d is the recommended separation
distance 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) UT is the A.C. mains voltage prior to application of the test level.
Note 2) At 80 MHz and 800 MHz, the higher frequency range applies.
Note 3) These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
3 Vrms
150 kHz
to 80 MHz
3 Vrms
150 kHz
to 80 MHz
3 V/m
80.0 MHz
to 2.5 GHz
3 V/m
80.0 MHz
to 2.5 GHz
Immunity test
IEC 60601
Test level
Compliance
level
Electromagnetic environment – guidance
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