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Specifications
90
Table 17: Electromagnetic Immunity
The N-550B is intended for use in the electromagnetic environment specified
below. The customer or user of the N-550B should assure that it is used in such an
environment.
IEC 60601
Immunity Test
Test Level
Conducted RF
3 Vrms
IEC 61000-4-6
150 kHZ to
80 MHz
Radiated RF
3 V/m
IEC 61000-4-3
80 MHz to
2.5 GHz
Recommended separation distance
should be less than the compliance level in each frequency range.
Interference may occur in the vicinity of equipment marked with this
symbol:
NOTE 1: At 80 MHz, 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 strength 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
which the N-550B is used exceeds the applicable RF compliance level above, the
N-550B should be observed to verify normal operation. If abnormal performance
is observed, additional measures may be necessary, such as reorienting or
relocating the N-550B.
b
Over the frequency range 150 kHz to 80 MHz, field strength should be less than
3 V/m.
Compliance
Electromagnetic
Level
Environment — Guidance
3 Vrms
Portable and mobile RF
communications equipment
should be used no closer to
any part of the N-550B,
including cables, than the
3 V/m
recommended separation
distance calculated from 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 and d is the
recommended separation distance in meters (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,
a
b
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