User and Service Manual Natus® Brain Monitor & Embla Dx Series™
11
Table 3 - Electromagnetic Immunity – for EQUIPMENT and SYSTEMS that are not
LIFE-SUPPORTING
Guidance and manufacturer’s declaration – electromagnetic immunity
The Brain Monitor & Embla Dx Series Amplifiers are intended for use in the electromagnetic
environment specified below. The customer or the user of the Brain Monitor & Embla Dx Series
Amplifiers should assure that they are used in such an environment.
Electromagnetic Environment - Guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2.7 GHz
Portable and mobile RF communications
equipment should be used no closer to any part of
the Brain Monitor & Embla Dx Series
Amplifiers, 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 150kHz to 80MHz
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 separation distance in meters (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site
1
should be
less than the compliance level in each frequency
2
.
Interference may occur in the vicinity of equipment
marked with the following symbol: .
NOTE 1: At 80 MHz and 800 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.
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 Brain Monitor & Embla Dx Series Amplifiers are used exceeds the applicable RF
compliance level above, the Brain Monitor & Embla Dx Series Amplifiers should be observed to verify normal operation. If
abnormal operation is observed, additional measures may be necessary, such as re-orienting or relocating the Brain Monitor &
Embla Dx Series Amplifiers.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
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