36 Specifications
430
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 monitor is used exceeds the applicable RF compliance level above, the monitor
should be observed to verify normal operation. If abnormal performance is observed, additional
measures may be necessary, such as reorienting or relocating the monitor.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects, and people.
Recommended separation distances from portable and mobile RF
communication equipment
The monitor is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the monitor can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment and the
monitor as recommended below, according to the maximum output power of the communications
equipment.
In the following table, 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). The
values given in brackets are for respiration and BIS.
Immunity test
IEC 60601-1-2
test level
Compliance level Electromagnetic environment guidance
Conducted RF
IEC 61000-4-6
3VRMS
150 kHz to 80 MHz
3VRMS
(1 VRMS for
respiration and BIS)
Recommended separation distance:
d = 1.2√P
for respiration and BIS:
d = 3.5√P
Radiated RF
IEC 61000-4-3
3V/m
80 MHz to 2.5 GHz
3V/m
(1 V/m for respiration
and BIS)
Recommended separation distance:
80 MHz to 800 MHz
d = 1.2√P
80 MHz to 800 MHz for respiration and BIS
d = 3.5√P
800 MHz to 2,5 GHz
d = 2.3√P
800 MHz to 2,5 GHz for respiration and BIS
d = 7.0√P
2.0 to 2,3 GHz for short range radio
d = 7.0√P