13
Immunity test
IEC 60601-1-2
IEC 60601-1-2
Electromagnetic environment – guidance
Test level
Compliance 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 to2.5 GHz
3 Vrms,
150KHz to 80 MHz
3 V/m,
80 MHz to 2.5 GHz
Portable and mobile RF communications
equipment should be used no closer to any part
of the Ultrasound Table, 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 150 KHz to 80 MHz
d = 1.2! P 80 MHz to 800 MHz
d = 2.3! P 800 MHz to 2.5 GHz
where P is the maximum output power rating of
the transmitter in watt (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 reflections from
structures, objects and people.
a
Field strength from mixed transmitters, such as base stations for radio telephones and land mobile radios, amateur radio, AM
or FM 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 Ultrasound Table is used exceeds the applicable RF compliance levels above, the Ultrasound Table should be observed
to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or
relocating the Ultrasound Table.
b
Over the frequency range 150 KHz to 80 MHz, field strengths should be less than 3 V/m.