ResMed VPAP III User Manual page 48

Guidance and manufacturer's declaration – electromagnetic immunity (Continued)
The VPAP is intended for use in the electromagnetic environment specified below. The customer or the
user of the VPAP should assure that it is used in such an environment.
Immunity IEC60601-1-2
test test level
Conducted RF 3 Vrms
IEC 61000-4-6 150 kHz to 80 MHz
Radiated RF 10 V/m
IEC 61000-4-3 80 MHz to 2.5 GHz
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.
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 VPAP is used exceeds the applicable RF compliance level above, the VPAP should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as
reorienting or relocating the VPAP .
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 10 V/m.
Compliance Electromagnetic environment –
level guidance
Portable and mobile RF communications
equipment should be used no closer to any
part of the VPAP , including cables, than the
recommended separation distance
calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
3 Vrms d = 1.17 P
10 V/m d = 0.35 P 80 MHz to 800 MHz
d = 0.70 P 800 MHz to 2.5 GHz
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,
level in each frequency range.
Interference may occur in the vicinity of
equipment marked with the following
symbol:
a
should be less than the compliance
b
System Specifications 41