ResMed VPAP III ST-A User Manual page 50

Guidance and manufacturer's declaration – electromagnetic immunity (Continued)
The VPAP III ST-A is intended for use in the electromagnetic environment specified below. The customer or
the user of the VPAP III ST-A should assure that it is used in such an environment.
Immunity
test
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
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 III ST-A is used exceeds the applicable RF compliance level above, the VPAP III ST-A should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the VPAP III ST-A.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 10 V/m.
42
IEC60601-1-2 Compliance
test level level
3 Vrms 3 Vrms
150 kHz to 80 MHz
10 V/m 10 V/m
80 MHz to 2.5 GHz
Electromagnetic environment –
guidance
Portable and mobile RF communications
equipment should be used no closer to any
part of the VPAP III ST-A, including cables,
than the recommended separation distance
calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
d = 1.17 √P
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
a
survey, should be less than the compliance
level in each frequency range.
Interference may occur in the vicinity of
equipment marked with the following
symbol:
b