ResMed III user manual Portable and mobile RF communications

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	Compliance	Electromagnetic environment –
test	test level	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
Conducted RF	3 Vrms	3 Vrms	d = 1.17 √ P
IEC 61000-4-6	150 kHz to 80 MHz
Radiated RF	10 V/m	10 V/m	d = 0.35 √ P 80 MHz to 800 MHz
IEC 61000-4-3	80 MHz to 2.5 GHz
			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,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: 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.

aField 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.

bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 10 V/m.

System Specifications 41