ResMed 248551/1, 2011-09 manual Vrms

Voltage dips,	<5% Ut (>95% dip in	< 12 V (>95% dip in	Mains power quality should be that of a typical
short	Ut) for 0.5 cycle	240V) for 0.5 cycle	commercial or hospital environment.
interruptions	40% Ut (60% dip in	96 V (60% dip in	If the user of the device requires continued
and voltage			operation during power mains interruptions, it is
	Ut) for 5 cycles	240 V) for 5 cycles
variations on			recommended that the device be powered from
	70% Ut (30% dip in	168 V (30% dip in
power supply			an uninterruptible power source.
input lines	Ut) for 25 cycles	240 V) for 25 cycles
IEC 61000-4-11	<5% Ut (>95% dip in	<12 V (>95% dip in
	Ut) for 5 sec	240 V) for 5 sec
Power	3 A/m	3 A/m	Power frequency magnetic fields should be at
frequency			levels characteristic of a typical location in a
(50/60 Hz)			typical commercial or hospital environment.
magnetic field
IEC 61000-4-8
			Portable and mobile RF communications
			equipment should be used no closer to any part
			of the device, 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	3 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 metres (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 AC 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 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 device is used exceeds the applicable RF compliance level above, the device should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the device.

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

Recommended separation distances between portable and mobile RF communications equipment and the device

The device is intended for use in an environment in which radiated RF disturbances are controlled. The customer or the user of the device can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the device as recommended below, according to the maximum output power of the communications equipment.

	Separation distance according to frequency of transmitter (m)
Rated maximum output	150 kHz to 80 MHz	80 MHz to 800 MHz	800 MHz to 2.5 GHz
power of transmitter (W)	d = 1.17 √P	d = 0.35 √P	d = 0.7 √P
0.01	0.17	0.04	0.07
0.1	0.37	0.11	0.22
1	1.17	0.35	0.7

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Technical specifications 29