31 Installation and Specifications Safety and Performance Tests
324
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 monitor is used exceeds the applicable RF compliance level above, the monitor should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the monitor.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects, and people.
Recommended separation distances from portable and mobile RF
communication equipment
The monitor is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the monitor can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment and
the monitor as recommended below, according to the maximum output power of the communications
equipment.
In the following table, 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). The values given in brackets are for those measurements which do not use the general formula.
Electrosurgery Interference/Defibrillation/Electrostatic Discharge
The equipment returns to the previous operating mode within 10 seconds without loss of any stored
data. Measurement accuracy may be temporarily decreased while performing electro-surgery or
defibrillation. This does not affect patient or equipment safety. Do not expose the equipment to x-ray
or strong magnetic fields (MRI).
Fast Transients/Bursts
The equipment will return to the previous operating mode within 10 seconds without loss of any
stored data. If any user interaction is required, the monitor indicates with a technical alarm (INOP).
Frequency of transmitter 150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2,5 GHz
Equation
for respiration:
for respiration:
for respiration:
for short range radio in
the range 2.0 to 2.3 GHz:
Rated max. output power
of transmitter (W)
Separation distance (m) Separation distance (m) Separation distance (m)
0.01 0.1 (0.4) 0.1 (0.4) 0.2 (0.7)
0.1 0.4 (1.1) 0.4 (1.1) 0.7 (2.2)
1 1.3 (3.5) 1.3 (3.5) 2.3 (7.0)
10 3.8 (11.1) 3.8 (11.1) 7.3 (22.1)
100 12.0 (35.0) 12.0 (35.0) 23.0 (70.0)
d1,2P=
d3,5p=
d1,2P=
d3,5P=
d2,3P=
d7,0P=
d7,0P=
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