Laerdal CPRmeter - Manual (Page 30)

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† The ISM (industrial, scientific and medical) bands between 150 kHz and 80 MHz are
6,765 MHz to 6,795 MHz; 13,553 MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz;
and 40,660 MHz to 40,700 MHz.
‡ 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
CPRmeter is used exceeds the applicable RF compliance level above, the CPRmeter
should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orienting or relocating the CPRmeter.
Recommended separation distances between portable and mobile
RF communications equipment and the CPRmeter
The CPRmeter is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the CPRmeter
can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the
CPRmeter as recommended below, according to the maximum output power of the
communications equipment.
Electromagnetic Emmissions
Rated maximum output Separation distance according to frequency of
power of transmitter (W) transmitter (M)
80 MHz to 800 MHz 800 MHz to 2.5 GHz
d= 1.2 √P d= 2.3 √P
0,23
0,72
2,3
7,28
23
0,12
0,38
1,2
3,8
12
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the
recommended separation distance d in meters (m) can be determined using the
equation applicable to the frequency of the transmitter, where P is the maximum
output power rating of the transmitter in watts (W) according to the transmitter
manufacturer.
NOTE: 1. At 80 MHz and 800 MHz, the separation distance for the higher frequency range
applies.
NOTE 2. The ISM (industrial, scientific and medial) bands between 150 kHz and 80 MHz
are 6,765 MHz to 6,795 MHz; 13,553 MHz to 13, 567 MHz; 26,957 MHz to
27,283 MHz; and 40,660 MHz to 40,700 MHz.
NOTE 3. An additional factor of 10/3 is used in calculating the recommended separation
distance for transmitters in the ISM frequency bands between 150 kHz and 80 MHz
and in the frequency range 80 MHz to 2.5 GHz to
decrease the likelihood that mobile/portable communications equipment could cause
interference if it is inadvertently brought into patient areas.
NOTE 4. These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects and people
NOTE 5. Transmitters/antennas of this power-level are most likely mounted on an
emergency vehicle chassis. The distances cited here are for open field. For an external
antenna, the separation distance is most likely shorter.