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Guidance and manufacture's declaration – electromagnetic immunity
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 con-
sidered. If the measured field strength in the location in which the BM49 blood pressure monitor is used exceeds the
applicable RF compliance level above, the BM49 blood pressure monitor should be observed to verify normal opera-
tion. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the
BM49 blood pressure monitor.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equipment and the
EQUIPMENT or SYSTEM – for EQUIPMENT or SYSTEM that are not LIFE-SUPPORTING
Recommended separation distances between portable and mobile RF communications equipment and the BM49
blood pressure monitor
The BM49 blood pressure monitor is intended for use in an electromagnetic environment in which radiated RF distur-
bances are controlled. The customer or the user of the BM49 blood pressure monitor can help prevent electromagnetic
interference by maintaining a minimum distance between portable and mobile RF communications equipment (trans-
mitters) and the BM49 blood pressure monitor as recommended below, according to the maximum output power of the
communications equipment.
Rated maximum output
power of transmitter
(W)
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in
metres (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maxi-
mum 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 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.
Separation distance according to frequency of transmitter
150 kHz to 80 MHz
d =
0.117
0.370
1.170
3.700
11.7
50
(m)
80 MHz to 800 MHz
d =
0.117
0.370
1.170
3.700
11.7
800 MHz to 2.5 GHz
d =
0.234
0.740
2.340
7.400
23.4
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