Appendix B EMC Guidance and Manufacturer’s Declaration
Basic User Manual 147
Immunity
Test
IEC 60601
Test Level
Compliance
Level
Electromagnetic Environment and
Guidance
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 considered. If the measured field
strength in the location in which the EQUIPMENT is used exceeds the applicable RF compliance
level above, the EQUIPMENT should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as re-orienting or relocating
the EQUIPMENT.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
B.3 Recommended Separation Distances between Portable and
Mobile RF Communications Equipment and the Equipment
The equipment is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the equipment can help prevent
electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communications equipment (transmitters) and the equipment as recommended
below, according to the maximum output power of the communications equipment.
Rated Maximum
Output Power of
Transmitter (W)
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2.5 GHz
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in meters (m) can be estimated 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: These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects and people.
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