12
Guidance and Manufacturer’s Declaration – Electromagnetic Emissions
The device is intended for use in the electromagnetic environment specified below. The customer or user of the device should assure that it is used in such an environment.
Immunity Test IEC Test Level Compliance Level
Electromagnetic Environment – Guidance
Portable and mobile RF communications equipment should be used no closer to any
part of the device, including cables, than the recommended separatvion distance
calculated from the equation applicable to the frequency of the transmitter.
Recommended separation distance:
Conducted RF IEC -- Vrms, kHz to MHz Vrms
Radiated RF IEC -- V/m, MHz to . GHz V/m
d=.√P MHz to MHz
d=.√P MHz to . 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
*
, should be less than the compliance level in each frequency range
**
.
Interference may occur in the vicinity of
equipment marked with the following symbol:
At MHz and MHz, the higher frequency range applies.
These guidelines may not apply in situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects and people.
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 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
re-orienting or relocating the device.
Over the frequency range kHz to MHz, field strengths should be less than
V/m.
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