22
Freecom Safety Manual
GB
When this Freecom external drive is being powered by an AC adaptor, the AC
adaptor and its associated AC power cord may themselves emit low levels of ELF
energy. The intensity levels of those ELF emissions however, even in close
proximity to the AC adaptor and its associated AC power cord, is relatively low
in comparison to those of other common household appliances.
The minute levels of EMF energy in the ELF range that are emitted by the AC
adaptor and its AC power cord pose no known health hazards to human beings.
2.
Radio Frequency (RF) Emissions
a. External drives generate digital timing pulses at frequencies within the RF
range, and consequently may emit minute levels of stray EMF emissions in the
RF range.
As a result, all desk-top and external drives are required to comply with the US
Federal Communications Commission (FCC) Standards for “Class B” digital
devices, the Canadian Interference-Causing Equipment Regulations and the
European Community Standards.
(“Class B” digital devices are authorized for use in residential environments and
are not permitted to intentionally emit RF energy. Nevertheless, they are
permitted to unintentionally emit low levels of RF energy, as a result of the
generation of digital timing pulses by their clock oscillator circuits).
b. The allowable levels of RF energy that may be emitted by external drives are
severely limited in their intensity by the existing FCC Regulations (47 CFR Section
15.109 (a)), Canadian ICE Regulations and European Community Standard
N55022, to prevent interference with reception on nearby radio and T.V.
receivers.
Freecom external drives have therefore been equipped with internal shielding,
to significantly reduce the stray emission of RF energy.
