EMC warning statement
The interference from radio wave sources such as radio stations,
TV stations, two way radios or cellular phones can cause the mo-
bility product to release its brakes, move by itself, or move in unin-
tended directions. It can also permanently damage the mobility
power chair control system.
The intensity of the interfering EM energy can be measured in
volts per meter (V/m). Each mobility product can resist EMI up
to a certain intensity. This is called the "EMI immunity level". The
higher the EMI immunity level, the greater the protection from
EMI. Currently the eFOLDi power chair has an immunity level of
at least 20V/m, which provides useful protection from the com-
mon sources of EMI.
The sources of radiated EMI can be broadly classified into three
types: 1) Hand-held portable transceivers. (normally with antenna
mounted on the device) 2) Medium-range mobile transceivers,
such as those used in police cars, fire trucks, ambulances and
taxis. (normally with antenna mounted on the vehicle) 3) Long-
range transmitters and transceivers, such as commercial broad-
cast transmitters (radio and TV broadcast antenna towers) and
amateur (HAM) radios.
Other types of hand-held devices, such as cordless phones, lap-
top computers, AM/FM radios, TV sets and small appliances such
as electric shavers and hair dryers are usually not likely to cause
EMI problems.
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