EMI – electromagnetic interference
Electromagnetic Interference (EMI)
From Radio Wave Sources
Motorized scooters may be susceptible to
electromagnetic interference (EMI), which is
interfering electromagnetic energy (EM) emitted
from sources such as radio stations, TV stations,
amateur radio (HAM) transmitters, two-way radios,
and cellular phones. The interference (from radio
wave sources) can cause scooters to release
their brakes, come to a sudden stop, or move in
an uncontrolled manner. It can also permanently
damage a scooter’s control system. The intensity
of the interfering EM energy can be measured in
volts per motor (V/m). Each Motorized scooter can
resist EMI up to a certain intensity. This is called
its “immunity level”. The higher the immunity level,
the greater the protection. The FDA has stated that
all newly manufactured electric mobility vehicle
models should have a resistance of at least 20
V/m, which would provide a reasonable degree
of protection from the more common sources of
radiated EMI.
Your Mantis as shipped, with no further
modification, has an immunity level of 20 V/m.
This immunity was tested with the inclusion of these
accessories: a utility basket with a spare battery-
pack and the charger unit carried inside it.
There are a number of sources of relatively
intense electromagnetic fields in the everyday
environment. Some of these sources are obvious
and easy to avoid. Others are not apparent and
exposure is unavoidable. However, we believe
that by following the warnings listed below, your
risk to EMI will be minimized.
The sources of radiated EMI can be broadly
classified into three types:
1) Hand-held portable transceivers (transmitters-
receivers) with the antenna mounted directly on
the transmitting unit. Examples include citizens
band (CB) radios, “walkie-talkies”, security, fire,
and police transceivers, cellular telephones,
and other personal communication devices.
**Note:
Some cellular telephones and similar
devices transmit signals while they are ON, even
when not being used;
2) Medium-range mobile transceivers, such
as those used in police cars, fire trucks,
ambulances, and taxis. These usually have the
antenna mounted on the outside of the vehicle;
and
3) Long-range transmitters and transceivers,
such as commercial broadcast transmitters
(radio and TV broadcast antenna towers) and
amateur (HAM) radios.
Warning: It is important that you read this information regarding the
possible effects of electromagnetic interference on your Mantis.
• The Mantis scooter might disturb the operation of devices in its
environment that emit electromagnetic fields (e.g. alarm systems,
automatic doors, etc.).
• The driving performance of the Mantis scooter can be influenced
by electromagnetic fields (e.g. those emitted by portable
telephones, electricity generators or high power sources).
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