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7. Electromagnetic Interference (EMI)
Electromagnetic interference (EMI) may occur on your
Powerchair, by the electromagnetic energy from radio
stations, TV broadcasters, FM signal emitters, two-way
wireless power sources and mobile phones. EMI will cause
the control system of the Powerchair to lose function,
leading to unintended start-up or random movements. In
addition to the possibilities of accidental damage and
injuries, EMI may cause permanent damage to the control
system. All Powerchairs resist a certain degree of
electromagnetic waves, i.e. immunity level, and have
passed EMI testing of 20 V/m (the unit of measure for
electromagnetic force) which means that it is immune to
the possible and negative effects caused by typical EMIs.
Some of the electromagnetic fields can be avoided
easily but some are not. You can reduce the risks of EMIs
to minimum by gaining of the knowledge shown below:
● EMI is generated by three major sources:
1.Mobile radio transceiver (antennae attached)
For example, the transmission unit in the handheld
transceivers used by traffic police or rescuers as well
as the mobile phones and personal communication
devices on the market are all examples of EMI sources.
Note:
Electromagnetic signals are typically emitted from
transceivers when the power is turned on or during
use.
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