12©2006 Sunrise Medical
INTRODUCTION
Sources of EMI
1. Hand-Held Transceivers: The antenna is usually mounted directly on the unit.
These include:
Citizens band (CB) radios•
“Walkie-talkies”•
Security, fi re and police radios•
Cellular phones•
Lap top computers with phone or fax•
Other personal communication devices•
Note - These devices can transmit signals while they are on, even if not in use. The
wheelchair should be switched off when not in use.
2. Medium-Range Mobile Transceivers: These include two-way radios used in police
cars, fi re engines, ambulances and taxi cabs. The antenna is usually mounted on
the outside of the vehicle.
3. Long-Range Transceivers: These include commercial radio and TV broadcast
antenna towers, amateur (HAM) radios and alarm systems in department stores.
NOTE- The following are Not likely to cause EMI problems: Lap-top computers
(without phone or fax), cordless phones, TV sets or AM/FM radios, CD or tape
players.
EM energy rapidly becomes more intense as you get closer to the source. For
this reason, EMI from handheld devices is of special concern. A person using one
of these devices can bring high levels of EM energy very close to a power chair
without the user’s knowledge.
Immunity level
The level of EM is measured in volts per metre (V/m). Every power wheelchair can
resist EMI up to a certain level. This is called its “immunity level”. The higher the
immunity level, the less the risk of EMI. It is believed that a 20 V/m immunity level will
protect the power wheelchair user from the more common sources of radio waves.
The confi guration tested and found to be immune to at least 20 V/m is: QuickieRhythm
and Groove power wheelchairs with a right-handed mounted joystick system, 18” seat
width, 18” seat depth, dual-post height-adjustable armrests, fi xed tapered legrests
with one-piece solid footplate and Gp 24 gel cell batteries.
The following dealer installed speciality input devices have an unknown effect on the
immunity level because they have not been tested with the Delphi control system:
Breath Control (“Sip n Puff”)•
Tri-Switch Head Array•
Proximity Head Array•
Proportional Mini-Joystick/Chin Control•
Buddy Button•
Wafer Board•
To Next Page
Loading...
Need help?
General
