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930477 Rev. A
V. EMI (Electromagnetic Interference)
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• Treadle Switch
• Ribbon Switch
• Disc Switch
• Buddy Button
• Micro Light
• Star Board
• Penta Switch
• Plate Switch
• Soft Switch
• Grasp Switch
• Wobble Switch
Individuals with physical limitations requiring the use of a specialty control
input device known not to be immune to 20 V/m, or not known, should exer-
cise extra care around known sources of EMI.
There is no way to know the effect on EMI if you add accessories or modify
this chair. Any change to your chair may increase the risk of EMI. Parts from
other suppliers have unknown EMI properties.
F. REPORT ALL SUSPECTED EMI INCIDENTS
You should promptly report any unintended movement or brake release. Be sure to
indicate whether there was a radio wave source near your chair at the time.
Contact: Sunrise Medical Customer Service Department at (800) 333-4000.
V. EMI (Electromagnetic Interference)
930477 Rev. A
10
2. Medium-Range Mobile Transceivers:
These include two-way radios used in police cars, fire trucks, 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 and
amateur (HAM) radios.
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.
D. DISTANCE FROM THE SOURCE
EM energy rapidly becomes more intense as you get closer to the source. For this rea-
son, EMI from hand-held devices is of special concern. (See C.1) A person using one
of these devices can bring high levels of EM energy very close to your chair without
you knowing it.
E. IMMUNITY LEVEL
1. The level of EM energy is measured in volts per meter (V/m). Every power wheel-
chair can resist EMI up to a certain level. This is called its “immunity level”.
2. 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.
3. The configuration tested and found to be immune to at least 20 V/m is:
Quickie S-646/S-646 SE power wheelchair with a right hand mounted QTRONIX
remote joystick system, 20” seat width, 18” seat depth, dual-post height
adjustable armrests, swing-away hangers and GP 24 gel cell batteries.
4. Specialty input devices with an unknown immunity level because the devices
were not tested with the S-646/S-646 SE and QTRONIX controller include:
• Breath Control
• Heavy Duty Switched Joystick
• Proportional Head Control
• Wafer Board
• Tri-Switch Head Array
• Proportional Mini-Joystick/Chin Control
• Proximity Head Array
• Zero Touch Switch
• 4-Zero Touch Switch
• 5-Zero Touch Switch