C.sources Of Emi; D.distance From The Source; Immunity Level; Report All Suspected Emi Incidents - Quickie QM-710 Owner's Manual

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C. SOURCES OF EMI
The sources of EMI fall into three broad types:
1. Hand-Held Transceivers:
The antenna is usually mounted directly on the unit. These include:
• Citizens band (CB) radios
• "Walkie-talkies"
• Security, fire and police radios
• Cellular phones
• Lap-top computers with phone or fax
• Other personal communication devices
Q-NOTE– These devices can transmit signals while they are on,
even if not in use.
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 reason, EMI from hand-held devices is of special
concern. (See C.1 above) 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 is measured in volts per meter (V/m). Every
power wheelchair 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 QM-710 power wheelchair with a right-
hand mounted RNET remote joystick system, 18" seat width,
18" seat depth, dual post height adjustable armrests, fixed
tapered legrests with one piece solid footplate, and Gp 24 gel
cell batteries.
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4. The following specialty input devices have an unknown effect on
the immunity level because they have not been tested with the
QM-710/715HD/720 and RNET control system:
• Breath Control
• Proportional Head
Control
• Tri-Switch Head Array
• Proportional Mini-
Joystick/Chin Control
• Heavy Duty Switched
Joystick
• Buddy Button
• Treadle Switch
• Micro Light
• Ribbon Switch
Individuals with physical limitations requiring the use of
a specialty control input device known not to be
immune to 20V/m, or not known, should exercise 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 not specifically
tested or 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.
G. EMI FROM CHAIR
The chair itself can disturb the performance of electromagnetic
fields such as emitted by alarm systems of shops.
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• Star Board
• Proximity Head Array
• Wafer Board
• Zero Touch Switch
• Penta Switch
• 4-Zero Touch Switch
• Plate Switch
• 5-Zero Touch Switch
• Soft Switch
• Disc Switch
• Grasp Switch
• Wobble Switch
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