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930578 Rev. B
V. EMI (Electromagnetic Interference)
11
•Buddy Button
•Micro Light
•Star Board
•Wafer 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 20V/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: Customer Service Department at (800) 333-4000.
V. EMI (Electromagnetic Interference)
930578 Rev. B
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 reason, EMI from hand-held devices is of special concern.
(See C.1 pg. 9) 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 Z-500 power wheelchair with a right-hand mounted QTRONIX remote joy-
stick system, single-post height-adjustable armrests, 90º hangers, 13” seat
width, 15” seat depth and 22NF gel cell batteries.
4. The following specialty input devices have an unknown effect on the immunity
level because they have not been tested with the Z-500:
•Breath Control
•Tri-Switch Head Array
•Heavy Duty Switched Joystick
•Treadle Switch
•Ribbon Switch
•Proximity Head Array
•Z
er
o Touch Switch
•4-Zero Touch Switch
•5-Zero Touch Switch
•Disc Switch
•Proportional Head Control
•Proportional Mini-Joystick/Chin Control