Dane Technologies, Inc. WheelChair Mover Owners Manual 57
7105 Northland Terrace, Minneapolis, MN 55428 / 888-544-7779 / 763-544-7779 / Fax 763-544-4234
www.danetechnologies.com 970-068 6/19/17 Rev F
Appendix: What you need to know about EMI
Caution
It is very important that you read this information
regarding the possible effects of electromagnetic
interference on your WheelChair Mover.
About Electromagnetic Interference
Electromagnetic Interference (EMI) from Radio Wave Sources
1) WheelChair Movers may be susceptible to electromagnetic interference (EMI), which
is interfering electromagnetic energy (EM) emitted from sources such as radio
stations, TV stations, amateur radio (HAM) operators, two-way radios, and cellular
phones.
2) The interferences from radio wave sources can cause the WheelChair Mover to
release its brakes, move by itself, or move in unintended directions. It can also
permanently damage the WheelChair Mover’s control system. The intensity of the
interfering EM energy can be measured in volts per meter (v/m).
3) Each WheelChair Mover can resist EMI up to certain intensity. This is called its
“immunity level.” The higher the immunity level: the greater the protection. At this
time, current technology is capable of achieving at least a 20 v/m immunity level,
which provides useful protection from the more common sources of radiated EMI.
The WheelChair Mover as shipped, configured as a standard model with no further
modifications, has an immunity level of 20 v/m.
4) There are a number of sources of relatively intense electromagnetic fields in the
everyday environment. Some of these sources are obvious and easy to avoid.
Others are not apparent and exposure is unavoidable. However, we believe that by
following the warnings listed below, your risk to EMI will be minimized.
5) The sources of radiated EMI can be broadly classified into three types:
Hand-Held Portable Transceivers. These devices have an antenna mounted
directly on the transmitting unit. Examples include citizens band (CB) radios,
“walkie-talkies,” security, fire, and police transceivers, cellular telephones, and
other personal communication devices.
Note
Some cellular telephones and similar devices
transmit signals while they are ON, even when not
being used.
Medium-Range Mobile Transceivers. Examples of these devices include those
used in police cars, fire trucks, ambulances, and taxis. These usually have the
antenna mounted on the outside of the vehicle.
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