Invacare TDXSP2V Owners Manual - Page 27

Electromagnetic Compatibility EMC, Information

Get Invacare TDXSP2V PDF manuals and user guides View all Invacare TDXSP2V manuals
Add to My Manuals
Save this manual to your list of manuals

Page 27 highlights

3 Electromagnetic Compatibility (EMC) Information 3.1 Electromagnetic Interference (EMI) From Radio Frequency Sources Powered wheelchairs and motorized scooters (in this text, both will be referred to as mobility devices) 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) transmitters, two way radios, and cellular phones. The interference (from radio wave sources) can cause the mobility devices to release its brakes, move by itself, or move in unintended directions. It can also permanently damage the mobility devices control system. The intensity of the interfering EM energy can be measured in volts per meter (V/m). Each powered mobility device can resist EMI up to a 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 would provide useful protection from the more common sources of radiated EMI. 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. The sources of radiated EMI can be broadly classified into three types: 60101877-B Electromagnetic Compatibility (EMC) Information 1. Hand-held Portable transceivers (transmitters/receivers with the antenna mounted directly on the transmitting unit. Examples include: citizens band (CB) radios, "walkie talkie", security, fire and police transceivers, cellular telephones, and other personal communication devices). Some cellular telephones and similar devices transmit signals while they are ON, even when not being used. 2. Medium-range mobile transceivers, such as those used in police cars, fire trucks, ambulances and taxis. These usually have the antenna mounted on the outside of the vehicle. 3. Long-range transmitters and transceivers, such as commercial broadcast transmitters (radio and TV broadcast antenna towers) and amateur (HAM) radios. Other types of handheld devices, such as cordless phones, laptop computers, AM/FM radios, TV sets, CD players, cassette players, and small appliances, such as electric shavers and hair dryers, so far as we know, are not likely to cause EMI problems to your powered mobility device. 3.2 Powered Wheelchair Electromagnetic Interference (EMI) Because EM energy rapidly becomes more intense as one moves closer to the transmitting antenna (source), the EM fields from handheld radio wave sources (transceivers) are of special concern. It is possible to unintentionally bring high levels of EM energy very close to the mobility devices control system while using these devices. This can affect the 27

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
Electromagnetic Compatibility (EMC) Information
3
Electromagnetic Compatibility (EMC)
Information
3.1
Electromagnetic Interference (EMI) From
Radio Frequency Sources
Powered wheelchairs and motorized scooters (in this text,
both will be referred to as mobility devices) 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) transmitters, two way radios, and cellular phones.
The interference (from radio wave sources) can cause the
mobility devices to release its brakes, move by itself, or
move in unintended directions. It can also permanently
damage the mobility devices control system. The intensity
of the interfering EM energy can be measured in volts per
meter (V/m). Each powered mobility device can resist EMI
up to a 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 would provide useful
protection from the more common sources of radiated EMI.
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.
The sources of radiated EMI can be broadly classified into
three types:
1.
Hand-held Portable transceivers (transmitters/receivers
with the antenna mounted directly on the transmitting
unit. Examples include: citizens band (CB) radios,
“walkie talkie”, security, fire and police transceivers,
cellular telephones, and other personal communication
devices).
Some cellular telephones and similar devices
transmit signals while they are ON, even when
not being used.
2.
Medium-range mobile transceivers, such as those used
in police cars, fire trucks, ambulances and taxis. These
usually have the antenna mounted on the outside of
the vehicle.
3.
Long-range transmitters and transceivers, such as
commercial broadcast transmitters (radio and TV
broadcast antenna towers) and amateur (HAM) radios.
Other types of handheld devices, such as cordless
phones, laptop computers, AM/FM radios, TV sets,
CD players, cassette players, and small appliances,
such as electric shavers and hair dryers, so far as we
know, are not likely to cause EMI problems to your
powered mobility device.
3.2
Powered Wheelchair Electromagnetic
Interference (EMI)
Because EM energy rapidly becomes more intense as one
moves closer to the transmitting antenna (source), the EM
fields from handheld radio wave sources (transceivers) are
of special concern. It is possible to unintentionally bring
high levels of EM energy very close to the mobility devices
control system while using these devices. This can affect the
60101877-B
27