APT-1 – User’s Manual (EU) Rev. 2019-01 en for il 21
11. EMI – ELECTROMAGNETIC INTERFERRENCE
CAUTION: It is important that you read this information regarding the pos-
sible effects of electromagnetic interference on your APT-1.
Electromagnetic Interference (EMI) From Radio Wave Sources
The equipment 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 equipment to come to a sudden stop, or react in an uncontrolled
manner. It can also permanently damage the equipment's control system.
There are a number of sources of relatively intense electromagnetic
fields in the everyday environment. Some of these sources are obvi-
ous and easy to avoid. Others are not apparent and exposure is una-
voidable. 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 an-
tenna mounted directly on the transmitting unit. Examples include citi-
zens band (CB) radios, "walkie-talkies”, security, fire, and police trans-
ceivers, cellular telephones, and other personal communication de-
vices.
**NOTE: 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 an-
tenna mounted on the outside of the vehicle; and
3) Long-range transmitters and transceivers, such as commercial
broadcast transmitters (radio and TV broadcast antenna towers) and
amateur (HAM) radios.
NOTE: Other types of hand-held devices, such as cordless phones, laptop
computers, AM/FM radios, TV sets, CD players, and 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 the equipment.
Because EM energy rapidly becomes more intense as one moves closer to
the transmitting antenna (source), the EM fields from hand-held radio wave
sources (transceivers) are of special concern. It is possible to unintention-
ally bring high levels of EM energy very close to the equipment’s control
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