Environmental Engineering Reference
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each type that are possible in working and limit
operation conditions. In general, test influences are
applied to circuits, connected to the power port(s)
of direct and alternating current; to unsymmetrical
and / or symmetrical connecting lines, connected
to input, output, communication ports; to ports of
protective and (if available) signal ground and to
a enclosure port (see Figure 6).
During tests of immunity to electromagnetic
disturbances, the following rules are followed
additionally to general provisions:
containing or provided in technical docu-
mentation of SHC and peripheral equip-
ment, should be used).
• Test inluences are allowed to be generated
simultaneously on several operating stand-
alone component parts of SHC, intercon-
nected by electric communication lines
(length not less than 1 m) and / or non-
electric communication lines.
• If a device has several power, ground, in-
put, output and communication ports, test
inluences are generated on each of them
individually.
• For devices that have a signiicant (more
than 5) number of identical ports or ports
with a considerable number of connecting
lines with an approval of a limited number
of such ports (lines), which are the most
sensitive to disturbances of such a type.
• Degree of test hardness is chosen consider-
ing electromagnetic environment in places
of actual and expected location of devices
during operation (qualitative features, by
• Electromagnetic environment in rooms,
where tests are executes, should not inlu-
ence their results.
• Tests are executed by turn regarding each
type of disturbances speciied in technical
speciication (immunity to a simultaneous
activity of disturbances of several types is
not checked).
• Device location, types and length of con-
necting cables should, when applicable,
meet real operation conditions (cables,
Figure 6. Example of workplace arrangement for execution of tests of disturbance immunity
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