In Europe, all electrical and electronic equipment placed on the market must therefore comply with the
basic safety requirements of the EMC Directive. According to the Directive, electromagnetic compatib-
ility is the ability of an apparatus, system or system to work satisfactorily in the electromagnetic envir-
onment without itself causing electromagnetic interference that would be unacceptable to all equip-
ment, systems or systems in this environment.
In addition to the legal requirements described above, the reliable function of electrical equipment is
also an essential quality feature of such equipment. In addition to basic information on electromag-
netic compatibility, the following pages describe the implementation of the requirements of EMC for
the handheld terminals of the product line CDSA-D3-RV.
15.1
Electromagnetic environment - sources of interference, interference
sinks and coupling paths
The electromagnetic environment contains a large number of artificial and natural sources of interfer-
ence, which can influence electrical and electronic equipment.
The most common natural disruption phenomenon is atmospheric discharge (lightning discharge).
Artificial sources of interference are on one hand intended, such as mobile telephones, ham radio,
television and radio transmitters, and on the other hand unintended, such as microwave ovens, arc
welding, ignition systems, high-voltage systems, electric motors and electronic devices or electrostatic
discharges.
15.1.1
Atmospheric discharges (lightning)
Atmospheric discharges can be directly or indirectly on supply or communication lines. The result of
such impacts is, in the event of insufficient protection, the destruction of electrical equipment.
Atmospheric discharges are simulated in accordance with the international test standard
IEC 61000-4-5 (for Europe EN 61000-4-5) - Testing the interference immunity to impulse voltages.
The applicable international product standard IEC 61131-2 (for Europe EN 61131-2) classifies the
areas of application into zones. Depending on the applicable zone, higher or lower noise levels can be
expected. All Festo control systems and also the products from the handheld CDSA-D3-RV are suitable
for use in zone B.
The product standard requires that the interference immunity to impulse voltages be tested in accord-
ance with IEC 61000-4-5.
15.1.2
Electrostatic discharge (ESD)
Materials can be charged by touching and then separating materials. The effect only occurs if at least
one of the two materials is a non-conductor. As a result, a rapid discharge can occur if a charged con-
ductor or a conductor changed by the influence of an electrostatic field comes into the vicinity of a
metallic object.
The possible voltages between the charged bodies after charging reach values of more than 10 kV.
The most common occurrence of electrostatic discharge occurs between people and metallic bodies.
Since discharges of less than 3500 V are practically imperceptible and electronic components are
already damaged at lower voltages, ESD damage to electronic components often occurs undetected.
The international standard IEC 61000-4-2 (for Europe EN 61000-4-2) is used for metrological simula-
tion of the electrostatic discharge. The international product standard IEC 61131-2 (in Europe
EN 61131-2) for programmable logic controllers requires testing in accordance with IEC 61000-4-2 and
specifies the severity of testing.
Appendix: Electromagnetic compatibility
58
Festo — CDSA-D3-RV — 2020-08
