Sirona Orthophos XG Plus DS/Ceph, Руководство по эксплуатации

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Sirona Dental Systems GmbH 1 Warning and safety information
Operating Instructions ORTHOPHOS XG
Plus
DS/Ceph 1.3 About the physics of electrostatic charges
59 87 594 D 3352
D 3352.201.01.18.02
9
The transient currents resulting from these discharges
have a magnitude of 10 amperes. They are not hazard-
ous for humans because they last for only several nano-
seconds.
Voltage differentials exceeding 30,000 volts per centi-
meter may lead to a charge transfer (electrostatic dis-
charge, lightning, arc-over).
Integrated circuits (logical circuits and microprocessors)
are used in order to implement a wide variety of func-
tions in dental/X-ray/CEREC systems. The circuits must
be miniaturized to a very high degree in order to include
as many functions as possible on these chips. This leads
to structure thicknesses as low as a few ten thousandths
of a millimeter.
It is obvious that integrated circuits which are connected
to plugs leading outside of the unit via cables are sensi-
tive to electrostatic discharge. Even voltages which are
imperceptible to the user can cause breakdown of the
structures, thus leading to a discharge current which
melts the chip in the affected areas. Damage to individ-
ual integrated circuits may cause malfunction or failure
of the system.
To prevent this from happening, the ESD warning label
next to the plug warns of this hazard.
1 nanosecond = 1/1,000,000,000 second =
1 billionth of a second