Vaisala WAA151 Installation Manual Page 61

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Chapter 2 ___________________________________________________________Product Overview
VAISALA ________________________________________________________________________ 59
A circuit works at the designated voltage without disturbance. A
damaging voltage is any voltage increase, which leads to an exceeding
of the tolerance threshold of the nominal voltage. This includes
transient surge voltages arising as a result of switching operations and
lightning discharge and inductive, galvanic or capacitive coupling in
an electric system. Transient surge voltages have a very quick rise
times of a few µs and relatively slow decay times ranging from several
10 µs to several 100 µs.
Damage caused by surge voltage can be avoided by very quickly
short-circuiting the conductors. For example, when high voltages
occur with the equipotential bonding, but only for the moment in
which the surge voltage is present.
Handheld Terminal
Figure 51 QMD101 Handheld Terminal
QMD101 is a lightweight, rugged and easy-to-read handheld display
device for viewing measured and calculated parameters and systems
alarms, as well as for setting station-specific parameters.
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