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Symbols
The following symbols are used and marked on the instrument and in this
instruction manual. Please carefully check before starting to use the
instrument.
Double or reinforced insulation
User must refer to the explanations in the instruction
#
manual.
Earth
Danger of possible electrical shock
Do not use on AC electric systems exceeding 660 V.
Complies with WEEE Directive (20 02/ 9 6/ EC)
marking requirements. (valid in each EU country)
Measurement Category
To ensure safe operation of measuring instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as O to CAT
IV, and called measurement categories. Higher-numbered categories
correspond to electrical environments with greater momentary energy, so a
measuring instrument designed for CAT III environments can endure greater
momentary energy than one designed for CAT II.
O
: C ircuits which are not directly connected to the mains power
(None, other)
supply.
CAT II
: E lectrical circuits of equipment connected to an AC electrical
outlet by a power cord.
CAT III
: P rimary electrical circuits of the equipment connected directly
to the distribution panel, and feeders from the distribution panel
to outlets.
CAT IV
: T he circuit from the service drop to the service entrance, and
to the power meter and primary overcurrent protection device
(distribution panel).
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