Indicates that incorrect operation presents possibility of injury to the
user or damage to the equipment.
NOTE
Denotes items of advice related to performance of the equipment or
to its correct operation.
Conventions used in this manual
The following symbols are used in this Instruction Manual to indicate the
relative importance of cautions and warnings.
Measurement categories (Overvoltage categories)
This instrument complies with CAT II safety requirements.
To ensure safe operation of measurement instruments, IEC 61010 establishes
safety standards for various electrical environments, categorized as CAT I to
CAT IV, and called measurement categories. These are defined as follows.
CAT
: Secondary electrical circuits connected to an AC electrical outlet
through a transformer or similar device.
CAT
: Primary electrical circuits in equipment connected to an AC electrical
outlet by a power cord (portable tools, household appliances, etc.)
CAT
: Primary electrical circuits of heavy equipment (fixed installations)
connected directly to the distribution panel, and feeders from the
distribution panel to outlets.
CAT
: The circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution
panel).
Higher-numbered categories correspond to electrical environments with
greater momentary energy. So a measurement device designed for CAT III
environments can endure greater momentary energy than a device designed
for CAT II. Using a measurement instrument in an environment designated
with a higher-numbered category than that for which the instrument is rated
could result in a severe accident, and must be carefully avoided.
Never use a CAT I measuring instrument in CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage Categories of the
IEC60664 Standards.
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