iv
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Safety Notes
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DANGER
Indicates that incorrect operation presents extreme danger of
accident resulting in death or serious injury to the user.
WARNING
Indicates that incorrect operation presents significant danger of
accident resulting in death or serious injury to the user.
CAUTION
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.
CAT
Ⅰ
Secondary electrical circuits that are connected to a wall outlet through a
transformer or similar device.
CAT
Ⅱ
Primary electrical circuits in equipment connected to a wall outlet via a
power cord (portable tools, household appliances, etc.)
CAT
Ⅲ
Primary electrical circuits of heavy equipment (fixed installations)
connected directly to the distribution panel, and feeders between the
distribution panel and outlets.
CAT
Ⅳ
The circuit from the service drop to the service entrance, then to the
power meter and to the primary overcurrent protection device.
The following symbols are used in this Instruction Manual to indicate the
relative importance of cautions and warnings.
Measurement categories (Overvoltage categories)
This instrument conforms to the safety requirements for CAT II (370 V)
measurement products (using with the 8936 ANALOG UNIT).
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.
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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