Safety Information
3
Measurement categories (Overvoltage categories)
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.
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.
Other symbols
Indicates a prohibited action.
*
Indicates that descriptive information is provided below.
PAGE
UP
(Bold characters)
Bold characters within the text indicate operating key labels.
(p. #)
Indicates the location of reference information.
CAT I
Secondary electrical circuits connected to an AC electrical
outlet through a transformer or similar device.
CAT II
Primary electrical circuits in equipment connected to an AC
electrical outlet by a power cord (portable tools, household
appliances, etc.)
CAT II covers directly measuring electrical outlet receptacles.
CAT III
Primary electrical circuits of heavy equipment (fixed
installations) connected directly to the distribution panel, and
feeders from the distribution panel to outlets.
CAT IV
The circuit from the service drop to the service entrance, and
to the power meter and primary overcurrent protection device
(distribution panel).
Содержание SM7810
Страница 19: ...2 5 Turning the Power On and Off 16 ...
Страница 51: ...5 3 Internal Circuitry 48 ...
Страница 65: ...7 4 Cleaning 62 ...