Safety Information
5
We define measurement tolerances in terms of f.s. (full scale) with the following
meanings:
f.s. (maximum display value or scale length)
The maximum displayable value or scale length. This is usually the name of the
currently selected range.
This 8423's unit 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 II to
CAT IV, and called measurement categories. These are defined as follows.
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.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV
measurement applications could result in a severe accident, and must be care-
fully avoided.
Notation
Indicates a prohibited action.
Indicates quick references for operation and remedies for troubleshooting.
*
Indicates that descriptive information is provided below.
Accuracy
Measurement Categories
CAT II Primary electrical circuits in equipment connected to an AC elec-
trical outlet by a power cord (portable tools, household appli-
ances, 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 (distri-
bution panel).
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