Safety Information
4
Symbols for various standards
Other Symbols
Screen display
The screen of this instrument displays characters in the following manner.
Accuracy
We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values, with the
following meanings:
For example accuracy calculations, see "Appendix 3 Example Accuracy Calculations" (p. A4).
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various elec-
trical environments, categorized as CAT II to CAT IV, and called measurement categories.
This instrument conforms to the safety requirements for CAT II 1000 V, CAT III 600 V measuring instruments.
Indicates the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in EU member
states.
This symbol indicates that the product conforms to regulations set out by the EC Directive.
(p. ) Indicates the location of reference information.
SET
(Boldface)
Bold-faced alphanumeric characters in the text indicate characters shown on the operation keys and
display panel.
f.s. (range) This is usually the name of the currently selected range.
rdg. (reading or displayed value) The value currently being measured and indicated on the measuring instrument.
dgt. (resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the input val-
ue that causes the digital display to show a "1" as the least-significant digit.
• Using a measuring instrument in an environment designated with a higher-num-
bered category than that for which the instrument is rated could result in a severe
accident, and must be carefully avoided.
• Using a measuring instrument without categories in an environment designated with
the CAT II to CAT IV category could result in a severe accident, and must be carefully
avoided.
CAT II
When directly measuring the electrical outlet recepta-
cles of the primary electrical circuits in equipment con-
nected to an AC electrical outlet by a power cord
(portable tools, household appliances, etc.)
CAT III
When measuring the primary electrical circuits of
heavy equipment (fixed installations) connected di-
rectly to the distribution panel, and feeders from the
distribution panel to outlets
CAT IV
When measuring the circuit from the service drop to
the service entrance, and to the power meter and pri-
mary overcurrent protection device (distribution panel)
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