Safety Information
7
Accuracy
We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and
dgt. (digit) values, with the following meanings:
Measurement categories
This instrument complies with CAT IV (300 V AC/DC), CAT III (600 V AC/DC) 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.
Using a measurement instru-
ment in an environment desig-
nated 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 instru-
ment that is not CAT-rated in
CAT II to CAT IV measurement
applications could result in a
severe accident, and must be carefully avoided.
f.s.
(maximum display value or scale length)
The maximum displayable value or scale length. In this instrument, the
maximum displayable value is the range (V/div) times the number of divi
-
sions (10) on the vertical axis. Example: For the 1 V/div range, f.s. = 10 V
rdg.
(reading or displayed value)
The value currently being measured and indicated on the measuring instru-
ment.
dgt.
(resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the
input value that causes the digital display to show a "1" as the least-signifi
-
cant digit.
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 out
-
lets.
CAT IV The circuit from the service drop to the service entrance, and to the power meter
and primary overcurrent protection device (distribution panel).
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