Hioki RM3542-50, Instruction Manual

Page: 13 / 234

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
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.
Other Symbols
Indicates the prohibited action.
(p. )
Indicates the location of reference information.
*
Indicates that descriptive information is provided below.
[ ]
Square brackets indicate instrument display labels (such as setting item names).
SET
(Bold characters)
Bold characters within the text indicate operating key labels.
Unless otherwise specified, Windows represents Windows 95, 98, Me, Windows NT4.0, Windows 2000, Windows XP, or
Windows Vista.
Click: Press and quickly release the left button of the mouse.
Double click: Quickly click the left button of the mouse twice.
f.s. (maximum display value)
The maximum displayable value. 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. 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.
• Never use a measuring instrument that lacks category labeling in a CAT II to CAT IV
measurement environment. Doing so could result in a serious accident.
CAT II:
When directly measuring the electrical outlet receptacles of the primary electrical circuits
in equipment connected to an AC electrical outlet by a power cord (portable tools, house-
hold appliances, etc.)
CAT III:
When measuring the primary electrical circuits of heavy equipment (fixed installations) con-
nected directly 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 primary overcurrent protection device (distribution panel)