11
Safety Information
Symbols on the instrument
Indicates cautions and hazards.
When the symbol is printed on the
instrument, refer to a corresponding
topic in the Instruction Manual.
Indicates a grounding terminal.
Indicates AC (Alternating Current).
Indicates the ON side of the power
switch.
Indicates the OFF side of the power
switch.
Symbols for Various Standards
Indicates the Waste Electrical and
Electronic Equipment Directive
(WEEE Directive) in EU member
states.
Indicates that the product conforms
to regulations set out by the EU
Directive.
Accuracy
We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values,
with the following meanings:
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., the input value that
causes the digital display to show a “1” as the least-significant digit.
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for vari
-
ous electrical environments, categorized as CAT II to CAT IV, and called measurement categories.
DANGER
•
Using a measuring 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.
•
Never use a measuring product 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 cir
-
cuits in equipment connected 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) 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)
T
Outlet
CAT II
Internal wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed Installation
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Summary of Contents for IM3536
Page 20: ...16 Operating Precautions ...
Page 34: ...30 Screen Layout and Operation ...
Page 140: ...136 Testing the System Self diagnosis ...
Page 224: ...220 About Measurement Times and Measurement Speed ...
Page 240: ...236 Discarding the Instrument ...