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Organization of This Manual
This manual describes the features, operation and other aspects of the General-
Purpose Sound Level Meter NL-21 and High-Precision Sound Level Meter
NL-31.
The manual contains the following sections.
Outline
Gives basic information about the configuration and features of the
unit, and also contains a block diagram.
Controls and Functions
Briefly identifies and explains the controls and connectors and all other
parts of the unit.
Preparations
Gives information about power supply, pre-use checks, installation,
connections, key settings etc.
Reading the Display
Explains the symbols and other information appearing on the display
of the unit.
Power On/Off
Explains how to turn the unit on and off.
Measurement
Explains how to perform measurement.
Store Operations
Explains how to store measurement results in the memory of the unit.
Memory Card
Explains how to use memory cards with the unit.
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