Instruction manual

iii
Organization of this manual
This manual describes the features, operation and other aspects of the Sound Level
Meter NL-42/NL-52. If the unit is used together with other equipment to con gure
a measurement system, consult the documentation of all other components as well.
Pages v and following contain important information about safety. Be sure to read
and observe these in full.
This manual contains the following sections.
Outline
Gives basic information about the unit.
Controls and Functions
Brie y identi es and explains the operation keys and connectors and all
other parts of the unit.
Preparations
Explains how to check the unit before use and how to install and set up the
unit for measurement.
Calibration
Explains how to calibrate the unit for measurement.
Reading the Display
Explains symbols and other information shown on the display of the unit.
Measurement
Explains the basic procedures for measurement.
Store Operation
Explains how to store measurement data.