Instruction manual

i
Organization of This Manual
This manual describes the features, operation and other aspects of the Precision Integrating
Sound Level Meter with 1/3 octave band real-time analyzer NA-27. If the unit is used together
with other equipment to configure a measurement system, consult the documentation of all
other components as well. The following pages 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. Also contains information about items that are
not covered in other sections.
Controls and Functions
Briefly identifies and explains the controls and connectors and all other parts of the unit.
Preparations
Explains how to insert the backup battery and main batteries, how to make connections,
set the date and time, calibrate the unit, and use the menu screens.
Setting Measurement Parameters
Explains how set the basic parameters before starting sound pressure level measurement
and analysis.
Sound Pressure Level Measurement
Explains the operation steps for performing sound pressure level measurement.
1/1-Octave and 1/3-Octave Analysis
Explains the operation steps for performing 1/1 and 1/3 octave analysis.
Data Exclusion (Back-Erase) Function
Explains how to exclude (back-erase) data from a short period before the measurement
was paused.
Trigger Function
Explains how to start the sound pressure level measurement using the trigger mode.
Delayed Measurement
Explains how to perform delayed measurement.
Memory Functions
Explains how to store measurement results in the memory of the unit.