Introduction; Overview - Acoustic Research Ngara User Manual

1 Introduction

This document provides a description of the functions provided by the Ngara logger platform. All displays, user tools,
facilities and capabilities are described herein.

1.1 Overview

The Ngara Sound Acquisition System offers full measurement flexibility, simultaneously producing the following
acoustic measurements –
• Fast or Slow SPL-A
• Fast or Slow SPL-C
• L -A
eq
• L -C
eq
In addition to the above measurements the Ngara platform is able to store raw audio data to a USB storage device,
capable of post processing the majority of your acoustic needs. All of this is achieved in a low power 12-volt
environment.
Simple control and configuration of Ngara can be accomplished through the on-board Liquid Crystal display (LCD)
and push-button interface. More advanced control functions are made available through the remote host software.
This may include:
• Alarm Control
• Triggering Configuration
• Auxiliary Output Configuration
• Email Alerts
• Noise Cloud Interface
The logged data is saved as a formatted list of Sound Pressure Level measurements in a Comma Separated Variable
(CSV) file. Samples are stored at 100ms intervals. The data gathered is capable of being post processed to produce
any required statistical representation of the data obtained.
Both CSV file data and audio data are split into 1-hour long files. A new file is created every hour, on the hour, with
each logging session stored into separate directories.
Version — 25-7cd7566
Ngara
User Manual
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