Cirrus Research CR 151, Руководство пользователя

Страница: 20 / 47

optimus sound level meter user manual
Page 20
can diagnose your problem accurately. After writing down the code, pressing the right
key will clear the screen and the instrument can be used as normal.
Battery indicator
The status of the batteries is shown in the Battery Level Indicator. When the batteries
need replacing, the indicator will turn red.
Low Battery Indication while switching on
If the start-up screen flashes quickly when you press the on button, the batteries have
insufficient power to start and need changing.
Audio Recording
Audio recording can be started automatically using the Audio Triggers or manually
using the Audio soft key.
This starts the
optimus
recording raw WAV data at a quality which can be set in the
Menu (Standard or Studio).
Details of the Audio Triggers can be found in Technical Note 28 - Audio Recording
with the optimus green sound level meters
. Please refer to the Cirrus Research plc
website at www.cirrusresearch.co.uk/library/optimus .
Pressing the audio key again stops the recording. There is no maximum duration of an
audio recording set by default, but it can be changed in NoiseTools, and the
parameters for the Audio Triggers can be configured in NoiseTools.
The audio recording includes a 10 second back buffer (on the Standard quality setting).
When triggering a recording manually, it’s very difficult to record the beginning of a
sound that catches your attention.
The back buffer will cover the time it takes you to respond and press ‘record’. 10
seconds is the default duration, which can be changed in NoiseTools.
The Time History display and Analog bar turn blue when audio recording is running
and revert to green when it is stopped.
Starting and stopping audio recording during a measurement does not affect the noise
measurement data being recorded.
Please note, VoiceTags are recorded BEFORE the measurement starts and are for
spoken notes only, not for analysis of recorded sounds.