Acoustic Research Ngara User Manual page 15

Tag
WAVE FREQ
WAVE DEPTH
WAVE RANGING
TRIG SETTING
TRIG TYPE
TRIG LEVEL
TRIG ON
TRIG OFF
TRIG PERCENTILE
TRIG STAT PERIOD
TRIG PRE REC LENGTH
TRIG POST REC LENGTH
TRIG TMR START
TRIG TMR END
TRIG TMR RPT
3.1.3.3 Data Directories
A new data directory is created once the number of files within the current data directory reaches a high water mark.
This is currently set to 900. This is required in order to avoid the current Operating System limitation of 999 files
per directory.
It may possible to reach this limitation during a triggered recording session

3.1.3.3.1 CSV Data
Logged data is stored to Comma-Separated-Variable (CSV) files. These files are rotated every hour on top of the
hour, with filenames corresponding to the time and date. The following is an example header, which is stored at the
beginning of each each hourly file.
Session Name
Logger Serial Number
Date
Hour
Temperature
Time SPL-A SPL-C LEQ-A LEQ-C
Data is then stored into each CSV file every 100ms. Each new line entry is a snap-shot in time of the logger data,
with the description of each column shown in Table 4.
Name
Time
SPL-A
SPL-C
LEQ-A
LEQ-C
Signal Condition
Battery
Version — 25-7cd7566
Description
Wave file sampling frequency (48kHz or 12kHz)
Wave file number of bits (16bit or 8bit)
Wave file auto ranging (ON or OFF)
Triggering setting (ON or OFF)
Current trigger type
Required trigger level. In the units set in TRIG TYPE entry
Required ON time for level trigger, in seconds
Required OFF time for level trigger, in seconds
Percentile used for statistical trigger
Statistics triggering period length, in minutes
Number of seconds to record before trigger event
Number of seconds to record after trigger event
Start time for timer trigger
End time for timer trigger
Repeat mode for timer trigger (Hourly/Weekly)
20090524_194427
878001
24/05/2009
19
28
Signal Condition
Table 4: CSV Line Description
Description
Time stamp for result
Snapshot of Exponentially Averaged Result
Snapshot of Exponentially Averaged Result
100ms Time Averaged Result
100ms Time Averaged Result
Overload or Range state
Battery Voltage
Battery
Units Format
mm:ss:msec
dB(A) xxx.x
dB(C)
xxx.x
dB(A)
xxx.x
dB(C) xxx.x
1, 2 or 3
Volts
xx.x
Ngara
User Manual
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