Ngara
User Manual
Table 11: Email Body Descriptors
Item
Description
Sample
YYY-MM-DD HH:MM
Time and Date for interval that caused the alert
2018-08-20 23:45
Lx
Configured alert percentile (or L
eq
)
L90
len
Length of interval
15min
band
Displayed for band limited results only
10Hz to 1kHz
xxx.x
Actual value
56.4
fweight
Frequency weighting
A
level
Configured alert level
50
Due to internal buffering, a single email may contain alerts for multiple time periods, and/or multiple
statistics configurations.
This ensures that alerts are not discarded due to bad network status.
3.4 Industrial Noise Monitor
When Ngara is configured for Industrial Noise Monitor operation, it provides an additional processing channel. This
channel consists of a configurable band pass filter, with the band edges being those defined for
1/3
octave bands and
range from
10
Hz
to
20
kHz
. See Section 4.5.8 for details on updating the band edges using the on-board interface.
3.4.1 Additional Data
Band filtered logger 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 filenames are distinguished from the all
pass result files with a
bpv
file extension. When found in session data directories, these files are automatically added
to statistics conversions providing a full secondary output file solely for the purpose of band filtered statistics.
Following is the header information stored at the beginning of each each file.
Session Name
20090524_194427
Logger Serial Number
878001
Date
24/05/2009
Hour
19
Temperature
28
Time
SPL-A
SPL-C
LEQ-A
LEQ-C
Signal Condition
Battery
Data is then stored into each CSV file every
100
ms
. Each new line entry is a
snap-shot
in time of the band filtered
logger data, with the description of each column shown in Table 12.
Table 12: Band Filtered CSV Line Description
Name
Description
Units
Format
Time
Time stamp for result
mm:ss:msec
SPL-A
Snapshot of Exponentially Averaged Result
dB(A)
xxx.x
SPL-C
Snapshot of Exponentially Averaged Result
dB(C)
xxx.x
LEQ-A
100
ms
Time Averaged Result
dB(A)
xxx.x
LEQ-C
100
ms
Time Averaged Result
dB(C)
xxx.x
Signal Condition
Overload or Range state
1, 2 or 3
Battery
Battery Voltage
Volts
xx.x
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Summary of Contents for Ngara
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