Example of Noise Measurement Data for an Arterial Highway
Blue: Equivalent continuous A-weighted sound pressure level (Laeq)
Green: Single-shot sound exposure level (Lae)

 

This software analyzes the 1/1 and 1/3 octave bands for 2 - 32 channels (2 - 64 channels when two units are connected ) in real-time from 0.5 to 20 kHz. The filter is compatible with the IEC, JIS, and ANSI standards. The equivalent continuous A-weighted sound pressure level (Laeq) and the single-shot sound exposure level (Lae) are calculated simultaneously by setting measurement time. Variations in level (time series) for each band can be saved for up to 2,000 points.
The software runs under Windows XP/Windows Vista/Windows 7 (32-bit version only). Functionality can be expanded to rotation and tracking analysis with the real-time octave band by adding the optional software DS-0324 and DS-0322.

 


* The equivalent continuous A-weighted sound pressure level is an average level obtained by dividing the total level for duration t by t. The single-shot sound exposure level is a value obtained by converting the duration t level to the level for a duration of one second. Real-time octave analysis

Real-time octave analysis requires frequency analysis when developing measures to deal with noise. Octave analysis has been employed for noise analysis for a considerable time. An octave is a frequency ratio of 1:2, i.e. it is twice the frequency.

The human ear hears equal ratios of frequencies. An octave band series is therefore standardized relative to 1 kHz, and the sound pressure level for each band found with a band pass filter in accordance with the standard. The 1/1 octave band is the octave band relative to 1 kHz. The 1/3 octave band is obtained by dividing the 1/1 octave band into three.

Example of trends in excavator noise level (time history level) data

Example of trends in excavator noise level (time history level) data

 

Example of color mapping of level trends

 

Example of color mapping of level trends

Applications for Real time Octave Analysis

(1) Analysis for noise characteristics in automobile passenger compartment
(2) Analysis for sound pressure characteristics of acoustic products
(3) Compressor noise testing
(4) Noise testing of outdoor air conditioners
(5) Low-frequency sound analysis
(6) Measurement for environmental noise and vibration
(7) Measurement for traffic noise
(8) Handheld tool vibration measurement

Specification

(1) Input section

Number of channels

32 channels at maximum (simultaneous processing):with one unit
64 channels at maximum (simultaneous processing ):with two units by unit connecting function

Input impedance

1 MΩ / approx. 120 pF

Input voltage range Applied every 10 dB, in 6 steps
Input connector BNC voltage input, applicable to CCLD 2 mA, 4 mA
Frequency weighting A, C and Z (FLAT), analog filter
Sensitivity setting Settable for each channel (calibration function)

(2) Filter and detection section

Calculation method

All digital calculation method (Digital filter and Digital RMS)

A/D conversion

24 bit, 64 kHz sampling

Filter type 6th butterworth
Conforming standards (Filter) JIS C 1514-2002 Class 1
IEC 61260 Ed.1.0 (1995) Class 1
ANSI S1.11-2004 Class 1
Frequency range 0.5 Hz to 20 kHz (1/3 OCT)
1.0 Hz to 16 kHz (1/1 OCT)
Time constant 10 ms, 35 ms, FAST (125 ms), 630 ms, SLOW (1 s), 8 s, IMPULSE

(3) Measurement section

Measurable physical characteristics of sound

Sound pressure level for each band
Sound pressure level of band composition (OVERALL)
Sound pressure level of FLAT (ALLPASS)

Basic measurement

INST (Instantaneous value), MAX (Maximum value for each second)
MAX.H (Band maximum value within the measurement time for power operation data)
MIN.H (Band minimum value within the measurement time for power operation data)
P AVG (Average value of instantaneous values within the measurement time for power operation data, which is equivalent to the equivalent sound level)
P SUM (Value obtained by converting the sum of instantaneous values within the specified measurement time for power operation data into the average power level for each second. Equivalent to the single-shot sound exposure level.)

Second processing Differential function(Difference of dB value, difference of antilog value (background noise correction)
Level trend function (Plotting the graph showing level changing in arbitrary band, second processing after memorized)

(4) Display section

Display format

Bar graph display (Allband+Allpass+Overall)
Monitor display (Time trend monitor display)
List display (Allband+Allpass+Overall)
Level trend display (from continuous recording band data)
3D/2D level trend display (color)


(5) Memory section

Memory capacity

4000 blocks Continuous recording of INST data (level trend function)

Recording interval

1 ms to 10 s (variable)

Display data file The folder and file name to be saved can be specified

(6) Data input/output function

Analysis condition file

Open/save of arbitrary measurement condition file

Print function of data

Print function by installing of printer driver

Copy function of data

Pasting data on clipboard at text or bitmap format


(7) Operating environment

OS(Operating System)

Microsoft ® Windows® XP (SP2 or later), Windows Vista® (SP2 or later), Windows® 7
*32bit version only

NET Framework

.NET Framework 3.5 or later

*Windows®, Windows Vista® are registered trademarks of Microsoft Corporation in the United States and other countries.

Other product names and model names are trademarks or registered trademarks of each individual company. The copy rights are reserved by each individual company.

 Revised:2013/12/02



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