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With FlexPro's Acoustics option, you can save valuable time when performing sound power computations. FlexPro's analysis wizard integrates the calculations of the individual sound levels and the sound power into one process and presents the results in tables and diagrams while you are parameterizing the analysis.
Calibrations made easy
To obtain correct sound levels, a calibration must be performed. You may either specify a fixed calibration value or let FlexPro calculate the calibration value from a calibration signal recorded with the calibrator attached to the microphone. You may do an automatic calibration by attaching a calibrator to the microphone prior to the measurement for a few seconds, and then continue with your measurement.
Time domain octave analysis
Especially for low frequencies, an octave analysis based on FFT analysis will lead to incorrect results. FlexPro's Acoustic option is indispensable because it lets you calculate octave analysis with time domain filters.
Loudness and loudness level
The perceived loudness is a psychoacoustic factor and depends not only on the sound pressure level, but also on the frequency spectrum and time response. FlexPro supports the two Zwicker and Stevens standards.
Adds state of the art acoustical methods:
- Sound power calculation including all correction terms for barometric pressure and temperature (K0), background noise (K1), environmental correction (K2), and enveloping surface (Ls).
- Sound level evaluation: Frequency weighting LINEAR, A, B, C, time weighting FAST, SLOW, IMPULSE, Leq, peak. Results may be level versus time or last level. Easy calibration support.
- Caluclating loudness: Stevens method (ISO 532 A) and Zwicker method (ISO 532 B) for diffuse sound field and direct sound field. Calculates loudness (sone), loudness over time and the loudness level (phon).
- Octave analysis using time domain filters: resolution octave, third octave and 1/6, 1/12 and 1/24 octave. Frequency weighting of result may be LINEAR, A, B, C.
Standards
The Acoustics option has been developed in accordance to the following standards: Standard | Description | Used with
| IEC 651
| Sound level meters
| Sound Level
Computation,
Frequency
Weightings
A, B and C
| IEC 804
| Integrated-averaging sound level meters | Sound Level
Computation
| DIN EN ISO 3744, DIN EN ISO 3745, DIN EN ISO 3746
| Determination of sound
power levels of noise
sources using sound
pressure. Engineering
method in an essentially
free field over a reflecting plane.
Precision method
grades 1 (3745),
2 (3744), 3 (3746)
| Sound Power
Computation
| DIN 45 635
| Measurement of
airborne noise emitted
by machines | Sound Power
Computation
| ISO 532
| Acoustics - Method for calculating loudness level
| Loudness computation | DIN 45 631 | Procedure for calculating the loudness level and the loudness from the sound spectrum; E. Zwicker method | Loudness computation | DIN 45 651
| Octave filters for
electro-acoustical
measurements
| Octave analysis
| DIN 45 652
| Third octave filters
for electro-acoustical
measurements | Octave analysis
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