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Software for downloading, displaying, editing and reporting data from SC420, SC250 and SC202.

  • Download of records from the SC420, SC250 and SC202.
  • Simultaneous numerical and graphical display (tables and graphs) using synchronized panels
  • Playback of audio files (for SC420) in sync with the display of sound level functions
  • Automatic report generation in PDF format
  • Direct copy to Excel of measurement sections
  • Editing and re-calculation of sound level functions of layers with multiple measurement sections

Main Features

The  SC420, SC250 and SC202 sound level meters measure a lot of functions for very long periods of time and the SC420 also records audio files automatically. The best way to approach the analysis of all these functions together with the qualitative information provided by the audio files (SC420) is to use the CESVA Lab software application. 

Data download

CESVA Lab is cost free and gives you a simple way  to download all the information from the SC420, SC250 and SC202  and post-process it.  

View and Listen

Moreover, it provides an intuitive and user-friendly interface which allows numerically and graphically display of all the measurement information on the screen in several synchronized panels (spectrum and time history graphs and 3D spectrograms) and listen to the audio files for each sound event.  

Export and report

To navigate through the information, CESVA Lab has an audio and mark browser and a very powerful zoom  and pan tool for finding the desired section and then automatically generate a PDF report.


Edit and re-calculate

If what you want is to recalculate a section, simply select it, add it to a layer and simply calculate. Different layers, containing  several sections,  can be calculated simultaneously. Each layer is calculated and saved in a separate file.  

Results in Excel

The results of each layer are automatically copied to the Clipboard;, thus they can be pasted directly into a text editor (Excel, Word, Access ...). 


The LDEN application allows calculating whole-day composite noise rating levels and rating levels during different periods of one whole day. These rating levels are defined in the ISO 1996-1 standard. Once the daytime, evening and night periods and their corresponding penalties are defined, the LDEN application calculates the following rating levels: 

  • LD: daytime noise level
  • LE: evening-time noise level
  • LN: night-time noise level
  • LDN: day-night noise level
  • LDEN o CNEL (Community Noise Equivalent Level): day-evening-night noise level 


The application TWA allows, from a .CDF file type S (SLM) with information on the time base 1s, evaluating the noise exposure of a worker (Average Level Lavg, Time Weighted Average TWA and noise dose D) according to standards from different agencies OSHA, MSHA, NIOSH, ACGIH, and DoD. 
The TWA application also allows introducing a projection time (true exposure time), so shorter measurements than the exposure time can be done and then getting the results using the projected parameters.    

Optional Modules


LDEN application


TWA application