Cesva SC420 Class 1 Sound Level Meter

Sound level meter and spectrum analyser

Integrating Sound level meter class 1 with audio recording expandable to spectrum analyzer for third octave bands

INCLUDED Audio recording with pre-recording and voice comments

➤ Increased storage with MicroSD memory card Built-in memory with CSV Files

➤ Automated Parameters: timers, DEN thresholds, external input:
1) Auto start/stop of measurement and logging
2) Auto audio recording & pre-recording Backerase of the ;asst 10 seconds

➤ Erasing backward (BACK ERASE function)

➤ Built-in USB & BLUETOOTH® connectivity 

➤ Sensitivity, date & time change history  

➤ Ready for environmental monitoring:
1) Auto ON and automatic measurement and logging start
2) Downloads while measures

➤ Free or diffuse sound-field correction options





What does it measure?

Occupational noise mode simultaneously measures all the parameters necessary to evaluate the noise exposure of the worker with and without hearing protectors (SNR, HML and Octaves). 


  • Industrial acoustic
  • Noise measurements for air conditioning installations (HVAC)
  • Sound Insulation measurements
  • Frequency analysis of industrial noise, environmental and labour
  • Background noise in rooms


What does it measure?

16 Hz to 16 kHz octave band filters analysis plus overall functions and NC and NR curves


  • Sound insulation measurements
  • Noise measurement for air conditioning installations ( HVAC)
  • Frequency analysis of industrial noise, environmental and labour
  • Background noise in rooms


What does it measure?

10 Hz to 20 kHz 1/3-octave band filters analysis plus overall functions


  • Sound Insulation measurements in  third octave band
  • Assessment of environmental noise (Corrections for the presence of tonal and impulsive components and low frequency content) 
  • Detection and identification of noise sources


What does it measure?

Reverberation time measurement by 1/1 and 1/3-octave bands using the interrupted noise and the integrated impulse response methods. Includes parameters for the evaluation of non-linear decay curves and the influence of the filters


  • Evaluation of the reverberation time of rooms 
  • Measurement of sound absorption in a reverberation room 
  • Measurement of soud insulation in buildings and of construction materials


What does it measure?

FFT Analysis of 10000 lines from 0 to 20000 Hz (2 Hz/line)


  • Detection and evaluation of the tonal components
  • Frequency analysis of continuous and transient signals (industrial and environmental) 
  • Evaluation of tonal components according to ISO 1996-2 and DIN 45681.


What does it measure?

Records WAV (uncompressed) format audio files, 24 bits resolution, 48 kHz sampling frequency and constant gain for later analysis


  • This mode can be advantageous independently of the application in which it is being used as it allows a perfect acquisition of the audio signal, to carry out a post processing and obtain additional information.


Table of standards

IEC 61672-1:2002
Class 1 Sound level meter
IEC 61260:1995
Class 1 Filters
OIML R 58:1998
Class 1 Sound level meter
OIML R 88:1998
Class 1 Integrating sound level
OIML R 130:2001
Class 1 Filters
ANSI S1.4-1983(R2006)
Part 1 Type 1 Sound level meter
ANSI S1.43-1997(R2007)
Class 1 Integrating sound level
ANSI S1.11-2004(R2009)
Class 1 filters
EN 61260:1995
Class 1 filters
EN 61672-1:2003
Class 1 Sound level meter
Complies with 2014/30/UE and EMC 2014/35/UE regulations



The SC420 sound level meter measures a lot of functions for very long periods of time and 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 is to use the CESVA Lab software application.

Download and configure

CESVA Lab is cost free and gives you a simple way  to download all the information from the SC420 by simply removing the microSD card and post-process it. It also allows you configuring the SC420 from the PC.

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.  

App for mobile devices

CESVA SC420 Link

Now available on Google Play for free. SC420 Link is a mobile application designed for Android. Thanks to its intuitive operation, the user can take measurements with the SC420 sound level meter from the touch screen of a smartphone and configure its measurement parameters remotely.

The connection of the SC420 Link application with the SC420 is done through Bluetooth and allows full control of the sound level meter: Change of measurement mode, start and stop of measurement, pause, backerase and start of audio recording.

SC420 Link allows to display in real time the graphic and numerical information of the measurement modules of the SC420: Sound level meter, Spectrum analyser 1/1*, Spectrum analyser 1/3* and Noise at work*.

*Optional modules

Simply mount the SC420 sound level meter on a tripod at the measurement point, position yourself at a suitable distance, connect it to your smartphone via Bluetooth and start measuring remotely safe from potentially dangerous environments and without interfering with measurement in sensitive environments.

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