Sound / Noise measurement

Sound Viewer

Mobile Sound Viewer MSV

Mobile Sound Viewer is the first fully portable acoustic camera which can locate in real time the location in space from where the most important sound come.

The location accuracy is about one centimeter when the measurement is close and a few tens of centimeters when measured farthest. It is possible to save pictures or videos just to communicate with other contacts.


  • Visualization of the acoustic spot on the real-time video.
  • Ready to use right out of the bag
  • Detects the usual noises, short noises like shock, special tone
  • Very compact


  • Sample frequency 12 kHz, 16 bits
  • 60 minutes data storage
  • Capacitive Touch Screen with 1280x800 pixels resolution
  • Internal battery (4 hours in continuous use, 1 day in normal use)
  • 8 microphones 20Hz to 20 000Hz (200-4000 Hz by software limitation)
  • Auto-focus optical system
  • 4 acoustic image /second
  • Usual noise detection
  • Detect also short noise (shock)
  • Selection of particular sounds by listening
  • Auto focus (0.2 to 5 m)
  • Measurement distance (0.2 to 50 m)
  • Sonometer
  • Recordings (photos, videos)
  • Saturation alert
  • Composite fiber shell
  • Weight 0.5 kg
  • Dimensions:30 cm x 20 cm x 3 cm

3 versions

  • 1. only show the more important noises
  • 2. add the possibility to filter out noise to detect particular tone sounds like wheezing
  • 3. the high-end MSV add the possibilty to locate short noises like clicks or shocks

here can you see how it works:

Sound level meter

Analysis Sound Viewer (ASV), Post processing software for MSV

Analysis Sound Viewer is the acoustic imaging software to analyse data saved from Mobile Sound Viewer. Datafile from MSV includes video in order to synchronize pictures and acoustic maps at everytime. Analysis Sound Viewer provides spectrum of hotspot coming from sound source. User can see acoustic video too in according to low and high filter bands.


  • Spectrum of the acoustic source
  • Listen on the microphone and the acoustic map via mouse cursor
  • Synchronization of video and acoustic map at everytime.
  • Calculation of acoustic level in dB of the source
  • Graphic vizualization of time signal
  • Spectrogram
  • Principal source localization
  • Acoustic image in dB
  • Acoustic Video
  • Spectrum of source (Lin, octav, 1/3 octav)

Sound level meter

Sound level meter Testo 815

The instrument can be used to monitor accurately and quickly, noise in heating technique or air conditioning, nightclubs, machinery or combustion plants.

By using the "FAST SLOW" button, the measurement time can be set from 1 second to 125 ms, to better determine the source of the noise. The frequency can be analyzed through two characteristic curves A and C. Curve A corresponds to the noise sensation of the human ear. Curve C is used when it is necessary to also measure in the field of low frequencies.

With the help of a calibrator (optional), the measuring instrument can be calibrated directly on site with the supplied screwdriver. The cap protection included at delivery can be used against wind, allows correct measurement results when measurements are made on the outside and it can also protect the microphone from dirt and dust.

  • Measurement range: 32-130 dB
  • Measuring ranges: 30 to 80 dB; 50 to 100 dB; 80 to 130 dB
  • Frequency: 31.5 Hz to 8 kHz
  • Variable time constant of 125 ms (fast) and 1 s (slow)
  • Influence of pressure: -0.0016 dB / hPa
  • Accuracy: ± 1 digit, ± 1.0 dB
  • Resolution 0.1 dB
  • Temperature 0 to +40 ° C
  • Storage temperature -10 to +60 ° C
  • Battery type 9V
  • Autonomy 70 h
  • Weight 195 g
  • Dimensions 255 x 55 x 43 mm


Sound level meter Testo 816

Like the testo 815 with:

Automatic range switching

Bar-graph display

output AC / DC

Sound level calibrator Testo 0554 0452

Calibrator, for regular calibration of the soud devices like Testo 815, Testo 816, Testo 816-1

Sound pressure level: 94dB/114dB ±0.5dB

Frequency: 1000Hz ±2%

Reference conditions

  • Temperature: +23°C (74°F)
  • Relative humidity: 50%
  • Air pressure: 1013hPa

Operating conditions

  • Temperature: 0 to +40°C (32 to 140°F)
  • Relative humidity: 10 to 90%RH
  • Air pressure: 650 to 1080 hPa

Dependency coefficients

  • Pressure dependency: 0.005dB/hPa
  • Temperature dependency: 0.005dB/°C
  • Humidity dependency: 0.005dB/%RH

Distortion factor: <3%

Battery: 9V block (6F22)

Battery life: Approx. 40 hours

Dimensions in mm (lxbxh): 113 x 63 x 44

Weight: Approx. 170g (incl. battery)

EC guideline: 89/336/EEC



Oberdorfstrasse 51
CH 3930 Eyholz
tel + 41 27 946 80 18
fax + 41 27 946 86 42