SV 104A Noise Dosimeter

The SV 104A is a new personal noise dosimeter with a Bluetooth® communication supported by the Smartphone application called Assistant. For measurements of noise at work in accordance to ISO 9612 as well as OSHA, MSHA and ACGIH standards all settings are configurable in the PC software and can be stored in the dosimeter memory as setup files that can be selected directly from the dosimeter keyboard.

The dosimeter has a very robust MEMS microphone that has a lifetime warranty.  All vibrations that affect noise measurement results are detected by an inbuilt tri-axial vibration accelerometer and are marked in the results time history, so they can be easily excluded from dose calculations. Additionally, the accelerometer detects if dosimeter is not used by the worker and marks this information in time history.
We have designed the SV 104A to make noise dosimetry measurements easier. Firstly, the voice comment feature replaces necessity of identifying the dosimeter with a different type of stickers. Secondly, a single large measurement range of 53 dB to 141 dB enables measurement in all kinds of working environment. But mostly, the auto-calibration is what makes the SV 104A easy in use. Once the SV 104A detects a calibration signal, it calibrates automatically saving the calibration data together with the measurement file, before and after measurement.
The list of distinguishing features of SV 104A includes a color OLED display that can be easily read even in a full daylight or in the dark. The user interface is very friendly to use which makes setting up and using the instrument easier than ever. The user may choose from multiple setup files that can be configured through the included “Supervisor” software. All measurement data are stored in the integral 8 GB memory which provides a vast amount of storage.




  • Shock resistant MEMS microphone with a life-time warranty
  • Bluetooth® communication and application for Android platforms
  • Personal Noise Dosimeter conforming to IEC 61252, ANSI S1.25 and Class 2 IEC 61672
  • Single measurement range 53 dBA RMS ÷ 141 dBA Peak
  • L(C-A) calculation
  • Automatic calibration start (auto-calibration)
  • Built-in tri-axial accelerometer for vibration shock (knocking) detection
  • High contrast color OLED display
  • Option for octave real-time analysis
  • Option for audio events recording (wave format)
  • Voice tagging
  • Three virtual measurement profiles
  • Measurement of Laeq and Lcpeak in one profile
  • Operational time > 48 hours
  • Rechargeable battery
  • Extremely compact, light weight and robust case


Standards IEC 61252; ANSI S1.25-1991; Class 2: IEC 61672-1:2013
Weighting filters A, C and Z
Time constants Slow, Fast, Impulse
Exchange rates 2, 3, 4, 5, 6
Measurement results Lavg/Leq, SPL, Max, Min, SEL, SEL8, PSEL, LEPd, Dose (%), TWA, E, E_8h, Peak, Run Time, Upper Limit, Time (ULT), L(C-A), Projected Dose (D_8h)
Measurement profiles 3
Microphone Class 2 microphone, 1/2″ MEMS type
Measurement range 53 dBA RMS ÷ 141 dBA Peak
Frequency range 20 Hz ÷ 10 kHz
Dynamic range 98 dB
Data logging Summary results for the measurement time
Time-history logging of Leq/Max/Min/Peak with 1s logger step
Voice comments Audio records on demand, created before or after measurement, added to measurement file
Audio recording Audio events recording, trigger and continuous mode, 12 or 24 kHz sampling rate, wav format (option)
1/1 octave Real-time analysis in octave band filters, Class 1, IEC 61260
9 filters with centre frequencies from 31.5 Hz to 8 kHz (option)
1/3 octave Real-time analysis in 1/3 octave band filters,Class 1 IEC 61260; 28 filters with center frequencies from 20 Hz to 10 kHz (option)

Basic data

Display 128 x 64 pixels OLED
Memory 8 GB
Interfaces USB 2.0 client, electrical contacts (new-type docking station compatible)
Long-range Bluetooth®, 4.0 Smart
Keyboard 3 push buttons
Power supply Li-Ion rechargeable cells: operation time > 48 hours1
USB interfac:e 500 mA HUB
Environmental conditions Temperature from -10 oC to 50 oC
Humidity up to 95 % RH, non-condensed
Dimensions  88 x 49.5 x 19.2 mm
Weight 121 grams with batteries

 1depends on instrument settings

*Continuous product development and innovation are the policy of our company. Therefore, we reserve the right to change the specifications without prior notice.

Ordering Info

Standard Kit

The standard SV 104A kit includes ST104A shock resistant MEMS microphone, windscreen with a steel mounting thread and a USB cable for communication with PC. The instrument has an inbuilt 8 GB memory and a long-range Bluetooth interface for communication with Assistant application. Each SV 104A has its factory calibration certificate, 36-MONTH WARRANTY CARD and LIFE-TIME WARRANTY card on MEMS microphone. The standard kit also includes license for PC software and Assistant application for smart-phones.

Optional Functions

The option for 1/1 and 1/3 OCTAVE real-time analysis allows accurate and correct selection of hearing protectors. When presented as a spectrogram, the frequency analysis can be used for a quick verification of noise sources in the time history. It can be activated at any time, by entering an activation code.

The AUDIO EVENTS RECORDING option works during measurement and is logged in parallel to time history so it can be played back in the PC software. The settings, like triggers or recording time, are adjustable. It can be activated at any time, by entering an activation code.

Optional Accessories

SA 54 USB Charger

SA 156 USB Hub for 5 Noise Dosimeters

SA   122A Spare Windscreen

SA 147 Waterproof Carrying Case for Noise Dosimeter and Single Docking Station

SV 34 Class 2 Acoustic Calibrator 114 dB at 1 kHz

SV 35A Class 1 Acoustic Calibrator 94 / 114 dB at 1 kHz