Sensidyne Industrial Health and Safety

SV 102 Plus Dual Channel Noise Dosimeter

Svantek SV 102 Plus Dual Channel Noise Dosimeter and Sound Level Meter

SV 102 Plus Dual Channel Noise Dosimeter

Svantek SV 104 Noise Dosimeter - MIRE Measurements

The SV102 + is our latest dual-channel noise dosimeter and replaces our ground breaking SV102. It has been designed for the accurate measurement of noise exposure to ISO 9612 and MIRE (microphone in real ear) measurements to ISO 11904-1.

This new instrument uses a class beating high resolution, full color OLED screen making it even easier to read; even in full daylight. The small memory capability of its predecessor; the SV102, has been upgraded by adding a microSD card for an incredible amount of storage capability. The sampling rate has been increased from 24 kHz to 48 kHz which enables the measurement of sound in the full frequency band. Also new is an LED that indicates the status of the measurement and changes color when the noise dose exceeds the limit set.

A unique feature of all SVANTEK dosimeters, including the SV102 +, is their ability to simultaneously analyze 1/1 octave and record audio events . The use of 1/1 octave analysis is the most accurate method for the correct selection of hearing protection to ISO 4869-2 while simultaneous audio recording allows the user to capture and eliminate false sounds affecting the result of exposure to noise.

Unlike classic single channel noise dosimeters, the two channel SV102 + gives the unique opportunity to assess the exposure on both sides of the head simultaneously. This is particularly important where a worker is exposed to noise coming from a dominant directional source where placing the microphone on only one side could understate the true level of noise exposure. Another use of dual channel technology is the simultaneous measurement of noise both outside and inside any hearing protection being used with the use of a SV25S MIRE microphone.

MIRE methodology requires 1/3 octave analysis, another feature uniquely available in the SV102 + . MIRE measurement involves measuring the sound in the ear and performing a one-third octave band analysis on it. Using the SV102 + in conjunction with a special microphone probe like the SV25S, placed at the entrance of the ear canal, makes this all possible . A typical application of MIRE measurement is noise exposure monitoring in telephone call centres where the sound comes from the headphones; an application not suited to classical dosimetry methods.

Calibration of the both the SV102 + and the MIRE microphone is done using a SV34 calibrator. The calibration factor is stored inside the instrument and in the TEDS memory of the SV102+ microphones. This cross checking solution helps to prevent incorrect calibration factors being used.

The SV102 + is a low power instrument and is powered using only two small AAA batteries. It is fully supported by our Supervisor software which is dedicated to Health and Safety applications.



  • Dual channel Acoustic Dosimeter conforming to IEC 61252 and ANSI S1.25-1991
  • Dual channel class 2, Sound Level Meter conforming to IEC 61672
  • Dual channel 1/1 octave analysis
  • Dual channel 1/3 octave analysis
  • Single measurement range
  • Measurement range 45 dBA RMS ?? 141 dBA Peak
  • MIRE measurement technique with SV 25S
  • Individual evaluation of the HPDs attenuation in real-world
  • Three parallel independent profiles per channel
  • Advanced data logger with audio-events-recording
  • Automatic calibration thanks to the TEDS technology
  • MicroSD card 4GB
  • USB  interface
  • Super contrast OLED display 160x128 pixels
  • Integration time programmable up to 24 h
  • Power supply by two AA rechargeable or standard batteries
  • Easy operation
  • Extremely compact, light weight (260 grams with batteries)  and robust case 
    (size comparable to PDA devices)
Download Datasheet



IEC 61252-1993; ANSI S1.25-1991, Class 2 : IEC 61672:2002

Acoustic dosimeter mode

Leq, Spl, LPeak, SEL, DOSE, D_8h, LAV, SEL8, PSEL, E, E_8h, ?__Peaks Counter?_? and more 
Measurement simultaneous to the 1/1 octave analysis or 1/3 octave analysis and event recording

SLM Mode

Leq, Spl, SEL, LEP,d , Lden, Ltm3, Ltm5, Statistics - Ln (L1-L99), LMax, LMin, LPeak
Simultaneous measurement in three profiles with independent set of filters and detector

Weighting filters

A, C and Z

RMS Detector

Digital True RMS detector with Peak detection, resolution 0.1 dB
Time Constants: Slow, Fast, Impulse


SV 25D, Class 2, ceramic microphone, 1/2" casing with built-in preamplifier & integrated cable
SV 25S, Class 2, ceramic microphone, special version of the SV25D for measurements in real ear - under ear-protectors (option). 
SV25D and SV25S have built in TEDS functionality for the automatic calibration.

Measurement Range

45 dBA RMS ?? 141 dBA Peak

Frequency Range

20 Hz ??20  kHz, sampling rate 48 kHz

Dynamic Range

100 dB

 Data Logger1

Time History logging of RMS / Max / Min / Peak results to internal memory with time step down to 1 second, up to 24 measurement results logged simultaneously

Audio Recorder1

Time domain signal events recorder (option)

Dual channel mode

Dual channel measurement mode with second microphone SV 25D or SV 25S (option)

1/1 octave1

Dual channel 1/1 octave real time analysis and spectra logging, 10 filters with center frequencies from 31.5 Hz to 16 kHz, Type 1, IEC 61260 (option)

1/3 octave1

Dual channel 1/3 octave real time analysis and spectra logging, 31 filters with center frequencies from 20Hz to 20 kHz, Type 1, IEC 61260 (option)



2 x Lemo 2 pin


Color 160 x 128 pixels OLED type


MicroSD card 4GB


USB 1.1 Client, 
Extended I/O - AC output (1 V Peak) / Digital Output (Alarm trigger) / Digital Input (Input trigger)

Power supply

Two AA batteries 

operation time > 16 h 
(3 V / 1.6 Ah)2

Two rechargeable batteries 
(not included)

operation time > 20 h 
(2.4 V / 2.6 Ah)2

USB interface

150 mA HUB

Environmental Conditions


from -10oC to 50oC


up to 90 % RH, non-condensed


95 x 83 x 33 mm (without microphones)


260 grams with batteries (without microphones)

1function parallel to the acoustic dosimeter mode or meter mode
2display off

p>Microphone In Real Ear (MIRE) is a technique for assessing the noise sources placed in a short distance to a human ear, requiring dedicated measuring instrumentation. SV 25S microphone has been designed together with SV 102 dual-channel acoustic dosimeter to meet requirements of ISO 11904 and ANSI S12.42-1995 standards which specify methods for the determination of sound emissions from sources located close to the human ear. SV 25S microphone measures sound pressure level in the ear canal by means of different lengths of probes, easily controlled and placed in repeatable position.

SV 102 instrument with SV 25S microphone is a unique system which measures the noise from the headphones or hearing protectors with audio communication facilities when these are used in a real human ear.

Noise measurements in ear canal are important issue as different persons exposed to the same sound, have different sound pressure levels results at their eardrums. Measurement of individual eardrum sound pressure levels is more accurate for estimating the individual risk of hearing damage in the comparison to usage of the mean eardrum sound pressure level of a population.

SV 25S microphone together with SV 102 analyzer equipped with octave analysis provide individual real-world test of the earmuffs noise reduction ratio. To prevent damage of the eardrum and skin of the ear canal microphone probe tube is covered by one time used silica pipe which provides hygienic comfort as well. Applied TEDS technology ensures automatic calibration. Possibility of easy acoustic calibration with a dedicated adapter SA 130 accomplishes exceptional features of SV 102 dual-channel instrument and SV 25S microphone.

Advanced time-history logging for each profile, together with spectra saving and audio events recording provide complete information about measured signal, which is saved in non-volatile, up to 64 MB internal memory. Data files are easily downloaded to any PC using USB interface and SvanPC+ software.