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SM30 Sound Pressure Level Meter

The SM30 Sound Meter from Bedrock is an advanced sound measurement instrument that is easy to use, reliable and accurate. Equipped with a Class 2 BAMT microphone, 3.2” full-colour resistive LCD touch screen, high speed USB2.0 output interface and tripod mount facility, SM30 is a sound measuring instrument that is easy to use for anybody involved in (acoustic) testing and certification.

SM30 is enabled with several features (but not limited to) like:

  • Sound Level Meter Class 2 (SLM) 


  • Real Time Analyzer (RTA)


  • Fast Fourier Transform (FFT) Analyzer


  • RTA Logging


  • RT60 Measuring (Reverberation Time)


  • L Level (L%)


  • Noise Curve analysis


  • Sound Pressure Level (SPL)

  • Total Harmonic Distortion plus Noise (THD+N)


  • LAeq logging


  • Statistical Acoustics and Building Acoustics SRI/STC



The SM30 sound measurement device comes with 4 GB internal space to store the test results/ recorded audio, which can be copied to a PC using the supplied USB cable. Each SM30 sound meter comes with an individual declaration of conformity and calibration certificate to differentiate the instrument from market variants. Additional functionality as will be added will be available through free future firmware upgrades.

SM30 is a precision logging sound level meter that is used to measure room acoustics, spectral properties of sound, long term logging and analysing of sound as well as AC Volt meter for audio line level measurements.

SM30 can be used in routine testing of:

  • Noise level measurement in environmental science
  • Noise pollution
  • Automotive design noise measurement
  • R&D
  • Building acoustics
  • Sound insulation
  • Acoustic equipment testing and audio professionals

Conforms to major international standards like:

  • IEC-60268-16 rev. 4 & rev. 5
  • IEC-61672 Class 2 / ANSI S1.4 Type 2
  • IEC-61260 Class 0
  • ISO-717-1 / ISO-16283 / ISO-140
  • ASTM E336 / ASTM E413 ISO-3382-2
  • ANSI S12.2 / ISO-1996 AES17

The SM30 sound meter is a handheld instrument which can be used for accurate sound level measurement at multiple points – giving a clear understanding of the properties of the sound and to measure noise level . It can also be used on a tripod mounted method- facilitating long term sound logging and analysis.


Kit Contains:

  • SM50 Instrument with class 2mic
  • International charger adaptor
  • USB cable
  • Windscreen
  • Carrying cord
  • User manual
  • Calibration certificate
  • Ruggedized Case

Optional BAC2 Calibrator is available to verify and calibrate the SM30. Provided with individual calibration certificate.


Product Specification
Function Guideline / Application SM30
Modules / Functions
Sound Pressure Level Meter (SPL / SLM) IEC-61672-1 : 2014, ANSI S1.4   Class 2 / Type 2
Frequency Weighting Choose frequency method A ,C, Z (A : weighted, C : weighted , Z : Unweighted)
Time Weighting Choose based on time frames FAST , Slow, Impulse
Equivalent continuous (EQ)   Computes the time-integrated level over the
measurement interval
Sound Exposure level (SEL)   Time-integrated value normalized to 1 sec
Peak Value   Highest instantaneous value within an interval
Max Hold Lock on highest values measured Maximum level during the measurement
interval; Used with Fast, Slow or Impulse time weighting
Measurement Time  Set duration of measurement Set Measurement Time or Continuous (for infinite)
LEQ Long-term  logging/monitoring (LAEQ) Monitoring of continuous environmental noise / logging of sound levels, e.g. LAeq15min Track equivalent continuous sound pressure level  (LEQ) develop over time with simultaneous logging of A/C/Z
Real Time Analyzer (RTA)  Frequency Analysis for separate frequency bands Frequency analysis in range 20 Hz to 20 KHz for frequency bands 1/1, 1/3, 1/6 or 1/2 octaves. Two spectral views present- frequency weighting or time weighting
Fast Fourier  Transform Analyzer (FFT) Perform spectral analysis with higher frequency resolution  Up to 32768 data points, with Zoom In/Out feature, Spectral analysis for identifying exact frequency and level of signal components and study of harmonic structure of sound
L%, Statistical acoustics  Acoustic statistics based on threshold expressed as percentile, e.g. L10 to L95 can be measured Simultaneous measurement and display of six different settings
RTA Logging Long term monitoring of special characteristics of sounds  Spectrograms, with averaging window between 1 to 999 seconds of spectrum in 1/1, 1/2, 1/6 or 1/12 octave as well as A, C , Z weighted equivalent continuous levels
Electro-Acoustics & Electric Analysis        
Digital Storage Oscilloscope  Inspect acoustic signals, in particular periodic signals, in time domain Yes, up to 20kHz
Polarity  Check polarity of loudspeakers Yes,  Use test signals provided or use with BTB65 Talkbox
AC Volt Meter for Line Level Signals Assess Output level Yes, Measure Vrms, dBU, dBV
Total Harmonic Distortion & Noise (THD+N ) Quantify distortion levels in electro-acoustic equipment.   Value THD+N is expressed as a percentage (%) or a signal-to-noise ratio (dB)
Fundamental Frequency Estimation   Yes, Measurement in Hz with pitch & offset
Building / Structural Acoustics        
Sound Insulation: Evaluate airborne sound transmission loss 4 different frequency dependent measures :  D, Dn, DnT, R
Sound Reduction Index; Sound Transm. Class (SRI / STC ) For specifying and measuring sound insulation   4 metrics R'w ;  Dn,w ; DnT,w ; STC
Room Acoustics        
Reverberation Time (RT60) Measure sound energy decay Full Octave and 1/3rd octave measurements are supported. As per ISO-3382, Suggested to be used with BTB65 Talkbox
Noise Curves  Choose method based on standard. NR, NC, PNC, NCB, RC, RCII
Acoustic Specifications
Linear Range, Electric Input (dBuV)   21 ~132dB
Measurement Range (dB) , Linear Range with Supplied Microphone, dBA SPL   30 ~122dB
Frequency Range (Hz) Covers entire range  heard by human ear 20 ~20.000
Accuracy (dB)   0.5
Resolution (dB)   0.1
Octave Filter   Class 1 1/1, 1/3, 1/6 and 1/12 octave filters
  31.5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz
Analysis Rate   93.5 times/sec
Sampling Frequency (kHz)   48
Add Text Annotations to Measurements Yes 
Capability to Record Audio of all Measurements Yes, in .wav format
Automatic Level Calibration Procedure   Yes
Calibrated Recording of Audio on Internal Memory   Yes
Real-time Calibrated USB Audio Device Mode   Yes
Declaration of Conformity   Declaration of conformity provided with individual Calibration certificate 
External Calibrator   Optionally available
Display   Full-color 3.2” resistive LCD touchscreen display
Microphone Connector   XLR 48V
Microphone Provided with Instrument   Class 2 electret microphone & preamp (1/4”), 30 mV/Pa sensitivity
Data Storage for measurement data and audio (GB)   4
Remote Control from PC via USB (either through Serial Commands or Cloning of the Display)   Yes
Data Output   To PC, files can be saved as .csv for data viewing in spreadsheets ; audio recordings also saved in .csv files
Battery   Rechargeable Internal Battery, 2500 mAh
Capability to Connect to External Power Supply For long duration continuous measurement Yes, instrument can connect via USB port to power banks or charger
Internal Real-time Clock and Calendar   Yes
Size/Weight   210 x 85 x 55 mm( excl. microphone); 530 g ( including microphone)
Temperature/ Relative Humidity    -10 to +55 ⁰C; 0-95%
Colors   Blue and black
Supply will include   Microphone (Class1 for SM90 / Class2 for SM50 AND SM30), USB charger, Intl. Charger adapters, measuring instrument, cables, windscreen, manual, carrying cord, USB flash drive with test signals & software tools in a ruggedized waterproof carrying case


  • Statistical acoustics (L10, L90, etc)
  • Class 2 / Type 2 sound level meter (fast, slow, impulse; A/C.Z-weighting, Leq, SEL) conforming to IEC-61672 class 2, ANSI S1.4 Type 2.
  • Real Time Analyzer (1/12, 1/6, 1/3 and 1/1 octave)
  • FFT analyser (detailed frequency analysis up to 32768 lines)
  • RT60 measuring (reverberation times: T20/T30/EDT).
  • Noise Curves (NR, NC, PNC, NCB, RC, RC mark II)
  • THD+N With firmware 2.6
  • Fundamental frequency estimation with firmware 2.6
  • Building acoustics: D, R', DnT, Dn with firmware 2.6
  • Building acoustics: SRI/STC. With firmware 2.6
  • Audio oscilloscope
  • Long term logging and monitoring (LEQ, RTA)
  • AC Volt meter for audio line level measurements (dBU, dBV, V rms)
  • Calibrated audio recording
  • USB audio device mode - calibrated audio for your PC-based software applications
  • More functionality will be added through free future firmware upgrade
  • 4 GB Internal Memory
  • Low startup period of 20sec after power up
  • Full-color 3.2” resistive LCD touch display
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