BSWA309 Class 2 Sound Level Meter

SKU: 06BSWA309

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This high quality yet low cost class 2 sound level meter comes as standard with 1/1 Octaves with an optional upgrade to 1/3 Octaves should you require.

It is fully compliant with IEC 61672-1:2013, ANSI S1.4-1983 and ANSI S1.43-1997. The linearity range is 25dBA~136dBA and it has a single range to cover 123dB/122dB dynamic range.

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BSWA309 Class 2 Sound Level Meter

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Product Specification unless deselected above

Boxed Weight (kg) 0.7
Brand BSWA
Noise Features 1/1 Octaves, 1/3 Octaves, Data Logging
Class Class 2
Measurement Parameters Lspl, Leq, Lmin, Lmax, Peak
Available Outside the UK? Yes

BSWA309 Class 2 Sound Level Meter

This is the BSWA309 Class 2 sound level meter which complies with IEC 61672-1:2013, ANSI S1.4-1983 and ANSI S1.43-1997. The linearity range is 25dBA~136dBA and it has a single range to cover 123dB/122dB dynamic range. They have a frequency weighting A/B/C/Z and a time weighting of fast/slow/impulse.

There is a 3 profile calculation in parallel with different frequency/time weighting and 14 custom define measurement. This meter comes standard with 1/1 Octaves, however, you have the option of 1/3 Octaves. It will calculate SPL, LEQ, Max, Min, Peak, SD, SEL and E and there is LN statistics and time-domain curve display. The BSWA309 has user define integral period measurement and integral period up to 24h.

There is high speed ARM with FPU (Float Point Unit) to achieve wide frequency response, large dynamic range and low noise floor as well as 4G MicroSD card (TF card) mass storage. There is a RS-232 remote control port and a mini thermal printer for measurement data print.

Please Note: The Peak C Range of this instrument is 45dB(A)~139dB(A)


  • Single Chip High Speed ARM with FPU
  • White Backlight LCD
  • Integral Period from 1s~24h
  • 0.1s, 0.2s, 0.5s logger step added
  • 5 templates to save user setting
  • B-Weighting added to meet ANSI standard
  • Automatic Power on with external supply, ease of integration
  • USB Port Function Implemented
  • Update Firmware via USB (also power supply)
  • Timer Feature Support Auto Measurement
  • Internal GPS (option) with GPS Timing
  • Single Range to Cover 123dB dynamic range
  • Upper Limit of Measurement: 136dBrms/139dBpeak (40Mv/Pa)


  • Basic Noise Measurement
  • Environmental Noise Assessment
  • Product Quality Check
  • Evaluation of Noise Reduction Engineering

Technical Specification

Accuracy Class 2 / Type 2
Standard GB/T3785.1-2010, GB/T3785.2-2010, IEC60651:1979, IEC60804:2000, IEC61672-1:2013, ANSI S1.4-1983, ANSI S1.43-1997
Octave Real-time 1/1 Octave: 20Hz~8kHz Optional Real-time 1/3 Octave: 20Hz~12.5kHz GB/T 3241-2010, IEC 61260-1:2014 ANSI S1.11-2004. Base 10 system
Supplied Microphone MPA309T: 1/2” prepolarized measurement microphone, Class 2. Sensitivity: 40mV/Pa. Frequency Range: 20Hz~12.5kHz.
Mic Interface TNC Connecter with ICCP Power Supply (4Ma/24V)
Detector/Filter All Float-Point Digital Signal Processing (Digital Detector and Filter)
Integral Period 1s-24h User Define Integral Period. Repeat Time: infinite, 1~9999
Measurement Functions LXY(SPL), LXeq, LXYSD, LXSEL, LXE, LXYmax, LXYmin, LXPeak, LXN. Where X is the frequency weighting: A, B, C, Z; Y is time weighting: F, S, I; N is the statistical percentage: 1~99.
24h Measurement Automatic Measurement and Log the History Data
Frequency Weighting Parallel A, B, C, Z (It can also be applied to 1/1 and 1/3 Octave)
Time Weighting Parallel F, S, I and Peak Detection
Self-Noise Sound: 20dB(A), 26dB(C), 31dB(Z) Electrical: 14dB(A), 19dB(C), 24dB(Z)
Upper Limit 136dB(A) Increase to 154dB(A) with 5mV/Pa Microphone
Frequency Response 20Hz~12.5kHz
Linearity Range 25dB(A)~136dB(A)
Dynamic Range 122dB (14dB(A)~136dB(A))
Peak C Range 47dB(A)~139dB(A)
Range Setting Single Range
Resolution 24Bits
Sampling Rate 48kHz (Sampling Interval for LN: 20ms)
Noise Curve Time Domain Noise Curve Display. Duration Time: 1min, 2min, 10min
LCD Display 160x160 LCD with White Backlight, 14 step contrast level
Mass Storage 4G MicroSD Card (TF Card)
Post-Processing Post-processing software VA-SLM can read, analyze and generate reports of store data
Export Data Directly connect to the computer to read the memory card (USB disk)
Output AC (max 5VRMS output), DC (10mV/dB), RS-232 serial interface and USB virtual serial port
Alarm User Define Alarm Threshold. LED Indicate the Alarm Status
Power Supply 4x1.5V alkaline batteries (LR6/AA/AM3), sustainable use of more than 10 hours. It also can be supply by external DC power (7V-14V 500mA) and USB power (5V 1A)
RTC Built-in backup battery has been calibrated at factory to the error <30s in 30days (<10ppm, 25?C). It can keep RTC running when replacing the main batteries. GPS timing function available (option with GPS module)
Firmware Update Update firmware via USB port
Conditions Temperature: -10℃~ 50℃. Humidity: 20% ~ 90%RH
RT Temperature Real-Time Temperature Display on the Main Screen
Size (mm) W70 x H300 x D36
Weight Approx 620g, including 4 Alkaline Batteries

What's in the Box

Whats in the Box?

  • Class 2 1/1 Octave Sound Level Meter
  • Type 1 Microphone
  • 4G microSD card
  • Carrying Case
  • a 9-cm windscreen
  • 4 AA batteries
  • Calibration Chart
  • Frequency Weighting of Parallel A, B, C, and Z

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