The NEW BSWA 309 is a new generation octave sound level meter upgrade from base BSWA 309. The new types update the dual-core (DSP+ARM) architecture to single chip ARM with FPU, and update all fix-point calculation to float-point which significantly improves the accuracy and stability. Re-design analog front end circuit also lower the noise floor and linear range of product.


  • Class 2 (New BSWA 309) sound level meter
  • Comply with IEC 61672-1:2013, ANSI S1.4-1983 and ANSI S1.43-1997
  • Real-time 1/1 and 1/3 Octave in accordance with IEC61260-1:2014 and ANSI S1.11-2004
  • Linearity range: 22dBA~136dBA (BSWA 308), 25dBA~136dBA (BSWA 309)
  • Single range to cover 123dB/122dB dynamic range
  • Frequency weighting: A/B/C/Z. Time weighting: Fast/Slow/Impulse
  • 3 profile calculation in parallelwith different frequency/time weighting. 14 custom define measurement
  • Calculate SPL, LEQ, Max, Min, Peak, SD, SEL, E
  • LN statistics and time history curve display
  • User define integral period measurement, integral period up to 24h
  • High speed ARM core with FPU (Float Point Unit) to achieve wide frequency response, large dynamic range and low noise floor
  • 4G MicroSD card (TF card) mass storage
  • RS-232 remote control port
  • Mini thermal printer for measurement data print
  • Internal GPS module (option), support GPS timing


  • Basic noise measurement
  • Environmental noise assessment
  • Product quality check
  • Evaluation of noise reduction engineering

BSWA 308 is Class 1 and BSWA 309 is Class 2. Both instruments have certificated by the China CPA (Certification of Pattern Approval) and CMC?(China Metrology Certification)

Single chip high speed ARM with FPUUSB port function implemented
White backlight LCDUpdate firmware via USB (also power supply)
Integral period from 1s~24hTimer feature support auto measurement
0.1s, 0.2s, 0.5s logger step addedInternal GPS (option) with GPS timing
5 templates to save user settingSingle range to cover 123dB dynamic range
B-weighting added to meet ANSI standardReduce the noise floor (only for Class 1)
Automatic power on with external supply, ease of integrationUpper limit of measurement: 136dBrms/139dBpeak (40mV/Pa)

TypeNEW BSWA 309
AccuracyClass 2 / Type 2
StandardGB/T3785.1-2010, GB/T3785.2-2010, IEC60651:1979, IEC60804:2000, IEC61672-1:2013, ANSI S1.4-1983, ANSI S1.43-1997
OctaveReal-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 MicrophoneMPA309T: 1/2” prepolarized measurement microphone, Class 2. Sensitivity: 40mV/Pa. Frequency Range: 20Hz~12.5kHz.
Mic InterfaceTNC connecter with ICCP power supply (4mA/24V)
Detector / FilterAll float-point digital signal processing (digital detector and filter)
Integral Period1s-24h user define integral period. Repeat time: infinite, 1~9999
Measurement FunctionsLXY(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 MeasurementAutomatic measurement and log the history data
Frequency WeightingParallel A, B, C, Z (It can also be applied to 1/1 and 1/3 Octave)
Time WeightingParallel F, S, I and Peak detection
Self-noiseSound: 20dB(A), 26dB(C), 31dB(Z) Electrical: 14dB(A), 19dB(C), 24dB(Z)
Upper Limit136dB(A) Increase to 154dB(A) with 5mV/Pa Microphone
Frequency Response20Hz~12.5kHz
Linearity Range25dB(A)~136dB(A)
Dynamic Range122dB (14dB(A)~136dB(A))
Peak C Range47dB(A)~139dB(A)
Range SettingSingle range
Sampling Rate48kHz(Sampling interval for LN: 20ms)
Noise CurveTime domain noise curve display. Duration time: 1min, 2min, 10min
LCD Display160x160 LCD with white backlight, 14 step contrast level
Mass Storage4G MicroSD card (TF card)
Post-processingPost-processing software VA-SLM can read, analyze and generate reports of store data
Export DataDirectly connect to the computer to read the memory card (USB disk)
OutputAC (max 5VRMS output), DC (10mV/dB), RS-232 serial interface and USB virtual serial port
AlarmUser define alarm threshold. LED indicate the alarm status
Power Supply4x1.5V 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)
RTCBuilt-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 UpdateUpdate firmware via USB port
ConditionsTemperature: -10℃~ 50℃. Humidity: 20% ~ 90%RH
RT TemperatureReal-time temperature display on the main screen
Size (mm)W70 x H300 x D36
WeightApprox. 620g, including 4 alkaline batteries
GPS(option)Receiver Type: 50 Channels; Time-To-First-Fix: Cold Start 27s, Warm Start 27s, Hot Start 1s; Sensitivity: Tracking -161dBm, Reacquisition -160dBm, Cold Start -147dBm, Hot Start -156dBm; Horizontal position accuracy: 2.5m, Timing accuracy: 30ns, Velocity accuracy: 0.1m/s; Update Rate: 1Hz, Operation Limits: Dynamic≤4g, Altitude<50000m, Velocity<500m/s
Calibrator(option)CA111, Class 1, 94dB/114dB, 1kHz
Printer(option)Mini thermal printer, RS-232 port

BSWA 309 Class 2 Sound Level Meter

  • Brand: BSWA
  • Product Code: 309
  • Availability: Allow 2 - 3 weeks for delivery
  • $1,478.40

  • Ex Tax: $1,344.00

Available Options