BSWA309 Sound Level Meters

BSWA 309 is octave sound level meters updating the dual-core (DSP+ARM) architecture to single chip ARM with float point unit, and updating all fix-point calculation to float-point, which signif cantly improves the accuracy and stability. Re-design analog front end circuit also lower the noise fl oor and linear range of product.

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 FPU USB port function implemented
White backlight LCD Update firmware via USB (also power supply)
Integral period from 1s~24h Timer feature support auto measurement
0.1s, 0.2s, 0.5s logger step added Internal GPS (option) with GPS timing
5 templates to save user setting Single range to cover 123dB dynamic range
B-weighting added to meet ANSI standard Reduce the noise floor (only for Class 1)
Automatic power on with external supply, ease of integration Upper limit of measurement: 136dBrms/139dBpeak (40mV/Pa)

Product Features:

  ● Class 1 (New BSWA 308) and Class 2 (New BSWA 309) sound level meter

  ● Comply with IEC 61672-1:2013, ANSI S1.4-1983 and ANSI S1.43-1997

  ● 1/1  Octave in accordance with IEC61260-1:2014 and ANSI S1.11-2004

  ● Linearity range: 20dBA~134dBA (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

Product Features:

  ● Basic noise measurement

  ● Environmental noise assessment

  ● Product quality check

  ● Evaluation of noise reduction engineering

Technical Parameters: 
Type BSWA 309
Accuracy Class 2 / Type 2
Standard GB/T 3785.1-2010,  IEC 60651:1979,  IEC 60804:2000,  IEC 61672-1:2013,  ANSI S1.4-1983,  ANSI S1.43-1997

1/1 Octave, Centre Frequencies: 31.5Hz to 8kHz  GB/T 3241-2010 Class 2, IEC 61260-1:2014 Class 2 ANSI S1.11-2004 Class 2

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 Fully 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 
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 to cover whole dynamic range

Resolution 24Bits
Sampling Rate 48kHz
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 approx.10 hours (depends on battery). 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±16)℃). 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
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-needle or thermal printer, optional, RS-232 port



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