New BSWA 308


NEW BSWA 308/NEW BSWA 309 are new generation digital sound level meter upgrade from base BSWA 308/309. 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 of sound level meter.

Brush firmware software
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 (Class 1), 24dBA~136dBA (Class 2)

● Single range to cover 123dB dynamic range

● Frequency weighting A/B/C/Z. Time weighting Fast/Slow/Impulse

● 3profile calculation in parallel with different frequency/time weighting. 14 custom define measurement

● Calculate SPL, LEQ, Max, Min, Peak, SD, SEL, E

● LN statistics and time-domain curve display

● User define integral period measurement

● High speed ARM with FPU (Float Point Unit) to achieve wide 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)

Technical Parameters:
Type NEW BSWA 308
Accuracy Class 1 / Type 1
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: 8Hz~16kHz Optional Real-time 1/3 Octave: 6.3Hz~20kHz GB/T 3241-2010, IEC 61260-1:2014 ANSI S1.11-2004. Base 10 system
Supplied Microphone MPA231T: 1/2” prepolarized measurement microphone, Class 1. Sensitivity: 50mV/Pa. Frequency Range: 6.3Hz~20kHz.
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: 18dB(A), 23dB(C), 31dB(Z) Electrical: 11dB(A), 16dB(C), 21dB(Z)
Upper Limit 134dB(A) Increase to 154dB(A) with 5mV/Pa Microphone
Frequency Response 6.3Hz~20kHz
Linearity Range 20dB(A)~134dB(A)
Dynamic Range 123dB (11dB(A)~134dB(A))
Peak C Range 45dB(A)~137dB(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
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


Brush firmware software

Product manual 3v16