BSWA308 Sound Level Meters
BSWA 308/BSWA 309 are 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 floor 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 (BSWA 308) and Class 2 (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), 25dBA~136dBA (Class 2)
● Single range to cover 123dB/122dB dynamic range
● Frequency weighting A/B/C/Z. Time weighting Fast/Slow/Impulse
● 3 profile 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 history curve display
● User def ne 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.
Technical Parameters：
|
Specification |
|
|
Type |
BSWA 308 |
|
Accuracy |
Class 1 / Group 1 |
|
Standard |
GB/T 3785.1-2010, IEC 60651:1979, IEC 60804:2000, IEC 61672-1:2013, ANSI S1.4-1983, ANSI S1.43-1997 |
|
Octave |
1/1 Octave, Centre Frequencies: 31.5Hz to 16kHz GB/T 3241-2010 Class 1, IEC 61260-1:2014 Class 1 ANSI S1.11-2004 Class 1 |
|
Supplied Microphone |
MPA231T: 1/2” prepolarized measurement microphone, Class 1. Sensitivity: 50mV/Pa. Frequency Range: 10Hz~20kHz. |
|
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: 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 |
10Hz~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 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 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 <26s 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 thermal printer, RS-232 port |
Download information:
BSWA308/BSWA309
