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：

Type

Accuracy

Standard

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

MPA231T: 1/2” prepolarized measurement microphone, Class 1. Sensitivity: 50mV/Pa. Frequency Range: 10Hz~20kHz.

TNC connecter with ICCP power supply (4mA/24V)

Fully float-point digital signal processing (digital detector and filterIntegral Period

Measurement Functions

24h Measurement

Frequency Weighting

Time Weighting

Self-noise

Upper Limit

Frequency Response

Linearity Range

Dynamic Range

Peak C Range

Range Setting

Single range to cover whole dynamic range

24Bits

48kHz

Time domain noise curve display. Duration time: 1min, 2min, 10min

160x160 LCD with white backlight, 14 step contrast level

4G MicroSD card (TF card)

Post-processing software VA-SLM can read, analyze and generate reports of store data

Directly connect to the computer to read the memory card (USB disk)

AC (max 5VRMS output), DC (10mV/dB), RS-232 serial interface and USB virtual serial port

User define alarm threshold. LED indicate the alarm status

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)

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)

Update firmware via USB port

Temperature: -10℃~ 50℃. Humidity: 20% ~ 90%RH

Real-time temperature display on the main screen

W70 x H300 x D36

Approx. 620g, including 4 alkaline batteries

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

CA111, Class 1, 94dB/114dB, 1kHz

Mini thermal printer, RS-232 port