Technical Parameters：

Specifications
Type	BSWA 308
Accuracy	Class 1  (Group X)
Standard	GB/T 3785.1-2010, IEC 60651:1979, IEC 60804:2000, IEC 61672-1:2013, ANSI S1.4-1983, ANSI S1.43-1997
Octave1	Real-time 1/1 Octave (Option): 8 Hz~16 kHz   Real-time 1/3 Octave (Option): 6.3 Hz~20 kHz   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: 40 mV/Pa.  Frequency Range: 3 Hz~20 kHz.
Mic Interface	TNC connecter with ICCP power supply (4 mA)
Detector / Filter	Fully float-point digital signal processing (digital detector and filter）
Integral Period	Infinite or 1s~24h user define integral period. Repeat time: Infinite or 1~9999
Logger Step	0.1s, 0.2s, 0.5s, 1 s~24h (Optional function)
Measurement Functions	LXY(SPL), LXeq, LXeq1s, LXIeq, LXYSD, LXSEL, LXE, LXYmax, LXYmin, LXPeak, LDay, LEvening, LNight, Ldn, Lden,  LXYN. Where X is the frequency weighting: A, B, C, Z; Y is time weighting: F, S, I; N is the statistical percentage: 1~99.3 profile and 14 custom define measurement are calculate in parallel with different frequency/time weighting.  (All above are optional functions, except for LXY(SPL), LXeq, LXYmax, LXYmin, LXPeak)
24h Measurement	Automatic measurement based on user define date/time and save 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-Noise2	Sound: 19 dB(A), 25 dB(C), 31 dB(Z) Electrical: 13 dB(A), 17 dB(C), 24 dB(Z)
Upper Limit2	136 dB(A) Increase to 154 dB(A) with 5 mV/Pa Microphone
Frequency Response1	10 Hz ~ 20 kHz
Level Linearity Range2,3,4	22 dB(A)~136 dB(A) Octave:30 dB~136 dB
Dynamic Range2	123 dB (13 dB(A)~136 dB(A))
Peak C Range2,3	47 dB ~ 139 dB
Electrical Input	Maximum input voltage: 5 Vrms (7.07 Vpeak). Input impedance of preamplifier: >6 GΩ
Range Setting	Single range to cover whole dynamic range
Resolution	24 Bits
Sampling Rate	48 kHz (Sampling interval for LN: 20 ms)
Time History	Time domain noise curve display. Duration time: 1 min, 2 min, 10 min
LCD Display	160x160 LCD with white backlight, 14 step contrast level, 1s display update rate
Mass Storage	8 G 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 Output (max 5 VRMS, ±15 mA), DC Output (10 mV/dB, max 15 mA),   RS-232 serial interface and USB (USB disk mode or modem mode)
Alarm	User define alarm threshold. LED indicate the alarm status
Setup Template	5 templates to save user setup for different application, template can be save in MicroSD card
Auto Power On	Automatic power on and start measurement when power supply available, ease of integration (Optional function)
Power Supply	4x1.5 V 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 500 mA) and USB power (5V 1A)
RTC	Built-in backup battery has been calibrated at factory to the error <26s in 30 days (<10 ppm, (25±16) ºC). It can keep RTC running when replacing the main batteries. GPS timing function available (option with GPS module)
Language	English, Chinese, Portuguese, Spanish, German, French
Firmware Update	Update firmware via USB port
Conditions	Temperature: -10 ºC~50 ºC. Humidity: 20%~90% RH
RT Temperature	Real-time temperature display on the main screen
Size (mm)	W70 x H300 x D36
Weight	Approx. 620 g, including 4 alkaline batteries
Option
GPS(option)	Receiver Type: 50 Channels; Time-To-First-Fix: Cold Start 27s , Warm Start 27 s, Hot Start 1 s; Sensitivity: Tracking -161 dBm, Reacquisition -160 dBm, Cold Start -147 dBm, Hot Start -156 dBm; Horizontal position accuracy: 2.5 m, Timing accuracy: 30 ns, Velocity accuracy: 0.1 m/s; Update Rate: 1 Hz, Operation Limits: Dynamic≤4 g, Altitude<50000 m, Velocity<500 m/s
Calibrator	CA111, Class 1, 94 dB/ 114 dB, 1 kHz
Printer	Mini thermal or dot-matrix printer, RS-232 port
Extension	Extension cable (user defined length) and BM200A/B microphone boom (2m)

Note 1:  Ignore the result outside 20Hz~12.5kHz for type BSWA 309 alone due to microphone frequency response of Class 2.  

Optional Function
Basic (must option)	LXY(SPL), LXeq, LXYmax, LXYmin, LXPeak.  Where X is the frequency weighting: A, B, C, Z; Y is time weighting: F, S, I.
Statistical	LXeq1s, LXIeq, LXYSD, LXSEL, LXE, LDay, LEvening, LNight, Ldn, Lden, LXYN. Where X is the frequency  weighting: A, B, C, Z; Y is time weighting: F, S, I; N is the statistical percentage: 1~99. 3 profile and 14 custom define measurement are calculate in parallel with different frequency/time weighting.
1/1 Octave	Real-time 1/1 Octave, Class 1: 8 Hz~16 kHz, Class 2: 16 Hz~8 kHz
1/3 Octave	Real-time 1/3 Octave, Class 1: 6.3 Hz~20 kHz, Class 2: 16Hz~12.5 kHz
Storage	Save SWN, CSD, OCT files into MicroSD card (TF card)
Auto Power On	Automatic power on and start measurement when power supply available, ease of integration

Download information:

BSWA308/BSWA309

Common Questions About Sound Level Meters (FAQ)