BSWA 308 User manual

BSWA 308/309
Sound Level Meter
User Manual
BSWA TECH
IEC 60651
IEC 60804
IEC 61672-1
GB/T 3785.1
GB/T 3785.2
JJG 188-2002

BSWA308/309 Sound Level Meter User Manual
BSWA-III-C021-04-P0274
v3.16
Copyright © 2020 BSWATechnology Co., Ltd
The specification of product is subject to changes without notice
www.bswa-tech.com
Dec. 2020

BSWA308/309 BSWA Technology Co., Ltd
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Change History
Version
Date
Changes
Handle by
1.00
2010.9.17
Originalversion.
ZhaoDW, Qiao J
1.04
2011.3.11
Addnewfeatures.
ZhaoDW, Qiao J,
HuangShan
2.00
2011.9.19
Add RS-232protocol.
HuangS,Qiao J
2.05
2013.8.14
Updatethe storage module, addcurrent save and
GPS module.
HuangS,Wang
LZ,ZhaoQY
3.0
2015.3.25
Updatenewversion 308/309features.Add firmware
updateintroduction.
QiaoJie,
HuangShan
3.1
2015.6.30
Addcorrectionsand datarequired byIECstandard
QiaoJ,HuangS
3.2
2015.10.29
AddapplicationnoteinRS-232hardwareconnecting.
QiaoJ,HuangS
3.3
2016.04.26
Modify1/1octaveandadd1/3octave.
QiaoJ,HuangS
3.4
2016.09.19
Addthe specificationof samplingintervalforLN
QiaoJie
3.5
2017.01.18
AddRoHSverificationreport
QiaoJie
3.6
2017.04.07
Fixthe error of1/3octavedescription.
QiaoJie
3.7
2017.05.05
Change some texterror.
QiaoJie
3.8
2017.11.06
Add descriptionof DCOUTpin definition. Add
parameter “3” to all query instruments.
HuangShan,
QiaoJie
3.9
2019.04.02
Addthe descriptionof“Pause”and “Back Erase”
QiaoJie
3.10
2019.10.08
Addthe description of some issue about GPS.
QiaoJie
3.11
2020.03.11
Addoverload/under-range indicatorto instructions of
DMA, TPR, DLN, DCU, DSL, DTR, DOT, DTT.
HuangShan,
QiaoJie
3.12
2020.05.09
Addparameterstoinstructionsof STA, OCS.
HuangS,Qiao J
3.13
2020.08.03
Split five functions.Add LXIeq quantity.
HuangS,Qiao J
3.14
2020.08.28
AddLdnandLden.Addoutdoor noise instruction.
QiaoJie
3.15
2020.10.20
Add4.4.6RTCCalibration
QiaoJie
3.16
2020.12.14
Addthe queryandsetinstructionsforLden period.
HuangS,Qiao J
This material, including documentation and any related computer programs, is
protected by copyright controlled by BSWA. All rights are reserved. Copying,
including reproducing, storing, adapting or translating any or all of this material
requires the prior written consent of BSWA. This material also contains confidential
information, which may not be disclosed to others without the prior written consent of
BSWA.
BSWA and its logo designs are registered trademarks of BSWA Technology Co., Ltd.. Other
product or company names mentioned herein are trademarks or business names of their
respective owners.
There is no warranty, position or other implication of any kinds in this manual. BSWA and its
employees are not liable for any direct or indirect loss of data, benefits, etc. due to any
information contained or mentioned in this manual. BSWA has the final authority to interpret
this manual.

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Contents
Change History...............................................................................................................1
Contents.........................................................................................................................2
Appearance....................................................................................................................6
Buttons of Operation.......................................................................................................7
1. Introduction.................................................................................................................8
1.1 General Description.................................................................................................8
1.2 Applications.............................................................................................................8
1.3 Features..................................................................................................................8
1.4 Function Upgrades..................................................................................................9
1.5 Spectification...........................................................................................................9
1.6 Information for Periodic Tests ................................................................................12
1.7 Key Component ....................................................................................................13
1.8 Packing List...........................................................................................................13
1.9 Packing Drawing ...................................................................................................14
1.10 China Certification of Pattern Approval (CPA) ......................................................15
1.11 China Metrology Certification (CMC)....................................................................16
1.12 CE Certification ...................................................................................................17
1.13 RoHS Verification Report.....................................................................................18
2. The Appearance and Operation.................................................................................19
2.1 Keypad..................................................................................................................19
2.2 Microphone Connector..........................................................................................20
2.3 Windscreen...........................................................................................................21
2.4 Data and Power Supply Connector........................................................................22
2.5 Battery..................................................................................................................23
2.6 GPS......................................................................................................................24
3. Measurement Screen................................................................................................26
3.1 Icons and Meaning of Screen Display....................................................................26
3.2 Screen of Level Meter Mode..................................................................................28
3.3 Screen of 1/1 Octave Mode...................................................................................30

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3.4 Screen of 1/3 Octave Mode...................................................................................30
4. Operation and Setting of the Menu............................................................................32
4.1 Function................................................................................................................32
4.2 Calibration.............................................................................................................33
4.2.1 Calibration by Measurement.............................................................................33
4.2.2 Calibration by Cal.Factor ..................................................................................33
4.2.3 Conversion of Cal.Factor and Sensitivity...........................................................33
4.2.4 Process of Calibration by Measurement............................................................34
4.3 Measurement........................................................................................................36
4.3.1 MEAS.Setup.....................................................................................................36
4.3.2 Pause Measurement and Back Erase...............................................................38
4.3.2 MEAS.Range....................................................................................................39
4.3.3 ICCP Power......................................................................................................39
4.3.4 Profile 1~3........................................................................................................40
4.3.5 Alarm Threshold ...............................................................................................40
4.3.6 Extended Function............................................................................................41
4.3.7 Statistical..........................................................................................................41
4.3.8 Time History .....................................................................................................42
4.3.9 Octave..............................................................................................................42
4.3.10 Custom Measure ............................................................................................42
4.3.11 Timer ..............................................................................................................43
4.3.12 24h Measurement by Timer ............................................................................44
4.3.13 Lden Period....................................................................................................45
4.4 Setup....................................................................................................................45
4.4.1 Contrast............................................................................................................45
4.4.2 Backlight...........................................................................................................46
4.4.3 Battery..............................................................................................................46
4.4.4 Trigger..............................................................................................................46
4.4.5 Date & Time......................................................................................................47
4.4.6 RTC Calibration................................................................................................49

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4.4.7 Auto PWR Off...................................................................................................50
4.4.8 RS-232.............................................................................................................50
4.4.9 File Manager ....................................................................................................51
4.4.10 Boot Mode......................................................................................................52
4.4.11 USB Mode......................................................................................................53
4.4.12 GPS ...............................................................................................................54
4.4.13 Setup Template...............................................................................................54
4.4.14About..............................................................................................................55
4.5 Language..............................................................................................................55
4.6 Output...................................................................................................................55
4.6.1 AC OUT............................................................................................................55
4.6.2 DC OUT ...........................................................................................................56
4.6.3 Printer ..............................................................................................................56
4.7 Factory Settings....................................................................................................57
5. RS-232 Communication Protocol ..............................................................................58
5.1 Hardware Configuration and Settings of Interface..................................................58
5.2 Transfer Protocol...................................................................................................58
5.2.1 Start/Stop of the Block Transfer ........................................................................59
5.2.2 Device ID..........................................................................................................59
5.2.3 ATTR Attribute Character ..................................................................................59
5.2.4 BCC (Block Check Character)...........................................................................60
5.2.5 Block Transfer Format.......................................................................................60
5.2.6 Recovery from Transmission Errors..................................................................61
5.2.7 Flow Control.....................................................................................................62
5.2.8 Multi-Machine Operation...................................................................................62
5.2.9 Rated Parameters ............................................................................................63
5.3 Instruction.............................................................................................................63
5.3.1 Instruction List ..................................................................................................65
5.3.2 Instruction Format.............................................................................................68
5.3.3 Instruction Describe..........................................................................................69

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6. Operation Notes......................................................................................................107
6.1 Operation............................................................................................................107
6.2 Common Issue and Solutions..............................................................................107
6.3 Calibration...........................................................................................................108
6.4 Firmware Update.................................................................................................108
6.4.1 Install USB Driver...........................................................................................108
6.4.2 Firmware Update Procedure...........................................................................109
6.5 Warranty ............................................................................................................. 110
6.6 Customer Service Phone Number ........................................................................111
Annex 1 Glossary ....................................................................................................... 112
Annex 2Adjustments at the Calibration Check Frequency........................................... 114
Annex 3 Corrections for the Typical Effects of Reflections from the Case of Sound Level
Meter and Diffraction of Sound around the Microphone................................. 115
Annex 4 Corrections of Windscreen in Free Field........................................................ 116
Annex 5 Corrections of ElectrostaticActuator.............................................................. 117
Annex 6 Typical Frequency Response and Corresponding Upper Limit....................... 118
Annex 7 Specification of 1/1 Octave Band Filter.......................................................... 119
Annex 8 Specification of 1/3 Octave Band Filter..........................................................120
Annex 9 Mid-band Frequencies for 1/1 Octave Band and 1/3 Octave Band Filters.......123

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Appearance
Power Jack
(7V~14V)
Trigger DC Output AC Output
Microphone and preamplifier
1/4”thread
Battery
LR6/AA/AM3
Cover lock:
Left◄: unlock
Right►: locked
Non-slip
surface
LCD with
backlight
LED indicator

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Buttons of Operation
LED indicator
<Power>
LCD Screen
<ESC/Back Erase>
<Enter>
Arrow keys
<▲><▼>
<◄><►>
<Menu/Pause>
<Start/Stop>
<Backlight>

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1. Introduction
1.1 General Description
The new BSWA 308/309 are new generation octave sound level meter upgrade from base
BSWA 308/309 to meet the market demand. It fulfill the 1/1 octave and 1/3 octave
requirement of IEC standard and China GB/T standard.
The BSWA 308/309 is a digital sound level meter which design and manufacture by BSWA.
The use of high precision 24 Bits AD converter makes the instruments to be an ideal choice
for performing many kinds of measurement, for example, environmental noise, vehicle noise
and industrial application.
The new types upgrade the dual-core (DSP+ARM) architecture to single chip ARM with float
point unit, 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 and linear
range of product. The new developed algorithm brings a single measurement range which
can cover more than 120dB dynamic range while still meets the standard.
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).
1.2 Applications
Basic noise measurement
Environmental noise assessment
Product quality check
Evaluation of noise reduction engineering
1.3 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
Real-time 1/1 and 1/3 Octave in accordance with IEC 61260-1:2014 and ANSI S1.11-2004
Linearity range: 22dBA~136dBA (BSWA 308), 25dBA~136dBA (BSWA 309)
Single range to cover 123dB (BSWA 308) / 122dB (BSWA 309) dynamic range

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Frequency weighting: A/B/C/Z. Time weighting: Fast/Slow/Impulse
3-Profile and 14 custom define measurement are calculate in parallel with different
frequency/time weighting
Calculate SPL, LEQ, Max, Min, Peak, SD, SEL, E, Lday, Levening, Lnight, Ldn, Lden
LN statistical and time history curve display
User define integral period measurement, integral period up to 24h
High speedARM 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
1.4 Function Upgrades
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 for 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)
1.5 Spectification
Specifications
Type
BSWA308
BSWA309
Accuracy
Class 1 (Group X)
Class 2 (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-time1/1Octave(Option): 8Hz~16kHz
Real-time1/3Octave(Option):6.3Hz~20kHz
Real-time1/1Octave(Option): 16Hz~8kHz
Real-time1/3Octave(Option):16Hz~12.5kHz

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GB/T 3241-2010, IEC 61260-1:2014
ANSI S1.11-2004. Base 10 system.
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: 40mV/Pa. Frequency
Range: 3Hz~20kHz.
MPA309T: 1/2” prepolarized
measurement microphone, Class
2. Sensitivity: 40mV/Pa. Frequency
Range: 20Hz~12.5kHz.
Mic Interface
TNC connecter with ICCP™(IEPE Type) power supply (4mA)
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, 1s~24h
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: 19dB(A), 25dB(C), 31dB(Z)
Electrical: 13dB(A), 17dB(C), 24dB(Z)
Sound: 20dB(A), 26dB(C), 31dB(Z)
Electrical: 14dB(A), 19dB(C), 24dB(Z)
Upper Limit2
136dB
Increase to 154dB with 5mV/Pa
Microphone
136dB
Increase to 154dB with 5mV/Pa
Microphone
Frequency
Response1
10Hz~20kHz
20Hz~12.5kHz

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Level Linearity
Range2, 3, 4
22dB(A)~136dB
Octave: 30dB~136dB
25dB(A)~136dB
Octave: 33dB~136dB
Dynamic Range2
123dB (13dB(A)~136dB)
122dB (14dB(A)~136dB)
Peak C Range2, 3
47dB~139dB
50dB~139dB
Electrical Input
Maximum input voltage: 5Vrms (7.07Vpeak). Input impedance of
preamplifier: >6GΩ
Range Setting
Single range to cover whole dynamic range
Resolution
24Bits
Sampling Rate
48kHz (Sampling interval for LN: 20ms)
Time History
Time domain noise curve display. Duration time: 1min, 2min, 10min
LCD Display
160x160 LCD with white backlight, 14 step contrast level, 1s display
update rate
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 Output (max 5VRMS, ±15mA), DC Output (10mV/dB, max 15mA),
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
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 <26s in
30days (<10ppm, (25±16) ºC). It can keep RTC running when replacing
the main batteries.

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GPS timing function available (option with GPS module)
Language
English, Chinese, Portuguese, Spanish, German, French
Firmware Update
Update firmware via USB port
Conditions
Temperature: -10ºC~50ºC. 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
Option
GPS
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
CA111, Class 1, 94dB/114dB, 1kHz
Printer
Mini thermal or dot-matrix printer, RS-232 port
Note 1: Ignore the result outside 20Hz~12.5kHz for type BSWA 309 alone due to microphone
frequency response of Class 2.
Note 2: The data was measured with 40mV/Pa microphone for BSWA 308 and BSWA309.
Note 3: Measurement according to GB/T 3785 and IEC 61672.
Note 4: Measurement according to GB/T 3241 and IEC 61260.
1.6 Information for Periodic Tests
Reference sound level: 94.0dB.
Reference incidence direction: parallel to the incident direction of the microphone.
Reference point of microphone: the central point of microphone diaphragm.
Reference incidence direction: direction perpendicular to the microphone diaphragm.
Reference attenuation of octave spectra: 0dB.
Reference input signal level of octave spectra: 40mV (94dB for sensitivity of 40mV/Pa).

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1.7 Key Component
Component Name
Manufacturer
Type
Description
Microphone
BSWATechnology
Co., Ltd.
MP231
Class 1 microphone
MP309
Class 2 microphone
1.8 Packing List
No.
Type
Description
Standard
1
BSWA308/309
Sound level meter without microphone
2
CC308 Case
Carrying case
3
MA231T
ICCP preamplifier with TNC connector
4
MP231/MP309
Class 1 (308) or class 2 (309) microphone
5
WS002-9 Windscreen
90mm diameter windscreen for 1/2”microphone
6
MicroSD Card
4G memory card to store data
7
Battery
Alkaline battery (LR6 / AA / AM3) x 4
8
Power Adapter
Power adapter with 9V/500mA
9
MiniUSB Cable
Use to connect computer
10
Quick Start Guide
Quick start guide
11
Certificate of Calibration
Certificate of factory calibration
12
CD
Include post-process software, user manual (pdf), driver,
firmware and other utility
13
Certificate of Conformity
Certificate of conformity
Option
14
GPS
GPS module and antenna
15
Sound Calibrator
CA111: class 1 calibrator, 94dB/114dB
CA114: class 2 calibrator, 94dB
CA115: class 2 calibrator, 114dB
16
Thermal Printer
Mini thermal printer without ribbons, RS232 connector
17
Tripod
Stand for sound level meter
18
Printed User Manual
Printed user manual
19
Test Report
Test report from metrology institute

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1.9 Packing Drawing
★Note: The detail of packing items may vary to follow orders.

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1.10 China Certification of Pattern Approval (CPA)
CPA of BSWA 308
2014S226-11
CPA of BSWA 309
2012S233-11

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1.11 China Metrology Certification (CMC)
CMC of BSWA 308
京制 01020122号
CMC of BSWA 309
京制 01020122号

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1.12 CE Certification

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1.13 RoHS Verification Report