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General Introduction

Model ST-11D Sound level meter is a digital and multifunction sound level meter with 
modular design. Its measurement solution is in accordance with IEC 61672: 2013 Class 1 
standard and its sensitivity for emission in radio frequency filed is classified as group X.
The meter has adopted advanced digital detection technology and has automatic range 
conversion, reliable and steady performance, wide linear operating range etc. The shell 
adopts ABS engineering plastic with beautiful shape, light-weight and is easy to carry. 
The power consumption of it is small. Through the RS-232 digital output interface, users 
can use a computer remotely to control telemetry, also set a network with computer 
control and measurements.
It is applied widely in the measurement of noise produced by various machines, vehicle, 
boat, electro etc. Also can be used to measure environmental noise and industrial 
noise, e.g. labor protection, industrial hygiene.

Technical Specification

1

LFp, LSp, LIp, Leq1, Lpeak, Leq,T, LFmax, 
LFmin, LSmax, LSmin, LImax, LImin, 
SEL,Ts, Tm, Volt, E.

Noise Integrating Measurement

 

LFp, LSp, LIp, Leq,t, Lpeak, Leq,T, LFmax, 
LFmin, LSmax, LSmin, LImax, LImin< SEL, 
Lex8h, LAVG, TWA, DOSE, Ln1, Ln2, Ln3, 
Ln4, Ln5, SD, Ts, Tm, Volt, E.
Stores 8000 groups measurement results 
including Timestamp, %Dose, TWA

Sound Level Meter/ Noise Dosimeter/ 
Data logging & Precision recording(Opt)

IEC 61672:2013 Class 1

10 Hz~20 kHz

27~140 dB

±0.7 dB 

0.1dB

A, C, Z, B

F, S, I, Peak

1s~24h

310×72×32 mm

128×64 OLED 

0.4kg

4x AAA Batteries or external power supply

AC, DC, RS-232, USB interface

Air temperature: -15°C~+50 °C 

Relative humidity: 10 %~90 % 

Air pressure: 65 kPa~108 kPa

ST-11/11D Sound Level Meter, Calibration Certificate, Class 1 Field Calibrator (OPTIONAL), 

1/2" Prepolarized Condenser Microphone, Windscreen, RS232 Cable, Mini USB Cable 

(ST-11D only), User Manual, Waterproof Carrying Case.

-

Fulfils Standard
Normal frequency
Measurement range
Accuracy
Resolution
Frequency Weighting
Time Weighting
Integrating time
Dimensions
Display
Weight
Main Parameters of 
Measurement

Datalogging

Power Supply
Output Interface
Application

Operation Environment 

Package Contents

ST-11

Model

ST-11D

Summary of Contents for ST-11D

Page 1: ...ST 11D User Guide Sound Level Meter ...

Page 2: ...Note the condition of the unit clearly and contact the supplier The unit should be protected from shocks and vibration To avoid damage caused by battery leakage please take out the battery when not using the meter For storing or operating the unit Avoid locations which 1 May be subject to adverse influences such as from high temperature or high humidity air with high salt or corrosive content or g...

Page 3: ... display interface 6 4 Setup1 submenu 6 4 1 Page 1 6 4 2 Page 2 6 4 3 Page 3 6 4 4 Page 4 6 5 Setup2 submenu 6 5 1 Starting setup 6 5 2 Auto pause Restart setup 6 5 3 Hardware setup 6 5 4 Calendar clock adjustment 6 5 5 Logging setup Optional 6 5 6 Recording setup Optional 6 6 Data submenu 6 6 1 Data recall 6 6 2 Clear all 6 6 3 Turn to U disk mode 6 7 Information of instrument Appendix A Appendix...

Page 4: ...ecification 1 LFp LSp LIp Leq1 Lpeak Leq T LFmax LFmin LSmax LSmin LImax LImin SEL Ts Tm Volt E Noise Integrating Measurement LFp LSp LIp Leq t Lpeak Leq T LFmax LFmin LSmax LSmin LImax LImin SEL Lex8h LAVG TWA DOSE Ln1 Ln2 Ln3 Ln4 Ln5 SD Ts Tm Volt E Stores 8000 groups measurement results including Timestamp Dose TWA Sound Level Meter Noise Dosimeter Data logging Precision recording Opt IEC 61672...

Page 5: ...enuation reference level linear range 95 dB 9 Display 128 64 OLED 10 Output interface AC DC RS 232 USB interface 11 Calibration use Model ST 120 sound level calibrator to conform specifications of IEC 60942 for Class 1 for the performance class 12 Power battery 4 LR 6 work at least 6 hours successively Lithium battery work at least 16 hours successively when it is fully charged External power 5V 9...

Page 6: ...Main Parameters of Measurement ST 11D LFp LSp LIp Leq t Lpeak Leq T LFmax LFmin LSmax LSmin LImax LImin SEL Lex8h LAVG TWA DOSE Ln1 Ln2 Ln3 Ln4 Ln5 SD Ts Tm Volt E Note the n1 to n5 in Ln1 Ln5 can be chosen from 1 to 99 18 Memory capacity 2GB in ST 11D model 19 Logging and recording optional in ST 11D model 20 Lithium battery optional built in charger module can be charged with 5V external power s...

Page 7: ...e 2 The outline of the sound level meter is sharp to reduce the reflection of the sound wave The nominal influence caused by the reflection on the shell and the indication features under different incidence direction can be found in Appendix 3 The shell is mold with ABS plastic The batteries are put in battery box which is very convenient for users to replace the batteries just by taking off the b...

Page 8: ...er down Power on or reset the meter Enter the next menu or Input the current operation Exit from the current menu or keep pressing for 3s to power off the meter Move cursor to next position Move cursor to former position Parameter data which the cursor points increases Parameter data which the cursor points decreases Power Signal Ground 5 ...

Page 9: ...only two serial output signals the pins are defined as follow 1 External power input 4 5V 9V output batteries voltage 2 Empty 3 PWM output 4 RXD 5 TXD 6 Reset at ordinary times should be hung up heightening level will be reset 7 Power control at ordinary times should be hung up heightening level will turn on instrument power supply 8 GND Fig 5 AC and DC output 1 Power 2 Empty 3 PWM 4 RXD 5 TXD 6 R...

Page 10: ...l power supply The Sound Level Meter can be connected with external power through the φ1 1 external power socket at the lower right of the instrument At this time the inner battery will be cut off automatically The voltage range of the external power supply is 4 5V 9V The shell of plug is the cathode and the core of plug is the anode When the Sound Level Meter is used continuously for a long time ...

Page 11: ... press key then enter submenu of Calibration See as follows There are two kinds of battery 4 LR03 batteries or Lithium batteries While operating the meter will check battery power automatically if it is low the under volt age indicator will be lighted up which reminds users to change batteries After changing the batteries the meter will operate normally again When the lithium batteries are low in ...

Page 12: ...r calibration setup interface The following message appears Serial Serial number of the microphone set by the producer It cannot be modified MIC Sen Sensitivity level of the microphone You can adjust the sensitivity level of the microphone by pressing or key Cali SPL Sound pressure level of the calibrator If your calibration SPL is not 94 0 dB press or key to make it reach the output SPL of the ca...

Page 13: ... Press key and the instrument will ask you whether to delete the calibration history If press key again all of the calibration histories will be erased After pressing key the instrument does self check and shows the Host Number Microphones Number Model and Configuration Number as follows Move the cursor to 1 and press key the display will show as follows 5 3 Calibration history list 6 1 main menu ...

Page 14: ...or can be moved to List C LFp LSp LIp When cursor is at C press or key can change the weighting to Z when cursor is at LFp LSp or LIp press or key can change to other measurement parameters such as LFp LSp LIp Leq t Lpeak Leq T LFmax LFmin LSmax LSmin LImax LImin SEL Lex8h LAVG TWA DOSE L5 L10 L50 L90 L95 SD Ts Tm Volt Date Time and E The last row LW is the logging and sound recording function ope...

Page 15: ...r 4 charac ters will be kept as the former 4 characters of the file name saved in USB flash disk The instrument can save 128 measurement group names at most You can write new names by PC P 1 page 1 The cursor can be moved between P Work Mode Auto name and Name Press or key and to be back to the main menu Table 2 the cursor location and the relevant available options on page1 Ts 00h00m00s preset me...

Page 16: ... mode are optional means free field type and random incidence type The ST 11 is equipped with free field microphone by the producer If random incidence microphone is requested by some countries standards change the option to Random so the instrument will automatically modify the high frequency to meet the request of frequency response of random incidence microphone Language Chinese and English Ran...

Page 17: ...ower supply clock logging and recording Move the cursor on P 1 then press or key and enter page 2 The screen displays as follows If the user already has authorization of data logging and recording software move the cursor to P 2 press or key and enter page3 The screen displays as follows Otherwise it will remind user to input a 14 bit authorization code When on page 1 under setup 2 interface move ...

Page 18: ...e and Second either and use or key to adjust the time When a parameter reaches its end it displays which means the parameter does not participate in comparison The instrument can be triggered once an hour once a day or once a month When choosing Button the screen displays as follows Table 3 Applications of the trigger sources 6 5 1 1 The timing start 6 5 1 2 Button start No 1 2 3 4 5 Source Clock ...

Page 19: ...inutes Note when Ts is longer than this interval the actual measurement time is according to Ts and the starting time will be delayed Value the preset limit value If the value is being exceeded the instrument will start measuring The value can be set between 40 140 Delay the continuous limit surpassing time The instrument starts measurement when the time weighted average index SPL for analysis of ...

Page 20: ...to adjust the time When a parameter reaches its end it displays which means the parameter does not participate in comparison when auto on or auto off The instrument can switch on or off once an hour once a day once a month It is suggested to use Auto pause or Restart function together with Timed Activation function to make automatic measurement Move the cursor to the second and third row under set...

Page 21: ...ss or key can change Auto off between invalid and 10s 20 s 30 s 40 s 50 s 60 s 70s 80s 90s The value of Limit is limit value on the third row When the instrument is under the measuring interface the measured instantaneous sound pressure level is greater than the limit value Lamp light at the bottom of the instrument will be lighted up for at least one second Move the cursor to Limit and press or k...

Page 22: ... It displays as follows Type recording mode N A 48kHz 16bit 24kHz 16bit 12kHz 8bit optional Fig 31 RTC clock setup Fig 32 Logging setup Fig 33 Recorder setup Table 5 Logging content content N A Linst Leq t and Li Leq optional Sample Sample interval You can set the parameter from 0 01s to 6s when Linst is chosen If Leq t is chosen you can set the parameter from 0 1s to 60 0s 6 5 5 Logging setup Opt...

Page 23: ...n the average index SPL for analysis of relevant channel surpasses it The value can be set among 1 120 Record time Time for limit surpassing recording activation 10s 20s 30s 40s 50s 60s 70s 80s and 90s are optional If Synchrony is chosen on the last page Ts is displayed and setup cannot be set Move the cursor on 3 Data on the main menu and enter submenu of data manage ment It displays as follows M...

Page 24: ... is recording results of waves and cannot recall data The instrument displays group serial number with measurement date or measurement time by pressing or key Press Cursor key and the cursor can be moved to the next row When the cursor is moved to the bottom of the screen the screen will automatically turn the pages when reach the bottom of the file list the screen will return to page1 You can pre...

Page 25: ...l the data in the instrument press key otherwise press other key to return Move the cursor on 5 Info on the main menu and press key instrument informa tion interface is entered See as follows Press key while the cursor staying on the second row on data management submenu the instrument will turn the stored data in FAT32 format to let the data be read correctly when the instrument is connected to P...

Page 26: ...rument Free Blocks 8062 8062 Blocks are available for 8062 groups of data to be saved Made 2011 11 4 The instrument was manufactured on Nov 1 2011 Press or key under this interface then enter clock display interface See as follows Current time is displayed under the interface If you press Cursor key or key it will change the display time If you press key at the calendar clock page the instrument w...

Page 27: ...Appendix A Nominal free field response of AWA14425 type test capacitor microphone in the reference direction Appendix B 24 ...

Page 28: ...Appendix C The free field response of sound level meter in different directions under no wind condition and installed with φ35 60 windscreen 25 ...

Page 29: ...Appendix D The frequency Response of free field Type and Random Type microphone when directivity is 90 degrees in the free field 26 ...

Page 30: ...n 10s Equivalent continuous SPL T is the average integral time which can be set casually from 1 second to 24 hours Peak SPL maximum sound pressure level F weighted minimum sound pressure level F weighted maximum sound pressure level slow detector minimum sound pressure level slow detector I weighted maximum SPL I weighted minimum SPL Sound exposure level Personal sound exposure expressed in Pa2h e...

Page 31: ...outside of these temperature ranges Avoid exposing the instrument to direct sunlight even the the air temperature is within the limits Operating humidity The instrument is designed to work in humidity 80 rh and stored in dry place where humidity is less than 70 rh Store microphone carefully Microphone is the key component of the instrument and keep it dry and avoid severe shake or vibration Operat...

Page 32: ...Scarlet Tech Co Ltd 2015 Scarlet Tech Co Ltd All rights reserved 4F 3 No 347 HePing E Rd 2nd Sec DaAn District Taipei City 106 Taiwan info scarlet com tw www scarlet tech com version 200803 ...

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