Scarlet Tech ST-11D User manual
ST-11D
User Guide
Sound Level Meter
Precaution
*Please read the manual carefully before using the meter.
*Do not touch any parts of the unit only if necessary for operation.
*Do not disassemble or modify the unit.
*In case of malfunction, do not attempt to do any repairs.
*The warranty doesn’t apply to damage on the meter diaphragm and other improper use.
*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 gases from chemicals.
2. May be subject to splashes of water or direct sunlight, excessive dust or dirt accumu
lation.
Contents
1. General Introduction
2. Specification
3. Structure features and function
4. Operation before measurement
4.1 Check list
4.2 Use of windscreen
4.3 External power supply
4.4 Check and change of battery
5. Calibration
5.1 Acoustic calibration
5.2 Calibration setup
5.3 Calibration history list
6. Operation of ST-11
6.1 Main menu
6.2 DISP display interface
6.3 List 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 B
Appendix C
Appendix D
Appendix E: vocabulary of terms
Warranty
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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-11Model ST-11D
Specification
(1) Microphone: Φ12.7mm (1/2'') pre-polarization condenser microphone. Sensitivity:
30mV/Pa. See the Appendix A.
ST-11/11D can also be equipped with other types of microphones to measure noise
which is very low or very high.
(2) Dynamic range
(3) Frequency Range：10Hz∼16kHz, while using the AWA14423 or AWA14431 Micro-
phone, the Frequency Weighting can get to10Hz∼20kHz
(4) Frequency Weighting: A, C, Z and B. For the response in free field, see appendix B.
(5) Time Weighting: F, S, I, Peak
(6) Detectors Characteristics: the true effective value, digital detection, peak factor≧
10.
(7) Accuracy: IEC 61672：2013 Class 1
(8) Range control: high and low two gears, each gear with 20 dB attenuation, 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~9V, 0.2A, working current <120mA
Type
AWA14425
AWA14423
AWA14411
AWA14431
Type
AWA14425
AWA14423
AWA14411
AWA14431
A- Weighting
Self-generated
Noise
<20dB(A)
<18dB(A)
<10dB(A)
<40dB(A)
A- Weighting
Self-generated
Noise
<25dB(C)
<23dB(C)
<15dB(C)
<45dB(C)
Z- Weightin
g
<30dB
<28dB
<20dB
<50dB
Meas.
Upper
Range
140dB
138dB
132dB
160dB
External
diameter
（mm）
Φ12.7
Φ12.7
Φ23.77
Φ6.35
Sensitivity
mV/Pa)
30
40
80
4
Frequency
Range (Hz)
10∼16000
10∼20000
10∼16000
10∼20000
Types of microphones
2
Note 1: test conditions based on normal temperature and pressure, and only turn on the
basic functions.
Note 2: when the logging and recording function is open, the consumption of power will
add 40mA.
(13) Dim. (H×W×D) mm: 310 mm×72 mm×32 mm
(14) Weight (kg): 0.4
(15) Operation environment:
Air temperature: -15°C~+50 °C
Relative humidity: 10 %~90 %
Air pressure: 65 kPa~108 kPa
(16) Measurement range:
Above range is the value in the factory, it may change when users tune the calibration
value or replace the microphone. The lower limit is determined by the background noise
plus 8dB.
(17) 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 supply through USB socket. Use high-capacity lithium battery with 2300mAh
Microphone
Type
AWA14425
AWA14423
AWA14411
AWA14431
Measureme nt
range
（dB）
45∼140
27∼120
43∼138
25∼80
35∼132
15∼112
65∼160
45∼140
Peak
factor
Ref.10
dB
45∼123
27∼103
43∼121
25∼101
35∼115
15∼95
65∼143
45∼123
measurement
range（dB）
70∼143
50∼123
70∼141
50∼121
60∼135
40∼115
90∼163
70∼143
3
Structure features and function
The outline of the Sound Level Meter is shown in figure 1. It consists of microphone,
preamplifier and the main unit. During normal operation, the measuring microphone
and the preamplifier are installed on the head of the main unit, connected with the
main unit through knurled nut. Extension cable can also be used between the main unit
and the preamplifier. The function of the connector’s pin between preamplifier and the
sound level meter is shown in Figure 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
battery cover plate. All switches are button switches and located at the central of the
obverse side. Measuring results are shown on the 128×64 OLED display. Overload
indicator light is located on the front top along with external power supply socket
and USB port see Figure 3.
Fig 1 Fig 2
4
Fig 3
Fig.4 x9 socket
Table 1 Keys function
Table 1 Keys function
Power
on/reset
Enter
Exit
Right
cursor
Left
cursor
Parameter
up
Paramet
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
AC/DC output socket, the socket is stereo output socket, when matches with the plug,
the definition of each pin plug shown as below:
RS232 output socket, the socket type uses the RJ45 socket, pins are defined as below:
RS232 port serial input, 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
Reset
7
Power control
8
GND
AC
DC GND
6
Operation before measurement
Table 2 Definition of symbol
4.1 Check list
①Check whether the microphone has been installed correctly.
②Check whether battery has been put in.
③If necessary, calibrate it with a sound calibrator.
④The meter should be tested by relative department regularly (such as one year) to
ensure its accuracy.
4.2 Use of windscreen
If windy, you may use a windscreen to reduce influence of wind noise. There are differ-
ent types of windscreens to choose. A φ35×60 size windscreen can reduce noise about
10dB-15dB, See Appendix D, the influence of free-field responses for a meter with a
windscreen when there is no wind.
4.3 External 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, it is recommended to use an external power
supply.
Symbol Definition
Battery level display
Microphone setup: diffusion field type
Integrating measurement and statistical
analysis are in progress
Integrating measurement and statistical
analysis are paused
logging the varying waves of SPL with time
Recording
The measured signal surpasses the upper limit
of measurement range
The measured signal under the lower limit of
measurement range
7
Table of contents
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