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ST-25D

User Guide

Sound Level Meter

ST-25D

Summary of Contents for ST-25D

Page 1: ...ST 25D User Guide Sound Level Meter ST 25D ...

Page 2: ...nd hitting no water or oil entering If choose to use alkaline batteries please use high capacity of alkaline batteries And remember to remove the batteries when don t use sound level meter for more than one week Do calibration before and after measurement if needed Keep sound level meter powering on status at least 8 hours every month for charging internal clock battery ...

Page 3: ...alibration record 6 Operation 6 1 Main menu 6 2 Measurement interface 7 Setup 7 1 RTC 7 2 Analyzer setup interface 7 3 Basic setup interface 8 Data Recall 8 1 Once measurement result 8 2 24H automatic monitoring result recallrecall 8 3 Integral measurement result recall 8 4 Delete data 8 5 Change to U disk mode and recall 8 6 File Format Description 9 GPS Positioning Measurement 9 1 Distance measu...

Page 4: ...tics and integral analysis functions The design of low power dissipation and the automatic switchover of battery and the external power can support the instrument to work for a long time With embedded 32 MB flash memory turns ST 25D a reliable data logger It also has a pre installed 32GB SD card for WAV recording function The instrument can be applied in environment protection labor health industr...

Page 5: ...m 1 to 99 Note2 24H Measurement indexes Ld Ln Ldn besides the indexes above 32MB Flash memory 48kHz 32bit 8kHz 8bit Location Transport speed Build in Support print measurement data 4 x AA Batteries or USB 5V external power supply AC DC RS 232 USB Key Limit Clock Interval 260 x 80 x 30 mm 2 6 inch color display with 240 320 resolution Statistic distribution graph Accumulative distribution graph 0 3...

Page 6: ...educe 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 annexes 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 buttons are located at the central...

Page 7: ...n GPS antenna port Windscreen anti drop hook Preamplifier Knurled nut Display Security slot SD card indicator SD card slot pre installed a 32GB SD card Keypad Mini USB port Battery indicator Status indicator AC output GPS indicator RS 232 ST 25D ...

Page 8: ... s amplitude won t exceed 1V Its relationship with input signal is shown in the table below 5 Pin 1 2 3 4 5 6 Definition Power supply Not connected Signal input Not connected Signal ground Not connected AC output 1 2 AC input signal minus 10dB input signal plus 10dB AC 0 44V 1kHz sine wave 0 7V 1kHz sine wave 1 5V 2 UD 3 UD 4 NC 5 GND ...

Page 9: ...d Not connected Working status indicator Working status indicator LED behavior Flashes Static On Off Status Measurement starts Measurement paused Measurement Stopped GPS status indicator LED behavior Flashes in every 1 second Off Status Positioning information is available GPS module is not installed or in sleep mode GPS status indicator ...

Page 10: ...ge down Change option Enter the settings interface Enter the current operation Delete the current data or cancel the current operation Power off the instrument Finish the measurement ahead of time and save the measurement data Turn on off the backlight Start or pause the measurement Return to previous menu from the current menu Load the default parameters in the main menu interface Enter Cancel De...

Page 11: ...nterface can choose the measuring time by grade Mini printer is optional Meaning Analysis mode Analysis mode GPS positioning measurement The number of working analyzers Statistics Integral are measuring Overload The upper line shows hour minute and second the bottom line shows year month and day Status of power supply means the instrument is powered by external power supply Status of power supply ...

Page 12: ...sponses for a meter with a windscreen when there are no wind 4 3 External power supply The Sound Level Meter can be connected with external power through the USB 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 3 V 6 5 V The shell of plug is the cathode and the core of plug is the anode When...

Page 13: ...microphone which is 7dB more than self generated noise Free field is set according to the microphone that the instrument is equipped The amendment value of free field is 0 2dB which also can be changed by the user Mic Sensiti is the sensitivity level of the microphone after last calibration This sensitivity level includes the preamplifier s attenuation Calibrator SPL is the actual level after cali...

Page 14: ...he adjustment continues till the key is released The above steps can be performed only when the displayed sound pressure level differs from the used sound pressure level 11 In the current mode the cursor can only be moved on dBA at the right side of Current SPL and Calib If the user wants to modify the parameters they should press Key shown below The status changing from Ready to Modify allows the...

Page 15: ...hone sensitivity level will be saved If the newly calibrated sensitivity level differs from the last saved sensitivity level by over 4dB the meter will prompt As the sensitivity level difference exceeds 4dB it can t be saved Please check whether the calibration is correct The user should check whether the microphone is damaged If the user doesn t press key the meter will still use the original mic...

Page 16: ... the other serial number The message includes calibration date environment condition type and serial number of microphone correction value in free field sensitivity level of micro phone measurement range and so on 5 4 Calibration record When the cursor is moved to the Calibrate and press the or key to enter the Calibration record interface shown below ...

Page 17: ...red to the default values The and keys allow the user to move the cursor leftwards rightwards When pressing key the user can go to the corresponding submenu There are two submenus in setup interface analyzer setup and basic setup 6 1 Main menu When the user presses key for above 2s and then releases it the meter goes to the main menu 6 2 Measurement interface When the cursor is on the Measure if t...

Page 18: ... the user can use or key to change the menu options Power indication displays socket icon which means the instrument is powered by external power supply and battery icon means the instrument is powered by batteries The power voltage symbol can accommodate up to 16 lines When these 16 lines are filled the power voltage is about 5 6V When the power voltage is lower than 3 6V the indication is change...

Page 19: ...ement interface which means the current weighting is Z frequency weight ing and F time weighting Sta 1 and Sta 2 open at the same time in the measurement interface which can be displayed switchover and the operation won t affect the measurement result The black background frame in the middle shows six measurement indexes of the current frequency weighting and time weighting in the List1 Linst Leq ...

Page 20: ...ive distribution graph In the middle is Acc Figure The y ordinate of the graph is percentage and the x ordinate is the sound pressure level which has 140 points every point represents 1dB When the cursor is moved to 94dB the user can view the accumulative percentage that every sound pressure level takes up by pressing the or key We can figure out any statistical sound pressure level with this meth...

Page 21: ...ement automatically starts every one hour at integral o clock totally 24 times The measurement duration of every one hour can be set by the user It must be bigger than 1min and less than 59min If it is not within this range the meter will automatically adjust it to 1min 1h During 24H measurement Ld Ln and Ldn are calculated synchronously 24H measurement mode consists of List All and Fig display in...

Page 22: ...und is the current measurement indexes the corresponding 24 lines below are the measurement data 1 is the first page of measurement indexes when the cursor is moved there this can be changed to 2 by pressing or keys and the measurement indexes are changed to Time Leq T Lmin L5 L50 L95 SD The part of in the middle means the measurement has not reached the period 6 2 1 2 2 ALL measurement interface ...

Page 23: ...trument the noise changing curve of the last 10s will be displayed Pressing the cursor key and key can choose to delete the data in the last 5s or 10s and then press the key the measurement will go on 20 The Fig display interface can display 24h sound pressure level chart The y coordinate is sound pressure level and the x coordinate is hour totally 24 columns Leq T means that the currently display...

Page 24: ...ops automatically till the measurements in 24 time periods are completed In the 24h automatic monitoring process the user can t pause the operation For the first period the user can start the measurement with the key However for the other periods the meter automatically starts the measurement when it reaches the same integral time point If the user hopes the instrument will continue the next 24H m...

Page 25: ...Imax LCFmin LCSmin LCImin LCeq T LCpeak LCE LZFp LZSp LZIp LZFmax LZSmax LZImax LZFmin LZSmin LZImin LZeq T LZpeak LZE 6 2 3 1 Sim interface From the third to the eighth line are measurement content which is concerned about frequency weighting in the current measurement interface and the details are shown below 6 2 3 2 List interface Move the cursor to the Sim press the or key to enter the List in...

Page 26: ...ound are measurement content and there are three measurement indexes LAFp LCFp and LZFp Pressing or key when the cursor is at the three indexes The measurement result is refreshed every 0 5 second and changing with the environmental noise The graph displayed on the lower display screen is the progress graph that instanta neous value used in statistic analysis changing with time Each graph is displ...

Page 27: ...surement process if the user wants to pause the measurement the user can press the key again The meter s status display line prompts Pause And the meter pauses the statistic analysis and integral measurement the statistic sound level and equivalent sound level stop refreshing but the instantaneous value still changes with the measured noise 6 2 3 5 Integral measurement The big characters and dial ...

Page 28: ...sor can stay at the year month day hour minute and second option the user can setup the calendar clock by pressing or key The bottom line is the message of power supply Vusb is the voltage of external power supply Vcc is the voltage of battery the instrument will be powered by external power supply when the battery is not connected Vbat is the voltage of backup battery the instrument will be power...

Page 29: ...nt is turned on When the voltage of backup battery is less than 2V the RTC will be disabled and needs setup again 8 hours of continuous working every month is recommended At the left upper side of double line frame is analysis mode Open at the right upper side is the switch of the corresponding analysis module when the cursor is moved there the user can choose open or close by pressing or key When...

Page 30: ...ed to Run mode the user can enter setup interface of time run mode by pressing or key b Clock When the mode of Clock is chosen shown below At the left is calendar and the right is clock the user can set a time here When the calendar clock arrives the time the instrument will be started The cursor can moved to year month day hour minute and second which are adjustable by pressing or key When one of...

Page 31: ...1 The instrument will save the measurement data automatically after the measurement is finished during this period the instrument won t response to the order of measurement startup so the Ts should better shorter than ΔT Note2 When the setting measurement time Ts is longer than interval the measure ment time will be Ts and the interval will be prolonged 7 2 3 Analyzer setup Analyzer setup includes...

Page 32: ...29 Analysis mode Total value Time weighting F S and I can be chosen Frequency weighting A C and Z can be chosen b Integral analyzer Only Ts and Run mode are adjustable ...

Page 33: ...asic Setup1 inter face and press key to switch Basic Setup2 interface has four options Auto Power Other setup and Authorize Basic Setup3 interface has three options Bluetooth RS232 setup and Default There are five analyzer setup options from up to down respectively Multi analyzer Name Setup Hardware Setup Auto power and Other Setup The boundary between each other is yellow double lines ...

Page 34: ...easurement time before and after measurement And Key N A means we can t change the measurement time by pressing the key 7 3 2 Name Setup Name 01 DATA_0001 is the name used for saving the current measurement result 01 means the first group and the name doesn t affect the measurement result When the cursor is moved to Group name the user can choose the other names between 01 and 64 by pressing or ke...

Page 35: ...eld 90 The user can use the function to change the free field microphone to pressure field microphone The influence that the three options of response frequency is seen in Annex GPS GPS power has three options Open Save Close If Open GPS module s power supply keeps running all the time the power consumption is high but the positioning is fast If Save GPS module s power supply is turned on when nec...

Page 36: ... result automatically after the end of the measurement In this case the printer shall be connected and its power supply shall be turned on Mode Simple No Pic Picture and Screen can be chosen If No Pic is chosen the measurement result is printed only with text If Picture is chosen the measure ment result is printed with statistic chart accumulative chart spectrogram etc If Screen is chosen the prin...

Page 37: ...kHz dB at the right side is the weighting value which means the D value of weighting and non weighting at the frequency The negative value of weighting means attenuation and the positive means amplification the attenuation at every frequency can be setup by pressing or key Weighting T the frequency weighting that defined by the user When the cursor is on 5 at the left side the cursor can choose wi...

Page 38: ...ss or key to change it to open Trigger logging Ts means the instrument will record the noise along with the measurement 72dB T 80s means when the SPL exceeds 72dB the instrument will record the noise for 80s When the status bar at the right corner shows R 13 the remaining time for voice note is 13s Note the WAV file for voice note has precision of 8k Hz sampling so it s only recom mended for subje...

Page 39: ...atus Baud rata 9600 115200 and 1 382M PIN Code the code when communicate to other device with default value of 0000 New baud 9600 115200 and 1 382M Note 115200 is recommended 7 3 7 Bluetooth Optional Power Master Slave and off Press key to open the slave mode and press key to open the master mode The master mode can also be connected to the Bluetooth printer to print the measurement result When th...

Page 40: ... default user settings Move the cursor to the option and press key to save the settings Then the instrument will show OK which means the setting is successful 2 Save user freq weight the user defined frequency weight 3 Factory default Move the cursor to Factory default and press key the settings will recover to the default value when it left the factory When the cursor is at 3 and press the or key...

Page 41: ...ing to data recall interface also can through change SD card to U disk mode to viewing on computer When user enter the Recall submenu from main menu each page displays 15 groups of data press or button to move the cursor and press or button to view the measuring name data time and analyzer then press to view the detail of measuring result The definition of measuring method Stat One Once mode of St...

Page 42: ... line and press or key to enter the Fig interface of Sta 2 shown below Left Move the cursor to Statistics distribution graph at the third line and press or key to enter the accumulative distribution graph shown below Right 8 1 Once measurement result recall When the recalled data is the result measured in the one measurement method the method displays STA One Press key to go into the list interfac...

Page 43: ...accumulative percentage of different sound pressure level If the extra Ln is open in the analyzer setup interface of STA the measurement data will add L1 L99 and 5 user defined Ln shown below 8 2 24H automatic monitoring result recall When the measurement result is monitored automatically in 24 hours the method displays 24H Press key to display the following screen ...

Page 44: ... or key to view Ln and Ldn and press key to return to the List display location In the List display interface press key to go to the statistic graph and accumulative graph display interface For the operation see the graphic view part in 8 1 Once measurement result recall If the extra Ln is open in the analyzer setup interface of STA the measurement data will add L1 L99 and 5 user defined Ln shown ...

Page 45: ... 8 3 Integral measurement result recall When the recalled data is the result measured in the integral measurement method the method displays OVERALL INT Press key to go into the list interface shown below ...

Page 46: ...ess key there will a notice on the screen Clear all data shown below Press key to delete all data and press the other keys to return the recall interface Press key to delete this file and press the other keys to return the recall interface 8 4 2 Delete single group of data In the data recall interface whatever number is the cursor at as long as you press the key there will a notice on the screen d...

Page 47: ...de and recall If you want to download data to your computer firstly connect the sound level meter to a computer via an USB cable then go to Recall interface the instrument screen prompts a dialog change to U disk please press key then the sound level meter will change to U disk mode and with a message U disk mode press exit button will return Now it will pop U disk on your computer you can downloa...

Page 48: ...ontent of the file and the last four characters represent the sequential number of measurement events Each time the statistical analysis generates two files STA AWA and NUM AWA If the sequential number of the last four characters is the same the measurement results are generated from the same measurement event File name STAXXXX AWA NUM_XXXX AWA L_TXXXX AWA 24H_XXXX AWA XXXXYYYY WAV ALL_XXXX AWA St...

Page 49: ...th UTC 8 means GMT means local time is 8 hours earlier than GMT GPS RTC at the third line is the current time of GPS Below the table are the latitude longitude and altitude of the measurement starting point and finishing point The unit of latitude and longitude is degree and the unit of altitude is meter m The last English character of latitude and longitude means N is North altitude S is South al...

Page 50: ...ress key to show the position message of finishing point and the displacement and velocity of the starting point Press key again the position of this moment of pressing the key will be taken as the start point and the finishing point shows the message of current position 9 2 Calibrate the RTC In the interface of GPS the GPS RTC shows the RTC and press key to finish the calibration ...

Page 51: ...ing point will be shown in the interface The message of GPS refreshes every second In the process of measuring noise the measurement interface can switch to GPS interface and it won t affect the result of statistics and integral measurement The positioning message of last second will be saved along with the measurement result of statistics and integral the last four line shows the message of posit...

Page 52: ... Center on the official website or go to the follow ing url to download the latest version of ScarletSound https scarlet tech com wp content uploads ScarletSound ScarletSound zip 2 Extract and run the program ScarletSound exe If running Windows Vista or later you will need to Right Click on the ScarletSoundSetup exe file and choose to Run As Administrator 3 Select destination folder to install Sca...

Page 53: ... the interface of the software Select the transmission method and click the OK to save the settings When the COM is selected the default baud rate is 115200 The working modes of RS 232 are listed below Note The SLM side is connected to the sound level meter and the PC side is connected to the computer 50 Switch 1 OFF ON ON OFF 2 OFF OFF ON ON Note Data transmission The Dfuse software should be ins...

Page 54: ...as the format of xls by ScarletSound by clicking Export Read data from files Click Import to restore data files previously stored in the installation directory DataRecord Clear data displayed at the software When the data in the instrument is deleted the displayed data in the software won t disappear by clicking Clear or restart the software to clear the displayed data 51 ...

Page 55: ...trument and the data will be shown in the interface of the software Basic Information When the device is connected to PC by RS 232 cable click Basic Info to go to Informa tion page Serial number of the instrument and microphone will show up Save the calibration record to PC Click Export to save the calibration record to PC by text filetype 52 ...

Page 56: ...peak LA0 5 LAIp LASp LAFp LC0 5 LCIp LCSp LCFp LZ0 5 Note The USB port communication method don t support for reading the basic infor mation Note 1 when the upper limit of y axis is less than the max of the displayed parameters click the Y axis to adjust the range of the Y axis 2 Don t swith the 0 5s and real time directly click the Stop firstly 3 Double click the center frequency in the graph the...

Page 57: ... the overload condition exists or 1s In the statistical analysis process if overload appears the overload indication will latch until the measurement results are reset or next time measurement are started The overload indication judges the peak value of signal When the signal s peak value factor is high the sound pressure level displayed on the meter is lower than measurement upper limit but overl...

Page 58: ...0 1 0 8 0 8 1 7 0 6 1 6 3 1 2 9 2 7 3 6 3 1 2 3 3 2 75 0 1 0 2 0 2 0 2 0 2 0 4 0 9 1 8 0 5 0 9 4 1 3 0 4 0 3 6 3 4 3 3 5 1 90 0 3 0 1 0 1 0 3 0 1 0 5 1 2 2 1 1 1 2 4 2 8 4 8 3 7 4 9 4 3 5 1 8 4 105 0 7 0 6 0 1 0 0 0 2 0 2 1 1 1 9 1 2 1 9 5 0 4 0 4 0 7 2 7 2 8 8 9 6 120 0 7 0 9 0 4 0 4 0 1 0 1 1 0 2 2 1 1 1 6 4 2 5 4 5 3 5 2 8 9 10 0 11 1 135 0 5 0 8 0 4 0 8 0 2 0 2 0 6 2 0 1 7 0 8 2 8 3 0 6 2 7 3 ...

Page 59: ...56 Z weighting response when directivity is 90 degree Z weighting response when microphone type is random ...

Page 60: ...ity is lower than the tracking sensitivity so the user can firstly move the receiving antenna to signal stronger place such as outside the window when using it indoor or in the weak signal environment After the receiver catches 4 satel lites signal and positioning can be made correctly move the antenna to the place to be positioned GPS positioning measurement of ST 25D mainly measures longitude la...

Page 61: ...3 octave band pass filter at 12 5kHz center frequency Z weighting response when microphone type is random G G 3 8 G G 1 8 G0 G 1 8 G 1 4 G 3 8 G 1 2 G G 3 8 G 1 4 G 1 8 G0 G 1 8 G G 3 8 G Annex 3 Filter attenuation characteristics ...

Page 62: ...utside 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 Operate...

Page 63: ...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 220309 ...

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