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SVAN 973 User Manual

– Appendixes

179

Frequency

SA 22 Free Field

response

Compensation

filter

SA 22 Compensated

Effect

Uncertainty

(IEC 62585:2012)

[Hz]

[dB]

[dB]

[dB]

[dB]

501

0.00

-0.05

-0.05

0.20

516

0.01

-0.05

-0.04

0.20

531

0.01

-0.06

-0.05

0.20

546

0.02

-0.06

-0.04

0.20

562

0.03

-0.06

-0.03

0.20

579

0.03

-0.07

-0.04

0.20

596

0.04

-0.07

-0.03

0.20

613

0.05

-0.07

-0.02

0.20

631

0.05

-0.08

-0.03

0.20

649

0.06

-0.08

-0.02

0.20

668

0.07

-0.09

-0.02

0.20

688

0.08

-0.09

-0.01

0.20

708

0.08

-0.10

-0.02

0.20

729

0.09

-0.10

-0.01

0.20

750

0.10

-0.11

-0.01

0.20

772

0.11

-0.11

0.00

0.20

794

0.12

-0.12

0.00

0.20

818

0.12

-0.13

-0.01

0.20

841

0.13

-0.13

0.00

0.20

866

0.14

-0.14

0.00

0.20

891

0.15

-0.15

0.00

0.20

917

0.16

-0.15

0.01

0.20

944

0.17

-0.16

0.01

0.20

972

0.18

-0.17

0.01

0.20

1000

0.19

-0.18

0.01

0.20

1029

0.21

-0.19

0.02

0.20

1059

0.22

-0.20

0.02

0.20

1090

0.23

-0.21

0.02

0.20

1122

0.25

-0.22

0.03

0.20

1155

0.26

-0.23

0.03

0.20

1189

0.28

-0.24

0.04

0.20

1223

0.29

-0.25

0.04

0.20

1259

0.30

-0.26

0.04

0.20

1296

0.31

-0.27

0.04

0.20

1334

0.33

-0.28

0.05

0.20

1372

0.34

-0.29

0.05

0.20

1413

0.35

-0.3

0.05

0.20

1454

0.36

-0.31

0.05

0.20

1496

0.37

-0.32

0.05

0.20

1540

0.38

-0.33

0.05

0.20

1585

0.39

-0.35

0.04

0.20

1631

0.40

-0.36

0.04

0.20

1679

0.41

-0.37

0.04

0.20

1728

0.42

-0.38

0.04

0.20

1778

0.43

-0.39

0.05

0.20

1830

0.44

-0.4

0.05

0.20

1884

0.45

-0.40

0.05

0.20

1939

0.46

-0.41

0.05

0.20

1995

0.47

-0.42

0.06

0.20

2054

0.48

-0.42

0.06

0.20

2113

0.50

-0.43

0.07

0.20

2175

0.50

-0.43

0.07

0.20

2239

0.50

-0.43

0.07

0.20

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Содержание SV 973

Страница 1: ...USER MANUAL SV 973 CLASS 2 SOUND LEVEL METER SOUND EXPOSURE METER Warsaw 2020 12 18 Rev 1 01 Copyright 2020 SVANTEK All rights reserved...

Страница 2: ...or registered marks in this manual belong to their respective manufacturers Microsoft and Windows are registered trademarks of Microsoft Corporation The Bluetooth word mark and logos are registered tr...

Страница 3: ...10 ACTIVATING OPTIONAL FUNCTIONS 25 3 MEASUREMENT FUNCTIONS AND CALIBRATION FUNCTION 26 3 1 ACTIVATING MEASUREMENT FUNCTIONS MEASUREMENT FUNCTION 26 3 2 INSTRUMENT S CALIBRATION CALIBRATION 26 3 2 1...

Страница 4: ...S FOR PRESENTATION MEASUREMENT RESULTS 49 5 4 CHOOSING LOGGER RESULTS FOR PRESENTATION LOGGER RESULTS 49 5 5 CONFIGURING POWER SAVER SCREEN SETUP 49 6 MANAGING FILES FILE 51 6 1 MANAGING INSTRUMENT S...

Страница 5: ...General Settings 65 10 2 2 Logging 1 1 or 1 3 octave spectra Logging 66 10 2 3 Setting parameters of 1 1 or 1 3 octave analysis Spectrum 66 10 3 CONFIGURING 1 1 OR 1 3 OCTAVE SPECTRA VIEWS 66 10 3 1...

Страница 6: ...N 3 READ OUT OF MEASUREMENT RESULTS IN 1 1 OCTAVE AND 1 3 OCTAVE MODE 109 A 5 FUNCTION 4 READ OUT OF THE DATA FILE FROM THE INTERNAL FLASH DISK OR RAM MEMORY 109 A 6 FUNCTION D READ WRITE THE DATA FIL...

Страница 7: ...ER 181 C 5 FREQUENCY CHARACTERISTICS OF THE IMPLEMENTED DIGITAL FILTERS 190 C 6 MISCELLANEOUS SPECIFICATION OF SV 973 193 C 7 DECLARATION OF CONFORMITY 198 APPENDIX D DEFINITIONS AND FORMULAE OF MEASU...

Страница 8: ...cay 72 Decay method 74 Default settings 21 Deleting files 53 Detector 35 66 70 Diffuse Field 42 Directory 52 Display colour 50 Display mode 17 45 66 Display scale 48 68 Display settings 45 Dosimeter 2...

Страница 9: ...ment settings 31 Measurement trigger 33 Measurement view 17 Memory 23 Menu position 18 Microphone 76 Microphone compensation 42 Min spectrum 68 N New directory 52 Noise margin 73 O One result view 45...

Страница 10: ...n 32 Start Stop interface 54 Statistical levels 43 Statistics view 47 Summary results 35 37 66 T Text editor 19 Threshold level 70 Timer 43 Total value 65 Trigger level 39 Trigger source 34 39 Trigger...

Страница 11: ...ument can be easily calibrated in the field using an acoustic calibrator Thanks to a robust pocket size housing and Low Energy Long Range Bluetooth 1 Smart wireless interface this instrument is an exc...

Страница 12: ...eparate calibrations while using SV973 as SLM and as Dosimeter 1 2 GENERAL FEATURES OF SV 973 Sound Level Meter in extremely small pocket size body Noise measurements meeting Class 2 IEC 61672 1 2013...

Страница 13: ...FIRMWARE OPTIONS AVAILABLE SF 973_PACK Level Meter including 1 1 1 3 octave analysis audio recording SF 973_1 1 1 octave analysis option SF 973_2 1 3 octave analysis option SF 973_5 Reverberation time...

Страница 14: ...sary to set the appropriate compensation in the Compensation Filter screen see Chapter 4 7 2 1 INPUT AND OUTPUT SOCKETS OF THE INSTRUMENT Top cover of the instrument The measurement Input is placed in...

Страница 15: ...USB power source via the SC 158 cable When the USB is connected the instrument automatically switches powering from the internal batteries to the USB powering After disconnection the USB the instrumen...

Страница 16: ...ESC This key closes lists of parameters or other screens and return to the upper list of the menu It acts in an opposite way to the Enter key When a screen is closed after pressing the ESC key any cha...

Страница 17: ...isplay 96 x 96 pixels which displays the measurement results and the configuration menu The instrument has two general modes of operation measurement performance results preview mode and configuration...

Страница 18: ...parameters hidden in the Simple interface mode the instrument will use settings previously defined in the Advanced mode or default settings When the Simple interface mode is being selected after the...

Страница 19: ...omatically until you release the pressed button You may change the numerical parameter value with a larger step usually 10 with the key pressed with Shift Matrix of parameters When the list of paramet...

Страница 20: ...come inactive the selected line field will be in the frame with black background not yellow For example if Logger path Menu Measurement Logging Logger Set is switched off some other Logging positions...

Страница 21: ...Leq with 1 second step for all profiles and summary results saving Other functions are switched off like measurement trigger logger trigger event recording and timer The logger and summary results wi...

Страница 22: ...icon is displayed when the instrument is powered from the internal batteries Icon colour corresponds to the charging status of the batteries green 30 100 yellow 10 30 red less than 10 clock icon is di...

Страница 23: ...nge detector The underrange indication appears when the RMS value for the elapsed time is below the lower linear operating range This condition is checked once per second An underrange is indicating b...

Страница 24: ...d automatically using a pattern LLdd where LL is the string of letters so called prefix and dd is a string of digits that forms a number Up to 8 characters can be used to name a file The default prefi...

Страница 25: ...nal standards and methods For more complex tasks you may expand the instrument with additional functions These features include 1 1 and 1 3 octave analyser wave recording and reverberation time measur...

Страница 26: ...l functions that broaden the applications of the instrument can be easily installed These optional functions can be provided initially by the manufacturer or can be purchased later when required Note...

Страница 27: ...tor with the use of special command see Appendix A 3 2 1 Calibration By Measurement To calibrate the instrument 1 Set the calibration level Cal Level see Appendix C Chapter C 1 par Calibration 2 Caref...

Страница 28: ...ment channel the microphone the preamplifier or the instrument itself are damaged Note During the calibration measurement external disturbances acoustic noise or vibrations should not exceed a value o...

Страница 29: ...n Clear Hist and press Enter The instrument requests confirmation of the selected operation ENT 3 2 4 Post measurement calibration Post Calibration Some regulations require to add information about ca...

Страница 30: ...ibrator to the microphone and switch it on if the used calibrator doesn t have automatic switch on feature The calibration starts automatically and the calibration process is similar as in case of cal...

Страница 31: ...ogramme the alarm function This position appears only in the Dosimeter function and Advanced interface mode Logging allowing you to configure the logging function Spectrum allowing you to set spectrum...

Страница 32: ...logger file as Summary Results see description of the Logger Setup The integration period can be infinite Inf or selected from the set 24h 8h 1h 15m 5m 1m from 1s to 59s with 1s step from 1m to 59m wi...

Страница 33: ...other standard for time averaged Leq measurements When this option is selected values of the Leq Lden LEPd Ln and Sel results depend on the detector time constant Results are displayed with the indica...

Страница 34: ...cases the instrument continues checking the trigger condition every 0 5 mc This is a mirrored trigger to the Level trigger Note When a measurement is waiting for the level trigger the flashing level i...

Страница 35: ...me constants are applied always to the Lmax Lmin L SPL Ltm3 and Ltm5 results and to the Leq LE SEL LEPd and Lden results in case the Exponential LEQ detector is selected in the General Settings screen...

Страница 36: ...ile and recording of audio signal in a wave file In the Simple instrument interface mode the Logging list includes only of one position Logger Set ENT 4 5 1 Setting general logging parameters Logger S...

Страница 37: ...Logger Step defines a step for logger results measuring and logging in a file It can be set from 100ms to 1h Its value by default is set to 1s Note In the Simple interface mode the Logger Step parame...

Страница 38: ...or enabled by selecting its type Level or Level in the Trigger position ENT When the trigger is enabled other parameters appear in the list a measured result that is checked for a trigger condition S...

Страница 39: ...the event that caused logger trigger Secondly when it is necessary to have continuous logging but the source is oscillating near the threshold level The extension of the registration window allows to...

Страница 40: ...hat after first recording trigger conditions continue to be checked new wave recording may start during the same measurement time The attached example shows that between measurement start and stop two...

Страница 41: ...ig manual trigger is selected the signal recording starts and ends after pressing simultaneously the and keys during the measurement After pressing these keys the screen with the corresponding message...

Страница 42: ...asurement range The absolute range values depend on the calibration factor and are shown in the Range screen The attached screens assume the calibration factor equal to zero ENT The instrument uses tw...

Страница 43: ...ve following settings 1 10 20 30 40 50 60 70 80 and 90 All values should be within the integer range 1 99 Each value can be set independently from others ENT 4 9 PROGRAMMING INSTRUMENT S INTERNAL TIME...

Страница 44: ...gure the Timer function as on the attached screen and to set the measurement parameters path Menu Measurement General Settings and the file name path Menu Measurement Logging Logger Setup The instrume...

Страница 45: ...allowing you to select time history results to be viewed as a plot Screen Set allowing you to switch rotation of the screen on off and set the energy saver function 5 1 ENABLING VIEWS DISPLAY MODES T...

Страница 46: ...or 7 Units of measured value 8 Elapsed time Elapsed time shows the current second of the measurement The value presented there belongs to the range 0 Integration Period Note For some results weighting...

Страница 47: ...played as a plot You may change viewed results by pressing the Enter key The cursor position can be changed with the key ENT Logger view fields 1 Logger Plot 2 Result value for cursor position 3 Resul...

Страница 48: ...d in the instrument s memory The purpose of this view is to give the user a first indication about the signal to be measured 5 1 6 File information view The File Info position enables additional view...

Страница 49: ...LEPd Ltm3 Ltm5 Ln EX SD and OVL Dosim Res list TIME Lpeak Lmax Lmin L DOSE D_8h PrDOSE LAV Leq LE SEL8 E E_8h LEPd PSEL Ltm3 Ltm5 Ln PTC PTP ULT TWA PrTWA Lc a EX SD and OVL Note The EX and SD result...

Страница 50: ...switched off After it has happened pressing any key will cause the display to switch on again If Dim Mode is Off the screen will stay bright all the time By default Dim Mode is of Level 2 medium dim T...

Страница 51: ...n the File Name position of the Wave Recording screen path Menu Measurement Logging Wave Rec Elements of the file structure depend on the selected function Lev Met 1 1 Oct 1 3 Oct RT60 Dosimeter and m...

Страница 52: ...of logger and wave files To do this choose the required directory and press the Enter key Select the Work Dir position in the command list and press Enter Starting from this moment all logger and wave...

Страница 53: ...t cannot be undone After disk erasing the default directories will be recreated ENT ENT 6 2 MANAGING SETUP FILES SETUP MANAGER The Setup Manag enables saving new setup files deleting loading them as c...

Страница 54: ...es 7 1 CHOOSING USER INTERFACE MODE USER INTERFACE There are three modes of the user interface Start Stop Simple or Advanced These modes can be selected in the User Inter screen The Simple mode enable...

Страница 55: ...nd key must be pressed at the same time with Shift When the 2nd Fun option is selected the Shift key operates as in the smartphone virtual keyboard the Shift key should be pressed first and the second...

Страница 56: ...Rate speed can be selected from the following available values 1200 2400 4800 9600 19200 38400 57600 or 115200 bits s Other RS 232 transmission parameters are fixed to 8 bits for data No parity 1 Sto...

Страница 57: ...trument it s serial number the current software version installed and the appropriate standards which the instrument fulfils ENT Note The contents of the Unit Label should be always sent to the Svante...

Страница 58: ...Advanced interface mode Warnings allowing you to enable disable warnings to be displayed during the normal operation of the instrument 8 1 SELECTING USER INTERFACE LANGUAGE LANGUAGE The Language posit...

Страница 59: ...the top line of the screen In this case you can comment the measurement Press Enter to finish recording The recording end will be confirmed with the message Saved O K ENT The file with voice comment...

Страница 60: ...hen the measurement is completed the warning Power Off becomes active Then if you would like to turn off the instrument you should confirm this If Microph is active there will be warning if the instru...

Страница 61: ...ssion speed Baud Rate and set the time limit during which the data transmission should be performed Time Out ENT The RS 232 interface transmission speed Baud Rate can be selected from the following av...

Страница 62: ...er pressing a key it returns to the Report list Below is an example printout of the report SVANTEK C SV 973 S N 39039 2017 05 22 13 59 24 T 00 00 05 Profile 1 Slow A LCpeak 82 9 Ld 55 9 LASmax 77 0 LE...

Страница 63: ...stics list of the Report menu You may exclude all Leq Lmax Lmin and Lpeak spectra positions Leq Spect Lmax Spect Lmin Spect Lpeak Spect from the report Off include all bands of 1 1 or 1 3 spectra Prin...

Страница 64: ...HE REPORT SPECTRUM The Spectrum position allows you to select essential bands of the Leq Lmax Lmin and Lpeak spectra for the report ENT 9 6 PRINTER SETTINGS PRINTER The Printer position enables settin...

Страница 65: ...ed and presented as a bar on the spectrum plot Results of 1 1 octave and 1 3 octave analysis spectra can be examined by the user on a display in the Spectrum presentation mode The read out of the spec...

Страница 66: ...Spectrum position enables selecting the pre weighting broadband frequency filter and the LEQ detector for the octave or third octave analysis ENT Following weighting filters are available for the 1 1...

Страница 67: ...tral frequency for the cursor position 5 Cursor position 6 Total values You can shift the Y axis up or down during the spectrum presentation by with the key You can change the cursor position with the...

Страница 68: ...witches on or off the grid in the spectrum view Automatic Y scale adjustment The Autoscale position switches on or off the automatic adjustment of the Y axis scale dynamic range to the current spread...

Страница 69: ...has a programmable five automatic pauses Programable automatic pauses Automatic pause s can be switched off Off or can be programmed based on the RTC time On If Pause is On two additional positions a...

Страница 70: ...lation of the ULT results 70dB 140dB PTC Threshold Level Peak Threshold Counter is a threshold level for calculation of the PTC results 70dB 140dB 11 4 CHECKING MEASUREMENT RANGE RANGE The measurement...

Страница 71: ...SIMETER RESULTS In the Dose Meter function next results are measured and displayed TIME Lpeak Lmax Lmin L DOSE D_8h PrDOSE LAV Leq LE SEL8 E E_8h LEPd PSEL Ltm3 Ltm5 Ln PTC PTP ULT TWA PrTWA Lc a EX S...

Страница 72: ...nd RT30 is calculated for the measured room response Note It is recommended to familiarize with Appendix E before proceeding This chapter describes only the navigation of the instruments whereas Appen...

Страница 73: ...uring mode The Noise Mar parameter defines the margin value to the calculated noise level for more detail see Appendix E This parameter can be set in the range 0 0 dB 20 0 dB with 0 1 dB step default...

Страница 74: ...d octave bands Note It is necessary to switch on the sound source before starting the measurement because of the trigger requirements for more details see Appendix E If it is necessary to start the in...

Страница 75: ...e results for more details see Appendix E 12 1 AVERAGING RT60 RESULTS If Averaging is On you can average results for consecutive measurements following next steps 1 Being in the RT60 view press the ke...

Страница 76: ...he instrument unscrew the microphone protective ring and pull the microphone to extract it from the USB C type connector To reinstall the microphone insert it into the USB C type connector and screw o...

Страница 77: ...releases available for download 13 5 PRESERVATION OF INTERNAL BATTERIES To preserve the life of the internal batteries it is recommended that the instrument is turned off when it is stored In case of...

Страница 78: ...hould your SVANTEK professional measurement equipment need to be returned for repair or for calibration please contact the service office at the following number or contact via the SVANTEK website Ser...

Страница 79: ...weighting filters and LEQ detectors Manual 3 1 1 1 Octave Measurement Function enabling calculation of Level Meter results and 1 1 octave sound results in accordance with Class 2 IEC 61260 1 2014 1 1...

Страница 80: ...ased on the reference signal measurement with the use of a sound calibrator Manual 3 2 1 Calibration Measure Measured by the instrument reference signal level without calibration factor correction Man...

Страница 81: ...Reference Elapsed time Time from the measurement start that is displayed under the result in the format mm ss in the range from 00 00 to 59 59 or in the format hh mm ss in the range from 01 00 00 to...

Страница 82: ...Z and accordingly displayed as LAeq LCeq or LZeq Appendix D L Time weighted sound level expressed at observation time expressed in dB It is measured with frequency weighting A C or Z and time weighti...

Страница 83: ...noise during the night and the evening The instrument displays Ld Le Ln Lde Len Lnd or Lden depending on the day and night time which the measurement covers Due to different country requirements it is...

Страница 84: ...f the overpasses of the Threshold Level by Lpeak result This result is incremented in 100 ms intervals Appendix D PTP PTC result expressed in percent Appendix D ULT Upper Limit Time time that SPL exce...

Страница 85: ...d on the basis of 100ms Leq results Appendix D LR15 15 minutes running Leq the rolling sliding Leq window for the last 15 minutes of measurement 900 seconds moving with 1 second step Appendix D LR60 6...

Страница 86: ...er of measurement integration repetitions after the Start key pressure This enables to make a series of measurements without pressing the Start key and save this series in the results file Manual 4 1...

Страница 87: ...for all results except Lpeak in accordance with most applicable world standards Z A C B LF Manual 4 3 Appendix C Appendix D Filter Peak Weighting filter applied in the profile for Lpeak results calcu...

Страница 88: ...If the instrument is waiting for the trigger condition the appropriate trigger icon is flashing on the display alternatively with the play icon Manual 4 2 Level Type of trigger that starts the 1 seco...

Страница 89: ...ompared with the threshold level Level for triggering RMS measured in the first profile Leq 1 Manual 4 2 Level Threshold level of the Source for trigger condition fulfilment Manual 4 2 Gradient Thresh...

Страница 90: ...c times of a day Manual 4 5 1 Logger Step Time of measuring integrating Logger Results and recording them to the logger file same meaning as Integration Period for Summary Results Logger Step can be s...

Страница 91: ...the display alternatively with the logger icon Manual 4 5 3 Level Type of trigger that starts logging of Logger Results under the condition value of the Leq result Source integrated by the Logger Step...

Страница 92: ...ignal icon Manual 4 5 4 Slope Type of trigger that starts the signal recording for Recording Time under the condition rising value of the LEQ result Source integrated during 0 5 ms passes above the th...

Страница 93: ...riod Type of trigger that starts the signal recording for Recording Time every time the measurement starts If Integration Period is shorter than Recording Time the event recording will be continued fo...

Страница 94: ...rigger condition The available values can be selected from 1 s to 8 h Recording stops after Recording Time or earlier if the measurement is stopped manually Manual 4 5 4 Spectrum Screen that enables s...

Страница 95: ...time is considered for the LEPd result calculation Manual 11 5 Appendix D Criterion Level Steady noise level permitted for a full eight hour work shift Manual 11 3 Threshold Level Noise level limit b...

Страница 96: ...e method depends on the used type of the sound source Manual 12 2 Recording Time Time of measurement data sound pressure level decay curve registration during RT60 calculations 1s 30 s or Auto Manual...

Страница 97: ...ed sound is below the Level value the RT60 measurement will not start Manual 12 2 14 5 DISPLAY PARAMETERS Name Description Screen Reference Display Section of the Main Menu that enables setting of the...

Страница 98: ...ectra 1 1 Octave and 1 3 Octave Manual 5 1 10 3 RT60 results view View of RT60 results calculated for octave or third octave bands EDT RT20 RT30 and averaged results AEDT ART20 ART30 Manual 12 3 Displ...

Страница 99: ...Dosimeter Results Screen that enables selecting the Dose Meter results which will be presented on the display Manual 5 3 Logger Results Screen that enables selecting time history results which will be...

Страница 100: ...results for the 1 1 Octave or 1 3 Octave bands Manual 10 3 3 Screen Setup Screen that enables setting the screen brightness and power saving Manual 5 5 Dim Mode Screen dimming in no activity after de...

Страница 101: ...interface that limits instrument s settings to the most frequent used positions hiding other positions Before activation of the Simple mode the user may decide whether to leave settings of hiding pos...

Страница 102: ...eration should be performed Time Out Manual 7 7 RTC Instrument s Real Time Clock This clock is displayed in the upper right corner places of the display Manual 7 8 Unit Label Information about the ins...

Страница 103: ...f the file name for recording of voice comments Manual 8 3 Leq Lav Position in the Auxiliary Setup screen that enables to control displaying of Leq and Lav results Both or Mutually Exclusive Manual 8...

Страница 104: ...le from the internal Flash disc or RAM memory 5 read out of the statistical analysis results 7 special control functions 9 writing the data file into the internal flash disk Dread write the data file...

Страница 105: ...filter is selected for 1 1 OCTAVE or 1 3 OCTAVE analysis f1 FAST detector is selected in profile 1 SLM function C1 1 IMPULSE detector is chosen in profile 2 SLM function C0 2 SLOW detector is selecte...

Страница 106: ...ile 3 is None h0 3 exchange rate in profile 1 is set to 3 x3 1 exchange rate in profile 2 is set to 3 x3 2 exchange rate in profile 3 is set to 5 x5 3 measurement trigger mode is switched off m0 LEQ r...

Страница 107: ...value in dB U LE result ccc the value in dB B k Lden result ccc the value in dB k flag determining the kind of the result I nn LEPd result ccc the value in dB nn the value of Exposure Time in minutes...

Страница 108: ...ue in l ULT result ccc value in seconds W TWA result ccc the value in dB w PrTWA result ccc the value in dB a Lc a result ccc the value in dB The exemplary results of the instrument s response after s...

Страница 109: ...transmission counter MSB of the transmission counter data byte data byte Status Byte gives the information about the current state of the instrument D7 D6 D5 D4 D3 D2 D1 D0 where D7 0 means that over...

Страница 110: ...t to the instrument All data words are sent as LSB MSB When an error is detected in the file specification or data the instrument will send 4 The catalogue of the files is a set of the records contain...

Страница 111: ...ed D d command cannot be executed 4 D r disk address offsetB nB function enables the user to read the file except of internal memory Response D r disk address offsetB nB data 5 D w name nBwr data func...

Страница 112: ...0 means overload does not happen 1 means overload appeared D6 1 reserved D5 0 instantaneous current result RUN State 1 final result STOP State D0 to D4 reserved bits Note There is not any succeeding t...

Страница 113: ...function Response format 7 AS e HH MM hh mm dW mR where e On e 1 Off e 0 HH hour of the measurement start MM minutes of the measurement start hh hour of the measurement stop mm minutes of the measure...

Страница 114: ...7 DL x 7 DL x This function enables x 1 or disables x 0 day time limits and returns the following sequence of characters 7 DL 7 DS file_name This function deletes setup file in SETUP directory specifi...

Страница 115: ...me 7 LS setup_name This function loads setup and writes settings into EEPROM The selected file must exist The function returns 7 LS 7 LW This function returns the name of last wave file in format 7 LW...

Страница 116: ...This function powers off the instrument 7 RT This function returns current real time clock settings in the format 7 RT hh mm ss DD MM YYYY where hh mm ss denotes the time and DD MM YYYY gives the date...

Страница 117: ...ftware version 7 VH This function returns the Hardboot software version For the unknown function and or in the case of the other error all these functions return the following sequence of characters 7...

Страница 118: ...le n F3 n C filter for profile n SLM 1 1OCTAVE 1 3OCTAVE functions n 1 2 3 Profile Number 1 2 or 3 DOSE functions n 4 5 6 Profile Number 1 2 or 3 Peak Filter type in profile n J J1 n Z filter for prof...

Страница 119: ...g S0 control code Dnns nn number in seconds Dnnm nn number in minutes Dnnh nn number in hours Repetition of the measurement cycles RepCycle K K0 infinity measurement finished by pressing the Stop or r...

Страница 120: ...ate x x2 p 2 x3 p 3 x4 p 4 x5 p 5 x6 p 6 p 1 2 3 profile number Logger T T0 switched off T1 switched on Delay in the start of measurement Y Ynn nn delay given in seconds 0 59 and 60 3600 with step 60s...

Страница 121: ...records saved in the logger after the fulfilment of the triggering condition nn 0 200 Threshold level for PTC calculation XC XCnnn p nnn level in dB 70 140 p 1 2 3 profile number Logger File Splitting...

Страница 122: ...is cf Tab B 1 14 header of the file from the logger cf Tab B 1 15 contents of the file from the logger cf Tab B 1 16 Other elements of the file structure are not obligatory for each file type stated a...

Страница 123: ...cf App B 4 8 13 Reserved Reserved Table B 1 3 Unit and software specification Word number Name Comment 0 0xnn02 02 nn specification s length 1 UnitNumberL unit number LSB word 2 UnitType type of the...

Страница 124: ...one 1 BY MEASUREMENT manual 2 REMOTE 3 FACTORY CALIBRATION 4 AUTOCALIBRATION 0xFFFF Calibration not performed 7 PostCalibrDate date of calibration performed after the measurement cf App B 4 8 PostCali...

Страница 125: ...tion cycle 0 infinity nnnn number of repetitions 1 1000 8 NofChannel number of channels 1 8 NofProf number of profiles 3 10 StartDelay start delay time 11 12 IntTimeSec integration time specified in s...

Страница 126: ...only DOSE METER 0 60 65 70 75 80 85 90 10 dB 27 ExchangeRate 1 the 2nd profile exchange rate only DOSE METER 2 3 4 5 6 23 CriterionLevel 2 the 3rd profile criterion level only DOSE METER 60 65 70 75 8...

Страница 127: ...every 1 hour synchronized to RTC 1440 The file is created on the specified times 43 SplitTime 1 Logger files splitting time 1 off 0 1439 Time in minutes Valid only if SplitMode is equal 1440 44 SplitT...

Страница 128: ...use no 5 in format 0xhhmm hh hour mm minute 63 PauseEnd 5 The end time of the pause no 5 in format 0xhhmm hh hour mm minute Table B 1 7 MEASUREMENT TRIGGER parameters Word number Name Comment 0 0xnn2B...

Страница 129: ...riggerPost number of the records taken into account after the fulfilment of the triggering condition 1 200 7 TriggerSampling reserved 8 TriggerRecTime reserved 9 TriggerStep trigger period given in 0...

Страница 130: ...nn2D 2D nn block s length 1 TriggerMode trigger mode 0 OFF 1 recording whole measurement 2 recording on trigger SLOPE 3 recording on trigger SLOPE 4 recording on trigger LEVEL 5 recording on trigger L...

Страница 131: ...rP 1 detector type in the 1st profile 0 IMP 1 FAST 2 SLOW 4 FilterP 1 filter type in the 1st profile 1 Z 2 A 3 C 5 B 6 LF 5 BufferP 1 logger contents in the 1st profile defined as a sum of 0 none 1 Lx...

Страница 132: ...calculation in the 2nd profile 1 Z 2 A 3 C 5 B 6 LF 13 reserved reserved 14 0xmm06 06 mm sub block s length 15 DetectorP 3 detector type in the 3rd profile 0 IMP 1 FAST 2 SLOW 16 FilterP 3 filter typ...

Страница 133: ...E_8h 0 E_8h result not displayed E_8h 1 result displayed 14 Lden 0 Lden result not displayed 1 Lden result displayed 15 LEPd 0 LEPd result not displayed 1 LEPd result displayed 16 PSEL 0 PSEL result n...

Страница 134: ...A mm sub block s length 11 NofClasses 3 number of classes in the third profile 120 12 BottomClass 3 bottom class boundary 10 dB in the third profile 13 ClassWidth 3 class width 10 dB in the third prof...

Страница 135: ...saved in Summary Results Record Word number Name Comment 0 0xnn07 07 nn block s length 1 0x0307 used_profile profile s mask 2 0xmm08 08 mm sub block s length 3 4 MeasureTime time of the measurement 5...

Страница 136: ...dB 33 Result 2 7 Lden value in the 2nd profile 100 dB 34 Result 2 8 Ltm3 value in the 2nd profile 100 dB 35 Result 2 9 Ltm5 value in the 2nd profile 100 dB 36 Result 2 10 reserved 37 Result 2 11 rese...

Страница 137: ...ly for exponential detector s type cf Tab B 1 6 Table B 1 18_DM Main results in the DOSE METER mode saved in Summary Results Record Word number Name Comment 0 0xnn07 07 nn block s length 1 0x0307 used...

Страница 138: ...profile 100 dB 35 Result 2 9 Ltm5 value in the 2nd profile 100 dB 36 Result 2 10 LAV value in the 2nd profile 100 dB 37 Result 2 11 TLAV value in the 2nd profile 100 dB 38 UnderRes 2 under range value...

Страница 139: ...B LF cf Tab B 1 12 y depends of the detector type in selected profile I imp F fast S slow cf Tab B 1 12 3 y only for exponential detector s type cf Tab B 1 6 Table B 1 19 Statistical levels saved in...

Страница 140: ...E frequency 100 Hz 2000 AUDIO BAND 3 NTer number of 1 3 OCTAVE values 31 AUDIO BAND 4 NTerTot number of TOTAL values 3 5 50 Tercje i 1 3 octave i value 100 dB i 1 NTer NTerTot 1 34 Table B 1 22 Result...

Страница 141: ...File end marker Word number Name Comment 0 0xFFFF file end marker B 2 STRUCTURE OF THE FILE CONTAINING RESULTS FROM LOGGER S FILE SvanPC file header cf Tab B 1 1 File header cf Tab B 1 2 Unit and soft...

Страница 142: ...f Tab B 1 12 result5 LAV result depending on the value of BufferP 1 cf Tab B 1 12 result6 LR15 result depending on the value of BufferP 1 cf Tab B 1 12 result7 LR60 result depending on the value of Bu...

Страница 143: ...with the state of the markers consists of one word 0x8nnn in which 12 bits nnn denote the state of the markers b11 state of 12 marker b10 state of 11 marker b1 state of 2 marker b0 state of 1 marker...

Страница 144: ...b11 bit thanks to it it is possible to analyse the recorded file starting from its end The HEADER format is as follows b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 where b15 1 b14 1 b13 0 b1...

Страница 145: ...b13 0 b12 1 bits b15 b12 9 constitute the marker of the frame b11 header type 0 HS 1 HE b10 1 denotes the first frame in the block b9 1 denotes the last frame in the block b7 1 denotes an error the sa...

Страница 146: ...denotes the undefined value Word number Name 0 0xC703 1 Length 2 Quality 3 Time Sec 4 Time Min 5 Time Hour 6 Date Day 7 Date Month 8 Date Year 9 Latitude Deg 10 Latitude Min 11 Latitude Sec 12 Latitu...

Страница 147: ...ation cf Tab B 1 3 SETUP DATA cf Tab B 1 23 File end marker cf Tab B 1 24 B 4 DATE AND TIME Following function written in C explain how the date and time are coded void ExtractDateTime int date unsign...

Страница 148: ...Pa Recommended calibrator SV 34B Class 2 sound calibrator 114 dB 1000 Hz or equivalent not included in the standard set Measured quantities The measured quantities for SLM mode are LXpeak LXYmax LXYm...

Страница 149: ...25 32 125 40 125 40 125 35 128 65 128 4 kHz 32 126 40 124 40 124 55 125 32 126 40 124 40 124 35 129 65 127 8 kHz 32 124 40 122 40 122 55 125 32 124 40 122 40 122 35 127 65 125 12 5 kHz 32 120 40 119 4...

Страница 150: ...converter are both detected The overload indication appears when the input signal amplitude is 0 5 dB above the declared Peak measurement range Underrange detector The instrument has the built in unde...

Страница 151: ...Environmental electrostatic and radio frequency criteria Effect of humidity 0 5 dB for 30 RH 90 at 40 C and 1000 Hz Effect of magnetic field below electrical noise level for 80 A m and 50 Hz Effect o...

Страница 152: ...1 15 4 05 Uncertainty IEC 62585 2012 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 35 Table C 4 Typical ST 973 and SV 973 frequency characteristics Frequency ST 973 Free Field response SV 973 Free Field c...

Страница 153: ...12 0 25 422 0 02 0 11 0 13 0 25 434 0 02 0 03 0 05 0 25 447 0 02 0 05 0 03 0 25 460 0 02 0 08 0 05 0 25 473 0 02 0 04 0 02 0 25 487 0 02 0 04 0 02 0 25 501 0 02 0 02 0 00 0 25 516 0 01 0 01 0 03 0 25...

Страница 154: ...5 1728 1 48 0 84 0 63 0 25 1778 1 36 0 69 0 66 0 25 1830 1 50 0 88 0 62 0 25 1884 1 32 0 43 0 89 0 25 1939 1 98 1 17 0 82 0 25 1995 1 90 1 15 0 75 0 25 2054 1 72 0 59 1 13 0 25 2113 1 75 0 66 1 09 0 2...

Страница 155: ...5 18 1 11 4 07 0 35 6683 5 20 1 30 3 90 0 35 6879 5 44 1 59 3 85 0 35 7079 5 04 1 43 3 61 0 35 7286 5 62 1 95 3 67 0 35 7499 5 40 1 95 3 45 0 35 7718 5 07 1 87 3 20 0 35 7943 4 44 1 10 3 33 0 35 8175...

Страница 156: ...s SLM Directional characteristics show deviation of Leq measured at different incidence angle from the Leq measured at 0 deg incidence angle Combined directional characteristics The round charts show...

Страница 157: ...SVAN 973 User Manual Appendixes 157 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz...

Страница 158: ...SVAN 973 User Manual Appendixes 158 1000 Hz 1250 Hz 1600 Hz 2000 Hz 2240 Hz 2500 Hz...

Страница 159: ...SVAN 973 User Manual Appendixes 159 2800 Hz 3150 Hz 3550 Hz 4000 Hz 4500 Hz 5000 Hz...

Страница 160: ...07 0 08 500 0 02 0 02 0 02 0 01 0 04 0 08 0 13 0 18 0 23 0 28 630 0 01 0 01 0 01 0 04 0 08 0 13 0 19 0 25 0 30 0 36 800 0 01 0 01 0 01 0 01 0 04 0 06 0 11 0 17 0 23 0 31 1000 0 00 0 02 0 05 0 08 0 10...

Страница 161: ...44 0 69 2800 1 55 1 38 1 68 1 89 1 89 1 76 1 53 1 40 1 56 1 89 3150 1 48 1 43 1 48 1 73 1 95 1 94 1 65 1 34 1 34 1 68 3550 0 95 0 92 0 92 1 05 1 23 1 15 0 66 0 30 0 51 1 00 4000 1 23 1 23 1 19 1 10 1...

Страница 162: ...0 06 0 05 0 03 0 02 0 01 0 00 500 0 20 0 15 0 10 0 06 0 02 0 01 630 0 20 0 14 0 08 0 06 0 03 0 01 800 0 15 0 11 0 07 0 04 0 02 0 01 1000 0 13 0 09 0 07 0 04 0 01 0 00 1250 0 18 0 12 0 07 0 04 0 01 0 0...

Страница 163: ...TWA PrTWA EX expected Leq value SD standard Leq deviation OVL overload time Definitions for above mentioned parameters are given in Appendix D Additional features Overload indication Under range indic...

Страница 164: ...1 41 upper measuring range of the RMS LEQ and SPL is reduced The valid upper limit can be calculated according to the below given formula where A is the upper limit for the sinusoidal signal Example...

Страница 165: ...averaging Slow S according to IEC 61672 1 2013 for Class 2 Equivalent Time Constant 1000 ms Fast F according to IEC 61672 1 2013 for Class 2 Equivalent Time Constant 125 ms Impulse I according to IEC...

Страница 166: ...time weighting F are selected and the SPL measurements are considered The greatest susceptibility is achieved when the SLM is placed parallel to the radio frequency field In addition if there is an e...

Страница 167: ...ertainty IEC 62585 2012 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 35 Table C 10 Typical ST 973 and SV 973 frequency characteristics Frequency ST 973 Free Field response SV 973 Free Field compensated r...

Страница 168: ...09 0 25 434 0 01 0 01 0 00 0 25 447 0 00 0 07 0 06 0 25 460 0 00 0 08 0 08 0 25 473 0 00 0 06 0 06 0 25 487 0 01 0 06 0 06 0 25 501 0 01 0 03 0 04 0 25 516 0 01 0 03 0 04 0 25 531 0 01 0 01 0 01 0 25...

Страница 169: ...5 1778 1 23 0 45 0 77 0 25 1830 1 37 0 60 0 76 0 25 1884 1 16 0 13 1 04 0 25 1939 1 82 0 83 1 00 0 25 1995 1 74 0 80 0 94 0 25 2054 1 51 0 22 1 29 0 25 2113 1 52 0 24 1 28 0 25 2175 1 90 0 59 1 30 0 2...

Страница 170: ...4 0 35 6683 4 56 1 39 3 17 0 35 6879 4 87 1 77 3 09 0 35 7079 4 33 1 46 2 86 0 35 7286 4 86 1 91 2 95 0 35 7499 5 01 1 91 3 10 0 35 7718 4 60 1 42 3 18 0 35 7943 4 25 0 87 3 38 0 35 8175 4 32 2 50 1 8...

Страница 171: ...s SEM Directional characteristics show deviation of Leq measured at different incidence angle from the Leq measured at 0 deg incidence angle Combined directional characteristics The round charts show...

Страница 172: ...SVAN 973 User Manual Appendixes 172 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz...

Страница 173: ...SVAN 973 User Manual Appendixes 173 1000 Hz 1250 Hz 1600 Hz 2000 Hz 2240 Hz 2500 Hz...

Страница 174: ...SVAN 973 User Manual Appendixes 174 2800 Hz 3150 Hz 3550 Hz 4000 Hz 4500 Hz 5000 Hz...

Страница 175: ...06 0 06 500 0 02 0 01 0 01 0 02 0 04 0 07 0 13 0 18 0 21 0 26 630 0 00 0 01 0 03 0 06 0 10 0 15 0 21 0 27 0 33 0 38 800 0 01 0 01 0 01 0 02 0 03 0 07 0 11 0 16 0 23 0 32 1000 0 01 0 02 0 05 0 08 0 12...

Страница 176: ...40 0 67 2800 1 57 1 31 1 60 1 90 1 91 1 80 1 58 1 43 1 64 1 90 3150 1 64 1 59 1 60 1 83 2 05 2 03 1 77 1 48 1 47 1 84 3550 0 92 0 89 0 89 0 99 1 19 1 12 0 66 0 31 0 50 0 98 4000 1 33 1 31 1 30 1 32 1...

Страница 177: ...0 09 0 07 0 05 0 04 0 02 0 02 500 0 21 0 16 0 10 0 06 0 04 0 02 630 0 21 0 15 0 10 0 07 0 04 0 01 800 0 14 0 10 0 08 0 05 0 02 0 01 1000 0 12 0 09 0 06 0 03 0 02 0 01 1250 0 14 0 10 0 06 0 02 0 01 0 0...

Страница 178: ...74 0 07 0 02 0 09 0 20 282 0 07 0 02 0 09 0 20 290 0 06 0 02 0 08 0 20 299 0 06 0 02 0 08 0 20 307 0 05 0 02 0 07 0 20 316 0 05 0 02 0 07 0 20 325 0 05 0 02 0 07 0 20 335 0 05 0 02 0 07 0 20 345 0 05...

Страница 179: ...0 00 0 20 891 0 15 0 15 0 00 0 20 917 0 16 0 15 0 01 0 20 944 0 17 0 16 0 01 0 20 972 0 18 0 17 0 01 0 20 1000 0 19 0 18 0 01 0 20 1029 0 21 0 19 0 02 0 20 1059 0 22 0 20 0 02 0 20 1090 0 23 0 21 0 02...

Страница 180: ...20 3981 0 13 0 17 0 04 0 20 4097 0 15 0 16 0 01 0 30 4217 0 17 0 15 0 02 0 30 4340 0 19 0 15 0 04 0 30 4467 0 21 0 15 0 06 0 30 4597 0 24 0 15 0 09 0 30 4732 0 27 0 16 0 11 0 30 4870 0 30 0 17 0 13 0...

Страница 181: ...ements of IEC 348 for the 2nd Class devices The input voltage shall not exceed the limits between 0 V and 3 V SL 973 the input voltage shall not exceed the limits between 3 V and 3 V Impedance SV 973...

Страница 182: ...5 C for sinusoidal signal 114 dBRMS in the band 20 Hz 10 kHz with the Z input filter Measurement error in the full temperature range 0 1 dB when the temperature is from 10 C to 50 C for the sinusoida...

Страница 183: ...d T 23 C Digital Filters Weighting filters A meeting requirements of the IEC 61672 1 2013 standard for the Class 1 A filter C meeting requirements of the IEC 61672 1 2013 standard for the Class 1 C fi...

Страница 184: ...SVAN 973 User Manual Appendixes 184 8 0 kHz 1 1 octave filter 4 0 kHz 1 1 octave filter 2 0 kHz 1 1 octave filter 1 0 kHz 1 1 octave filter...

Страница 185: ...SVAN 973 User Manual Appendixes 185 500 Hz 1 1 octave filter 250 Hz 1 1 octave filter...

Страница 186: ...ual Appendixes 186 125 Hz 1 1 octave filter 63 0 Hz 1 1 octave filter 31 5 Hz 1 1 octave filter 1 3 Octave filters 28 filters with centre frequencies from 20 Hz to 10 kHz base 10 IEC 61260 1 2014 stan...

Страница 187: ...SVAN 973 User Manual Appendixes 187 1 3 octave filters for 8 0 kHz 1 1 octave filter 1 3 octave filters for 4 0 kHz 1 1 octave filter 1 3 octave filters for 2 0 kHz 1 1 octave filter...

Страница 188: ...anual Appendixes 188 1 3 octave filters for 1 00 kHz 1 1 octave filter 1 3 octave filters for 500 Hz 1 1 octave filter 1 3 octave filters for 250 Hz 1 1 octave filter 1 3 octave filters for 125 Hz 1 1...

Страница 189: ...SVAN 973 User Manual Appendixes 189 1 3 octave filters for 63 0 Hz 1 1 octave filter 1 3 octave filters for 31 5 Hz 1 1 octave filter 1 3 octave filters for 16 0 Hz 1 1 octave filter...

Страница 190: ...ser Manual Appendixes 190 C 5 FREQUENCY CHARACTERISTICS OF THE IMPLEMENTED DIGITAL FILTERS Z Filter Class 2 according to the IEC 61672 1 2013 standard A Filter Class 2 according to the IEC 61672 1 201...

Страница 191: ...SVAN 973 User Manual Appendixes 191 C Filter Class 2 according to the IEC 61672 1 2013 standard B filter Class 2 according to the IEC 651...

Страница 192: ...SVAN 973 User Manual Appendixes 192 LF filter according to EPA 93 F105 02 104 Low Frequency Noise Control Regulations...

Страница 193: ...Signal name Description Contact no Contact no A1 B1 A1 B1 VA_TEDS MEMS Microphones Supply Voltage TEDS I O A2 B2 A2 B2 MIC_TMP MEMS Microphones Temperature Measurement A3 B3 A3 B3 S3_N MEMS 3 Differe...

Страница 194: ...ce for the meter USB C socket external view Table C 16 Pin out of the USB C device connector Contact no Signal name Description A1 B1 GND Ground return A2 B2 SSTXp1 not used A3 B3 SSTXn1 not used A4 B...

Страница 195: ...5 6 DSR 4 connected to pin 6 7 RTS 8 8 CTS 7 9 GND 9 not connected Power Supply Instrument is dedicated for the operation from the internal four replaceable AAA batteries Power consumption from the 6V...

Страница 196: ...test report This transmitter must not be co located or operating in conjunction with any other antenna or transmitter except in accordance with FCC multi transmitter product procedures ISEDC Statemen...

Страница 197: ...apter C 7 CE mark indicates compliance with RED Directive 2014 53 EU see DECLARATION OF CONFORMITY Art 3 1a Safety Art 3 1b Electromagnetic Compatibility Art 3 2 Radio Note Electromagnetic compatibili...

Страница 198: ...ard for radio equipment and services Part 17 Specific conditions for Broadband Data Transmission Systems Harmonised standard covering the essential requirements of article 3 1 b of Directive 2014 53 E...

Страница 199: ...frequency weighted sound pressure with the weighting filter W Sound pressure is expressed in pascals Pa t pW Instantaneous frequency and time weighted sound pressure with the weighting filter W and t...

Страница 200: ...ound level a function of time depends on the selected threshold level In case None option is selected t L t Ld In other cases when Threshold Level is not set to none and equal to 60 dB or up to 90 dB...

Страница 201: ...weightings F S I symbols are LAF LAS LCF LCS etc 2 0 2 W p t p log 10 L L A C Z eq Time averaged equivalent continuous sound level Leq expressed in dB for frequency weightings A C Z symbols are LAeq...

Страница 202: ...r Td 0 Te 0 Tn 0 e T 2 0 W e dt p t r T 1 log 0 1 dB 5 Le Lnight Lnight is calculated for Td 0 Te 0 Tn 0 n T 2 0 W n dt p t r T 1 log 0 1 dB 10 Ln Lde Lde is calculated for Td 0 Te 0 Tn 0 10 Le 10 Ld...

Страница 203: ...of the whole day acceptable value T 0 q L t L h 8 dt 10 T 100 DOSE c d D_8h The D_8h result is the quantity of noise received by the worker during 8 hours DOSE T T dt 10 T 100 h 8 _ D h 8 T 0 q L t L...

Страница 204: ...nd a Reference time of 8 h Mainly used in the USA for assessing the noise exposure for a worker during a workday Sound levels at or above the THRESHOLD LEVEL are averaged into the calculations relatin...

Страница 205: ...P total observation period In case when the class interval approaches infinity the probability of L t tends to the probability of k L In practice L value is strictly determined and it depends mainly...

Страница 206: ...l cursor and find out the crossing point between the cumulative density function and the cursor In the instrument the user can determine 10 statistical levels from L01 to L99 1 step of observation per...

Страница 207: ...he size of the room and the nature of the materials used in its construction The graphs below present the reverberation time nature in the case when only one frequency is emitted Fig 1 The acoustic pr...

Страница 208: ...ecay curve region is pointed out by markers t1 and t3 cf Fig 2 It is checked whether the selected decay curve region has proper dynamics for the EDT calculation L1 L2 10 dB L2 L3 noise margin It is re...

Страница 209: ...urve region is pointed out by markers t1 and t4 cf Fig 4 It is checked whether the selected decay curve region has proper dynamics to the RT 30 calculation L1 L4 5 30 dB noise margin It is recommended...

Страница 210: ...ency band The most critical parameter of the omnidirectional sound source is emitted sound pressure level as it was mentioned in the beginning of the appendix The graphical illustration of the data re...

Страница 211: ...e path Menu Measurement RT60 Settings parameter The above graph shows that the proper setting of the Recording Time value is very important The registration time has to be long enough to acquire suffi...

Страница 212: ...t back till point ts to allow recognising the beginning of the decay region In the SVAN xxx instruments this time is equal to the Time Step path Menu Measurement RT60 Settings parameter value multipli...

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