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SW-BA-e-2020 

7.2  Correcting the Draft Shield in the Free Field 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
Note: The frequency marked with * is not prescribed in the standard, the exact frequency can be found in IEC 61672-1.

 

 

Freq. [Hz] 

Value [dB] 

Freq. [Hz] 

Value [dB] 

Freq. [Hz] 

Value [dB] 

*50,119 

-0,04 

*398,11 

0,06 

3162,3 

0,12 

*63,096 

0,04 

*501,19 

0,04 

3981,1 

-0,24 

*79,433 

0,06 

*630,96 

0,06 

5011,9 

-0,30 

*100,00 

0,00 

*794,33 

0,09 

6200,6 

-0,33 

*125,89 

0,03 

1000,0 

0,14 

7943,3 

-0,66 

*158,49 

0,02 

1258,9 

0,24 

10000 

-0,71 

*199,53 

0,03 

1584,9 

0,30 

12589 

-1,04 

*251,19 

0,02 

1995,3 

0,37 

15849 

-1,37 

*316,23 

-0,01 

2511,9 

0,41 

*19953 

-1,92 

Extended uncertainties: U=0.15 (k=2) at <= 4 kHz, U=0.21 (k=2) at > 4 kHz. 

dB 

Hz 

-2,0

-1,5

-1,0

-0,5

0,0

0,5

1,0

*50.1

187

*63.0

957

*79.4

328

*100.

000

*125.

893

*158.

489

*199.

526

*251.

189

*316.

228

*398.

107

*501.

187

*630.

957

*794.

328

1.0

0000k

1.2

5893k

1.5

8489k

1.9

9526k

2.5

1189k

3.1

6228k

3.9

8107k

5.0

1187k

6.3

0957k

7.9

4328k

10.

0000k

12.

5893k

15.

8489k

*19.9

526k

Correcting the Draft Shield in the open field 

Summary of Contents for SW 1000

Page 1: ...2336 Balingen e mail info kern sohn com Phone 49 0 7433 9933 0 Fax 49 0 7433 9933 149 Internet www sauter eu Instruction Manual Sound Level Meter SAUTER SW 1000 SW 2000 Version 2 0 04 2020 GB SW BA e 2020 PROFESSIONAL MEASURING ...

Page 2: ...s List 8 1 9 Illustration Scope of delivery 8 2 View and operation 8 2 1 Keypad 9 2 2 Microphone connection 10 2 3 Draft shield 11 2 4 Data and power supply connection 11 2 5 Battery 13 2 6 GPS 14 3 measurement screen 15 3 1 Symbols and meaning of the screen display 15 3 2 Screen in Level Measurement Mode 16 3 3 Screen of the 1 1 octave mode 18 4 operation and setting of the menu 19 4 1 Function 1...

Page 3: ...tions from the housing of the sound level meter and sound scattering around the microphone 49 7 2 Correcting the Draft Shield in the Free Field 50 7 3 Corrections of the electret microphone 51 7 4 Typical frequency response and corresponding upper limit 52 7 5 Technical data of the 1 1 octave filter 53 7 6 Glossary 53 ...

Page 4: ...ped algorithm has only one measurement range with a dynamic range of more than 120 dB but still meets the standard SW 1000 is a class 1 measuring instrument and the SW 2000 is a class 2 measuring instrument 1 2 Applications Simple noise measurement Determination of environmental noise Product Quality Control Evaluation of technical measures for noise reduction 1 3 Functions Class 1 SW 1000 and Cla...

Page 5: ... Standard GB T 3785 1 2010 IEC 60651 1979 IEC 60804 2000 IEC 61672 1 2013 ANSI S1 4 1983 ANSI S1 43 1997 octave1 1 1 octave mid frequencies 31 5 Hz to 16 kHz GB T 3241 2010 IEC 61260 1 2014 ANSI S1 11 2004 1 1 octave center frequencies 31 5 Hz to 8 kHz GB T 3241 2010 IEC 61260 1 2014 ANSI S1 11 2004 Supplied Microphone MPA231T Pre polarized measuring microphone 1 2 class 1 Sensitivity 50 mV Pa Fre...

Page 6: ...er 6 GΩ Range setting Single range to cover the entire dynamic range Resolution 24 bits Sampling rate 48 kHz Time course Time domain noise curve display Duration 1 minute 2 minutes 10 minutes LCD display LCD 160 x 160 with white backlight 14 contrast levels display update in one second Mass storage 4G Micro SD card TF card Post processing Post processing software VA SLM for reading analyzing and g...

Page 7: ... acquisition 160 dBm cold start 147 dBm hot start 156 dBm Horizontal position accuracy 2 5 m time accuracy 30 ns speed accuracy 0 1 m s update rate 1 Hz operating limits Dynamic 4 g height 50 000 m speed 500 m s Calibrator CA111 Class 1 94 dB 114 dB 1 kHz Printer Mini thermal printer RS 232 connection Note 1 For BSWA 200 instrument ignore the result above 12 5 kHz due to the microphone frequency r...

Page 8: ...kaline batteries LR6 AA AM3 7 Power supply unit Power supply unit 9 V 500 mA 8 Mini USB cable For connection to the computer Option 1 GPS module and antenna 2 Tribrach SW A05 Stand for sound pressure measuring device 3 Printed operating manual Printed operating manual 1 9 Illustration Scope of delivery Note The details of the parts list may vary depending on the order 2 View and operation The meas...

Page 9: ... ESC key Enter To call up the menu of the next level or to confirm parameter changes or to save the current data in CSD format when the measuring instrument is stopped backlighting To switch on or off the LCD backlight The backlight delay can be set in the menu For more details see 4 4 2 Backlighting Start Stop To start or stop the measurement Use the up arrow to select the menu item or change the...

Page 10: ...is for connecting the microphone and preamplifier microphone and preamplifier are usually mounted together in one housing The TNC connector is a threaded coaxial connector The SW 1000 measuring instrument is equipped with a class 1 microphone the SW 2000 measuring instrument with a class 2 microphone ...

Page 11: ... supply The current technical data for the power supply are 4 mA 24 V If the voltage exceeds 30 V the microphone will be damaged The SW 1000 SW 2000 sound level meter has an internal ICCD power supply to which the microphone can be connected directly Connect the microphone to the TNC connector Then turn the thread until the parts are firmly connected 2 3 Draft shield The sound pressure meter is eq...

Page 12: ...er installation required and address the sound pressure meter via the RS 232 protocol for more information see 5 Note The power supply must have a current of at least 1 A and the cable must be able to transmit this current do not use a cable with ferrite bead for the power supply After connecting to the computer select the working mode Otherwise the computer will not be able to recognize the USB i...

Page 13: ...new batteries together Remove the batteries when the instrument is not in use The total voltage of the 4 battery cells must not exceed 14 V otherwise the sound level meter will be damaged Practical tests show that the 4 alkaline battery cells are sufficient for an operation of about 10 hours depending on the battery When using Eneloop BK 3HCCA 4BC batteries nominal capacity 2450 mAh the sound pres...

Page 14: ...0 bps and depends on the signal strength of the satellite The high bit error rate can increase the download time for the ephemeris or cause the download to fail completely The sound pressure meter can store the ephemeris for about 30 minutes after the GPS module is turned off The ephemeris is only valid for 2 hours Signal to noise ratio of the satellite The strength of the satellite s position sig...

Page 15: ...op Describes the measurement status Overload and underrange indication A permanently displayed arrow indicates that the current status is Overload or Underrange An arrow that is not filled in indicates that the instrument has fallen below the range during the integral period or that the instrument has been overloaded When the new integral period begins the symbol for overload or underrange disappe...

Page 16: ... to the integral period symbol indicates the elapsed time The measurement stops when the elapsed time is equal to the total measuring time integral period repetition The symbols in the same row are displayed simultaneously All icons can appear on any screen and have the same meaning 3 2 Screen in Level Measurement Mode Main screen Displays measurement data filter detector mode and profile number T...

Page 17: ...e domain curve 1 minute 2 minutes and 10 minutes can be adjusted Press ESC to clear the screen and display the curve again Adjustable measuring page 1 the user can set the parameters of the 14 measuring sets The first 7 measurement sets can be displayed in this screen Adjustable measuring page 2 the user can set the parameters of the 14 measuring sets The last 7 measurement sets can be displayed i...

Page 18: ... 1 octave histogram Displays 10 bands from 31 5 Hz 16 kHz and LAeq LBeq LCeq LZeq as a bar graph Press the arrow keys to display the detailed value of each band A threshold value can be defined for each band The LED lights red when the data exceeds the threshold Octave table page 1 display of measured data from 31 5 Hz 500 Hz The LED lights red and appears when the data exceeds the threshold value...

Page 19: ...surement and 1 1 octave measurement Press the arrow keys to select the measurement mode Press the Enter button to save the setting and return to the previous menu Press the ESC button to return to the previous menu 4 2 Calibration Select the Calibration option and press the Enter button to enter this menu The sensitivity of the microphone is influenced by numerous factors such as temperature humid...

Page 20: ...the arrow keys to select the value save it with the Enter key and return to the last menu with the ESC key An entry with the end F indicates that the data set was calibrated with the method With calibration factor 4 2 3 Conversion of calibration factor and sensitivity The sensitivity can be calculated with the following formulas The calibration factor can also be calculated from the sensitivity an...

Page 21: ...SW BA e 2020 21 2 Then switch on the calibrator and set a constant sound level for example 94 dB ...

Page 22: ...calibration is finished the sound pressure meter updates the calibration factor Press the Enter button to accept the results 6 Go back to the main screen and press Start Stopp to start the measurement The current measurement result in this example is 93 8 dB if the calibrator is in good working order 4 3 Measurement There are 13 menu options in the Measurement menu Use the arrow keys to select opt...

Page 23: ...s to select the following option Inf 1 through 9999 SWN Logger SWN Protocol Press the arrow keys to switch over When you select this option the sound pressure meter saves the data in SWN OCT files The SWN OCT files store the time history data The data source in Sound Pressure Gauge Mode is Profile 1 3 selected in the SWN Save option of the Profile 1 3 menu the data is saved as an SWN file In 1 1 o...

Page 24: ...and the peak C range Due to the newly developed algorithms there is only one measuring range the measuring range no longer needs to be switched The algorithm meets the requirements for a pulse frequency response of up to 0 25 ms with an error of only 0 1 dB at 4 kHz For pulse trains of 0 125 ms at 4 kHz the error is 0 4 dB Linearity range The measurement result can only be considered correct if th...

Page 25: ...to select the following option Fast Slow and Pulse mode Defines the integral mode of Profile 1 3 Press to select the following option SPL PEAK LEQ MAX and MIN SWN Save With this option you define which data should be stored in the SWN file since the data source of the SWN file is Profile 1 3 This option has no relation to the screen display Press to select the following option LEQ PEAK MAX or MIN ...

Page 26: ... 1 99 Example LN1 10 80 dB means that in the integral period 10 of the measured data are above 80 dB The LN result depends on the integral period The result is reset when a new integral period begins 4 3 8 Time history Use the arrow keys to set the data source and the duration of the time course Profile With the arrow keys you can set the data source of the time history Profile 1 Profile 2 Profile...

Page 27: ...set the options Start Day Start Time and Repeat Interval for the timer Press the arrow keys to select To start measurements with a program a new function called Timer was introduced The user can program the measurement to start at 00 00 the next day take several minutes of measurements and repeat every hour to achieve an automatic measurement over 24 hours Timer Use the arrow keys to set the worki...

Page 28: ...tal integral time integral time x repetition 5 s because a fixed delay of 3 s is set for the timer when measurement is triggered and 2 more seconds are required before the delay You must not change the settings when the timer is running Otherwise the timer is defective ...

Page 29: ...5 min and Repeat to 1 Activate SWN protocol and CSD protocol Set the SWN protocol step to 1s and the CSD protocol step to 5 min Set the timer to loop mode so that the measurement is triggered again and again Set the desired date as Start Day Set the Start Time as 00 00 This is the time at which the measurement is triggered for the first time Set the Repeat Interval to 1 h so that the measurement i...

Page 30: ...ically when the total voltage of the 4 cells of the alkaline battery falls below 3 6 V 4 4 4 Trigger In the Trigger menu you can switch the function of the trigger on and off The trigger is an analog input with which you can start or stop the measurement for the sound pressure meter by remote control The trigger input is located on the bottom of the sound pressure meter headphone jack 3 5 mm The m...

Page 31: ...calibrated with a reference clock with an average error of 2 ppm maximum error 3 ppm The time accuracy is less than 10 ppm at room temperature 26 seconds within 30 days The maximum time error for internal tests at 25 C was about 5 to 8 seconds The accuracy of the system clock may vary depending on the temperature as there is no temperature compensation With the typical temperature curve in the ill...

Page 32: ...vel meter has an automatic switch off function to reduce power consumption If the sound level meter remains in stop status and no button is pressed for a certain period of time the instrument will shut down according to this setting The following settings are available for the auto power off option 1 minute 5 minutes 10 minutes 30 minutes Off Press the arrow keys to select Press Enter to save the ...

Page 33: ... interface 4800 bps 9600 bps 19200 bps Press the arrow keys to select The following options are supported Data flow control See 5 2 7 Data flow control With the data flow control you can set the data flow mode on remote control The options are Hardware Software Press the arrow keys to select Answer Answer see 5 3 Instructions for further information This allows you to enable or disable the respons...

Page 34: ...ys Deleting is done in the same way as in the SWN File menu Select Option from the CSD File menu then press the arrow keys to display or print the CSD file After selecting the file number and action press Enter to display or print the contents of the file Use the arrow keys to browse the file contents in display mode The print mode is almost identical to the display mode Press the Enter button to ...

Page 35: ...ther system especially if a power failure is expected The sound level meter automatically switches on again after a power failure Boat and Auto Meas Start and Auto Meas In this case you must set the hardware switch for the mode to Boot If you select this mode the sound level meter not only turns on as soon as the operating voltage is applied but also starts measuring If the sound level meter has b...

Page 36: ... via the USB cable The sound level meter can be recognized by the computer as a removable USB drive without driver installation The files in the Micro SD card can be accessed directly using Windows Explorer Modem Mode Modem Mode In this case when connected to a computer via the USB cable the device always operates in modem mode modem mode without query The sound level meter can be recognised by th...

Page 37: ...or numbered label Press the Enter button if a template exists to load or delete it 4 4 13 About The About menu displays the type class and serial number version and HWID hardware ID of the sound level meter 4 5 Language The sound level meter supports six languages English Chinese Portuguese Spanish German and French Use the arrow keys to select the appropriate language and press Enter to save the ...

Page 38: ...s higher than the lower limit of the linear measurement range of the sound level meter 4 6 2 DC OUT direct voltage output The DC voltage output is used to output the analog DC voltage signal which is proportional to the measurement result with a ratio of 10 mV dB For example at 93 8 dB the output will output 938 mV This option is recommended for filtering or averaging the output signal to eliminat...

Page 39: ...r is equipped with a serial interface RS 232 The user can modify the configuration of the sound level meter via the serial interface and start and stop the sound level meter request the current measured value parameters and process the results further The operation via the serial interface does not change the operation via the keyboard 5 1 Hardware configuration and interface settings The SW 1000 ...

Page 40: ...to distinguish between several sound level meters in a network When the sound level meter receives a command block it compares the ID in the command block with its own ID If both match the corresponding operation is performed If not the command is ignored The response block returned by the sound level meter also contains the ID indicating who sent the block Note Make sure that the IDs of the sound...

Page 41: ...lity of the data transmission Name Hex Meaning BCC 01H to FFH XOR checksum 00H Ignore checksum 5 2 5 Block transmission format Block transmission of data is possible with four types as command block as response block as normal response block and as error response block The four instruction format types are described below 1 Command block sent by the computer STX ID ATTR Instruction Parameters ETX ...

Page 42: ...f a character block STX it receives the following data until the block end character CR LF is received When data reception is complete and parity is correct the sound level meter performs follow up checks If the character STX before CR LF is received again the sound level meter ignores all information received so far and starts receiving a block again 2 Validation errors After receiving the data b...

Page 43: ...mentioned error occurs the sound level meter returns a NAK block containing the error code 0003H 5 2 7 Data flow control The sound level meter has a 3 wire serial interface with a 6 pin P S2 socket which lacks the contact pins for hardware data flow control The sound level meter does not support software data flow control Operation in accordance with the requirements of section 5 2 9 Nominal Param...

Page 44: ...pes of instructions Definition statements and query statements Adjustment instructions Define the measurement parameters and system parameters for a sound level meter Query commands Query the parameters and data of the sound level meter There are three situations where instructions are sent to the sound level meter Setting instructions without response setting instructions with response polling in...

Page 45: ...fore measuring the sound level with the sound level meter The measuring microphone is a sensitive component handle it with care Stow the microphone in the supplied box to protect it from external influences Follow the instructions and the user notes Do not drop the appliance avoid shaking and impact Any operation beyond the limits may damage the product Prevent water or other liquids from entering...

Page 46: ...ter cannot print the measured data Check the settings for the printer Check that the print paper is loaded correctly 6 3 Calibration The sound level meter was calibrated before the sale Please calibrate the device regularly to maintain the measuring accuracy BSWA offers a calibration service for acoustic products 6 4 Firmware Update The device SW 1000 SW 2000 can update firmware via the USB connec...

Page 47: ...r friendly Just follow the instructions step by step Start the FlashTool Wizard and select the language Step 1 Prepare the list for the firmware update Step 2 Install the driver Skip this step if you have already installed the driver Step 3 Connect the sound level meter and the computer according to the user s request Note that the sound level meter requires an external power supply If the driver ...

Page 48: ... for the new sound level meters with HWID P0274 and higher The models with the old HWID P0115 do not support a firmware update by the user The following is a list of differences between the old and new types On the About page Model P0115 displays as Type 308 200 while Model P0274 displays as Type 308S 200S The RS 232 connector on the P0115 model is a 3 pin Lemo socket and on the P0274 model a 6 pi...

Page 49: ...0 1 8414 0 0 2 15849 0 7 251 19 0 2 1333 5 0 0 2 511 9 0 2 4731 5 1 0 8912 5 0 1 16788 0 4 316 23 0 0 1412 5 0 0 2660 7 0 1 5011 9 0 7 9440 6 0 3 17783 0 3 398 11 0 0 1496 2 0 1 2818 4 1 0 5308 8 0 9 10000 0 2 18836 0 3 501 19 0 0 1584 9 0 1 2985 4 0 2 5623 4 0 3 10593 1 0 19953 0 4 Extended uncertainties U 0 17 k 2 at 4 kHz U 0 29 k 2 at 4 kHz Note The frequency marked with is not prescribed in t...

Page 50: ...9 6200 6 0 33 125 89 0 03 1000 0 0 14 7943 3 0 66 158 49 0 02 1258 9 0 24 10000 0 71 199 53 0 03 1584 9 0 30 12589 1 04 251 19 0 02 1995 3 0 37 15849 1 37 316 23 0 01 2511 9 0 41 19953 1 92 Extended uncertainties U 0 15 k 2 at 4 kHz U 0 21 k 2 at 4 kHz dB Hz 2 0 1 5 1 0 0 5 0 0 0 5 1 0 50 1187 63 0957 79 4328 100 000 125 893 158 489 199 526 251 189 316 228 398 107 501 187 630 957 794 328 1 00000k ...

Page 51: ... 0 678 10000 4 488 355 0 013 1120 0 116 3550 0 832 11200 5 264 400 0 017 1250 0 140 4000 1 020 12500 6 081 450 0 022 1400 0 170 4500 1 245 14000 6 960 500 0 027 1600 0 213 5000 1 488 16000 7 956 560 0 034 1800 0 260 5600 1 798 18000 8 664 20000 9 272 Extended uncertainties U 0 19 k 2 at 4 kHz U 0 34 k 2 at 4 kHz to 10 kHz U 0 39 k 2 at 10 kHz 0 0 5 0 10 0 50 00 63 00 80 00 100 00 125 00 160 00 200...

Page 52: ... of the sound level meter in the free field The calibration certificate also contains the test results of the frequency response with A C and Z weighting The following table shows the influence of the upper limit of the measuring range with A B and C weighting and a typical frequency response as shown in the figure Freq Hz 31 5 63 125 250 500 1 k 2 k 4 k 8 k 16 k A weighting dB 39 5 26 2 16 2 8 7 ...

Page 53: ...ional standard that has already been withdrawn Only some old devices have the D weighting No frequency weighting i e a so called flat characteristic curve is always referred to as Z weighting flat or linear characteristic curve Time weighting1 Exponential function of time of a certain time constant which weights the square of a sound pressure signal The weighting of the sound pressure is higher if...

Page 54: ...oise exposure Time integral of the square of a frequency weighted sound pressure signal for a defined time interval or an event of defined duration This value is always used to evaluate the noise impact on humans SEL1 Noise exposure The 10 fold logarithm to base 10 of the ratio of a noise exposure to a reference value Sometimes referred to as single event level LN Statistical analysis result The n...

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