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B&K-2236 User Manual - Campbell Associates

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1. 0 5 0 6 0 7 0 8 0 9 1 1 5 2 f fm 932123 1e Fig 6 3 octave filter characteristics as a function of frequency f against centre fre quency fm detail of Fig 6 2 IEC tolerances are shown as dashed lines BB0909 13 Precision Integrating Sound Level Meter Type 2236 6 3 User Manual Chapter 6 Specifications Specifications Frequency Weighting Selected independently for RMS and Peak RMS A C according to BS5969 Type 1 L As shown in Fig 6 1 with Type 1 tolerances Peak C according to BS5969 Type 1 L As shown in Fig 6 1 with Type 1 tolerances Filter Band pass Filters Nine 1 octave filters at 1 1 octave intervals base 10 Centre Frequencies 31 5 63 125 250 500Hz 1 2 4 8kHz Characteristics As shown in Figs 6 2 and 6 3 Detectors Simultaneous RMS and Peak with independent frequency weightings Linearity Range 80dB Pulse Range 83dB Non linear Distortion Too small to affect accu racy Peak Detector Rise Time Typically 50us Time Weighting S F I according to BS5969 Type 1 typically better than Type 0 See Fig 6 4 When Logging Every 0 15 12 ms indicated on the display by qp Display 4 line LCD showing e Measuring range and quasi analogue bar showing input signal Only available with Types 2236 C 009 and 2236 D 009 when filter selected 20 30 e Battery low pause and overload with hold in dicators Time weight
2. Fig 8 13 Syntax for the DEFault command Baud rate and handshake are not affected BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 13 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer DISp The DISp command message sets the parameter to be shown on the sound level meter s screen The query message shows the current displayed parameter its current level and if the sound level meter is or has been overloaded since the last reset The data fields and their settings are listed in Table 8 7 To Sound Level Meter Parameter e Fig 8 14 Syntax for the DISp command To Sound Level Meter From Sound Level Meter If currently overloaded tif overloaded since last reset 930674 2e Fig 8 15 Syntax for the DISp query message and sound level meter re sponse 8 14 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjeer User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer Field Name Field Setting Comments Parameter command MAXP PEAK SPL MAXL MINL Leq Set to Leg or Lin SEL Set to SEL or IEL LEPd Lepg OVL LN1 LNG LN2 LN 2 LN3 LN 3 Parameter query MAXP response PEAK SPL MAXL MINL Leq Leq Lim Lim SEL IEL LEPd Lepg OVL LN1 LNG LN2 LN 2 LN3 LN 3 Level XXX X dB or 96 Table 8 7 DISp data fields and codes BB0909 13 Precision In
3. BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 19 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the SLM to Change Range without Resetting 3 10 Setting the SLM to Change Range without Resetting The sound level meter always resets when changing the fre quency or time weighting The sound level meter also nor mally resets when changing the measurement range As an option you can set the sound level meter to change measurement range without resetting If you do this and change the range the distributions and Ly parameters are not available N A is shown on the display if an Ly is se lected If the sound level meter is logging when you do this then all Ly values including those already logged will show N A To begin logging Ly values again reset the sound level meter by Pressing 30mm 110 PAUSE 00 00 00 F SPL 58 6 dBA 4 Frequency Wt Parameter o D 9 Param CHANGE RANGE gt with reset Briel amp Kj r E Type 2236 931028e 930727 2e 3 20 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting up Auto Logging 3 11 Note e If an overload has occurred the results are not correct You can however accept them for example if the over load was of relatively short duration If the sound level meter is set to not reset when changing the m
4. STATUS Battery 3 9 V Free log 123h12 Free Records 36 930988 1e Fig 4 2 The sound level meter s status screen Battery With fresh batteries the status screen will show approxi mately 6V When there is about half an hour s operation left when there is approximately 4 V the battery voltage level flashes 3 9 V will flash in the example shown in Fig 4 2 in very cold weather much less than half an hour is left The length of time fresh batteries last depends on the conditions of use temperature use of the back light etc Fresh alkaline batteries in a sound level meter without a filter set Type 2236 A 009 or 2236 B 009 will take over 12hours to wear out Those in a sound level meter with a filter set Type 2236 C 009 or 2236 D 009 will take over 10 hours to wear out Note The battery voltage will normally be higher just after the sound level meter is switched on Therefore always wait a minute or so before checking the battery status The main screen also shows a battery low warning see Fold Out BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 7 User Manual Chapter 4 Measuring Starting a New Measurement Free log The hours and minutes left in the log at the current rate of logging are shown Free Records The number of empty Records left in the memory is also shown 4 8 Starting a New Measurement T 1 Calibrate the sound level me ter as descri
5. To Sound Level Meter Status Rat eL 930664e Fig 8 3 Syntax for the AUTOLog command To Sound Level Meter From Sound Level Meter Status Rate l MEASUREMENTS RESET 9 AUTOLOGGING SP SP Fig 8 4 Syntax for the AUTOLog query message and sound level meter response 8 8 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer AUTOStart The AUTOStart command message sets the auto start time day of the month and status The query message shows the current auto start status The data fields and their settings are listed in Table 8 3 To Sound Level Meter Date Time Status ed Jet Let Fig 8 5 Syntax for the AUTOStart command To Sound Level Meter From Sound Level Meter Date Time Status e Jet Jet _ Fig 8 6 Syntax for the AUTOStart query message and sound level meter 930663 1e response Field Name Field Setting Comments Date DD Up to 1 month ahead Time HH MM SS Status ON OFF Table 8 8 AUTOStart data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 9 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer BATt The BATt query message shows the current voltage level and status of the battery Together with the FREE command it is equivalent to the Status Fast Edit fu
6. User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer To Sound Level Meter w From Sound Level Meter Status TIME WEIGHTING D Fig 8 40 Syntax for the TW query message and sound level meter response Field Name Field Setting Comments Status command S Slow F Fast l Impulse Status query response SLOW FAST IMPULSE Q Appears when AUTOLog Rate is 0 1 Cannot be changed while AUTOLog Rate is 0 1 and autolog ging is active Table 8 20 TW data fields and codes 8 32 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer VErsion The VErsion query message shows the version no and log capacity in bytes of the sound level meter The data fields and their settings are listed in Table 8 21 To Sound Level Meter From Sound Level Meter Software Status Version Status SOFTWARE Memo Status LOGGING MEMORY 930699 1e Fig 8 41 Syntax for the VErsion query message and sound level meter response Field Name Field Setting Comments Version Status 2236 X 009 X A B CorD Software Status N NN VP XXXX Values for N NN and XXXX depend on version number Memory Status 128 KBytes 512 Available with Precision Integrating Sound Level Meters Types 2236 A 009 and 2236 C 009 Up
7. inal calibration signal of 94 104 or 114dB at a range of frequencies For day to day calibration you only need to calibrate at one level at one frequency In order to comply with the standards calibrate the sound level meter with a reference signal of 94dB at 1 kHz Calibration at frequencies other than 1 KHz requires correction for the frequency weighting used see Chapter 6 The sound level meter can correct up to 0 5 dB from the nominal calibration level BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 3 User Manual Chapter 4 Measuring Calibrating Fig 4 1 Fitting Sound Level Calibrator Type 4231 onto the sound level meter Multifunction Acoustic Calibrator Type 4226 is fitted in a similar way see its manual 4 4 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Calibrating To calibrate 1 Fit the calibrator carefully onto the sound level meter and rest the sound level meter on a table or other flat surface Ensure that the calibrator fits snugly on the microphone see Fig 4 1 2 For the multifunction acoustic calibrator set it up to calibrate at 94dB and 1kHz see the calibrator s instruc tion manual 3 Switch on the calibrator The calibrator emits a 1 kHz calibration signal 4 Follow the instructions given in the figure below to cal ibrate to the relevant level for the type of measurements
8. respectively In Pause mode how ever no results or overload indi cations are added to the buffer or the log For more information about logging during pauses see section 5 8 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Continuing a Measurement 4 5 Continuing a Measurement 0 No Settings ox E T Level 4 a Jj Parameter Frequency Wt S C S m 30mm 110 Sil 5 Selva 00 06 00 66 5 dB FISEL Br el amp Kj r E s Type 2236 931684 1e Press 9 PAUSE disappears from the display The clock continues counting the measurement time from the point at which it stopped Results are added to the buffer and if selected the log For more information about log ging during pauses see section BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 4 Measuring Starting a Frequency Analysis 4 6 Starting a Frequency Analysis A frequency analysis is a series of measurements in various frequency bands Each measurement is made as for a normal broad band measurement see section 4 3 9 Edit i Settings oy c 1 gt Level Nio Frequency Wt Parameter F P s 1 110 3ommm Sul Hz 00 06 00 im JU 16655 els Br el amp Kj r E s Type 2236 931684 1e Us
9. Level Distrib Logged Res Overall Res Param ey a Y A Frequency Wt Parameter DEM PRINT Record b no XX PRINT p Overall Results Br el amp Kj r E s Type 2236 only available when Record selected XX last Record in memory 931043 1e 930516 2e BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 23 User Manual Chapter 5 Storing and Transferring Results Interpreting the Log Times The results are transferred to the computer under the name you have chosen from the computer program e If you have used a standard communications program to save the data as a spreadsheet file then you can import the results into a spreadsheet program e g Microsoft Excel e Ifyou are using Br el amp Kj r Reporter software then the data will be displayed in Reporter e If you are using Br el amp Kj r dB2XL then the data will automatically be displayed in Microsoft Excel Errors 5 8 If the results are not transferred check e The baud rates and handshake of the sound level meter and computer If they are not the same for both change the configuration of the computer so that the settings match those for the sound level meter Which port is used on the computer The interface cable between the sound level meter and the computer If none of these steps work consult your local Br el amp Kj r service representative Interpreting the Log
10. results stopping W Q on display 35 eee e eet beer Quasi analogue display Query message overview R Random incidence corrector RANge Range default measurement reset due to change Recall Recording Records LH E 5 5 free recalling results from storing results in Replacing batteries RESet Reset at range change default o eU HOP due to changing measurement range due to changing Peak frequency weighting urere titt rh 3 14 due to changing RMS frequency weighting sirce seis reee bei EG oe REOR 3 12 due to changing time weighting 3 11 Results erasing Logged Overall printing recalling storing transfer to computer RMS frequency weighting reset due to changing S S time weighting Screen contrast BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Index SEL Serial interface Service and repair Setting up computer interface Settings changing checking overview Sound Exposure Level SEL Sound Level Calibrator Type 4231 setting up for calibration with Specifications sss Spreadsheet output format Start measurement automatically 4 13 8 9 Storing Overall Results Switching off on Syntax computer control seseee 8 4 T Tessa wrong date or time Time weighting default
11. unplugging the external power supply Otherwise you risk draining the back up battery The Back up Battery The sound level meter has a back up battery for running the clock and maintaining the memory log and buffer even when the sound level meter is switched off or the main batteries are removed The back up battery is automatically recharged when there are batteries in the sound level meter It is fully charged Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Fitting Batteries after about 10hours Fully charged the back up battery runs the clock and retains the results for about 6months These charge times are typical for a sound level meter at room temperature If the back up battery is flat the date and time will be reset to a factory set date If you find that the date and time are wrong this is probably the reason BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 7 User Manual Chapter 3 Setting Up the SLM for Measurement Switching the SLM On and Off 3 3 Switching the SLM On and Off Switching the Sound Level Meter On Press D The sound level meter tests its memory and then returns to Pause mode with the set up it had when it was last switched off While testing its memory the display shows the version of the sound level meter e g 2236 A 009 The default set up is Frequency weighting RM
12. 17 Press OK twice The sound level meter returns to the main screen You are now ready to start an A weighted measurement of noise with a FAST time weighting Lea Ly and Log will be automatically logged into the sound level meter s log Measuring 18 19 20 21 Select an appropriate measurement range using Level A or W An appropriate measurement range is when the signal remains on the quasi analogue scale at all times and no overload indicated by in the upper right hand corner of the screen occurs Note It is important to select an appropriate measure ment range before starting to measure as if you change the range either the sound level meter will reset or the distributions and Lys will not be available Press F This clears the sound level meter s buffer of results and sets the elapsed time to zero Press 2 The sound level meter starts measuring The timer on the right hand side of the screen starts counting the elapsed measurement time The A weighted SPL is shown at the bottom of the screen After each second the Leg L10 and Loo are transferred to the sound level meter s log Use Parameter A or V to look at the various param eters available The quasi analogue scale always shows the SPL regard less of the selected parameter Note that when a Peak parameter is selected the frequency weighting of the Peak signal is shown Note also that when changing the parameter
13. 2236 i2 Apr 1993 vgn p URMS AU Peak C 50 130 dB Time Tf Leq L10 L90 Pause s 9 Ovi tt U15 11 19 7 73 8 92 0 65 7 715 11 20 78 6 99 1 69 0 P 15 11 24 76 1 96 8 66 5 15 14 25 78 4 92 3 70 6 15 11 267 75 1 101 2 73 7 P O 15 11 287 78 1 93 5 73 9 15 11 30 7 72 8 88 9 68 8 15 11 31 7 72 8 88 9 68 8 15 11 32 7 74 3 91 5 61 6 15 11 33 63 7 79 9 48 8 15 41 34 70 2 88 4 48 2 15 11 35 60 6 77 7 44 4 15 11 36 70 2 88 4 58 2 15 11 377 68 0 87 1 46 8 931175 2e Fig 5 5 Spreadsheet output format results logged every 1s P indicates that there has been a pause during that logging interval see section 5 8 O indicates that there has been an overload OVL during the logging interval BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 13 User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 2236 12 Apr 1993 15 11 19 HO 4 AY 50 130 dB Leq Pause Ovl 73 8 78 6 66 1 P 78 4 75 0 78 1 72 8 P o 74 2 931179 1e Fig 5 6 Spreadsheet output format results logged every 0 1s Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 5 5 3 Level Distribution Contains the following informa tion e The number of pauses Bruel amp Kjaer SLM Type 2236 e
14. B 009 and 2236 D 009 Equivalent to 86400 sets of results for example 24h of 1s logging Microphone Type 4188 Prepolarized Free field 1 2 Condenser Microphone Sensitivity 30dB re 1V Pa 2dB Frequency Range 8Hz to 12 5kHz 2dB Capacitance 12pF Serial Interface Compatible with EIA 574 Compatible with EIA 232 E with 25 pole adaptor Baud Rate 1200 19200 Data Bits 8 Stop Bit 1 Parity None Handshake Hardwire XON XOFF or None Result Output Formats Overall and Logged Results Level and Cumula tive Distribution Heading Long or short Output Format Types Printer Printer 24 char line or Spreadsheet Distribution Resolution 1 or 5 dB DC Output Short circuit protected coaxial socket LEMO se ries 00 Output 50mV dB equivalent to 0 4V Output Resistance 1000 Output Sampled detector output Updated 160 times per second AC Output Short circuit protected coaxial socket LEMO se ries 00 Output 0 5V RMS corresponding to the top of the selected measurement range 2 dB depending on the microphone s sensitivity Output Resistance 1000 Signal Output signal from preamplifier L frequen cy weighting Clock Real time calendar and measurement duration Factory set to CET Warm up Time Less than 5s Effect of Magnetic Field 80A m 1Grsted at 50Hz gives lt 34dB L Calibration Conditions Reference Frequency 1000 Hz Reference SPL 94dB Reference Temperature
15. Hz 931234 1e Fig 6 9 Effect of Protective Cover UA 1236 on the sound level meter s frequency re Sponse BB0909 13 Precision Integrating Sound Level Meter Type 2236 6 9 User Manual Chapter 6 Specifications Ordering Information 6 2 Ordering Information Type 2236A Type 2236B Type 2236C Type 2236 D Precision Integrating Sound Level Meter Precision Integrating Sound Level Meter extended memory Precision Integrating Sound Level Meter with 1 1 octave filter set Precision Integrating Sound Level Meter with 1 1 octave filter Set extended memory Includes the following accessories Type 4188 KE 0323 UA 1236 4xQB 0013 Prepolarized Condenser Micro phone Cartridge Shoulder Bag Protective Cover Four 1 5 V LR6 AA size alkaline cells Optional Accessories Carrying Cases KE 0325 Carrying Case with insert for sound level meter Sound Level Calibrator Type 4231 and Tripod UA 1251 Br el amp Kjaer reserves the right to change specifi cations and accessories without notice Type 4231 Sound Level Calibrator Type 4226 Multifunction Acoustic Calibra tor Type 7694 Reporter Software Type 7692 dB2XL Communication Macro for Microsoft Excel Type 2322 Portable Printer includes con nector cable AO 0532 UA 1251 Tripod UA 0801 Tripod UA 1254 Microphone Holder for tripod UA 0237 Windscreen 90 mm UA 0459 Windscreen 65mm AO 0408 Microphone Extension
16. OR Overall Results LR Logged Results LD Level Distribution CD Cumulative Distribution X Record No X ALL All Records Table 8 16 PRint data fields and codes To stop a print out in progress transmit Control C i e hexadecimal 03 or ASCII ETX PW The PW command message sets the frequency weighting of the Peak signal The query message shows the current fre quency weighting of the Peak signal The data fields and their settings are listed in Table 8 17 8 26 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer To Sound Level Meter Status oof From Sound Level Meter MEASUREMENT RESET 930686 1e Fig 8 32 Syntax for the PW command To Sound Level Meter From Sound Level Meter PEAK WEIGHTING SP Status 930687e Fig 8 33 Syntax for the PW query message and sound level meter response Field Name Field Setting Status command C L Status query response C LIN Table 8 17 PW data fields and codes RANge The RANge command message sets the measurement range The query message shows the current measurement range The data fields and their settings are listed in Table 8 18 BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 27 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer To
17. The percentage of the meas urement time during which SETTINGS the sound level meter was overloaded OVL MaxP Leg 12 Apr 1993 08 35 50 teit Elapcod tiue Borde on e The level distribution i e the Pauses M percentage of the measure Overload 0 0 ment time during which the Mis EN SPL was within a certain dB Leq 84 4 dB range e If there has been an under load the percentage of the measurement time during which the sound level meter was underloaded 90 B5 80 75 70 65 60 55 50 45 40 All values are to one decimal place iQ iO iQ 10 1 WD ID 10 0 1 Level distribution is available with 1 or 5 dB resolution 931164 2e Fig 5 7 Level Distribution output format with a short heading BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 15 User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 5 5 4 Cumulative Distribution Contains the following informa tion Bruel amp Kjaer e The number of pauses SLM Type 2236 e The percentage of the meas SETTINGS urement time during which 45 338 dh the sound level meter was Peak overloaded OVL CUMULATIVE DISTRIBUTION e MaxP 12 Apr 1993 08 35 50 e Le Elapsed t me 00 15 00 z i Pauses o e The cumulative distribution Overload 0 0 i e the percentage of the Hazp ios aB measurement time during Leq 84 4 dB which the SPL was over a certain dB level dB dB e If there has been an
18. Times When logged data is displayed each log is tagged with the time the measurement was taken Sometimes you may pause measurement while logging readings which may cause some confusion when interpreting your log This section gives ex amples that show how to interpret your time readings Assume that the sound level meter is set to log at regular intervals of 10 seconds The times attached to the logged data use the following rules e In the print out the times always refer to the start of a measurement period Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 5 Storing and Transferring Results Recording on a DAT recorder When a pause is activated for example 3 seconds after a measurement period has started the measurement will immediately stop When pause is deactivated the meas urement will continue and ends when a total of 10 sec onds has expired 7 seconds later This is independent of the duration of the pause The measurement period therefore has been broken into two parts with a pause in between see Fig 5 9 Time periods in which a pause has occurred will be marked with a P in the print out For example the meas urement marked 22P in Fig 5 9 12 22P 7 10 10 10 Seconds 25 s Pause 57 07 17 Logging Time Stamps 960554e Fig 5 9 An example of logging times with pause intervals 5 9 Recording on a DAT recorder Recording signals on a
19. a similar principle as Settings see section 1 2 2 except that you press Data instead of Show In addition the sound level meter returns to the BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 7 User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter main screen after you have accepted changes to the selected operation There are four data operations each with its own screen e Print e Store e Recall e Erase Fig 1 3 shows an overview of the data operations 30 Mm 110 PAUSE 00 00 00 F SPL 58 6 dBA ERASE PRINT Qo STORE ic 930791 2e Fig 1 3 An overview of the data operations available via the Data push key 1 8 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter 1 2 4 Memory The sound level meter has three types of memory e Buffer e Log e Memory Buffer Log Contains the set up and all results for the current measure ment i e since the last reset see section 1 2 1 From these the cumulative and level distributions and the Overall Re sults are calculated The buffer is updated once a second Contains the automatically Logged Results see section 5 5 2 e Leg e Lio e Loo measurement time of results if logging period is not 0 1 sec Precision Integrating Sound Level Meter Types 2236 A 009 and C 009 can
20. contain up to 21600 sets of results i e up to 64800 results with their measurement times This is enough to log for example 2months of Leg L10 and Loo values logged every 5 minutes Precision Integrating Sound Level Meter Types 2236 B 009 and D 009 can contain up to 86400 sets of results i e up to 259200 results with their measurement times This is enough to log for example 8months of Lea Lig and Log eq values logged every 5 minutes Memory Contains the Overall Results which you have manually stored in a Record together with the set up Can contain up to 40 Records BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 9 User Manual Chapter 1 Useful Information Practical Hints 1 3 Overall Results consist of e MaxL e Frequency weighting of RMS e MinL signal e MaxP e Frequency weighting of Peak signal La or Lim e Time weighting SEL tor IEL e Measurement range o Lepa e Elapsed measurement time 9 Exposure EUG e Start date and time of meas e Ovl urement Ly default L4 e Number of pauses during e Ly default L0 measurement e Lwa default Loo Note The three Ly values in Overall Results are fixed as the selected Lys when the results were stored You can there fore only see these three Ly values after recalling Overall Results Practical Hints The sound level meter is designed as a self contained unit to meet the requirements given in IEC 651 and
21. current status The data fields and their settings are listed in Table 8 14 To Sound Level Meter Status HANDSHAKE SP 932125 1e Fig 8 25 Syntax for the HAndshake command To Sound Level Meter HANDSHAKE From Sound Level Meter Status HANDSHAKE SP 932124e Fig 8 26 Syntax for the HAndshake query message and sound level meter response Field Name Field Setting Commenis Status command HW Hardwire X XON XOFF NO None Status response HARDWIRE XON XOFF NONE Table 8 14 HAndshake data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 23 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer OFf The OFf command message switches the sound level meter off To switch the sound level meter on send any character to the sound level meter e g Break To Sound Level Meter OFF From Sound Level Meter MEASUREMENTS PAUSED CR SLM OFF 930683e Fig 8 27 Syntax for the OFf command PAuse The PAuse command message puts the sound level meter in Pause mode The pause will take effect on the next even second of the sound level meter s clock Therefore you must wait for one full second before sending the next command to be sure that the pause condition has taken effect To Sound Level Meter From Sound Level Meter MEASUREMENTS PAUSED 930684e Fig 8 28 Syntax for t
22. similar national standards However some of the requirements given in the standards are based on measurements of pure tones under free field conditions Practical measurements under similar conditions require the following extra precautions e Do not stand close to the sound level meter e Do not use a windscreen or protective cover e Using a microphone extension cable increase the dis tance between the microphone and any objects which can cause disturbances Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 1 Useful Information Practical Hints The influence of your presence on the measurement can easily be checked by changing the distance between you and the microphone and observing the change in the measured sound pressure level If your position influences the measurement result then use a microphone extension cable or spatially average your measurements that is measure at different positions and average the results Note that when dealing with pure tones a small change in the position of the micro phone can influence the result just as much as your physical presence Fortunately the combination of free sound field and pure tones is very rare With sound coming from several directions and as you are measuring over a broad frequency band the influence of the sound level meter s housing tripod and user becomes insignificant and the above precautions need not be taken F
23. than 1 min the screen tells you that changing the frequency weighting will erase all previous measurement results from the buffer If you do not want to erase the measurement results press NO Press OK to change the frequency weighting and erase the measurement results Press Frequency Wt A to change the frequency weighting in the opposite direction to Frequency Wt V Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Frequency Weighting Edit o Settings e 95 Level y A Frequency Wt Parameter D C F So y 30 EE 110 X y PAUSE P SPL 00 00 00 58 6 dBA Br el amp Kj r E Type 2236 SO Cr AD PAUSE E SPLE 00 00 00 58 6 dBL Frequency Wt 30 MMM 110 PAUSE Im ejes 00 00 00 58 6 dBC Frequency Wt Without filter set mM 110 PAUSE F SPL 00 00 0 58 6 dBA Frequency Wt 30mm 110 8kHz PAUSE in SIP IL 00 00 00 58 6 dB Frequency Wt Sor a 110 4kHz PAUSE F SPL 00 00 00 58 6 dB Frequency Wt 30mm 110 31 5Hz PAUSE PESER 00 00 0 58 6 dB Frequency Wt 931021 1e 931516 1e See footnote on previous page t See footnote on previous page BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 13 User Manual Chapter 3 Setting Up the SLM for Measurement
24. the SLM to Start Automatically See previous page AUTO START On b day 19 May time 12 00 00 AUTO START On day 19 May timeb12 00 00 AUTO START On day 19 May time 12 00 00 only available if On 930789 1e 4 14 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Changing the Displayed Parameter 4 8 Auto Start only works if the sound level meter is switched off at the set time Then at this time the sound level meter will switch on reset and after a pause of 5 seconds start measuring with the set up it had when it was switched off Once the sound level meter has started measuring with Auto Start you can control it in the normal way Measurement will continue until it is switched off manually or the batteries run out Logging will continue until the memory is full or the batteries run out If the sound level meter is already switched on at the time it has been set to automatically start measuring Auto Start is cancelled and has no effect When the set Auto Start time has passed Auto Start will be switched off when you switch off the sound level meter until then it will appear as though it is set in the Auto Start screen This prevents the sound level meter from repeating an automatic measurement every month Auto Start does not affect your use of the sound level meter while the sound level meter is switched on Therefore
25. the sound level meter by using any of the following printers e Portable Printer Type 2322 e An IBM Proprinter compatible serial printer e Graphics Printer Type 2318 The baud rates see section 5 4 of the sound level meter and the printer must be the same to enable them to communicate without losing or corrupting data Warning When connecting the sound level meter to a print er ensure that both the printer and the sound level meter are switched off Otherwise the instruments could be dam aged Note that this does not apply to Portable Printer Type 2322 since it does not have a power switch To print 1 Connect the printer to the sound level meter via the Serial Interface socket on the base of the sound level meter Use one of the following cables e For Portable Printer Type 2322 use Interface Cable AO 0532 supplied with printer e For serial printers with a 25 pole interface use 9 pole Cable with 25 pole Adaptor AO 1386 e For serial printers with a 9 pole interface use 9 pole Cable with 25 pole Adaptor AO 1386 but remove the adaptor e For IBM Proprinter compatible parallel printers use Interface Module UL0064 e For Graphics Printer Type 2318 use Interface Cable AO 0404 2 The communications settings baud rate and handshake on the sound level meter must match those of the printer Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transfe
26. three available total weightings and the nine available octave filters displayed at the left hand side of the screen under the quasi analogue scale It then re turns to the original frequency weighting of the RMS signal Press F S I three times The time weighting displayed in the bottom left hand corner of the screen changes through the three available weightings Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 2 An Example Measurement Making a Measurement Setting up the Sound Level Meter to Log 14 Press Show The screen shows the default Auto Logging screen see Fig 2 2 You can see that the sound level meter is set up so that it doesn t store Logged Results in its log AUTO LOGGING Off 930990 1 Fig 2 2 The default Auto Logging set up screen 15 Press Edit You can now set up the sound level meter to automatically store Logged Results in its log 16 Press Parameter A The screen changes to the Auto Logging set up screen shown in Fig 2 3 You can see that the sound level meter is set up to automatically store Logged Results Leg L10 and Loo in its log every 1s AUTO LOGGING p to log every 1 s Leq L10 L90 931086 1e Fig 2 8 One of the Auto Logging set up screens BB0909 13 Precision Integrating Sound Level Meter Type 2236 2 5 User Manual Chapter 2 An Example Measurement Making a Measurement
27. to be made 4 1 3 Checking the Calibration Follow the instructions given in section 4 1 2 until the sound level meter asks whether you want to recalibrate or not Press NO twice to return to the main screen For Sound Level Calibrator Type 4231 choose a calibration level of 94dB for diffuse field or 93 8 dB for free field For Multifunction Acoustic Calibrator Type 4226 choose a calibration level of 94dB for both diffuse and free field BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 5 User Manual Chapter 4 Measuring Calibrating 110 00 00 01 F SPL 58 6 dBA CALIBRATION Factor X X dB To calibrate press Edit Edit NO Settings OK Show a Level NILE Frequency Wt Parameter OE Y D 9 ey CALIBRATION Calibr level 994 0 dB CALIBRATION Calibr level 94 0 dB New calibration Factor X X dB Use new factor NO OK 931032 1e 930701 3e 4 6 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Checking the Sound Level Meter 4 2 Checking the Sound Level Meter Before you start a longer series of measurements it is good practice to check the status of the sound level meter s battery log and memory To do this press Edit and OK The sound level meter shows the status screen Press OK to return to the sound level meter s main screen
28. under E load the percentage of the dB measurement time during dB which the sound level meter dB dB dB dB dB Under load All values are to one decimal place was underloaded 4 lt 2 3 9 Q 0 8 7 8 0 Cumulative distribution is avail able with 1 or 5dB resolution 931166 2e Fig 5 8 Cumulative Distribution output format with a short heading 5 16 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 5 5 5 Checking and Changing the Output Formats 300m 110 00 00 01 F SPL 58 6 dBA OUTPUT FORMATS Logged Results short heading printer OUTPUT FORMATS Logged Results short heading printer Edit Settings Show OUTPUT FORMATS Logged Results b short heading printer A Frequency Wt Parameter v Logged Results OUTPUT FORMATS Logged Results short heading printer OUTPUT FORMATS Logged Results short heading b printer Br el amp Kj r E s Type 2236 1dB resolut only available when Logged Results or Cumulative or Level Distribution selected 931042 1e 931091 2e BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 17 User Manual Chapter 5 Storing and Transferring Results Printing 5 6 Printing You can print results directly from
29. useful and are based on a very simple principle see the example in Fig 1 1 There are eleven of them in all Auto Logging Calibration Peak Weighting Date and Time Auto Start Change Range Reset Contrast Percentiles Not available with time weighting T Not available with time weighting BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 3 User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter Previou Previous Setting Parameter y parameter Parameter y e Exposure Time e Interface e Output Formats Checking You can check the first of the sound level meter s Settings by pressing the Show pushkey You can then step through them by pressing Show However the Settings are cyclic and you can step forwards and backwards through them us ing Parameter A and V respectively see Fig 1 1 00 00 00 F SPL 58 6 dBA S AUTO LOGGING to log every 1 s Leq L10 190 AUTO LOGGING Level 2 Ato log b every 1 s Level 9 Y Leq L10 L90 or Parameter or Parameter Next Setting Next parameter 931085 1e Fig 1 1 Principle of checking and changing the sound level meter s Set tings Changing When you reach a Setting you want to change press Edit A cursor appears on the first set up line you can change 1 4 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chap
30. way of changing the set up of a Setting that is pressing Show stepping through to the desired Setting and pressing Edit you can also use two pushkeys together to fast edit a Setting that is go directly to a Setting with the edit cursor If you press Edit and within three seconds the pushkey indicated in Table 1 1 the selected Setting appears with the edit cursor p You can now check and change the set up of the Setting as described earlier in this section When you have finished changing the Setting pressing NO or OK however returns you to the main screen Fast Edit Pushkey Edit Goes to Setting Level A or V Calibration Parameter A or V Disp param Peak MaxP Peak Frequency Weighting Parameter A or V Disp param Ly Percentiles Parameter A or V Disp param Lepa Exposure Time Data Output Formats Change Range with Reset Contrast 9 Auto Start OK Status only via Fast Edit Table 1 1 Fast edit pushkeys and the Settings accessed Where display parameters are shown in parenthesis for example Disp par am Lw then the display must be showing the indicated parameter in this example Ly when the Fast Edit keys are pressed to go to the indicated setting in this example Percen tiles 1 2 3 Data Operations The sound level meter s Data pushkey allows you to print your measurement results data and control the sound level meter s memory It operates on
31. you can set the sound level meter up to start measuring at a particular time and date while measuring without affecting your current measurement results Changing the Displayed Parameter The parameters available are listed in section 1 2 1 The se lected parameter and its level are shown at the bottom of the screen After a reset is shown for the level until after the first second after a Pause This is because the level is not yet available The quasi analogue scale always shows the current RMS input signal level regardless of the selected parameter BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 15 User Manual Chapter 4 Measuring Changing the Displayed Parameter A DC level corresponding to the instantaneous RMS level is emitted from the DC Output socket at the base of the sound level meter for recording on a plotter The signal emitted from the AC Output socket is unaffected by which parameter or frequency weighting is selected It is always the L weighted output from the preamplifier and is for recording noise signals on tape transferring signals to an analyser or listening to the input on headphones Br el amp Kj r 58 Settings i Frequency Wt v 30mm 110 F MaxP Edit Level zr Parameter QJ v 00 00 01 65 6 dBC E Type 2236 931037 1e To step forwards and backwards throug
32. 043 1e 930516 2e 5 20 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transferring Results Transferring Results to a Computer Errors 5 7 If the printer does not print out check e The baud rates and handshake of the sound level meter and printer If they are not the same switch the printer off correct the sound level meter s baud rate and or hand shake see section 5 4 so that they are the same as the printer s and switch the printer on again some printers only check the interface while switching on e The interface cable between the sound level meter and the printer If neither of these steps work consult your local Br el amp Kj r service representative Transferring Results to a Computer You can also control the sound level meter from a computer see section 8 3 Warning When connecting the sound level meter to the computer ensure that both the computer and the sound level meter are switched off Otherwise the instruments could be damaged To transfer 1 Connect the computer to the sound level meter via the Serial Interface socket on the base of the sound level meter using 9 pole Cable with 25 pole Adaptor AO 1386 If the computer has a 9 pole interface socket remove the adaptor 2 Start a communications program e g BK Link Pro Comm or Br el amp Kj r Reporter or Br el amp Kj r dB2XL on the computer If you are using R
33. 10 1 1993 and IEC 1010 1 1990 Safety requirements for electrical equipment for measurement control and laboratory use EMC Emission EN 50081 1 1992 Generic emission standard Part 1 Residential commercial and light industry EN 50081 2 1993 Generic emission standard Part 2 Industrial environment CISPR 22 1993 Radio disturbance characteristics of information technology equipment Class B Limits FCC Rules Part 15 Complies with the limits for a Class B digital device EMC Immunity EN 50082 1 1992 Generic immunity standard Part 1 Residential commercial and light industry RF immunity implies that sound level indications of 45dB or greater will be affected by no more than 0 5dB EN 50082 2 1995 Generic immunity standard Part 2 Industrial environment RF immunity implies that sound level indications of 60dB see note below or greater will be affected by no more than 0 5dB Note RF immunity is 14dB better than the requirements given in IEC 1672 Draft June 1996 Class 1 6 6 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 6 Specifications Specifications Frequency Response Relative response dB 3 f Frequency response satisfies IEC 651 Type 1 10 20 50 100 200 500 1k 2k 5k 10k 20k Frequency Hz 931262 1e Fig 6 5 Typical free field response of Microphone Type 4188 for 0 incidence without random incidence corrector R
34. 20 C 68 F Reference RH 65 Reference Range 50 130 dB set automatically during calibration sequence Reference Direction of Incidence Frontal Calibration Correction with Extension Cable 0dB Environmental Effects Storage Temperature 25 to 70 C 13 to 158 F Operating Temperature 10 to 50 C 14 to 122 F Effect of Temperature 0 5 dB 10 to 50 C Effect of Humidity lt 0 5 dB for 30 lt RH lt 90 at 40 C 1 kHz Vibration Sensitivity lt 80dB with L weighting at 1m s horizontally 85 GB with L weighting at 1m s vertically Batteries Four 1 5 V LR6 AA size alkaline cells Lifetime at room temperature Typically gt 12h for Types 2236A 009 and 2236 B 009 Typically gt 10h for 2236 D 009 Internal back up battery Keeps clock and memories operating for 6months typically if fully charged Types 2236C 009 and External Power Supply Must fulfil the following specifications Voltage regulated or smoothed 7 15V DC Voltage Ripple 100mV peak to peak Maximum Current 400 mA Average Current 100mA at 7V Socket Centre Pin Positive Casing Negative Pin Diameter 2 0mm External Diameter 5 5mm Physical Characteristics Size 257x97x41mm Weight 460g incl batteries BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 6 Specifications Specifications C CE mark indicates compliance with EMC Directive Safety EN 610
35. 31 User Manual Chapter 3 Setting Up the SLM for Measurement 3 7 Setting the Percentiles sss 3 15 3 8 Setting the Exposure Time wu 7 d1 40 3 17 3 9 Setting the Date and Time 3 18 3 10 Setting the SLM to Change Range Without Resetting sss 3 20 3 11 Setting up Auto Logging ee 3 21 3 12 Setting the Viewing Conditions 3 24 3 2 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Mounting the Microphone 3 1 Mounting the Microphone Before mounting the microphone note the following precau tions When screwing in the microphone input stage protection grid and extension cables do it gently to avoid damag ing the threads Do not touch the diaphragm with any object it is very delicate Small amounts of dust on the diaphragm will not affect the microphone response Mounting the Microphone and Input Stage 1 Gently screw Microphone Type 4188 supplied with the sound level meter onto Input Stage ZC 0025 Insert the input stage into the input stage socket and secure by turning the threaded retaining ring see Fig 3 1 Connecting the Microphone Extension Cable 1 Gently screw Microphone Type 4188 supplied with the sound level meter onto Input Stage ZC 0025 Insert the input stage into Microphone Extension Cable AO 0408 3m or AO 0409 10m and se
36. 5 BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 1 User Manual Chapter 4 Measuring Calibrating 4 1 4 1 1 Calibrating Introduction When to Calibrate The standards recommend that you calibrate your sound level meter before each set of measurements see section 4 1 2 and check the calibration after each set see section 4 1 3 Connecting a recommended microphone extension cable has no effect on the sound level meter s calibration Therefore you do not have to recalibrate after connecting one of the recommended microphone extension cables Principle of Calibration The sound level meter uses a calibration factor to check for drift This is shown on the Calibration screen When calibrat ing the sound level meter first checks the calibration signal against the calibration level you set The sound level meter shows you the factor required for correct calibration and asks if you want to recalibrate If you press OK the sound level meter calibrates itself according to this new calibration level i e it adjusts itself to the calibration level you entered During this procedure the sound level meter is automatically set to use the reference measurement range and to show SPL on the display The frequency and time weighting settings are not changed Therefore calibration at frequencies other than 1kHz requires correction for the frequency weighting used see Fig 6 1 Calibrating for Free Field or D
37. 60 140 143 123 Only available with Types 2236 C 009 and 2236 D 009 when filter selected T For linearity range specifications see the table given under Noise Floor Relative Response At 40 C and 95 RH add 2dB to typical values and 3dB to maximum values Includes preamplifier s electrical noise and micro phone s thermal noise Parameters MaxL MinL MaxP Peak SPL Leg Lim SEL JEL LEPa Ly 3 values with Loo L49 and L4 as default and Overload in of measurement time Resolution Ly Values 0 5 dB Other Parameters 0 1 dB dB 2 5 10 20 50 100 200 500 ik 2k 5k 10k 20k 50k Frequency Hz 930733 1e Fig 6 1 Nominal frequency weighting characteristics Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 6 Specifications Specifications Relative response dB 10 0 10 20 30 40 4 50 60 70 M r 80 0 05 0 125 0 25 0 5 1 2 34 810 20 30 50 f fm 932122 1e Fig 6 2 octave filter characteristics as a function of frequency f against centre fre quency fn IEC tolerances are shown as dashed lines Relative response dB 1
38. Cable 3m AO 0409 Microphone Extension Cable 10m AO 0403 LEMO to BNC Cable AO 1386 9 pole Cable with 25 pole Adap tor for computer and serial printer UL 0064 Interface Module ZG 0386 Power Supply for Europe ZG 0387 Power Supply for UK ZG 0388 Power Supply for USA Upgrades ZT0326 Octave Filter Set 6 10 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 7 Service and Repair BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 7 Service and Repair Precision Integrating Sound Level Meter Type 2236 is de signed and constructed to provide many years of reliable operation However if a fault occurs which impairs the sound level meter s correct function then remove its main batteries and disconnect any external power supply to prevent risk of further damage For repair contact your local Br el amp Kjzer service represent ative Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 8 Appendices BI D adde D 8 2 2 pr 8 3 8 3 Controlling the Sound Level Meter from a Computer sss 8 4 Introduction i4 eene ri eet tenen a 8 4 Commands iet e Gab RE Carte e Sab EROR es 8 6 BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 1 User Manual Chapter 8 Appendices SEL 8 1 SEL SEL the Sound Exposure Level is the constant sound le
39. DAT recorder The DAT recorder If neither of these steps works consult your local Briiel amp Kj r service representative Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 6 Specifications OL Specifications n uososdscedstattiws obses tia vate dus 6 2 6 2 Ordering Information 2 see 6 10 BB0909 13 Precision Integrating Sound Level Meter Type 2236 6 1 User Manual Chapter 6 Specifications Specifications 6 1 Specifications Standards Conforms with IEC 651 1979 and IEC 804 1985 Type 1 and IEC 1672 Draft June 1996 Class 1 Conforms with ANSI S1 4 1983 and Draft 51 43 6th September 1992 Type 11 Conforms with BS 5969 and BS 6698 Type 11 1 1 octave filter set conforms with IEC 1260 1995 Class 1 ANSI S1 11 86 order 3 Type 1 D and BS 2475 1964 Types 2236 C and 2236 D only Measuring Ranges Noise Floor Under reference conditions Frequency Weighting A C Lin Typical Noise Floor 17 18 23 Max Noise Floor 20 20 26 Level at which noise 30 30 36 floor causes a non lin earity of 0 4 dB Level at which noise 26 26 32 floor causes a non lin earity of lt 1dB Range Max Upper limit RMS for dB Peak signals with crest level factor 10 20dB 10 90 93 73 201 100 103 83 30 110 113 93 40 120 123 103 50 130 133 113
40. DAT recorder via the sound level meter is useful for getting a calibrated recording for full analysis of impulsive noise or for examining the noise for pure tones Also later on you can listen to the signal in order to be able to identify certain events such as a barking dog or slamming door To record 1 Connect the DAT recorder to the sound level meter via the AC Out socket on the base of the sound level meter using LEMO to BNC Cable A00403 An adaptor may be required for the input sockets of certain DAT recorders 2 Set the maximum input of the DAT recorder to at least 500MV ims BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 25 User Manual Chapter 5 Storing and Transferring Results Recording on a DAT recorder 7 8 Set the sound level meter to a suitable range one that covers the sound levels and does not cause overloads It is important to do this to ensure that you know what range the recorded signal represents Start recording Record the calibration signal from the calibrator This will allow you to accurately adjust the sensitivity of the analysis equipment on playback Measure After measuring record the calibration signal again Stop recording and switch the sound level meter off For more information on recording using a DAT recorder see the recorder s manual Errors If the DAT recorder does not record check The cable between the sound level meter and the
41. EPd meas 7 gt 30 hh mm EXPOSURE TIME LEPd meas 7 gt 30 hh mm Briel amp Kj r Type 2236 24 only available if mm 00 t i j Z 831 026 16 00 not available if hh 00 Sd10BBPS Note Changing the Exposure Time does not reset the sound level meter Therefore you can investigate the effect of dif ferent Exposure Times on the Lgp after a measurement BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 17 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Date and Time 3 9 Setting the Date and Time The sound level meter s clock operates even when the sound level meter is switched off if the internal back up battery is charged up see section 3 2 3 It is factory set to Central European Time CET 308 110 PAUSE 00 00 00 F SPL 58 6 dBA DATE TIME 31 MAR 1993 09 30 00 Edit DATE TIME Settings gt 31 MAR 1993 09 30 00 Show DATE TIME 31PMAR 1993 09 30 00 DATE TIME gt 31 MAR 1993 09 30 00 931027 1e See next page 930726 2e 3 18 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Date and Time See previous page DATE TIME 31 MARP1993 09 30 00 DATE TIME 31 MAR 1993 09 30 00 DATE TIME 31 MAR 1993 09 30 00 DATE TIME 31 MAR 1993 09 30 00 930700 1e
42. NG POLE NO Settings Show Parameter v AUTO LOGGING to log b every 1s AUTO LOGGING Leq L10 L90 to log every 1s Leq L10 L90 Br el amp Kj r E Type 2236 Og JE only available if not Off 9310892 If you change the range or the frequency or time weighting while the sound level meter is set to log results in the sound level meter s memory the sound level meter stops logging and auto logging is set to off This is because the measure ment set up information in the log would no longer be rele vant for further logged results 3 22 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting up Auto Logging If you change the auto logging status to log to the sound level meter s memory the sound level meter will after a warning erase any previously logged results Results are not logged while the sound level meter is in Pause mode For more information about logging during pauses see section 5 8 Pressing does not erase the log To erase the log see section 5 3 BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 23 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Viewing Conditions 3 12 Setting the Viewing Conditions The sound level meter s screen can be changed to cope with various lighting temperatures conditions and viewin
43. Precision Integrating Sound Level Meter Type 2236 A 009 Type 2236 B 009 Type 2236 C 009 Type 2236 D 009 With software version 2 1 or higher Revision November 1996 Br el amp Kj r BB0909 13 Trademarks IBM is a registered trademark of International Business Machines Inc USA Copyright 1993 1996 Briiel amp Kj r Sound amp Vibration Measurement A S All rights reserved No part of this publication may be reproduced or distributed in any form or by any means without prior consent in writing from Br el amp Kj r Sound amp Vibration Measurment A S Narum Denmark 0 2 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Contents Useful Information Describes the sound level meter and its general operating principles An Example Measurement A familiarization guide which explains step by step a typical measurement Setting Up the SLM for Measurement How to prepare the sound level meter for measuring Measuring How to calibrate and measure with the sound level meter Storing and Transferring Results What you are able to do with your results Specifications The specifications and information regarding other equipment available for use with the sound level meter Service and Repair Service and repair of the sound level meter Appendices Explains specific terminology used in the manual and contains instructions on how t
44. S A Frequency weighting Peak C Time weighting F Displayed parameter SPL Displayed range 30 110dB Output formats Overall Results Short Heading Logged Results Short Heading Printer Level Distribution Short Heading 5dB resolution Cumulative Distribution Short Heading 5dB resolution Lyi Li Lye Lio Lys Loo Auto logging Off Exposure Time 7 30 hours Reset at range change On Auto start Off Note e To switch the sound level meter on in the default set up press and hold and then press D for about 1s The Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Measurement Range sound level meter erases all results and returns to the default set up in Pause mode Note that this procedure will reset your calibration You must therefore recalibrate your instrument as described in section 4 1 after reset ting We recommend that you do not reset the instrument in this way if you are using an accredited calibration e To erase all results in the log memory and buffer press and Data Switching the Sound Level Meter Off 3 4 Press D The sound level meter goes into Pause mode and switches off No measurement data from the buffer log and memory are lost Setting the Measurement Range The measurement range is shown to the left and right of the quasi analogue scale Sound level meters without filter
45. SPL since the last reset e MaxP maximum Peak level since the last reset Peak maximum Peak level in 1s interval e SPL maximum RMS level in 1s interval according to IEC 651 Leg equivalent continuous sound level Leq according to TEC 804 LIm equivalent continuous impulse sound level if time weighting is I Lj according to IEC 804 Appendix B e SEL Sound Exposure Level if A weighted then Lpa according to IEC 804 e IEL Impulse Sound Exposure Level if time weighting is D 1 2 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter e LEPd Daily Personal Noise Exposure Level see section 8 2 e LN 3 default Logo RMS level exceeded Ng of the meas urement time Lyg e LN 2 default Ljy RMS level exceeded No of the meas urement time Ly e LN 1 default L4 RMS level exceeded N of the meas urement time Ly e OVL Input signal overloading instrument of the meas urement time In addition Precision Integrating Sound Level Meter Types 2236 C 009 and 2236 D 009 contain 1 1 octave filter sets between 31 5Hz and 8kHz which comply with BS 2475 1964 They can measure all the above mentioned parame ters in each of the filter bands 1 2 2 Settings Checking and Changing the Settings The sound level meter s Settings are additional to the basic measurement set up They are very
46. Setting the Frequency Weighting 3 6 3 Setting the Peak Frequency Weighting The available frequency weightings of the Peak signal are shown below C for measuring the damaging effects of noise in accordance with the EU directive on exposure to noise at work L for special applications Edit 30 MMM 110 PAUSE 00 00 00 F MaxP dBC Settings Show A Parameter v PEAK WEIGHTING PEAK WEIGHTING O gt C Param 930724 2e mC Br el amp Kj r E s Type 2236 931022e f there are more than 1min of measurement results in the buffer i e the elapsed time shown is greater than 1 min the screen tells you that changing the frequency weighting will erase all previous measurement results from the buffer If you do not want to erase the measurement results press NO Press OK to change the frequency weighting and erase the measurement results 3 14 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjeer User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Percentiles 3 7 Setting the Percentiles Three Ly parameters percentile levels are transferred over the interface to a printer or computer see sections 5 6 and 5 7 with Overall Results You can choose three percentiles or use the default percentiles L4 Lj and Log The selected percentiles can also be displayed one after another on the display see se
47. Sound Level Meter Status of Fig 8 384 Syntax for the RANge command To Sound Level Meter From Sound Level Meter CDO Status 930691e Fig 8 35 Syntax for the RANge query message and sound level meter response Field Name Field Setting Commenis Status command 90 10 90 100 20 100 110 30 110 120 40 120 130 50 130 140 60 140 Status query response 10 90 20 100 30 110 40 120 50 130 60 140 Only available with sound level meters with filter sets Types 2236 C 009 and 2236 D 009 when RMS Frequency Weighting is 31 5Hz 8kHz Table 8 18 RANge data fields and codes 8 28 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer RESet The RESet command message resets the sound level meter Note There is no reset warning To Sound Level Meter From Sound Level Meter MEASUREMENT RESET 930693e Fig 8 36 Syntax for the RESet command SETup The SETup query message shows the sound level meter s current set up The data fields and their settings are listed in Table 8 19 To Sound Level Meter From Sound Level Meter Parameter Status MEASUREMENT SET UP c8 C HA 930694 1e Fig 8 37 Syntax for the SETup query message and sound level meter re sponse BB0909 13 Precision Integrating Sound L
48. Wt Parameter T y 3 L Data RECORD NO 1 RECALL Record gt no XX G A RECORD NO 1 00 20 00 F MaxL 103 2 dBA 00 20 00 F MaxL 103 2 dBA Br el amp Kj r eo Type 2236 XX Last Record in memory 931039 1e 930511 4e 5 4 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 5 Storing and Transferring Results Erasing Results 5 3 Erasing Results You can erase results from a single record all records that is the entire memory or the log 30mm 110 PAUSE 00 00 00 F SPL 58 6 dBA ERASE Record no XX Edit NO Settings OK 3 Frequency Wt Parameter SG ERASE bRecord nope A ERASE Record b no XX Br el amp Kj r E d Type 2236 only available when Record selected 931040 1e XX last Record in memory 930512 3e BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 5 User Manual Chapter 5 Storing and Transferring Results Setting up the Interface 5 4 Setting up the Interface The interfaces of the sound level meter and the instrument for example a printer or computer it is connected to via the Serial Interface socket must have the same set up to enable them to communicate without losing or corrupting data Both the handshake and the baud rate of the sound level meter s interface can be set The following types of hand
49. a fields and codes FW The FW command message sets the frequency weighting of the RMS signal The query message shows the current fre quency weighting of the RMS signal The data fields and their settings are listed in Table 8 12 To Sound Level Meter Status oof From Sound Level Meter MEASUREMENT RESET 930681 1e Fig 8 28 Syntax for the FW command BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 21 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer To Sound Level Meter Mm From Sound Level Meter FREQUENCY WEIGHTING SP Status 930682e Fig 8 24 Syntax for the FW query message and sound level meter response Field Name Field Setting Comments Status command A C L 31 63 12 25 50 1K 2K 4K 8K 31 5Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz Status response A C L 31 5 HZ 63 HZ 125 HZ 250 HZ 500 HZ 1 KHZ 2 KHZ 4 KHZ 8 KHZ Only available with sound level meters with filter sets Types 2236 C 009 and 2236 D 009 Table 8 13 FW data fields and codes Precision Integrating Sound Level Meter Type 2236 User Manual Br el amp Kjaer Chapter 8 Appendices Controlling the Sound Level Meter from a Computer HAndshake The HAndshake command message sets the form of data exchange over the interface The query message shows the
50. alibrator emits the 1 kHz calibration signal 8 Press OK Sound Level Calibrator Type 4231 provides a nominal calibration signal of 94dB at 1 kHz However each calibrator is slightly different It is therefore important to set the calibration level to the one given on the calibration chart for the calibrator used BB0909 13 Precision Integrating Sound Level Meter Type 2236 2 3 User Manual Chapter 2 An Example Measurement Making a Measurement 10 The sound level meter checks the calibration signal against the calibration level you set in step 5 It then asks if you want to calibrate according to the expected level Press OK The sound level meter calibrates itself according to the calibration level you set in step 5 and returns to the Calibration screen which now shows the new calibration factor Press OK The sound level meter returns to the main screen Checking the Weightings 11 12 13 With sound level meters without filter sets Types 2236 A 009 and 2236 B 009 press Frequency Wt three times The frequency weighting of the RMS signal displayed in the bottom right hand corner of the screen changes through the three available weightings With sound level meters with filter sets Types 2236 C 009 and 2236 D 009 press Frequency Wt twelve times The frequency weighting of the RMS signal displayed in the bottom right hand corner of the screen changes through the
51. bed in section 4 1 2 Select a suitable measure ment range This reduces the risk of you having to change the range during a measurement in or der to avoid Overloads Over loads reduce the validity of your results and changing the measurement range may cause a reset 3 Press 3 00 00 01 F SPL 46 5 dBA Br el amp Kj r a Type 2236 931033 1e If there are more than 1min of measurement results in the sound level meter s buffer i e the elapsed time shown on the screen is greater than 1min the screen tells you Up to a maximum of 255h59 T If you are only interested in instantaneous parameters e g Peak or SPL you can miss out steps 3 and 5 4 8 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Starting a New Measurement that resetting will erase all previous measurement re sults from the buffer If this occurs press OK to confirm that you want to reset the sound level meter The results in the sound level meter s display buffer are erased and the elapsed time is set to zero The overload hold is reset so that the sound level meter indicates that there have not been any overloads since the last reset Note To erase all results in the Log Memory and display buffer press and Data If you want to measure according to IEC standards i e free field simply point the sound level meter towards the sound source If y
52. ction 4 8 N can have values of between 1 and 99 in integer 1 steps Note e Changing the percentiles does not reset the sound level meter Therefore you can view any percentile levels dur ing or after a measurement e The sound level meter always logs Lig and Loo in Logged Results regardless of the percentiles you have selected BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 15 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Percentiles 110 00 00 01 F L50 46 5 dBA PERCENTILES 1 L1 2 L10 3 L90 PERCENTILES gt 1 L1 2 L10 3 L90 Q Edit NO Settings Show PERCENTILES 1 L1 E2 L10 3 L90 Frequency Wt Parameter w i 2 oa PERCENTILES gt 1 L1 Ge GEO 324590 PERCENTILES O Lid 2 110 z Param 3 190 931202 1e 931087 2e 3 16 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Exposure Time 3 8 Setting the Exposure Time Exposure Time is used in the calculation of Lgpq see section 8 2 It can have values of between 1min and 24hours E 00 00 01 F LEPd 46 5 dBA EXPOSURE TIME LEPd meas 7 30 hh mm D Edit Settings EXPOSURE TIME LEPd meas Show gt 7 30 hh mm A Frequency Wt Parameter v EXPOSURE TIME L
53. cure by turning the threaded retaining ring Insert the other end of the microphone extension cable into the input stage socket and secure by turning the threaded retaining ring see Fig 3 2 Note Connecting a recommended microphone extension ca ble has no effect on the sound level meter s calibration There fore you do not have to recalibrate after connecting one of the recommended microphone extension cables BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 3 User Manual Chapter 3 Setting Up the SLM for Measurement Fitting Batteries Fig 3 1 3 2 Mounting the input stage and microphone onto the sound level meter Fitting Batteries Important Before removing batteries or disconnecting a power supply from the sound level meter make sure the instrument is switched off from the front panel by pressing D You risk draining the back up battery if you remove the batteries while the sound level meter is switched on Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 3 Setting Up the SLM for Measurement Fitting Batteries Fig 3 2 Connecting a microphone extension cable to the sound level meter 3 2 1 Replacing Batteries 1 Make sure the sound level meter is switched off by press ing D 2 Press the two tabs on the upper edge of the battery compartment and remove the lid 3 Replace the old batteries with new ones f
54. e Print Set up screen appears see Fig 2 5 PRINT Overall Results 930997 1e Fig 2 5 The default Print Set up screen 38 Press OK The printer prints the Overall Results see section 1 2 4 together with a short heading containing the measure ment set up the frequency weightings of the RMS and Peak signals the time weighting and the measurement range After transferring the results to the printer the sound level meter displays the main screen BB0909 13 Precision Integrating Sound Level Meter Type 2236 2 9 User Manual Precision Integrating Sound Level Meter Type 2236 User Manual Briel amp Kj r Chapter 3 Setting Up the SLM for Measurement 3 1 Mounting the Microphone 77 1s 3 3 a2 Fitting Batteries o Boo TO E 3 4 Replacing Batteries ccccssssccccccsssssssceeeeceesssssseeeeeees 3 5 Using an External Power Supply 3 6 The Back up Battery orrnnorrrrrrrrornrnnnnrrvvnrrrnrnnnnnnrvnnnrrenrr 3 6 3 3 Switching the SLM On and Off 3 8 3 4 Setting the Measurement Range 3 9 3 5 Setting the Time Weighting 2 3 11 3 6 Setting the Frequency Weighting 3 12 Introduction si eee nere eere ee 3 12 Setting the RMS Frequency Weighting 3 12 Setting the Peak Frequency Weighting 3 14 BB0909 13 Precision Integrating Sound Level Meter Type 2236
55. eadsheet program F Long heading F time weighting Fast edit M Fast time weighting Measurement o aiies n 2 6 Filter continue characteristics elapsed time 8 16 Fitting batteries example 2 2 FOrmat PAUSE dues KO EXON 8 24 Index 2 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Index range standards re start automatically Memory capacity left Microphone extension cable mounting response Mounting the microphone Multifunction Acoustic Calibrator Type 4296 setting up for calibration with 4 3 N Nominal calibration level None handshake o Octave filter Ordering information Output AC Output socket DC Output socket Output Formats Output formats checking and changing Cumulative Distribution default Level Distribution Printer b Printer 24 char line 5 11 5 12 5 19 Spreadsheet Overall Results erasing printing recalling storing Overload indication via interface P Parameters available changing the displayed 15 8 14 PAG remet D 8 24 Pause 8 24 Effect on log times sss 5 24 Peak frequency weighting reset due to changing PErcentile Percentiles default Power supply external Practical hints Printer output format Printing Overall Results
56. easurement range you will be unable to see from the Overall Results at which measurement range the overloads took place You can however see when they took place in the Logged Results see sections 5 6 and 5 7 for how to view them e The sound level meter takes 6 ms to change measurement range If you change range when the sound pressure level is near its maximum and the sound level meter is set to not reset when changing the measurement range you will reduce the accuracy of the measurement Setting up Auto Logging You can set the sound level meter to automatically log e Leg e Lio Ly e measurement time of results and store them at regular intervals in its log or send them via the Serial Interface to a PC The logging time i e the time between each set of results can be one of the following e Ols e 5min e ils e 10min e 10s e 15min e 30s e 30min e Imin e 1hour Only Leg is logged The sound level meter sets the time weighting to 12 ms shown on the display by qp You cannot change the time weighting When the logging time is reset to any other value or the autologging is switched off the time weighting is restored to its previous setting BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 21 User Manual Chapter 3 Setting Up the SLM for Measurement Setting up Auto Logging 30 MMM 110 PAUSE 00 00 00 F SPL 58 6 dBA AUTO LOGGING Off Edit AUTO LOGGI
57. elative response dB i Frequency response satisfies ANSI S 1 471984 Type 1 10 20 50 100 200 500 1k 2k 5k 10k 20k Frequency Hz 931263 1e Fig 6 6 Typical diffuse field response of Microphone Type 4188 with random incidence corrector BB0909 13 Precision Integrating Sound Level Meter Type 2236 6 7 User Manual Chapter 6 Specifications Specifications Directional Characteristics S NS x Su SN yon BU DN I 931238 1e Fig 6 7 Directional characteristics of the complete instrument at 1 2 4 8 12 5 kHz 6 8 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjeer User Manual Chapter 6 Specifications Specifications Effect of Accessories a Relative Response dB 100 200 500 1k 2k 5k 10k 20k Frequency Hz 931236 1e b Relative Response dB 1 100 200 500 1k 2k 5k 10k 20k Frequency Hz 931235 1e Fig 6 8 a Effect of the sound level meter s casing on its frequency response for refer ence compared to b the effect of Tripod UA0801 on the sound level meter s frequency response 1 Relative Response dB 100 200 500 1k 2k 5k 10k 20k Frequency
58. ement Switching On 1 Press QD The sound level meter switches on After a self test the sound level meter is set up in Pause mode in the default set up The quasi analogue scale shows the input signal to the preamplifier and displayed parameter shows the current SPL The buffer log and memory are empty Since the displayed parameter SPL is an RMS param eter you can see the frequency weighting of the RMS signal shown in the bottom right hand corner of the screen See the fold out back cover for more details of the main screen Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 2 An Example Measurement Making a Measurement Calibrating the Sound Level Meter 2 Press Show The screen shows the default Auto Logging screen 3 Press Parameter A The screen changes to the Calibration screen It shows the current calibration factor 4 Press Edit The screen shows the calibration set up see Fig 2 1 CALIBRATION Calibr level gt 94 0 dB 930989 1e Fig 2 1 The calibration set up screen 5 Read the correct calibration level from the calibrator s calibration chart and use Parameter A and V to set the sound level meter to this level 6 Fit the calibrator onto the sound level meter and rest the sound level meter on a table or other flat surface Ensure that the calibrator fits snugly on the microphone 7 Switch on the calibrator The c
59. eporter or dB2XL then please refer to your Reporter or dB2XL documenta tion for more information BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 21 User Manual Chapter 5 Storing and Transferring Results Transferring Results to a Computer 3 Configure the computer as follows 9600 Baud 8 data bits 1 stop bit Parity none Handshake XON XOFF 4 Onthe computer enter the name of the file to which you want the results to be transferred see the instruction manual for the communications program 5 Set the sound level meter s baud rate to 9600 and its handshake to XON XOFF see section 5 4 The baud rates and handshake of the sound level meter and the computer must be the same to enable them to communicate without losing or corrupting data 6 Set up the Output Format of the results you want to transfer see section 5 5 If you are using Reporter or dB2XL or will be using the Logged Results in a spread sheet program select the Spreadsheet format 7 Set the sound level meter in Pause mode and follow the instructions given in the figure below 5 22 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 5 Storing and Transferring Results Transferring Results to a Computer 30m 110 PAUSE 00 20 00 F SPL 58 6 dBA PRINT Overall Results Edit NO Settings All Records BRENT Record bOverall Results Cum Distrib
60. er type of printer P indicates that there has been a pause during that logging interval see section 5 8 O indicates that there has been an overload OVL during the logging interval amp indicates that there has been both a pause and an over load OVL during the logging interval Printer 24 character line output format when results have been logged every 0 1s is the same as the Printer output format see Fig 5 3 BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 11 User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats Bruel amp Kjaer SLM Type 2236 SETTINGS 50 139 dB Peak C RESULTS 15 11 19 L10 L90 hhmnss GB dB 151119 82 0 65 7 151420 89 1 69 0 151124P 86 8 66 5 151125 92 3 72 6 1511260 91 2 73 7 151128 amp 93 5 73 9 151129 93 0 73 3 151130 93 0 73 3 151131 88 9 68 8 151132 91 5 71 6 151133 79 9 58 8 151134 83 8 63 1 151135 77 7 54 4 151136 88 4 68 2 151137 87 1 66 8 9371172 18 Fig 5 4 Printer 24 character line output format with short heading results logged every 1s Precision Integrating Sound Level Meter Type 2236 User Manual Briel amp Kj r Chapter 5 Storing and Transferring Results Setting up the Output Formats Spreadsheet A comma delimited format i e all text is in inverted commas and data are separated by commas for use with spread sheet programs e g Excel
61. ery Message Command Query AUTOLog FW AUTOStart HAndshake BATt OFf e BAUd PAuse CLock PErcentile CONtinue PRint DEFault PW e e DISp RANge e ELapsed RESet ERASE SETup e EXPosure STOre FOrmat TW e e FREE VErsion Table 8 1 Command and query message overview 8 6 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer AUTOLog The AUTOLog command message sets the destination of the data and rate of logging The query message shows the cur rent status When logging data over the interface the sound level meter cannot be controlled from the computer except to change the status of the auto logging Changing the rate of logging data resets the sound level meter The data fields and their settings are listed in Table 8 1 Field Name Field Setting Commenis Status command l To interface L To internal log O Off Rate 0 1 0 1s Leq only 1s 10s 30s 1m 1minute 5m 10m 15m 30m 1h 1hour Status response INTERFACE LOG OFF Causes TW Status to be set to Q TW Status cannot be changed while AUTOLog Rate is 0 1 and Status is not Off Table 8 2 AUTOLog data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 7 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer
62. evel Meter Type 2236 8 29 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer Field Name Field Setting Comments Parameter FREQUENCY WEIGHTING PEAK WEIGHTING TIME WEIGHTING DISPLAYED PARAMETER RANGE CHANGE RANGE PERCENTILE LEVELS AUTO LOGGING AUTO LOGGING RATE EXPOSURE TIME AUTO START Frequency weighting RMS Frequency weighting Peak Status A C L XXX HZ C L FAST SLOW MPULSE Q 5ms XXX XX XXX dB WITH WITHOUT RESET LN1 LN2 LN3 ON OFF XX HH MM ON OFF See Table 8 12 Displayed Parameter See Table 8 1 Only available with sound level meters with filter sets Types 2236 C 009 and 2236 D 009 Table 8 19 SETup data fields and codes Precision Integrating Sound Level Meter Type 2236 User Manual Briel amp Kj r Chapter 8 Appendices Controlling the Sound Level Meter from a Computer STOre The STOre command message saves the overall results to the next available record To Sound Level Meter 960400e Fig 8 38 Syntax for the STOre command TW The TW command message sets the time weighting The query message shows the current time weighting The data fields and their settings are listed in Table 8 20 To Sound Level Meter Status Def From Sound Level Meter 930697 1e Fig 8 39 Syntax for the TW command BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 31
63. fixed reset due to changing Transferring results to computer Turning off MEFBSIOD 2 2 RERO Set eerte Version no Viewing conditions W Weighting frequency frequency Peak frequency RMS Index 4 Precision Integrating Sound Level Meter Type 2236 User Manual Br el amp Kjaer
64. g an gles You can switch on a back light and adjust the screen s contrast The contrast adjustment may be especially useful in very high or very low temperature environments To switch the back light on press The back light switches off automatically 30s after the last key press To switch the back light off before this press To set the screen s contrast follow the instructions below 00 00 01 F SPL 58 6 dBA CONTRAST TestTestTestTes tTestTestTestTe Frequency Wt Parameter ed CONTRAST eS spec MOSS ETestIestTestIe gt CONTRAST O TestTestTestTes tTestTestTestTe gt Br el amp Kj r E d Type 2236 931031 1e 930800 2e 3 24 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjeer User Manual Chapter 4 Measuring AL CAlbPAtlpu scusa Uc dite ubivis SU oV iS 4 2 Introd ction 41 tete et RR GE e e e fe thes es 4 2 Calibrating the Sound Level Meter ss 4 3 Checking the Calibration srrrrororrrnrrrorrrnrrrrrrrrrrrrnrnreeenn 4 5 4 2 Checking the Sound Level Meter 4 7 4 3 Starting a New Measurement 4 8 4 4 Pausing a Measurement 1 7 s 4 10 4 5 Continuing a Measurement 222 1s 4 11 4 6 Starting a Frequency Analysis 4 12 4 7 Setting the SLM to Start Automatically 4 13 4 8 Changing the Displayed Parameter 4 1
65. grade to 512KBytes available T Available with Precision Integrating Sound Level Meters Types 2236 B 009 and 2236 D 009 Table 8 21 VErsion data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 33 User Manual Precision Integrating Sound Level Meter Type 2236 User Manual Briel amp Kj r Index Numerics 1 1 octave filter 4226 calibration with 4231 calibration with 3 12 8 21 4 38 4 8 A A frequency weighting 3 12 6 4 8 22 AC Output Accessories ANSI Draft S 1 43 ANSIS 1 4 Auto logging default effect on time weighting Auto start default AUTOLog AUTOStart B Back light Back up battery BATt Battery back up level replacing warnings BAUd Baud rate BS 2475 C frequency weighting Calendar wrong date or time Calibration checking conditions free or diffuse field measurements nominal level sese WIEN eee eessue eee o xt PR RE e pnus Calibration set up Multifunction Acoustic 4226 Sound Leve Calibrators Changing batteries displayed parameter level reset due to Settings Checking calibration Settings status CLock Clock BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Index Command message overview 8 6 Computer co
66. h the available parame ters press Parameter A or V respectively When a Peak parameter is shown the frequency weighting shows the current weighting of the Peak signal When an RMS parameter is shown the frequen cy weighting shows the current weighting of the RMS signal The display shows N A if you se lect a displayed parameter which is not available with the current time weighting or after changing the measurement range without resetting Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 5 Storing and Transferring Results 5 1 Storing Results in a Record 5 3 5 2 Recalling Results from a Record 5 4 5 amp 9 Erasme Results x sontes beet Uit e tet 5 5 5 4 Setting up the Interface 27 sss 5 6 5 5 Setting up the Output Formats 7 48 5 8 Introduction z iie eee e giten dtes 5 8 Output Formats eese eene nnne 5 10 LeyelDistrib tion 2 teer de rete eedem 5 15 Cumulative Distribution esee 5 16 Checking and Changing the Output Formats 5 17 DO Prints soo aS UEM v Eas 5 18 5 7 Transferring Results to a Computer 5 21 5 8 Interpreting the Log Times 5 24 BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 1 User Manual Chapter 5 Storing and Transferring Results 5 9 Record
67. he PAuse command 8 24 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjeer User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer PErcentile The PErcentile command message sets the selected percen tile The query message shows all the current percentiles The data fields and their settings are listed in Table 8 15 To Sound Level Meter No Percent PERCENTILE SF D 930688e Fig 8 29 Syntax for the PErcentile command To Sound Level Meter PERCENTILE To Sound Level Meter PERCENTILE LEVELS GP C Fig 8 30 Syntax for the PErcentile query message and sound level meter 930689e response Field Name Field Setting Commenis No LN1 LN1 default L1 LN2 LN2 default L10 LN3 LN3 default L90 Percent X 1 to 99 Table 8 15 PErcentile data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 25 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer PRint The PRint command message prints the selected results in the current output format to a connected printer or computer If no results are selected the sound level meter prints the last selected results The data fields and their settings are listed in Table 8 16 To Sound Level Meter Result of Fig 8 31 Syntax for the PRint command 930685e Field Name Field Setting Comments Result
68. iffuse Field Measurements The sound level meter is calibrated in the same way for free field measurements according to IEC and diffuse field meas urements according to ANSI However the calibration levels for some calibrators may be different depending on which measurements are to be made See the calibrator s user man ual for more details Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 4 Measuring Calibrating Always remove the Random Incidence Corrector DZ9566 if fitted from the microphone when calibrating or checking the calibration Which Calibrators Can I Use 4 1 2 The sound level meter can be calibrated with Sound Level Calibrator Type 4231 Multifunction Acoustic Calibrator Type 4226 or a similar calibrator All are referred to on the sound level meter s display as the calibrator Each calibrator is slightly different The actual calibration level is not necessarily equal to the nominal calibration level It is therefore important to set the calibration level to the one given on the calibration chart for the calibrator used Calibrating the Sound Level Meter Sound Level Calibrator Type 4231 provides a nominal pres sure field calibration signal of 94 or 114dB at 1kHz The nominal diffuse field calibration signal is also 94 or 114 dB but the nominal free field calibration signal is 93 8 or 113 8 dB Multifunction Acoustic Calibrator Type 4226 provides a nom
69. igs 6 8 and 6 9 show the influence of Tripod UA0801 and Protective Cover UA 1236 under free field conditions and with pure tones BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 11 User Manual Precision Integrating Sound Level Meter Type 2236 User Manual Briel amp Kj r Chapter 2 An Example Measurement 2 WntrOQdUellont soot ton atr 2 3 2 2 Making a Measurement sse 2 9 BB0909 13 Precision Integrating Sound Level Meter Type 2236 2 1 User Manual Chapter 2 An Example Measurement Introduction 2 1 2 2 Introduction This chapter guides you through the basic functions of the sound level meter by instructing you on how to make a noise measurement in a free sound field You can find further in formation on the various steps in the relevant sections of the User Manual It is a good idea to have the fold out back cover open so that you have an annotated illustration of the sound level meter in front of you while you follow the example measurement We have assumed that the sound level meter is switched off and has not been used before following these instructions If it has ensure that you are using the default set up see section 3 3 before following the steps below We have also assumed that you will calibrate the sound level meter with Sound Level Calibrator Type 4231 and that you will print out your results using Serial Printer WQ 1138 Making a Measur
70. ing Frequency Wt A or W change the frequency weighting to the centre fre quency of the band in which you want to start the analysis see section 3 6 2 Press Press 9 After you have completed the measurement in that fre quency band press M Store the Overall Results in the Memory see section 5 1 6 Using Frequency Wt A or V change the frequency weighting to the centre frequency of the band in which you want to continue the analysis The sound level meter resets You are now ready to meas ure in the next frequency band 7 Repeat steps 3 to 6 for the other bands in which you want to analyse Only available with sound level meters with filter sets Types 2236 C 009 and 2236 D 009 4 12 Precision Integrating Sound Level Meter Type 2236 User Manual Br el amp Kjaer Chapter 4 Measuring Setting the SLM to Start Automatically 4 7 Setting the SLM to Start Automatically The sound level meter can be set to automatically start at any time and date within the next month e g from 19th May to 18th June 110 omm 00 00 00 58 6 dBA PAUSE F SPL Frequency Wt Parameter Y amp AUTO START Poff Briel amp Kj r E d Type 2236 1 See next page 931036e only available if On 930731 2e BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 13 User Manual Chapter 4 Measuring Setting
71. ing and elapsed measurement time e Frequency weighting Peak or RMS or filter centre frequency selected parameter with lev el Back light with switch The quasi analogue bar is updated 10 times per second Displayed parameter level updated once per sec ond Exchange Rate 3dB Reset Resets Buffer including elapsed time to zero Warning prior to reset if elapsed time gt 1min Reset when changing frequency or time weighting Resets all results in Log Memory and Buffer if held down together with Data Optional reset when changing level of measure ment range Lys and distributions not available if range change is without reset Memory 40 Records of Overall Results Result Logging Leg L10 and Lgo Logged Every 0 11 1 10 30s 1 5 10 15 30min or 1hour T Only available with Types 2236 C 009 and 2236 D 009 when filter selected t Only Leq logged at this setting Reading in dB referred to continuous signal level dB nominal measured 4kHz ate 100 Pulse length ms t 931682e Fig 6 4 Response of the sound level meter to tone bursts of varying characteristics 6 4 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 6 Specifications Specifications Logged To log or interface Memory Capacity 128KBytes Types 2236 A 009 and 2236 C 009 Equivalent to 21600 sets of results for example 6h of 1s logging 512KBytes Types 2236
72. ing on a DAT recorder 5 25 5 2 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transferring Results Storing Results in a Record 5 1 Storing Results in a Record Results in the buffer can be stored as one of 40 records in the sound level meter s memory The results are stored in the first available record that is the first set of results in record 1 the next set in record 2 etc Example If you have stored 4 records and then erased record 2 the sound level meter will store the next set of results in record 2 The next set of results will then be stored in the first available record that is record 5 30mm 110 PAUSE 00 20 00 F SPL 58 6 dBA STORE Overall Results As Rec No X 3 Frequency Wt Parameter DRAT STORE Overall Results AG REC INO A Br el amp Kj r EH d Type 2236 931038e 930510 1e BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 3 User Manual Chapter 5 Storing and Transferring Results Recalling Results from a Record 5 2 Recalling Results from a Record Results in a record in the memory can be recalled to the sound level meter s buffer You can then look at that record s Overall Results 30mm 110 PAUSE 00 00 00 F SPL 58 6 dBA RECALL Record no XX D Edit NO Settings OK Lu Level 4 Frequency
73. nction available from the front plate of the sound level meter The data fields and their settings are listed in Table 8 4 To Sound Level Meter From Sound Level Meter Level S ev I 930666e Fig 8 7 Syntax for the BATt query message and sound level meter re sponse Field Name Field Setting Comments Level XX X Volts Status LOW Replace batteries Table 8 4 BATt data fields and codes BAUd The BAUd command message sets the sound level meter s baud rate After you have changed the sound level meter s baud rate you must change the computer s baud rate to the same value in order to continue communicating with the sound level meter 8 10 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer The query message shows the current baud rate The data fields and their settings are listed in Table 8 5 To Sound Level Meter Rate BAUD S From Sound Level Meter SETTING BAUD RATE TO Rate 930667e Fig 8 8 Syntax for the BAUd command To Sound Level Meter From Sound Level Meter CDRS Rate Fig 8 9 Syntax for the BAUd query message and sound level meter re sponse Field Name Field Setting Comments Rate command 12 1200 24 2400 48 4800 96 9600 192 19200 Rate response 1200 2400 4800 9600 19200 Table 8 5 BAUd data fields and c
74. ntrol from ee REG A 8 4 set up transferring results to Computer control switching on the SLM Syntax CONtinue Contrast Controlling from a computer Controls Cumulative Distribution not available seen D Daily Personal Noise Exposure Level 8 3 Data Date wrong date or time DAT recorder DC Output DEFault Default set up switching on in Diffuse field calibration Diffuse field response Directional characteristics DISp Display Displayed parameter default Distribution Cumulative ccacovenauunaace Tay els oo MM MM oc E EL psed 4j ea REN RR Elapsed time ERASE Erase Example measurement EXposure Exposure Time default Extension cable microphone External power supply FREE Free memory log Free field calibration Free field response Frequency analysis making a Frequency response Frequency weighting default Peak default RMS Peak reset due to changing RMS 55 tert shown on display HAndshake Handshake Hardwire Heading I L time weighting IEC 1672 IEC 651 IEC 804 Impulse time weighting Interface set up L Level Distribution not available LN parameters not available Log capacity capacity left Logged Results erasing Interpreting times use in spr
75. o control the sound level meter from a computer BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual o PRARARPRR Index Controls Display and Sockets An overview of the sound level meter s pushkeys controls and main display 0 4 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 1 Useful Information 1 1 About this Manual 1 2 1 2 About the Type 2236 Sound Level Meter 1 2 Parameters in n a a E NS 1 2 DSLEIMIOS EN PR EIE 1 3 Data Operations cessere 1 7 MOM OEY esce vei ere Hee e TERT E t Teen 1 9 3 Practical Hints odo o DOCU QE Rd Rn 1 10 BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 1 User Manual Chapter 1 Useful Information About this Manual 1 1 1 2 About this Manual Figures are used to guide you through using the pushkeys Please note the following when using the figures nx Press this pushkey n times OK Press this to save any changes made in connection with the Settings or Data pushkeys NO Press this to return to the screen indicated without sav ing any changes made About the Type 2236 Sound Level Meter 1 2 1 Parameters Precision Integrating Sound Level Meter Type 2236 is a Type 1 sound level meter complying with BS5969 and BS 6698 It can measure the following parameters MaxL maximum SPL since the last reset e MinL minimum
76. odes BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer CLock The CLock command message sets the date and time on the sound level meter s calendar and clock The query message shows the date and time on the sound level meter s calendar and clock The data fields and their settings are listed in Table 8 6 To Sound Level Meter Date Time of Jer 930669e Fig 8 10 Syntax for the CLock command To Sound Level Meter From Sound Level Meter Date Time CURRENT DATE amp TIME SP D 930670 1e Fig 8 11 Syntax for the CLock query message and sound level meter re sponse Field Name Field Setting Date YYYY MM DD Time HH MM SS Table 8 6 CLock data fields and codes 8 12 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer CONtinue The CONtinue command message starts a measurement without resetting the sound level meter To Sound Level Meter From Sound Level Meter MEASUREMENTS CONTINUED 930671e Fig 8 12 Syntax for the CONtinue command DEF ault The DEFault command message sets the sound level meter to its default set up To Sound Level Meter DEFAULT From Sound Level Meter SET TO DEFAULT SET UP ER MEASUREMENT RESET 930672e
77. ou want to measure according to ANSI standards i e diffuse field fit the supplied Random Incidence Corrector DZ9566 on the microphone The direction of the sound level meter is unimportant If however the sound field is free measure with the sound level meter at an angle of between 70 and 80 to the sound source Press 9 The sound level meter starts measuring with the selected set up Note When mounting the sound level meter on a tripod posi tion the tripod so that one of its legs points in the same direction as the sound level meter This will reduce the risk of damaging the microphone if the tripod is acciden tally knocked over See section 1 3 for practical hints and information about measuring according to standards BB0909 13 Precision Integrating Sound Level Meter Type 2236 4 9 User Manual Chapter 4 Measuring Pausing a Measurement 4 4 Pausing a Measurement Frequency Wt MP PAUSE Stein Br el amp Kj r Parameter RD 00 06 00 66 5 dBA m Type 2236 931034 1e The Pause mode of the sound lev el meter allows you to store re sults in its memory or transfer results across the interface to a printer or computer Press 9 PAUSE is shown on the left hand side of the display The clock stops counting the measurement time The display and quasi ana logue scale continue to show the current status of the displayed parameter and input signal level
78. our 1 5 V LR6 AA size alkaline batteries as shown in the battery com partment and press the compartment lid back into place Note If you cannot switch on the sound level meter after replacing the batteries check that they are correctly inserted The sound level meter is designed so that it will not work if BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 5 User Manual Chapter 3 Setting Up the SLM for Measurement Fitting Batteries 3 2 2 3 2 3 the batteries are wrongly inserted in the battery compart ment Warnings It is possible for batteries to explode or leak if they are handled incorrectly so e For long term storage remove the batteries and keep the sound level meter in a dry place Never mix different makes or types of battery Never mix charged and discharged batteries Always label the outside of the battery compartment with the type of batteries contained Using an External Power Supply The sound level meter can be powered from a regulated or smoothed 7 15 V DC supply via the External Power socket on the base e g from the mains supply via an adaptor You can connect the external power supply even when the batteries are installed The sound level meter automatically selects the source with the highest supply voltage The ex ternal power supply will not damage the batteries but neither will it recharge the batteries Always switch off the sound level meter by pressing before
79. ove the adaptor 2 Start a communications program e g BK Link or Pro Comm on the computer Alternatively use Br el amp Kj r software such as Reproter or dB2XL which are written specifically for communicating with your sound level me ter and working with and displaying sound level meter data 3 Configure the computer as follows 9600 Baud 8 data bits 1 stop bit Parity none Handshake XON XOFF see section 5 4 4 Switch on the sound level meter 5 Setthe sound level meter s handshake to XON XOFF and its baud rate to 9600 see section 5 4 6 Press Enter on the computer Communication is established and the prompt is shown on the computer screen The sound level meter can now be controlled from the computer Note The baud rates and handshake of the sound level meter and the computer must be the same to enable them to com municate without losing or corrupting data BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 5 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer 8 3 2 Commands There are two types of commands e Commands Change the set up of the sound level meter or order it to do something e Queries Cause the sound level meter to display infor mation about its setup The command and query messages available are listed in Table 8 1 Message Command Qu
80. pter 2 An Example Measurement Making a Measurement 31 32 Press Parameter A The Store Set up screen see Fig 2 4 appears STORE Overall Results as Rec No 1 930996 le Fig 2 4 The Store Set up screen Press OK The Overall Results of the measurement you have just made are stored as Record No 1 in the sound level meter s memory Printing out Overall Results Warning When connecting the sound level meter to the printer ensure that both the printer and the sound level meter are switched off Otherwise the instruments could be damaged 33 34 35 36 Switch the sound level meter off Connect it to Serial Printer WQ 1138 via the Serial Interface socket on the base of the sound level meter using 9 pole Cable with 25 pole Adaptor AO 1386 Switch the sound level meter on Hold down the printer s On Line pushkey and switch the printer on The printer prints its set up Ensure that the printer s baud rate is 9600 see the print er s instruction manual for details on how to change its baud rate Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 2 An Example Measurement Making a Measurement The sound level meter is set by default to output the overall results with a short heading at a baud rate of 9600 To get a print out the printer and the sound level meter must have the same baud rate 37 Press Data Th
81. r Time EXPOSURE SP 930676e Fig 8 18 Syntax for the EXPosure command To Sound Level Meter EXPOSURE From Sound Level Meter Time EXPOSURE TIME HH MM SP 930677e Fig 8 19 Syntax for the EXPosure query message and sound level meter response Field Name Field Setting Commenis Time HH MM Between 1 min and 24hours Table 8 10 EXposure data fields and codes 8 18 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer FOrmat The FOrmat command message sets the selected Output For mat The query message shows the current Output Format for the selected results The data fields and their settings are listed in Table 8 11 To Sound Level Meter FORMAT 930794e Fig 8 20 Syntax for the FOrmat command To Sound Level Meter Type FORMAT SP From Sound Level Meter 930793e Fig 8 21 Syntax for the FOrmat query message and sound level meter response BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 19 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer Field Name Field Setting Comments Type command query O R Overall Results LR Logged Results L D Level Distribution C D Cumulative Distribution Format command PR24 Printer 24 char PR Printer SP Spread
82. rring Results Printing If you are using Portable Printer Type 2322 then set the 2236 to 9600 baud and XON XOFF handshake see sec tion 5 4 for instructions If you are using another printer please refer to your printer manual for settings 3 Set up the Output Format of the results you want to print see section 5 5 If you are using Portable Printer Type 2322 or an IBM Proprinter compatible select Printer For printing on a Graphics Printer Type 2318 select Printer 24 char line 4 Setthe sound level meter in Pause mode and follow the instructions given in the figure below The printer prints the selected results in the selected output format see section 5 5 To stop printing To stop printing at any time press NO This will stop printing immediately and delete all unprinted data from the printer s buffer BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 19 User Manual Chapter 5 Storing and Transferring Results Printing 30mm 110 PAUSE 00 20 00 F SPL 58 6 dBA PRINT Overall Results 9 Edit NO Settings All Records inert Record kOvera Results Cum Distrib Level Distrib 22M Logged Res Overall Res a M A Frequency Wt Parameter DEE PRINT Record b no XX PRINT P Overall Results only available when Record selected XX last Record in memory 931
83. rst log ging for logged results See Fig 5 2 to Fig 5 8 for examples of output formats with short headings 5 8 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats Long Heading Bruel amp Kjaer SIM Type 2236 COMMBNTS SETTINGS Time Wt E Frequency Wt RMS A Frequency Wt Peak e Range Level 50 130 d d OVERALL RESULTS 12 Apr 1993 DB 35 50 Elapsed Time 00 15 00 Pauses o Overload 0 0 MaxP 405 9 dB MaxL 95 3 dB Mini 52 9 AB Leg 84 4 GB SEL 113 9 dB Lepd Te 5h30 82 8 dB Li 94 0 dB Lio 76 3 dB L90 55 0 dB 931161 1e Fig 5 1 Overall Results output format with a long head ing A heading with space for remarks about the measurement together with the set up of the sound level meter in a long format and the date and time of the start of the measurement for overall results or distributions or of the first log ging for logged results See Fig 5 1 for an example of an out put with a long heading Overall Results Note The long heading in spreadsheet format see section 5 5 2 is the same as the short heading and is not as described above BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 5 5 2 Output Formats You can print your logged res
84. see section 3 10 Then if there are more than 1min of measurement results in the buffer i e the elapsed time shown is greater than 1 min the screen tells you that changing the measurement range will erase all previous measurement results from the buffer If you do not want to erase the measurement results press NO The measurement range will not change Press OK to change the range and erase the measurement results 3 10 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Time Weighting 3 5 Setting the Time Weighting The time weightings available are shown below F for normal measurements S for checking average levels of fluctuating noise I for measuring impulsive noise 30mm 110 PAUSE 00 00 00 F SPL 58 6 dBA 30mm 110 PAUSE 00 00 00 S ESPL S39 dBA 30mm 110 PAUSE 00 00 00 I ISPL 586 OBA 30 EE 110 PAUSE 00 00 00 ROSPI 0946 OBAN Briel amp Kj r E d Type 2236 931020 1e 930499 1e The display shows N A if you select a time weighting which is not available with the current displayed parameter f there are more than 1min of measurement results in the buffer i e the elapsed time shown is greater than 1 min the screen tells you that changing the time weighting will erase all previous measurement results from the buffer If you do not want to erase the meas
85. sets Types 2236 A 009 and 2236 B 009 have 5 measurement ranges each with a dynamic range of 80dB Sound level meters with filter sets Types 2236 C 009 and 2236 D 009 have an extra measurement range from 10 to 90dB you must have one of the octave filters activated to select this range 10 90 dB e 20 100dB e 230 110dB e 40 120dB e 50 130dB e 60 140dB Baud rate and handshake are not affected T Only available with sound level meters with filter sets Types 2236 C 009 and 2236 D 009 and when the filter is selected BB0909 13 Precision Integrating Sound Level Meter Type 2236 3 9 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Measurement Range To move the measurement range by 10dB press Level A or V respectively 0 io Settings es DNG Frequency Wt Parameter De 30mm 110 00 00 01 PSPL S976 OBA Br el amp Kj r 2 Type 2236 931018 1e If you have selected a measurement range that is too low the signal will cause an overload If the sound level meter is currently overloaded a is shown to the right of the quasi analogue scale If the sound level meter has been overloaded during a measurement since the last reset OVL is shown at the right hand side of the screen under the quasi analogue scale You can set the sound level meter to reset when changing the measurement range
86. shake are available e hardwire e XON XOFF e none The following baud rates are available e 31200 e 9600 e 2400 e 319200 e 4800 5 6 Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 5 Storing and Transferring Results Setting up the Interface 110 00 00 01 F SPL 58 6 dBA INTERFACE 9600 Baud XON XOFF Edit Settings Show INTERFACE gt 9600 Baud XON XOFF A Frequency Wt Parameter v INTERFACE XON XOFF 9600 Baud gt XON XOFF INTERFACE Hardwire 9600 Baud No handshake XON XOFF Br el amp Kj r E d Type 2236 931041 1e 931090 2e BB0909 13 Precision Integrating Sound Level Meter Type 2236 5 7 User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats 5 5 Setting up the Output Formats 5 5 1 Introduction The output formats determine how the results are transferred to a printer or computer Each type of result has its own independent output format Results The following results are available with both long and short headings e Overall Results see section 1 2 4 e Logged Results see section 1 2 4 e Level Distribution e Cumulative Distribution Short Heading Displays the set up of the sound level meter in a short format together with the date and time of the start of the measure ment for overall results or distributions or of the fi
87. sheet Res t 1 dB 5 Heading command SH Short LO Long Type query response OVERALL RESULTS Overall Results LOGGED RESULTS Logged Results LEVEL DISTRIBUTION Level Distribution CUMULATIVE Cumulative Distribution DISTRIBUTION Format query response PRINTER 24 CHAR Printer 24 char PRINTER Printer SPREADSHEET Spreadsheet Heading query SHORT HEADER response LONG HEADER Only available if Type is Logged Results t Only available if Type is Level_Distribution or Cumulative_Distribution Table 8 11 FOrmat data fields and code FREE The FREE query message shows how much time is left in the sound level meter s log at the current logging rate and how many records are left in the sound level meter s memory Together with the BATt command it is equivalent to the Status Fast Edit function available from the front plate of the sound level meter The data fields and their settings are listed in Table 8 12 8 20 Precision Integrating Sound Level Meter Type 2236 Br el amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer To Sound Level Meter From Sound Level Meter bog Memory FREE LOG SP Status ER FREE RECORDS 6P tatus Fig 8 22 Syntax for the FREE query message and sound level meter re sponse Field Name Field Setting Comments Log Status HHH MM Memory Status XX Records Table 8 12 FREE dat
88. tegrating Sound Level Meter Type 2236 8 15 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer ELapsed The ELapsed query message shows the current elapsed meas urement time The data fields and their settings are listed in Table 8 8 To Sound Level Meter From Sound Level Meter Time ELAPSED TIME HHHH MM SS SP E Fig 8 16 Syntax for the ELapsed query message and sound level meter response Field Name Field Setting Time HHHH MM SS Table 8 8 ELapsed data fields and codes 8 16 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer ERASE The ERASE command message erases the selected results The data field settings are listed in Table 8 16 To Sound Level Meter Result of 960399e Fig 8 17 Syntax for the ERASE command Field Name Field Setting Commenis Result LR Logged Results X Record No X 1 40 ALL All Records Table 8 9 ERASE data fields and codes BB0909 13 Precision Integrating Sound Level Meter Type 2236 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer EXPosure The EXPosure command message sets the Exposure Time The query message shows the current Exposure Time The data fields and their settings are listed in Table 8 10 To Sound Level Mete
89. ter 1 Useful Information About the Type 2236 Sound Level Meter If there are other set up lines on the screen you can move the cursor to them using Level A and When the cursor is on the set up line of the Setting you want to change press Parameter A and V to step through the available parameters You can also step through them by pressing Edit see Fig 1 1 When you have the set up you desire for that Setting press OK to save the changes and check the changed Setting An accept cursor m replaces the edit cursor p to show that the sound level meter has accepted the change If you change a Setting by mistake press NO instead of OK to revert to its previous set up Fig 1 2 shows an overview of the available Settings BB0909 13 Precision Integrating Sound Level Meter Type 2236 1 5 User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter 3omm 110 PAUSE 00 00 00 F SPL 58 6 dBA AUTO LOGGING No CALIBRATION PEAK WEIGHTING OUTPUT FORMATS INTERFACE EXPOSURE TIME PERCENTILES DATE TIME AUTO START xo CONTRAST CHANGE RANGE 931084 2e Fig 1 2 An overview of the sound level meter s Settings 1 6 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 1 Useful Information About the Type 2236 Sound Level Meter Fast Edit In addition to the normal
90. the sound level meter does not reset Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 2 An Example Measurement Making a Measurement 22 After a few minutes press M The sound level meter stops measuring and logging The timer shows the total measurement time Checking the Sound Level Meter s Calibration 23 24 25 26 27 28 29 Press Show The screen shows the default Auto Logging screen Press Parameter A The screen changes to the Calibration screen Press Edit The screen shows the calibration set up from before the measurement Fit the calibrator onto the sound level meter and rest the sound level meter on a table or other flat surface Ensure that the calibrator fits snugly on the microphone Switch on the calibrator The calibrator emits the 1kHz calibration signal Press OK The sound level meter checks the calibration signal against the calibration level you set in step 5 They should be the same If they are not note the difference for in clusion in your measurement report Press NO twice The sound level meter returns to the Calibration screen and then to the main screen without being recalibrated Storing Results in the Sound Level Meter s Memory 30 Press Data The first Data screen Print Set up appears BB0909 13 Precision Integrating Sound Level Meter Type 2236 2 7 User Manual Cha
91. ults in any of the three formats described in this section The format you choose will depend on the type of printer you are using Printer For use with an IBM Proprinter or compatible serial printer for example Serial Printer WQ 1138 The format is shown in Figs 5 2 and 5 3 Bruel amp Kjaer S LM Type 2236 Bruel amp Kjaer SETTINGS SIM Type 2236 50 130 dB SETTINGS 50 130 dB Peak C 12 Apr 1993 15 11 19 LOO L 0 12 Apr 1993 08 35 50 hh mm ss dB fdBl Leg 45 11 19 92 0 65 7 dB 99 1 69 0 96 8 66 5 73 8 92 3 70 6 78 6 101 2 73 7 76 1 93 5 73 9 75 1 88 9 58 8 78 1 88 9 5B 8 77 7 91 5 61 6 72 8 79 9 58 8 0274 3 77 7 44 4 63 7 88 4 58 2 69 3 77 1 56 8 60 6 89 7 59 6 70 2 87 1 56 8 931169 te 931177 2e Fig 5 2 Printer output format Fig 5 3 Printer output format with short heading re with short heading re sults logged every 1s sults logged every 0 18 5 10 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 5 Storing and Transferring Results Setting up the Output Formats P indicates that there has been a pause during that logging interval see section 5 8 O indicates that there has been an overload OVL during the logging interval Printer 24 character line You must use this format when you use Graphics Printer Type 2318 It uses a special character set also for overall results Do not use this format with any oth
92. urement results press NO Press OK to change the time weighting and erase the measurement results BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 11 User Manual Chapter 3 Setting Up the SLM for Measurement Setting the Frequency Weighting 3 6 3 6 1 3 6 2 Note If results are being logged every 0 1s the sound level meter sets the time weighting to 12 ms shown on the display by q You cannot change the time weighting until you change the logging rate or switch off auto logging see section 3 11 Setting the Frequency Weighting Introduction If the selected parameter is Peak or MaxP then the frequency weighting of the Peak signal is shown Otherwise the fre quency weighting of the RMS signal is shown Therefore the frequency weighting shown always corresponds to the select ed parameter Setting the RMS Frequency Weighting The available frequency weightings of the RMS signal are shown below A for general sound level measurements C for checking the low frequency content of a noise if the C weighted level is much higher than the A weighted level then there is a large amount of low frequency noise L for determining the unweighted SPL XHz with filters for measuring the frequency content of a noise in order to choose for example the relevant hearing protection If there are more than 1 min of measurement results in the buffer i e the elapsed time shown is greater
93. vel which if maintained over 1s would have the same energy as the measured Leq over the measurement time T see Fig 8 1 Sound Pressure Level dB Time varying RMS Measurement duration 831794 1e Fig 8 1 SEL compared to weighted Leg If the time weighting is I SEL becomes IEL 8 2 Precision Integrating Sound Level Meter Type 2236 Briel amp Kj r User Manual Chapter 8 Appendices LEP d 8 2 LEPa Lepa the Daily Personal Noise Exposure Level is the con stant sound level which if maintained over 8hours would have the same energy as the measured A weighted Leq ex tended over the Exposure Time T see Fig 8 2 L EP d A gt t T T 8h 913275 1e Fig 8 2 Lgpq compared to Laeq In Fig 8 2 Leg the average level during the Exposure Time T the actual measurement time T The Exposure Time The Exposure Time can be set using the sound level meter s Settings see section 3 8 Therefore you can investigate the effect of different Exposure Times on the Lypg BB0909 13 Precision Integrating Sound Level Meter Type 2236 8 3 User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer 8 3 8 3 1 Controlling the Sound Level Meter from a Computer Introduction Messages From the Sound Level Meter This chapter describes the operation of the sound level meter via its serial interface It assumes that
94. you are familiar with manual operation of the sound level meter and have some experience of interface programming Command Syntax All commands can be truncated to a mnemonic indicated by capitals in the section title e g AUTOLog can be written as AUTOL If a command is unknown the sound level meter sends the following message UNKNOWN COMMAND If a parameter following a command is unknown the sound level meter normally treats the command message as a query message In some cases the sound level meter sends an ex planatory message instead All messages sent to the sound level meter must end with Return All messages from the sound level meter end with CR and LF carriage return and line feed Note In the syntax diagrams in section 8 3 2 SP represents Spacebar and CR represents CR and LF carriage return and line feed Setting up the Computer Warning When connecting the sound level meter to the computer ensure that both the computer and the sound level Precision Integrating Sound Level Meter Type 2236 Br el amp Kjaer User Manual Chapter 8 Appendices Controlling the Sound Level Meter from a Computer meter are switched off Otherwise the instruments could be damaged 1 Connect the computer to the sound level meter via the Serial Interface socket on the base of the sound level meter using 9 pole Cable with 25 pole Adaptor AO 1386 If the hrscomputer has a 9 pole interface socket rem

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