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CR:800B User Manual - Cirrus Research plc

1. Filter mode 1 1 or 1 3 filter selected Selected frequency Filtered Lzs Lzr or LzI not stored Filtered Lzeq stored Lae Led Lzeq stored Run time Date and time Frequency Bands Nominal Frequencies CR 800B User Manual Page 69 1 1 Octave Band 31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz 1 3 Octave Band 25Hz 31Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz 200Hz 250Hz 315Hz 400Hz 500Hz 630Hz 800Hz 1kHz 1 25kHz 1 6kHz 2kHz 3 15kHz 4kHz 5kHz 6 3kHz 8kHz 10kHz 12 5kHz 16kHz 20Hz amp 20kHz with MO 800 6 Factory Option Memory 16Mbit memory allowing up to 1300 broadband measurements 770 1 1 octave measurements 330 1 3 octave measurements For example broadband mode allows 12 days of 15 minute measurements to be stored Calibration records are automatically stored in the instrument memory Noise Profile Up to 11 days at 1 second acquisition Automatic Measurements The unit can be set to record and store data over fixed times of 1 minute 5 minutes 10 minutes 15 minutes 30 minutes 1 hour 8 hours 12 hours or a user defined period Automatic Repeat From 2 to 999 measurements broadband mode only Auto synchronise to the clock Display Matrix LCD with backlight amp Quasi Analogue Bar Graph Selected measurement parameter with level Warnings for Overload Under Range and Low Battery Time amp Frequency Weighting Elapsed measurement time Real time short Leq broadband
2. Produced by Cirrus Research plc Acoustic House Bridlington Road Hunmanby North Yorkshire YO14 OPH United Kingdom Copyright Cirrus Research plc 2007 Reference Number 07 03 CR 800B 03 Document Printing Date Monday 23 July 2007 CR 800B User Manual Page 3 PROTAC Cs iccetecsaucatevaeveskawtavesteasdscacdstevectueseucebasecvoahusccucstendeucstubadscciudavestesedacsaussasectessescsauses 6 Messages and Symbols serienn 4 nr prit edes teda reside HER ed aua Peg Led Debe TOR E LEP RE de eu a epe eds 6 Section 1 I ntroduction 1 oi ieiv cisci ey nvks vaa ra aa Sa ERUEUAEENERIIRRE NUN SENE KNIE aA 7 Mairi Feat tes eee edex e ex iden wi acids Sais eva ur dala vate ER e Ee exte dale rd dex wa ea n xxt ah 7 Measurement FUNCtIONS ue m nr xe ERE ER RAE e ax de se x Sheed d Wd ax RR C Pe Y RYE ER 7 Broadband Measurement Mode sss sss sss s esse esse eee EE EEE EEE nnne nnns 7 1 1 amp 1 3 Octave Band Measurement Mode sesseesssesseen nemen nnnm nnn 8 Options S ACCeSSOFrIGS s orca Te Ea Eve EE Ee YE Sawa nere Nd Mee Y coe du pea va deua d KEAR nee a oh 8 Section 2 Getting Started lt 2c59sxaz 225 vase 2899 STR ONE RARE ERKE uasa uada uu ann 9 HOW lt THT 9 Make a 15 minute Broadband Measurements sese eee eee e eee e eee ne eee eee ered 9 Make a 1 1 Octave Band Measurement over 1 minute 0 e e ee e eee eee eee eee eee eee eee ete 9 Make a 1 3 Octave Band Measurement over 5 minutes eee e e ee e cece e eee eee 9 Make
3. The diagram below show the measurement starts with the Auto Sync function enabled Start Button Pressed 5 minute 10 minute measurement 10 minute measurement 10 minute measurement measurement OS ecm s S 12 00 12 05 12 10 12 20 12 30 12 40 To enable the Auto Sync function select the Run Duration option from the menu and then select the Synchronise function Use the Up and Down arrows to switch on the off the Auto Synchronise function Press Exit when finished Key Press Display Run Duration OK 7 A User Defined Set User Time Auto UTER Repv Syncv 00 15 00 CR 800B User Manual Page 35 Synchronise OK Exit Repv Syncv 00 15 00 When the Auto Synchronise function has been selected the display will show the Sync at the bottom of the screen with a tick next to it as shown above Measurement Range One of the most important features of a Sound Level Meter is the measurement range If the measurement range is set too high the instrument may not be able to record low levels If the measurement range is set too low high noise levels will overload the instrument and make the measurement invalid Therefore it is vital that the correct measurement range is chosen for the noise to be recorded To check the current measurement range press the Range key Key Press Display Comments Cirrus CR 800B NEN 7 59 8 amp 25 06 03 07 25 56 Range LAF 58 9 The curre
4. Broadband Mode V 1 1 Octave Mode 1 3 Octave Mode Menu CR 800B Menu OK 7 Calibrating Please wait CR 800B Menu NEN 7 Calibrated to 93 7 dBA Press Exit key CR 800B User Manual Page 11 If the calibration is successful press the exit key to return to the main screen Set the measurement duration Press the menu key to view the current measurement duration and the status of the auto repeat and auto synchronise function At the bottom of the screen is the current configuration Key Press Display Comments CR 800B Menu In this example the measurement EN 07 duration is set to 15 minutes Calibrate Broadband Mode v The Auto Repeat function is 1 1 Octave Mode switched on 1 3 Octave Mode Menu v The Auto Synchronise function is RepY Syncv 00 15 00 switched on CR 800B Menu Calibrate Broadband Mode v 1 1 Octave Mode 1 3 Octave Mode um mW NN Repv Sync 00 15 00 00 15 00 If the measurement duration is not as required use the Measurement Duration menu option to set the required measurement duration Refer to page 31 for details of setting the measurement duration Check the measurement range Press the Range key to check the current measurement range Key Press Display Comments Range LAF In this example the measurement range is set to 70dB to 140dB Range 10dB to 140dB 60dB to 130dB 50dB to 120dB 40dB to
5. CR 800B User Manual A division of the frequency range into bands the upper frequency limit of each band being twice the lower frequency limit Single 1 1 Octave bands divided into three parts A standard weighting of the audible frequencies designed to reflect the response of the human ear to noise An instrument that provides a reference noise source that is used to calibrate and check the performance of a Sound Level Meter Noise Measurements using parameters which include all the audible noise such as dB A and dB C A standard weighting of the audible frequencies used for the measurement of Peak Sound Pressure level A label used to show that the Sound Level Meter conforms to the specification of a European Directive Decibels A weighted Decibels C Weighted Decibels Z weighted The units of sound level and noise exposure measurement German Standard which defines the additional measurements Larteg amp Lreqr A standard time weighting applied by the Sound Level Meter The International Standard for Sound Level Meters The International Standard for Integrating amp Integrating Averaging Sound Level Meters The International Standard for 1 1 Octave amp 1 3 Octave Band Filters The International standard for Sound Level Meter and Integrating Averaging Sound Level Meters that replaces both IEC 60651 and IEC 60804 A standard time weighting applied by the Sound Level Meter A Sound Level Meter which accumulates the total
6. LAFmax in this example is shown The Sound Exposure Level or LAE is shown If the User Metric is configured for either the LAFTeq or LIeq t functions these will be shown instead of the LAE value Page 26 CR 800B User Manual Display Running The Sound Level is shown in this case the LAF Elapsed 00 08 23 Display Running LAF The real time display of the noise level is shown as 1 second Leq samples The display shows 2 minutes of information and then starts to scroll across the screen 30 06 03 11 12 07 Pausing and Resetting a measurement During a measurement the user can pause the measurement by pressing the Start Pause key Key Press Display Comments The measurement is paused Elapsed 00 08 23 To restart the measurement press the Start Pause key again van When a Broadband measurement is paused the collection of data for the overall parameters such a the Leq is paused However the Time History measurement continues and the instrument codes this data When the information is downloaded to the Deaf Defier3 software the user can see when the measurement was paused o Information recorded by the Time History store when the instrument is in pause mode is not used in the calculation of the overall parameters The user can reset and discard the current measurement when the instrument A b s running by pressing the Reset key This will delete the current me
7. Cirrus CR 800B NEN 7 97 0 z 25 06 03 07 25 56 Measurement Range Key Press Display Cirrus CR 800B LAF e dB 25 06 03 07 25 56 LAF Range Berge 70dB to 140dB 60dB to 130dB 50dB to 120dB 40dB to 110dB 14 07 03 15 25 03 Range 50dB to 110dB 40dB to 100dB 30dB to 90dB 20dB to 80dB 14 07 03 15 25 03 Comments The current time and date are shown at the bottom of the screen Comments The current measurement range is shown highlighted Use the Up and Down Arrows to change the range Press the OK key to change the range or Exit to discard The bar at the top of the screen shows the noise level in proportion to the measurement range Page 20 CR 800B User Manual Measurement Mode Key Press Display Comments Cirrus CR 800B NEN 7 97 0 25 06 03 07 25 56 CR 800B Menu The current measurement mode is m 0 Calibrate Menu shown on the screen Broadband Mode V In this example the measurement 1 1 Octave Mode mode is Broadband 1 3 Octave Mode v RepY Syncv 00 15 00 Measurement Duration Key Press Display Comments Cirrus CR 800B NEN 7 LAF e dB 25 06 03 07 25 56 CR 800B Menu The measurement duration is Menu shown at the bottom of the opened Broadband Mode V 1 1 Octave Mode 1 3 Octave Mode In this example the measurement time is 15 minutes wv Repv Syncv 00 15 00 W
8. Time History Type 1 Type 2 Under Range Z Weighting CR 800B User Manual Sound level with Z Frequency weighting and Impulse Time weighting The maximum Sound level with Z Frequency weighting and Impulse Time weighting Sound level with Z Frequency weighting and Slow Time weighting The maximum Sound level with Z Frequency weighting and Slow Time weighting The input to the Sound Level Meter is too high for the current measurement range Change the range The maximum value reached by the sound pressure at any instant during a measurement period in dB usually with C frequency weighting Sound Exposure Level displayed as Lae Lce or Lze A standard time weighting applied by the Sound Level Meter Sound Pressure Level with a Frequency weighting such as dB A An instrument for measuring various noise parameters Sound Pressure Level the basic measure of noise loudness expressed in decibels A calculation performed by a Sound Level Meter on the noise levels measured during the measurement period to describe the statistical spread of the noise A sample of the noise levels taken every 1 second throughout the measurement period Laboratory amp Field Grade for Sound Level Meters General Field Grade for Sound Level Meter The input to the Sound Level Meter is too low for the current measurement range Change the range Z weighting is a flat frequency response of 8Hz 20kHz 1 5dB excluding microphone response CR
9. select the Time option and press OK Use the Up and Down arrow keys to change the numbers and the left and right arrow keys to move between the numbers Press the OK key when the Time is correctly set To set the Date select the Date option and press OK Use the Up and Down arrow keys to change the numbers and the left and right arrow keys to move between the numbers Press the OK key when the Time is correctly set The level at which the CR 800B instrument calibrates can be adjusted if required to suit different Acoustic Calibrators CR 800B User Manual Page 39 The default calibration level is 93 7dB for use with Cirrus Research plc CR 510 Series Acoustic Calibrators set to the 94dB setting The correction of 0 3dB is required to suit the MK 224 and MK 216 Microphone capsules used by the CR 800B Series To adjust the calibration level select the Cal Level option from the setup menu Key Press Display Comments Setup NEN 7 Contrast K Set Clock Cal Level Resolution v Repv Syncv 00 15 00 Setup Use the Up and Down arrows to adjust the level and the Left and Cal Leyel Right arrow keys to move between 093 7 the numbers Press OK to accept the calibration level Repv Syncv 00 15 00 Cirrus Research plc does not recommend the use of Acoustic Calibrators other than those manufactured or supplied by Cirrus Research plc for use with the CR 800B instruments Refer to the operat
10. 61672 1 2003 Class 1 or 2 Group X Frequency Weightings Channel 1 A C or Z Channel 2 C for Peak Z weighting is a flat frequency response of 8Hz 20kHz 1 5dB excluding microphone response When either 1 1 or 1 3 Octave Band filters are selected the Z weighting is used Amplitude Weighting Q 3 True Energy Integration Page 68 CR 800B User Manual Measurement Range Broadband 21dB A to 140dB A Type 1 25dB A to 140dB A Type 2 143dB C Peak 70 to 140dB Range 1 1 Octave Band Filters 19dB Z to 140dB Z 1 3 Octave Band Filters 14dB Z to 140dB Z Range Steps 10 80 20 90 30 100 40 110 50 120 60 130 70 140 Noise Floor Typical Broadband 18dB A Type 1 20dB A Type 2 1 1 Octave Band Filters 12dB Z 1kHz 1 1 Octave Band 1 3 Octave Band Filters 7dB Z 1kHz 1 3 Octave Band Available Measurements The following metrics can be displayed for a recorded session and stored Broadband Mode LcPeak Lar Las Lar Lcr Les Lcr Eze Lzs or Lz not stored LaFmax LaSmax Latmax LcFmax Lcsmax Lcimax LzrFmax Lzsmax or Lzimax LaFmin LASmin LAtmin LcFmin Lcsmin Letminy LzrFmin Lzsmin or Lzimin Laeq Lag or LZeq Lag Lce Or Lze LareqrLcreq OF Lzteq Larteq Lo 1 to Loo 9 five simultaneous user selected values available Run time Date and time 1 second Short Leg Noise Profile The Ln data is calculated from the Sound Level data and is Time Weighted according to the selected Time Weighting
11. Duration is divided between the frequency bands For example if the measurement duration is set CR 800B User Manual Page 33 to 15 minutes the CR 800B instrument will take a total of 15 minutes to complete the sweep through the frequency bands To meet the accuracy required by the standards to which the instrument is designed to meet there is a minimum time required to measure each frequency band Therefore the CR 800B enforces a minimum measurement duration of 1 minute for the 1 1 Octave Band Mode and 3 minutes for the 1 3 Octave Band Mode Measurement Auto Repeat The Auto Repeat function is used to set the instrument to make a series of contiguous measurements Please note that this function only operated in the Broadband Measurement Auto Repeat is not available during 1 1 or 1 3 Octave Band Mode For example if the measurement duration was set to 15 minutes and the Auto Repeat disabled after one 15 minute measurement the instrument will stop and store the measurement information the memory With the Auto Repeat function enabled the instrument will make further 15 minute measurements one after the next until the total number of measurements has been made This allows the user to tell the instrument for example to make 96 individual 15 minute measurements over a 24 hour period To configure the Auto Repeat function enter the menu and select the Measurement Duration option and then select the Auto Repeat option Key Press Di
12. This measurement parameter can be selected to be either Le Sound Exposure Level SEL Lteg Impulse Weighted Time Weighted Sound Level or Larteg Takt Maximal Sound Level Key Press Display Setup NENNEN 7 Time Weighting K Freq Weighting Change Ln Values Repv Syncv 00 15 00 Comments CR 800B User Manual Page 43 User Metric Select the required User Metric NEN 7 OK and press OK to select LAFTeq The select User Metric is indicated LIeqT by a tick Press Exit to return to the main Repv Syncv 00 15 00 display Note that if the LIeq t function is selected the CR 800B will automatically select the Impulse Time Weighting which will apply to all other measurement functions described in section Time Weighting on page 40 Before the Time Weighting can be selected to either Fast or Slow the User Metric must be set to SEL Configuring the instrument from the Deaf Defier3 software The entire configuration of the instrument can be set from the Deaf Defier3 software using the Advanced Configuration option Please refer to page 80 for details of this function Page 44 CR 800B User Manual Section 4 Viewing and Downloading the measurements When a measurement stops either by the user pressing the Stop key or when a measurement stops automatically the data is automatically stored in the memory Recalling Stored Measurements To view stored measurements ensure that the instrument is n
13. a set of twenty four 1 hour measurements ee e ee e K e e K e e K e e K K e K eee 9 Quick Staite Saua EET 10 ice O Mensan ea ERE 10 Calibrate the Sound Level Meter iie etienne danse dha ene Catenin aa A aa Cada Ra Rad tev eeu en 10 Set the measurement duration 2 e 99 CTR Y tede nennen nhan 9 E CTE ka ZN e 9 EITE VS E Rae nag iara cars 11 Check the meas rement range eiie detains 9 95 eene aE 95 935 ka ra ga sence RESDA 099 aa ee RR uaa dda kin dada 11 Change the measurement function isisisi escis E eirp huh a ea aA RR RR RRRGRRERSRRRRRRSRRARERRRRRARNT R4 RR R a K 12 Start amp Stop the measurement or e atte amer en e pee A Ra dab wale Keep slut pu arae e AN O ERR ERN ER ER RR 12 Review the measurement i s Sea 9 XT d ERa Z ce ov IAE x YR IR v dc RE ie N RR i e re NP aia A CENE cr ede IRR abla a 13 Unpacking and checking the Sound Level Meter sese s eee eee eee eee 14 Installing the software 2 lees orth Tera ERRAT X RXERADERRR READER dae RERCEER ERR E ER PATER ele 14 Assembly esee eeu o eroe Er v Lieber eR a ERI Ta eu Iv elliRiRilri6libei crRi nr AQ IP aA dente SOR cD PLE E REOR OSE 14 Pr amplifiEr II TTE 14 Using Microphone Extension Cables 0 c ccccaceceececedneaeececeteactaeecuaeececneccenssareaseedveeeebencaeesueeaeneneres 16 ST an UT 16 Using an external power supply cs ere Rent rh 9 VSN STR ex TRR NTE TAE Sewn ees nav ERR Y RRRRR dad DR RR CYS 17 Vbi 17 NK 70 Random Incidence Adaptor
14. alix ase vr rk pene Ene Dea d xac ge lx ate 70 Battery BE 70 Environmental 2 2 iorsieemee inte eei eid etuer cit wvtu sev Fav ex Dues dow oie e Fe vaa POvRUe Ux er ivan e v Ed ERES 70 External Connections een re mx e en IRA RE XR RR a XR MR ERRARE DENS AN ERRAT TR NER E des 70 ET ia HTS c 70 Output Cable eR EP 71 External POWGFr vis icone cec v vau ed ey YA REN REA a ed YET TOYS XE E eI XE Vat erm ud 71 Software SUuDDOEU cos eer cere eren eau ey ner len c t Rode c o e et v e n van nci s d ER 71 System Requlitrermnents roris uere rire ra cicer Tee usu Fara Tae sei Tua re Fa ved ed FR IETae lanai EE Ta Qe fia ve vus 71 Factory OpEIORS 2 ier e Y Tar rwr eva ita RT RARE TR ERR ARRA RETREAT H RC ATE LA Ron dd 71 Electromagnetic Performance reete xen m heh a RR RE ER RE sedate dawn be cde ERE A Faux 72 Appendix 4 Acoustic Calibrators e eeeeeseeee esee nennen esen nnes esen eenn nns 73 legs EE 73 Switching on the Calibrator rs araa z x crre rihanna k ea inan RV Ra ka AR skr RR iad KTR K aaepe ea Rr takuam aa a 73 Permanent ode 15 27 L Ooww nm 73 Calibrating a Sound Level Meter wie cete ern leet rsen achenditesseceeg sede Rana eaae er R STT ERA E 74 bBackgrouhcd NOISe cedes me NR ARE a T Bowens rong c HRE EDO cV Eder U Ee cones EUNDI PRESE dacs Dc search Rep REN 74 StabiliSation icoeet oi erdt ck wenn Ea neret tive averse dead
15. has selected Impulse Time weighting Lear User Metric may have been selected Select SEL User Metric and change Time Weighting required Overload symbol is shown The noise level is too high for Select a higher measurement the current range range Under Range symbol is shown The noise level is too low for Select a lower measurement the current range range The measurement stops after The Run Duration has been set Select the Manual Run a set time to a preset value Duration The Run Duration has been set Select the Manual Run to the User Defined value Duration The measurement does not stop as expected The Run Duration has been set to Manual Select a preset Run Duration Downloading Measurements Symptom Possible Cause Possible Remedy Measurements cannot be downloaded No measurements have been stored Repeat Measurement Instrument is not connected to PC Connect RS232 Cable to the instrument and the PC Batteries are too low Replace batteries Page 56 Section 7 Glossary 1 1 Octave Band Filters 1 3 Octave Band Filters A Weighting Acoustic Calibrator Broadband C Weighting CE Marking dB A dB C dB Z Decibel dB DIN 45641 Fast Time Weighting IEC 60651 1979 IEC 60804 1984 IEC 61260 1995 IEC 61672 1 2003 Impulse Time Weighting Integrating Averaging Sound Level Meter Lato o Lago o Lae Laeg t
16. memory When the measurement duration is set to any option other than Manual the instrument will automatically sweep through the 1 1 Octave Bands in the set duration After the Page 24 CR 800B User Manual 16kHz 1 1 Octave Band the instrument will measure a dB A dB C and then a dB Z value and then stop storing the measurement in the memory The user can override the automatic sweep by pressing the Up arrow key to step to the next frequency band The display will show until enough data has been accumulated to give an accurate measurement Key Press Display Comments Running LzZF 55 4 The instrument has not L accumulated sufficient data to give an accurate measurement 31 5 Hz 1 1 Oct l l LZeqt When enough information has aB been gathered the LZeq value will be displayed Elapsed 00 01 00 1 3 Octave Band Mode Key Press Display Comments gt Running LZF 55 4 When the measurement is Al T running the display shows Running in the top left hand 40 Hz 1 3 Oct corner LZeqt e dB Elapsed 00 01 00 If the measurement duration is set to Manual the 1 3 Octave Band frequency will stay on the current frequency until the Up arrow is pressed At the end of the measurement the user must press the Stop key to end the measurement and store the information in the memory When the measurement duration is set to any option other than Manual the instrument will automatica
17. mode Graphical 1 1 and 1 3 Octave Band recall mode only Recalled stored measurements Measurement Range Weight 450 gms Dimensions Type 1 340mm x 75mm x 25mm Type 2 300mm x 75mm x 25mm Page 70 CR 800B User Manual Batteries 2 x 1 5v Alkaline LR6 AA Battery Life Broadband Typically gt 30 hours Filter Mode Typically gt 20 hours Battery voltage is continuously monitored and warning is given on display of impending low battery condition When batteries approach end of life the unit will store any data required and switch off automatically Environmental Temperature Operating 10 C to 50 C Storage 20 C to 60 C Humidity Up to 95 RH Non Condensing External Connections RS232 Communications Via 8 pin mini Din socket with supplied ZL 800 Cable Baud Rate 38 400 Data Bits 8 Stop Bit 1 Parity None TX DC Out Auxillary AC Out Program Digital GND RX Battery Voltage Analogue GND COO Oe E Outputs Outputs via 8 pin mini Din socket using optional cables AC output Un weighted AC Output The Un weighted AC Output is affected by the range of the Sound Level Meter The Output is referenced relative to the output on the reference measurement range of 50 110dB The attenuation of the output is as follows Measurement Range Attenuation 70 140 dB 10 dB 60 130 dB 0 dB 50 120 dB 0 dB 40 110 dB OdB Reference Range 30 100 dB 10 dB 20 90 dB 20 dB 10 80 dB 25dB CR 800B User Manual Page 71 D
18. range for the CR 800B is 55dB to 95dB IEC1260 7j The range should be selected such that neither the underrange or overload flags occur during measurement The following table gives typical noise floor figures for the lowest range selection For the other ranges noise floors will be at least 10dB below bottom of range Typical filter noise figure Leg LA 2dB 5dB freq 1 3 1 1 10 80dB 10 RANGE 80dBRANGE 588g 7 d6dg 40Hz 14dB eee E LT E E HE lt T ad ho 100Hz 108 160Hz BT a a s 9d i corr c 315Hz 8dB Page 66 CR 800B User Manual 400Hz BT 630Hn 8B 800Hn 8dB 1250Hz 1600Hn 8dB L 2500Hz 8B 3150Hz L 00UHz c9dB o T 6250Hz BT 10000Hn 18 o gt Si25U0dz J 1205 qo o E roe ucc cct IEC1260 7k Not applicable IEC1260 7I The design flat Z frequency response excluding microphone capsule tolerances is 8Hz 20kHz 0 3 0 5dB IEC1260 7m The filter is not directly accessible IEC1260 7n Not applicable IEC1260 70 The instrument will operate from 10 C to 50 C The instrument may incur damage if exposed to temperatures below 20 C or above 60 C IEC1260 7p The unit meets the requirements set out in IEC651 IEC1260 7q The unit meets the requirements set out in IEC651 IEC1260 7r The unit me
19. sound energy over a measurement period and calculates an average The noise level exceeded for 10 of the measurement period with A frequency weighting calculated by statistical analysis The noise level exceeded for 90 of the measurement period with A frequency weighting calculated by statistical analysis Sound Exposure Level SEL with A frequency weighting Equivalent continuous sound pressure level A measure of the average sound pressure level during a period of time t in dB with A weighting Lar LaFmax LaFmin LaFreq Lar Latmax Laimin Las Lasmax Lasmin Lctmax Lcpeak Lcs Lcsmax Lep Leq Liegt Ln Lze Lzeq t Lzr LzrFmax CR 800B User Manual Page 57 Sound level with A Frequency weighting and Fast Time weighting The maximum Sound level with A Frequency weighting and Fast Time weighting The minimum Sound level with A Frequency weighting and Fast Time weighting Takt maximal sound level as defined by DIN 45641 Sound level with A Frequency weighting and Impulse Time weighting The maximum Sound level with A Frequency weighting and Impulse Time weighting The minimum Sound level with A Frequency weighting and Impulse Time weighting Sound level with A Frequency weighting and Slow Time weighting The maximum Sound level with A Frequency weighting and Slow Time weighting The minimum Sound level with A Frequency weighting and Slow Time weighting Sound E
20. supply When an external supply is connected the display of the instrument will show a symbol in the top right corner as shown below The CR 800B Series can be used with a UA 237 90mm Foam Windshield which will reduce the noise levels generated by air turbulence over the microphone capsule The windshield can also be used to protect the microphone capsule of the Sound Level Meter from dust and fluids which may affect the performance of the instrument To use the UA 237 Windshield push the hole in the windshield over the microphone of the Sound Level Meter The UA 237 Windshield must be removed before the Sound Level Meter can be calibrated NK 70 Random Incidence Adaptor The NK 70 Random Incidence Adaptor is designed to modify the response of the microphone capsule from Free Field to Random Incidence in order to comply with the requirements of ANSI 1 4 For instruments supplied for use outside of the USA this adaptor may not be supplied For further details please contact your local representative or Cirrus Research plc To fit the NK 70 Random Incidence Adaptor push the adaptor over the microphone grill Do not attempt to remove the microphone grill as this may cause damage to the capsule To calibrate the instrument fitted with the microphone capsule remove the NK 70 Adaptor and follow the instructions supplied with the instrument Do Not attempt to calibrate the instrument w
21. the PC ssssssssssssssesessem me ens memes mensem eene 49 Understanding how the measurements are stored s ss esse eee eee e e ee ee ee eee 51 Section 5 Maintenance amp Car ssc aza gea Y Rea aX d KaR 9 aZ R ASN R RRR KAYR ORSR N gR aSNK 53 Section 6 Troubleshooting ccccceccencenceneeeeeeeeeeeeeeeeeeseeseeseeeeeeeeeeeeeeeeeeeeeeeeeeneeeenaenaneaneas 54 je M 54 Galibrati m x ez 29 tsm 54 Measurements amp Settings iue wae ea tte eee eR ae vada ee Mew EAR Ves wale Cae Re EY gKR eir Man RR E RA 54 Downloading Measurements araneae Ie yT ea N C4 K R EA eee TR T R KN ERS SE eKA 55 Section 7 Glossary cseccensecesccencecussenseunensuscuuaeuseeseeceeeeseaseasesecesaeeneeansaunaeeaesuseunaeuaaeausas 56 Appendix 1 Menu Structure sssss sese sees sse sss ess resse enesenn ennenen ennenen enn annu 59 Appendix 2 Rating Plate I nformation ssssssessssesssees sse sse ees sees sees sees e nnn ennenen enne 61 Additional information etel ER IRR e la vance Coed Maes Leia dent eke 61 Additional filter informatio Mesire rstas apdet e n be ress A EEE GEEAE E 64 Appendix 3 Speciications ssees sse sss esse sse sse ennes e nenn ennenen ennenen ennan s 67 MemoLby 22 celeste lee bitin eeclesie yn als nate tid dias TR utate eese EL uds 69 Weight cc rrr ee n lees Palen a er ee et TR em ded lace ode gc yearend via e ROT X NEA 69 DIMENSIONS EUM 69 Batteries sva des HER pax Rex rena aad ache
22. the battery and operation of this unit Installing the software Before measurements can be downloaded from the CR 800B instrument the Deaf Defier3 software must be installed from the supplied CD Please refer to page 49 for further details of the installation of the Deaf Defier3 software Assembly The CR 800B instruments are supplied fully assembled apart from the MV 200C Preamplifier for Type 1 instruments and the batteries Preamplifier The Type 1 versions of the CR 800B CR 811B CR 821B and CR 831B are supplied with a removable preamplifier the MV 200C Also a removable preamplifier may be fitted as an option to the Type 2 instruments This preamplifier must be connected to the Sound Level Meter before the unit is switched on This unit is connected to the top of the CR 800B using a locking ring To connect the MV 200C Preamplifier follow the diagram below CR 800B User Manual Page 15 CO Q o Cirrus CR 800B 7 25 06 03 07 25 56 25 06 03 07 25 56 25 06 03 07 25 56 1 Drop the preamplifier into the socket on the Sound Level Meter 2 Ensure the connector has located into the socket 3 Tighten the Locking Ring Do not cross thread the locking ring Damage caused by misuse is not A covered by the warranty for the instrument Removing the Preamplifier Do not twist the preamplifier body Unscrew the locking ring and pul
23. your system adminstrator for further details To install the software insert the CD ROM into a CD ROM drive on the PC The installation program should automatically start If the installation program does not automatically start run D setup exe where D is the drive letter of the CD ROM drive on the PC System Requirements The Deaf Defier3 for Windows requires the following Microsoft Windows95 Windows 98 Windows 98 Second Edition Windows ME Windows NT Workstation 4 0 with service pack 6 Windows 2000 Professional with service pack 2 Windows XP Home Edition or Professional Internet access for downloading software updates 6Mb of available hard disk space for program files 64Mb RAM 128Mb recommended CD ROM Drive for Installation VGA or higher resolution monitor Super VGA Recommended Microsoft compatible mouse or pointing device 9 Pin RS232 Serial Port Installation Requirements Cirrus Research plc accepts no responsibility for the installation of the Deaf Defier3 software where the system requirements are not fully met and where the user does not have the correct configuration or access rights to enable the software to install correctly Microsoft is a registered trademark of the Microsoft Corporation Windows 95 Windows98 Windows ME and Windows XP are registered trademarks of the Microsoft Corporation Page 80 CR 800B User Manual Appendix 6 Configuring the instrument from the software The con
24. 0 02 07 03 05 08 35 Comments The User Metric setting of the instrument determines if the unit stores LAE LAIeq t or LAFTeq If the unit was in Overload or Under Range during the measurement this is indicated on the screen The whole measurement duration is displayed on the screen when the Time History data is reviewed Comments The graphical display of the 1 1 Octave Band measurement is shown with the measurement range shown on the left hand scale Page 46 Display Display Display Display Mem 12 Octave CR 800B User Manual Band 31 5 Hz 62 5 Hz 125 Hz 250 Hz 56 dB 52 dB 43 dB 54 daB 02 07 03 05 08 35 Mem 12 Octave Band 500 Hz 1 kHz 2 kHz 4 kHz 53 dB 49 dB 45 dB 99s dB 02 07 03 05 08 35 Mem 12 Octave Band 8 kHz 16 kHz 28 5 dB 34 7 dB 02 07 03 05 08 35 Mem 12 Octave Band A C Z 60 1 dB 54 4 dB 74 1 dB 02 07 03 05 08 35 1 3 Octave Band Measurements Key Press Display Mem 4 1 3 Octave 90 20 Mem 4 1 3 Octave 25 Hz 78 3 dB 31 5 Hz 84 2 dB 40 Hz 79 7 dB 50 Hz 80 4 dB 30 06 03 09 12 45 Comments The graphical display of the 1 3 Octave Band measurement is shown with the measurement range shown on the left hand scale CR 800B User Manual Page 47 Mem 4 1 3 Octave 62 5 Hz 78 3 dB 80 Hz 75 2 dB 100 Hz 74 9 dB 125 Hz 70 8 dB 30 06 0
25. 0 7b The filters are designed using switched capacitor filters preceeded by passive anti aliasing filters and followed by passive clock noise filters IEC1260 7c The filter centre frequencies are changed by application of a clock frequency that is one hundred times the selected centre band frequency IEC1260 7d The nominal midband frequencies for the octave filters are known as 31 5Hz 63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz 16000Hz The nominal midband frequencies for the third octave filters are known as 25Hz 31 5Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz 200Hz 250Hz 315Hz 400Hz 500Hz 630Hz 800Hz 1000Hz 1250Hz 1600Hz 2000Hz 3150Hz 4000Hz 5000Hz 6300Hz 8000Hz 10000Hz 12500Hz amp 16000Hz IEC1260 7e The filters are derived from the Base two formula Exact centre frequencies are 24 803Hz 31 250Hz 39 373Hz 49 606Hz 62 500Hz 78 745Hz 99 213Hz 125 00Hz 157 49Hz 198 43Hz 250 00Hz 314 98Hz 396 85Hz 500 00Hz 629 96Hz 793 70Hz 1000 0Hz 1259 9Hz 1587 4Hz 2000 0Hz 2519 9Hz 3174 8Hz 4000 0Hz 5039 7Hz 6349 6Hz 8000 0Hz 10079Hz 12699Hz amp 16000Hz IEC1260 7f The reference level range is the centre range 40dB to 110dB IEC1260 7g To facilitate testing the instrument is optimised at a level of 109dB on the reference level range ie one dB below top of range and generally about 2dB below overload IEC1260 7h The reference attenuation is OdB IEC1260 7i The linear operating
26. 110dB 14 07 03 15 25 03 To change the measurement range use the Up and Down Arrow keys to select the required measurement range and press OK Page 12 CR 800B User Manual Refer to page 35 for details of setting the measurement range and the use of the bar graph display in choosing the correct measurement range Change the measurement function To check the current measurement function and to change the measurement function press the menu key Use the Up and Down arrows keys to select the required measurement mode and OK to Select the mode required Key Press Display Comments CR 800B Menu In this example the instrument is Menu B set to Broadband Measurement Calibrate Mode Broadband Mode Y 1 1 Octave Mode 1 3 Octave Mode v Repv Syncv 00 15 00 CR 800B Menu Calibrate Broadband Mode 1 1 Octave Mode 1 3 Octave Mode wv Repv Sync 00 15 00 CR 800B Menu NEN 7 Calibrate Broadband Mode 1 1 Octave Mode 1 3 Octave Mode v v Repv Syncv 00 15 00 Start amp Stop the measurement To start the measurement press the Start Key Key Press Display Comments A Running lI Elapsed 00 08 23 Press the Up and Down arrow keys to view the measurement functions during the measurement CR 800B User Manual Page 13 To stop the measurement press the Stop Key Key Press Display Comments Mem 10 Broadband The instrument stores the a measurement in memory a
27. 3 09 12 45 Mem 4 1 3 Octave 160 Hz 64 6 dB 200 Hz 61 2 dB 250 Hz 60 7 dB 315 Hz 49 7 dB 30 06 03 09 12 45 Mem 4 1 3 Octave 400 Hz 55 3 AB 500 Hz 58 3 dB 630 Hz 58 7 dB 800 Hz 54 7 dB Mem 4 1 3 Octave 1 kHz 52 0 dB 1 25kHz 44 7 dB 1 6 kHz 46 5 dB 2 kHz 49 6 dB 30 06 03 09 12 45 Mem 4 1 3 Octave vB KHZ 49 6 dB 3 15kHz 46 5 dB 4 kHz 42 7 dB 5 kHz 32 3 dB 30 06 03 09 12 45 Mem 4 1 3 Octave 6 25kHz 28 6 dB 8 kHz 30 1 dB 10 kHz 26 3 dB 12 5kHz 20 5 dB 30 06 03 09 12 45 Page 48 CR 800B User Manual Mem 4 1 3 Octave 16 kHz 19 3 dB 65 0 dB 65 2 dB 92 2 dB 30 06 03 09 12 45 Checking amp Clearing the memory The memory of the instrument can be checked for available space and also to allow the user to delete the measurements that are stored To check the available memory select the Memory option from the menu Key Press Display Comments CR 800B Menu NEN 7 Menu Run Durations b Setup K Print Options Memory OK umm Available Memor Clear Memory Memory OK E O Measurement 99 Free Time History 63 Free To clear all the measurements from the memory use the Clear Memory option Key Press Display Comments Memory OK Available Memory Clear Memory CR 800B User Manual Page 49 Memor OK Y Confirm with OK Memory OK Memory Cleared Press Exit
28. 5 roaa r syr aen nda nana e a RE EY FR SERERE REX RR NEAR Ek Ra a de Eng Ka 2 17 sese 18 Checking the Configuration of the Instrument sse ee e e e e ee e eee eee eee eee eee 19 Time and Date cia coscesese ELE 19 MEASUFEMENE Range seien Y rn rn ee Y S COX AT NET naa AYER Y KEZ N S coh CNS KR KENT PROF REA KERN KR R a RAE ROME es cues 19 Measurement Mode e 2 2 292 noite eed Sese Z 9 25 temo ssepe Dec aeneae eMe RR Za anda Feb x RA i d aga Delete ved 20 Measurement Duratioh a rn o Ile e T SXT aA ERN HT ESA EI danas DA I es annie KC Ea 20 Measurement A to Repeat sisiran nenii rh nean E A nhan aA CTE a REA SERA a Ra E RR ARA EAR ANXN E RA RVR RR RR Riad 21 Measurement Auto SynNChroniS siira a cescices tnra E ne Rak aaa Rai Nana ra Van REM E Yan RA 21 Configuring the instrument from the Deaf Defier3 software sese eee e eee ee e K e e eee 21 CAliDFatiOn siczesss LEE 21 Starting a measurement era ee ERE cena PE RR E EM E A E EET raa EE ERr AR E RAE TRE one 23 Broadband ne Den 23 i IsOctave Band Mode 2 1 eter eoo a Ede tr pe Cased HET 23 1 3 Octave Band o ele rete Rot ere ui umen IR I DRM DR DM RAM ad EDUMDANDR Ro aw had ETAPA TE 24 Displaying the data during a measurement sss see eee ee e e e e ee e e e e e ee eee 25 Broadband Mode T TT eae 25 Pausing and Resetting a measurement cece ee e e e e ee eee ee een e eee e men men sene nne 26 Stopping the measurement sssssssssessseeseee nennen nenne nnne nua sea a rea ann
29. 50dB to 120dB 40dB to 110dB 25 06 03 07 25 56 The diagram above shows how the bar graph will show where the noise level is placed within the selected measurement range Select the appropriate measurement range to suit the noise levels to be measured CR 800B User Manual Page 37 Instrument Setup Select the Setup option from the main menu and press OK Key Press Display Comments CR 800B Menu NEN 7 OK Run Durations K Memory K Print Options v Repv Syncv 00 15 00 Display Contrast To adjust the contrast of the display select the Contrast Option and press OK Key Press Display Comments Setup Set Clock gt Cal Level Resolution v Repv Syncv 00 15 00 Contrast Select the Lighter or Darker option To o B HM and press the OK repeatedly to adjust the selection Darker Press the Exit button to exit from the Contrast menu Repv Syncv 00 15 00 Page 38 Time amp Date CR 800B User Manual To change the Date and Time select the Set Clock option from the Setup Menu Key Press Display Setup L Contrast K Set Clock K Cal Level Resolution v Repv Syncv 00 15 00 Set Clock OK Date RepY Syncv 00 15 00 Set Clock Time 00 01 00 hh mm ss Set Clock OK Time Repv Syncv 00 15 00 Set Clock Date 29 06 03 dd mm yy Calibration Level Comments To set the Time
30. 800B User Manual Page 59 Appendix 1 Menu Structure The structure of the menu system of the CR 800B Sound Level Meter is shown below for reference CR 800B Menu Broadband Mode 1 1 Octave Mode 1 3 Octave Mode 1 Octav 1 3 Octave Mode CR 800B Menu Calibrate 1 3 Octave Mode 00B Menu Calibrate Broadband Mode 1 1 Octave Mode 1 3 CR 800B Menu 3 Run Duration Memory Setup gt Print Options 5 minutes 10 minutes Run Duration Set User Time Auto Repeat gt Run Duration Run Duration Synchronise K Time 00 01 00 hh mm ss Run Duration a Auto Repeat Auto Repeat User Defined Set User Time K Synchronise usos 2n Set Number K Set Number go Synchronise Run Duration User Defined Set User Time gt Auto E K CR 800B Menu Memory Memory Run Durations K ail Measurement Clear Memory 99 Free Setup gt Time History Print Options 63 Free Memory Memory Memory Memory Cleared Press Exit Key Page 60 CR 800B User Manual CR 800B Contrast Run Durations Memory Set Clock gt Darker up K Cal Level Print Options Resolutio setup Set Clock Set Clock Time Cal Level Res
31. C output DC log signal of the above with time constant as selected DC Output Level Top of Range value 33dB 41 giving approximately 24 4mV dB DC Output is affected by Measurement Range Time Weighting Frequency Weighting Output Impedance DC Output AC Output 10K 10K in series with 33uUF Optimum Load 21M 21M inF 470pF AC amp DC Outputs should be loaded by an impedance exceeding 10k 1M Recommended Output Cables RS232 ZL 800 RS232 Cable to 9pin Female DIN ZL 803 Serial Printer Cable to 9 pin Male DIN AC Output ZL 802 2m to 3 5mm Stereo Jack ZL 804 2m to Male BNC DC Output ZL 805 2m to Male BNC Converter Cable 0 1v DC Output External Power 12v 16 5v DC 100mA CU 195A Mains Power Supply Optional Specify UK US or EU Type Plug Software Support Deaf Defier3 for Windows System Requirements The Deaf Defier3 for Windows requires the following Microsoft Windows 95 or later 6Mb of available hard disk space for program files CD ROM Drive VGA or higher resolution monitor Super VGA Recommended Microsoft compatible mouse or pointing device 9 Pin RS232 Serial Port PC specification Minimum PII 266 MHz Recommended PIII 500 MHz For Computers without a free RS232 Serial Port a USB Serial or PC Card Serial Adaptor may be used to allow communication with the instrument Factory Options MO 800 1 Upgrade from Type 2 to Type 1 MO 800 2 Upgrade from Broadband to 1 1 Octave Band Filters MO 800 3 Upgrade from Br
32. CR 800B User Manual Page 1 User Manual for the CR 800B Series of Sound Level Meters y Cirrus Research plc dedicated to noise measurement This manual the software to which it relates the program code and drawings are all Copyright Cirrus Research plc 1989 2007 Page 2 CR 800B User Manual The content of this manual any illustrations technical information and descriptions within this document were correct at the time of going to print Cirrus Research plc reserves the right to make any changes necessary without notice in line with the policy of continuing product development and improvement No part of this publication may be duplicated reprinted stored in a data processing system or transmitted by electronic mechanical photographic or other means or recorded translated edited abridged or expanded without the prior written consent of Cirrus Research plc No liability is accepted for any inaccuracies or omissions in this manual although due care has been taken to ensure that is it complete and accurate as possible Accessories supplied by Cirrus Research plc have been designed for use with the instrumentation manufactured by Cirrus Research plc No responsibility is accepted for damage caused by the use of any other parts or accessories In order to take account of a policy of continual development Cirrus Research plc reserves the right to change any of the information contained in this publication without prior notice
33. Calibration Level MK 202 0 3dB 93 7 dB MK 215 0 3dB 93 7 dB MK 216 0 3dB 93 7 dB MK 226 0 3dB 93 7 dB MK 224 0 3dB 93 7 dB B amp K 4134 OdB 94 0 dB B amp K 4180 OdB 94 0 dB B amp K 4192 OdB 94 0 dB Example An example of the procedure used to calculate the value for an MK 224 microphone is shown below Level 94 0dB Microphone Correction Level 94 0dB 0 3dB Level 93 7dB Different microphones will have different correction values Please check the operation manual for the Sound Level Meter or microphone concerned for details CR 800B User Manual Page 79 Appendix 5 Software Installation The CR 800B Series are supplied with the Deaf Defier3 software on a CD ROM Deaf Defier3 is suitable for PC s running Microsoft Windows 95 or later including WindowsXP and Windows2000 Deaf Defier3 is supplied on CD ROM with a full installation program and comprehensive on line help which gives details of the options and functions of the software along with details of the calculations used in the Hearing Protector Selection Report software may need to install additional components to enable the database to function correctly These components are included with the installation program Please note that for PC s running Windows 95 98 and 98SE the Deaf Defier3 Please also note that full adminstrator access may be required to install the A Deaf Defier3 software under WindowsXP Windows2000 or WindowsNT Contact
34. Key Exit A Please note that when the memory has been cleared any measurement previously stored cannot be retrieved and are permanently deleted Downloading Measurements to the Software Before measurements can be downloaded the software must be installed on to a suitable PC Software Installation The Deaf Defier3 software must be installed before measurements can be downloaded Please refer to page 79 for details of the installation of the Deaf Defier3 software Connecting the instrument to the PC The CR 800B instruments connect to the PC using the supplied ZL 800 RS232 Cable This connection requires a free 9 Pin RS232 Serial port on the PC If no RS232 port is available a USB Adaptor ZL 101 is available as a cost option Please contact your local representative or Cirrus Research plc for further information Page 50 CR 800B User Manual Connect the ZL 800 Cable to the RS232 socket 2 in the diagram above on the bottom of the instrument Ensure that the cable is inserted correctly with the arrow on the top of the connector Do not force the connector into the socket as this may cause damage Connect the 9 Pin DIN socket to a free RS232 socket on the PC When the Deaf Defier3 software is installed and run use the Download option to connect to the instrument The Deaf Defier3 software will automatically detect the CR 800B instrument and allow measurements to be downloaded Please refer to the Help pro
35. RN ree ec A E edema neha gained ni AT a re E Va al 74 CR 800B User Manual Page 5 Changing the Battery eir re Reb rar turco satin DERE iEn male Res n eR FT RE a de Pda ud 75 Battery CY DG ex TN 9 YX e ena en reri ve e conve sale n ena a a ate ELA WR EVERY RARE DAR VEN YER AERE REN RA KE RN DA VAY veda Dna 75 Tela l a el aep E 76 Technical Information ee 77 Free Field Correction eene eet een n exe ere e RE D NER ex Ue E ia AEAN AARAA nga exten 78 Microphone Correction Valles cYa s 499 esses nena e page s su apa sho R rusa ka Dirada Taraa SERERE E RR RERR eds vented 78 SCIPUIEENIMEILIIILICELDIUCILD III 78 Appendix 5 Software Installation sssssssessssessssessssessseesssressnresnn resne ennenen nenn ees 79 System Requirements TTT 79 Installation Requirements ssi iisa ssiis iiia ninri rinnast enne nnne nnns ases ases aan rna ana rennen 79 Appendix 6 Configuring the instrument from the software eee 80 Appendix 7 CE Certificate of Conformity sssssssssss sese sees sese sse e sse eenn eenn ennenen enne ens 81 Warranty Il nformation eeeeeeeeeeeen enne nne n nennen nenne annu nn annus u sunu umana uuum u nan nnns 82 Cirrus Research Offices kuaiap aaae aa NR aaao iaa aae i aaia 83 Page 6 CR 800B User Manual Preface Thank you for purchasing the CR 800B Sound Level Meter This powerful instrument provides excellent expansion capability and has been designed to provide reliable accur
36. Research plc Acoustic House Bridlington Road Hunmanby North Yorkshire YO14 OPH United Kingdom Telephone 44 1723 891655 Equipment Description The following equipment manufactured after 1 January 2007 CR 811B Sound Level Meter CR 812 Sound Level Meter CR 821Sound Level Meter CR 822Sound Level Meter CR 831Sound Level Meter CR 832Sound Level Meter CR 514 Acoustic Calibrator CR 515 Acoustic Calibrator Along with their standard accessories According to EMC Directives 89 336 EEC and 93 98 EEC meet the following standards EN 61000 6 3 2001 EMC Generic emission standard for residential commercial and light industrial environments EN 61000 6 1 2001 EMC Generic immunity standard for residential commercial and light industrial environments Signed Dated 1 January 2007 St S O Rourke Director Page 82 CR 800B User Manual Warranty Information 1 This document is a summary of the full warranty document and explains the Cirrus Research plc warranty in ordinary English not in legal or complex terms 2 The warranty covers any acoustic instrument such as a sound level meter acoustic calibrator real time acoustic analyser or personal sound exposure meter dosemeter manufactured by Cirrus Research plc after March 1st 2007 3 The warranty covers all faults on the instrument except the microphone and the display for the period defined in para 4 below including minor accidental damage except to the mic
37. S1 4 for Random Incidence microphone response an NK 70 Random Incidence Adaptor should be used when making measurements Please refer to page 17 for details of the use of the NK 70 Random Incidence Adaptor Messages and Symbols Messages are used in this manual to bring important information to your attention The different message types are indicated as shown below failure to follow instructions may cause data loss or may damage the Pay attention A caution informs you that improper use of the equipment or equipment Please read A note is a hint or advice that helps you make best use of the equipment and accessories CR 800B User Manual Page 7 Section 1 Introduction Main Features Measurement Functions The measurement functions that can be provided by the CR 800B depend upon the options that have been fitted If the instrument has been fitted with the 1 1 Octave Band or the 1 3 Octave Band filters these measurements will be available Listed below is a summary of the measurements that can be provided by the basic Broadband instrument and by the addition of the 1 1 Octave Band or the 1 3 Octave Band filters If the Auto Repeat function is used the CR 800B can be made to repeat the broadband measurement up to 999 times See page 21 for details of setting the auto repeat function The instrument can also be configured to synchronise the measurement start time with the instrument clock See page 21 for details of the Auto Sy
38. ZL 803 ZL 804 ZL 806 ZL 807 Acoustic Calibrator Acoustic Calibrator with PTB Type Approval Class 1 Acoustic Calibrator Barometer for use with CR 511F Acoustic Calibrator Windshield Carrying Case Carrying Pouch for Sound Level Meter Tripod Preamplifier Tripod Mount 2m Microphone Extension Cable 5m Microphone Extension Cable 10m Microphone Extension Cable 25m Microphone Extension Cable Outdoor Measurement Kit Lightweight Outdoor Measurement Kit Mains Power Supply UK US EU Deaf Defier3 Software Printer Cable for Serial Printer AC Output Cable to BNC Connector 2m 12v Power Cable for CR 800B amp CR 800B Series 2m 2m AC Output Cable to BNC CR 800B User Manual Page 9 Section 2 Getting Started How to These example settings are designed to demonstrate the different configurations that are available from the CR 800B Sound Level Meters Please check the configuration of the instrument to match the measurement requirements of your application before making a measurement Make a 15 minute Broadband Measurement 1 Switch on Calibrate Set Measurement Mode to Broadband Set measurement duration to 15 minutes Switch off Auto Repeat amp Auto Synchronise Set Measurement Range Start Measurement a Run for 15 minutes Stop Measurement Review Measurement Data DHOOT IT Id wo Make a 1 1 Octave Band Measurement over 1 minute 1 Switch on Calibrate Set Measurement Mode to 1 1 Octave Band Set Measu
39. a nna nasa nnn 26 Viewing the stored measurements se ee ee e e eee ee ee eene sense men messessee seen nenne 27 After a measurement has been stopped cs scs s vvar caset e aar vraga 9 inns ak hae d ek nna ga gd RAR R taa a Ra YR nga 27 Recalling Stored measurements eines 5 05 X 924 99 vi N sealed xag 9 9 e sua PIANA Sane ps IRR 9 Ra a aa E e eR FR npa uan 27 Section 3 Configuring the Sound Level Meter eese esee enn enne enne 28 Key Pais iie tec a ete viam Ae DE Te cue Ru oa TE Shaman hanes 28 Menu SYSTEM yorisan eir enen AREAIS POSTRA SIR Dr ve n QUERI IUE EDO ohne es TEOR PRSE UE ped ErE E 28 Measurement Mode aa nata A ye x RR RT ER ERR ag teste RRE ERRREFRYRARRRTRPERERE ER UA RENE KAUDEN A LA 29 S Tgerz o arz imeem 29 1 f Octave Band M de eere ir d roca oru t OR EAEE ER DIESE RR E OPERE See RER POEMAS DRE pear REA 30 1 3 Octave Band Mode he dtu aeree Re c aire ia dis a DE REN ba Sadie MER RR D dn 6 30 Page 4 CR 800B User Manual Measurement Duration ere aa 9 ra 33 x este Ea NO FURY NR SNE a TREES a NEN NN RL NT Aarah 31 Measurement Auto Repe8at eere ea exer rere xx REX EX E ERR UEFA RA ER EE ee Meals 33 Measurement Auto Synchronise ooo nenne enema nnn nana nnn nn 34 Measurerment Ranges irris tee rex Ren Duke x E Rete TRR Yaa a TITRES EE DERE EF EN UE E REY hacer FREE ed 35 Instr ment Setup z RE i REO E dade d ERN EX E IE D RERIT ENI TEEPEE E TE ls 37 Display Contrast ioci xt ei gie Nt ttu ad
40. asurement information and restart the measurement Stopping the measurement CR 800B User Manual Page 27 At any time during a measurement the user can stop the measurement The data will be automatically stored in memory and the display will change to the memory review mode Key Press Display Comments Running 58 6 2 Elapsed 00 08 23 Mem 10 Broadband When the Stop key is pressed the ag current measurement is stored in Elapsed 00 15 00 the memory and the display LAeqt 53 5 dB changes to the memory review LCpeak 95 0 dB mode LAE 82 9 dB In this example the measurement 30 06 03 11 12 07 is a Broadband measurement Viewing the stored measurements After a measurement has been stopped When the measurement is stopped the data is automatically stored in memory and the instrument enters the measurement review mode Use the Up and Down arrow keys to review the measurement data Refer to page 44 for details of reviewing measurements Recalling stored measurements Measurements can be recalled at any time to the instrument display Refer to page 44 for details of recalling measurements Page 28 CR 800B User Manual Section 3 Configuring the Sound Level Meter This section of the manual covers the configuration of the Sound Level Meter and the different options that are available to the user Keypad 1 13 2 12 3 11 4 Exit wW Reset Oo janmo 9 6 8 T 1 Move through the mea
41. ate measurements over a long period of time This manual describes the procedure that should be followed to set up and operate the CR 800B Sound Level Meter as well as comprehensive technical information using optional accessories as well as troubleshooting This manual also contains the information regarding the CR 514 and CR 515 Acoustic Calibrators which has been supplied previously as a separate manual If you are a new user of Sound Level Meters or new to the CR 800B Sound Level Meter first read Section 1 Introduction to familiarise yourself with the features components and accessories supplied Then read Section 2 Getting Started for step by step instructions on how to use the instrument The different versions of the CR 800B are CR 811B Type 1 Broadband Only CR 812B Type 2 Broadband Only CR 821B Type 1 Broadband with 1 1 Octave Band Filters CR 822B Type 2 Broadband with 1 1 Octave Band Filters CR 831B Type 1 Broadband with 1 1 amp 1 3 Octave Band Filters CR 832B Type 2 Broadband with 1 1 amp 1 3 Octave Band Filters The CR 800B Sound Level Meters meet the requirements for Type 1 and Type 2 Sound Level Meters according to IEC 60651 and 60804 depending upon the version of the instrument They also meet the new IEC 61672 1 2003 standard for Class 1 Group X or Class 2 Group X Sound Level Meters as appropriate Please refer to page 67 for full technical details of the CR 800B Sound Level Meters To meet the requirements of ANSI
42. bration level on the Acoustic Calibrator is set to the correct level The default level is 94dB CR 800B User Manual Page 23 CR 800B Menu The calibration level is unstable RE Unstable The background noise level may Not Calibrated be too high or the Acoustic Calibrator may not be fitted correctly to the Sound Level Meter Press Exit key Refer to the troubleshooting section on page 54 for further information Starting a measurement Broadband Mode Key Press Display Comments gt Running LzZF 55 4 When the measurement is Al M running the display shows Running in the top left hand 50 4 l Elapsed 00 01 If the user does not stop or reset the measurement the instrument will run for the preset measurement duration At the end of the measurement the information will be automatically stored in the memory If the Auto Repeat function is enabled the next measurement will start automatically at the end of the previous measurement 1 1 Octave Band Mode Key Press Display Comments Running LZF 55 4 ff When the measurement is Al H running the display shows Running in the top left hand 56 4 77 Elapsed 00 01 If the measurement duration is set to Manual the 1 1 Octave Band frequency will stay on the current frequency until the Up arrow is pressed At the end of the measurement the user must press the Stop key to end the measurement and store the information in the
43. can be stored depends upon the duration of the measurement The table below shows the maximum time over which measurements can be made Please note that this applies only to Broadband Measurements using the Auto Repeat function Measurement Duration Maximum Length of Measurement 1 minute 21 5 hours 5 minutes 4 5 days 15 minutes 13 5 days 30 minutes 27 days 1 hour 54 days With each Broadband Measurement is also stored a Time History measurement This information is stored in a separate memory from the Events and does not take up any of the 1 300 Event memories However the Time History memory is limited to a size of 1 008 000 samples at 1 second samples which is just over 11 days of data storage If the Time History Store is full before the Event Memory Store the Event measurements will continue but will not have Time History data Page 52 The diagram below shows an example of this Memory LY 5 Minute Broadband Measurement 5 Minute Broadband Measurement 5 Minute Broadband Measurement 5 Minute Broadband Measurement 5 Minute Broadband Measurement 5 Minute Broadband Measurement 5 Minute Broadband Measurement NV M Time History NV M Time History NV M Time History S AA NM Time History quA NV M Time History NV Time History NV M Time History JT gt CR 800B User Manual Memory 1 Hour Broadband Measurement 1 Hour Broadband Measuremen
44. dB and the pulse exceeds 73dB except for the lowest range where the linearity and pulse range are reduced by 5dB due to the higher noise floor IEC804 11 2 7 IEC651 11 2 4 The reference sound pressure is 1 Pa 94dB IEC804 11 2 5 The integration periods can be set to any period from 10sec to 99hours or use the preset values of 5min 10min i5min 30min ihr 8hrs andi2hrs IEC651 11 2 5 The nominal frequency weighting characteristic for measurements apart from Peak is A weighting Peak has a fixed C weighting A C or Z weighting for the other channel can be selected although this selection will also apply to the Leq measurements at the same time Z weighting has an electrical design centre of 8Hz to 20kHz 0 2dB 0 5dB on all ranges IEC651 11 2 6 F S and I responses are fitted with a Maximum Hold on the max RMS value of each This parameter can be read when the unit is in a run mode Peak is fitted on an independent C weighted channel IEC804 11 2 9 IEC651 11 2 7 An acceleration of 0 1g over the frequency range 63 4kHz results in a reading of less than 50dB on any axis or weighting IEC804 11 2 10 IEC651 11 2 8 1 oersted produces a reading of less than 50dB on any weighting IEC804 11 2 11 IEC651 11 2 9 The units operate from 10 degree C to 50 degree C with a maximum reading change of 0 5dB but is typically less than 0 3dB IEC651 11 2 10 We recommend that the operator should be at least 1m from the microphone dur
45. e dence ii Rd aa KD e sa IA TRAE hate 37 Time amp Date ooo ean deux a REY rre e En Ee nete ann existe vn ker E Eb Wav ERN ER wide Dr RE Pe YI re RE Le rie ro Rena 38 Calibration eyel L mEEEDVTET 38 Display Resolution cr is nee dh one pede dec Ea 0 052 9 Re RR EEEIEE KAL Xy ETRE RIA RARIRTRAPRBRAYN ia As 39 Time Weighting a sia Yaa E 40 Frequency Weightin Gz i dete eite sanie iex dure tante e ee Rieti eR MER one E radon ue daddies 41 ERE 1 NC EE CenveeuaG Oeste ey 41 WSO MEUM GC wit sates DEM T M IPTE 42 Configuring the instrument from the Deaf Defier3 software sese e ee e e e e e cent etre eee teen eaten teens teenies 43 Section 4 Viewing and Downloading the measurements eese 44 Recalling Stored Measurements ssssssssssssssssesss ses esee messes sense nemen men seen nne 44 Broadband Measurement erii oer ZC irah cd 9 09 2 dna Mum repa dra xA eus ape bs sape Rae daa von CoU Ue ee eG ao Ra alee eee 45 1 1 Octave Band Measurements cisci C2 T N cX OR hase na aad a naa Ey a RR IK RR re NO Ra BE ERR ida FEN Ra RR 4 45 1 3 Octave Band Measurements cce sese ee eee eee 46 Checking amp Clearing the memory s esec eee e e ee ee e e ee ee K ee eem emnes emen essen sene nenne 48 Downloading Measurements to the Software cceeeee eee ee ee e eee eee eee neta eens mensem 49 Software Iristallatiort i rii edoctus ARA EA aAa Rehd E ETT RII DES Stet hance ERA LESE 49 Connecting the instrument to
46. elve years from the date of purchase 12 Cirrus Research endeavour to ensure stocks of instrument components for the full twelve year period but do not guarantee to do so as certain components do become obsolete or discontinued 13 If a sub component becomes obsolete and stocks are depleted then Cirrus Research will endeavour to facilitate a repair but will not offer the same length guarantee 14 In the event of any dispute on the terms of the warranty Cirrus Research plc will accept pendulum arbitration by the United Kingdom Institute of Acoustics Ltd 15 The warranty does not in any way reduce any legal right of the buyer or user of the sound level meter it is in addition to all legal rights determined by the European Union CR 800B User Manual Page 83 Cirrus Research Offices The addresses given below are the Cirrus Research plc offices Cirrus Research plc also have approved distributors and agents is many countries worldwide For details of your local representative please contact Cirrus Research plc at the address below Contact details for Cirrus Research authorised distributors and agents are also available from the Internet Web site at the address shown below Main Office Cirrus Research plc Acoustic House Bridlington Road Hunmanby North Yorkshire United Kingdom YO14 OPH Telephone 01723 891655 Fax 01723 891742 e mail sales cirrusresearch co uk Technical Support support cirrusresearch co uk Web Site www c
47. ets the requirements set out in IEC651 IEC1260 7s The CR 800B will indicate when a low battery condition is approaching or has been exceeded IEC1260 7t The filter is integral to the CR 800B IEC1260 7u The instrument is fully functional 10 seconds after switch on but a one minute wait is preferable for best accuracy IEC1260 7v Consult Cirrus Research plc CR 800B User Manual Page 67 Appendix 3 Specifications Instrument Versions CR 811B Type 1 CR 812B Type 2 CR 821B Type 1 with 1 1 Octave Band Filters CR 822B Type 2 with 1 1 Octave Band Filters CR 831B Type 1 with 1 1 amp 1 3 Octave Band Filters CR 832B Type 2 with 1 1 amp 1 3 Octave Band Filters Applicable Standards Sound Level Meter IEC 60651 1979 Type 1 I or Type 2 I IEC 60804 1985 Type 1 or Type 2 IEC 61672 1 2003 Class 1 or 2 Group X ANSI S1 4 with NK 70 Random Incidence Adaptor Fitted 1 1 amp 1 3 Octave Band Filters where fitted IEC 61260 Class 1 Microphone Type 1 MK 224 pre polarized Free field 12 Condenser Type 2 MK 216 pre polarized Free field 2 Condenser Random Incidence to ANSI S1 4 with NK 70 Adaptor Capacitance 18pF Microphone Preamplifier Type 1 MV 200C Removable Preamplifier Type 2 MV 200C Integral Preamplifier Extension cables ZL 202 2m ZL 205 5m ZL 210 10m ZL 215 15m ZL 220 20m ZL 225 25m Time Weightings FY Fast to IEC 61672 1 2003 Class 1 or 2 Group X S Slow to IEC 61672 1 2003 Class 1 or 2 Group X T Impulse to IEC
48. ever be at the side or in front of the unit IEC804 11 2 18 IEC651 11 2 17 Apart from the microphone and pre amplifier no other device needs to be attached to make complete measurements IEC804 11 2 19 IEC651 11 2 18 The limitations on the electrical impedance that may be connected to the optional outputs Any real positive impedance of zero ohm upwards Optimum load impedances are specified in this manual No guarantee on performance can be made if non Cirrus supplied cables are used IEC804 11 2 6 IEC651 11 2 19 The reference frequency used for calibration is 1kHz IEC804 11 2 8 IEC651 11 2 20 The reference range for IEC 651 purposes is centre range from 40dB to 110dB IEC804 11 2 20 IEC651 11 2 21 The warm up period is less than 10 secs although it is recommended that the unit should be switched on for at least one minute before calibration to provide optimum accuracy Never Page 64 CR 800B User Manual attempt calibration of an instrument that has not stabilised in temperature with its surroundings if you are seeking accurate results IEC804 11 2 21 The settling time before valid Leq readings of constant signals are within 0 5dB of their final reading is 10secs and within 0 1dB within 1minute IEC804 11 2 22 The battery life is greater than 20 hours with continuous use for average readings at 20dB below top of scale and at reference conditions This value will vary dependant on the quality of the Alkaline batteries used and
49. figuration of the instrument can be set from within the Deaf Defier3 software Different configurations can be saved and loaded into the instrument to suit different measurement applications and standards The following parameters can be set from within the Deaf Defier3 software Measurement Mode e e Run Duration e Time Weighting e Frequency Weighting e Measurement Range e User Metric e Measurement Auto Synchronisation e Measurement Auto Repeat e Ln values Instrument Configuration BI x Instrument CR 800B Computer clock Clear Memory Serial number 00000000 24 07 03 22 28 51 A ose Firmware version 03 00 17 Instrument clock Set Calibration due 09 07 04 24 07 03 22 21 20 E Advanced Instrument Setup SeupNam sd Filter Mode Broadband Run Duration 5 minutes E Curent Setup Time Weighting Fast e UserTime 0007 00 m 15 Minute Measurements iu 1 Minute Measurements Freq Weighting A Synchronise Jon Level Range 40 to 110 Auto Repeat Jon No 333 User Metric ino change Lr 1 x 1 Setup Notes These are the instrument s current settings xl zi New setup Delete setup Send setup tolnstrument For full details please refer to the Deaf Defier3 software help CR 800B User Manual Page 81 Appendix 7 CE Certificate of Conformity Cirrus Research plc Hunmanby UK CE Certificate of Conformity CE Manufacturer Cirrus
50. hen the instrument is set to either 1 1 or 1 3 Octave Band Mode the Run Duration is divided between the frequency bands For example if the measurement duration is set to 15 minutes the CR 800B instrument will take a total of 15 minutes to complete the sweep through the frequency bands To meet the accuracy required by the standards to which the instrument is designed to meet there is a minimum time required to measure each frequency band Therefore the CR 800B enforces a minimum measurement duration of 1 minute for the 1 1 Octave Band Mode and 3 minutes for the 1 3 Octave Band Mode CR 800B User Manual Page 21 Measurement Auto Repeat Key Press Display Comments Cirrus CR 800B NEN 7 97 0 25 06 03 07 25 56 CR 800B Menu The status of the Auto Repeat is Menu 3 shown at the bottom of the Sereen Broadband Mode Y 1 1 Octave Mode In this example the Auto Repeat 1 3 Octave Mode is switched on v RepY Syncv 00 15 00 When the Auto Repeat is switched off the display is Repx Measurement Auto Synchronise Key Press Display Comments Cirrus CR 800B a 25 06 03 07 25 56 CR 800B Menu The status of the Auto Menu Synchronise is shown at the bottom of the screen Broadband Mode Y 1 1 Octave Mode In this example the Auto 1 3 Octave Mode Synchronise is switched on wv RepY Syncv 00 15 00 When the Auto Synchronise is switched off the display is Syncx Configur
51. ing measurement CR 800B User Manual Page 63 IEC804 11 2 12 IEC651 11 2 11 The unit will meet its specification at any humidity from 0 to 95 RH IEC804 11 2 13 IEC651 11 2 12 Maximum storage temperature of 60 degree 50 degree extended period and 50 RH should be observed Care should be taken when taking an instrument rapidly from sub zero temperatures to room temperature or above as condensation can take place inside the instrument and temporarily affect accuracy No long term damage should take place however IEC804 11 2 14 IEC651 11 2 13 Use of a ZL 202 2m ZL 205 5m or ZL 210 10m extension cable will not affect the calibration IEC804 11 2 15 IEC651 11 2 14 The UA 237 windscreen has a small effect on frequency response as follows Up to 1kHz no effect 1259Hz 0 1dB 1585Hz 0 2dB 1995Hz 0 3dB 2512Hz 0 3dB 3162Hz 0 3dB 3981Hz 0dB 5012Hz 0 1dB 6310Hz 0 1dB 7943Hz 0dB 10000Hz 0 2dB 12590Hz 0 7dB IEC804 11 2 16 IEC651 11 2 15 The use of a pistonphone PF 101C is recommended to ensure long term compliance but for general short term compliance the CR 511F is used They should be returned to the factory annually to be checked against a secondary or transfer standard Any corrections specified in the calibrator or pistonphone manual should be applied for temperature or barometric pressure variation IEC804 11 2 17 IEC651 11 2 16 The observer should be behind the case for optimum results The operator should
52. ing manual supplied with the Acoustic Calibrator to be used for details of the correction required for use with an MK 224 or MK 216 Microphone Capsule Display Resolution The display resolution of the CR 800B instruments can be set to be either O 1dB or 0 01dB For most applications the 0 1dB resolution is standard Key Press Display Comments Setup Contrast K Set Clock K Cal Level wv Repv Syncv 00 15 00 Page 40 CR 800B User Manual Resolution Use the Up and Down arrows keys OK to select the display resolution High 000 00 and press OK to select the Norm 000 0 required display resolution Press Exit to return to the main display RepY Syncv 00 15 00 Time Weighting The Time Weighting of the instrument can be set to either Fast Slow or Impulse To set the Time Weighting select the Time Weighting option from the menu Key Press Display Comments Setup Freq Weighting Change Ln Values User Metric v Repv Syncv 00 15 00 Time Weighting Select the required Time Weighting and press OK to select Slow The select Time Weighting is Impulse indicated by a tick OK Press Exit to return to the main RepY Syncv 00 15 00 display The Time Weighting applies to the following parameters Broadband Mode Lar Las Lar Lcr Lcs Lcr Eze Lzs or Lz not stored LaFmax LASmax Latmaxs Lcrmax Lcsmax Leimax Lzrmax Lzsmax or Lzimax LaFmin LASmin Latmin
53. ing the instrument from the Deaf Defier3 software The entire configuration of the instrument can be set from the Deaf Defier3 software using the Advanced Configuration option Please refer to page 80 for details of this function Calibration If a microphone extension cable is to be used during a measurement the instrument must be calibrated with the cable attached Page 22 CR 800B User Manual Attach the Acoustic Calibrator to the Sound Level Meter and press the menu key The first menu option is Calibrate Key Press Display CR 800B Menu NEN 7 Broadband Mode Y 1 1 Octave Mode 1 3 Octave Mode Menu v Repv Syncv 00 15 00 CR 800B Menu NEN 7 Calibrating Please wait CR 800B Menu NEN 7 Calibrated to 93 7 dBA Press Exit key Comments Select 94dB on the Acoustic Calibrator before starting the calibration procedure If the calibration is sucessful the instrument will display the calibration information screen Press Exit to return to the main screen If the instrument cannot calibrate successfully the display will show an error CR 800B Menu NEN 7 Too Low Not Calibrated Press Exit key CR 800B Menu NEN 7 Too High Not Calibrated Press Exit key The calibration level is too low The Calibrator may not be switched on or may not be functioning correctly The calibration level is too high Check that the cali
54. irrusresearch co uk Germany Cirrus Research Buro Dresden Schlueterstrasse 29 01277 Dresden Germany Telephone 49 351 316 0950 Fax 49 351 316 0949 e mail verteib cirrusresearch de Website www cirrusresearch de
55. ith the NK 70 fitted Page 18 CR 800B User Manual Switching On Key Press Display D l Cirrus CR 800B yacrvs 07 Oy CR 800B v3 00 dB 25 06 03 07 25 56 When the instrument is first switched on a Welcome screen is shown with the instrument type and version number After 3 seconds the display will change and the current Sound Level will be shown with the current configuration shown as above In this example the instrument is showing the Fast A Weighted Sound Level with the current Date and Time shown at the bottom of the screen The battery level is shown in the top right hand corner of the display Across the top of the display above the numbers is shown the sound level as a bar graph This graph is scaled with the current measurement range Please refer to page 35 for details of changing the measurement range The display will also show the battery level and when the instrument is in Overload or Under Range The Glossary on page 56 also describes the indication of Overload and Under Range Cirrus CR 800B 0 Cirrus CH 800B Cirrus CR 800B NEN 7 UJ UJ 97 0 x 97 0 v 97 0 r 25 06 03 07 25 56 25 06 03 07 25 56 25 06 03 07 25 56 Low Battery Level Overload Under Range CR 800B User Manual Page 19 Checking the Configuration of the Instrument The Setup of the instrument should be checked before making a measurement Time and Date Key Press Display
56. l the preamplifier from the Sound Level Meter Page 16 CR 800B User Manual Using Microphone Extension Cables The CR 800B instruments can be used with a microphone extension cable if the instrument is fitted with the removable preamplifier If a microphone extension cable is to be used during a measurement the instrument must be calibrated with the cable attached Connect the microphone extension cable in the same manner as the MV 200C Preamplifier Batteries The batteries of the CR 800B are located behind the cover on the bottom of the instrument Slide the cover to the right hand side to remove and to access the battery holder Ensure the instrument is switched off Remove the battery holder from the instrument and insert the batteries The CR 800B instruments uses two AA type batteries also known as LR6 1 1 Batteries 2 RS232 Communications Socket 3 External Power Ensure that the batteries are inserted correctly DO NOT reverse the polarity A of the batteries as this may cause damage to the instrument CR 800B User Manual Page 17 Using an external power supply 25 06 03 07 25 56 Windshield The CR 800B can be used with an external power supply When the external supply is connected the CR 800B switches automatically from the internal battery power When the external power is either removed or switched off the instrument will automatically switch back to the internal battery
57. lly sweep through the 1 3 Octave Bands in the set duration After the 16kHz 1 3 Octave Band the instrument will measure a dB A dB C and then a dB Z value and then stop storing the measurement in the memory The user can override the automatic sweep by pressing the Up arrow key to step to the next frequency band The display will show until enough data has been accumulated to give an accurate measurement Key Press Display Comments CR 800B User Manual Running LZF 55 4 a mmm 40 Hz e i 143 Oct LZeqt dB Elapsed 00 01 00 Page 25 The instrument has not accumulated sufficient data to give an accurate measurement When enough information has been gathered the LZeq value will be displayed Displaying the data during a measurement Broadband Mode During a Broadband Mode measurement the user can step through the different measurement parameters All of the functions are measured simultaneously and are automatically stored Please note that this function is only available in Broadband Mode Key Press Display Running LAF 59 8 a NEN 7 LAeqt e dB Elapsed 00 08 23 Display Running Display Display Elapsed 00 08 23 Comments The instrument starts with the LAeq t value and the Elapsed Time The Sound Level in this case LAF is shown in the top right hand corner of the screen The Peak C value is shown The Maximum Sound Level
58. nchronise function Broadband Measurement Mode In Broadband Mode the instrument stored the overall values such as Laco Larmax and Ln s as well as storing a noise profile or Time History during each measurement The CR 800B instruments can store up to 1 300 Broadband Measurements which can be of any length up to a maximum of 99 hours per measurement With each measurement is stored a noise profile which consists of 1 second Leq samples with up to a maximum of 11 days of Noise Profile being available Please refer to the Specifications on page 67 for full details of the available memory Frequency Maximum Minimum PUDSHOR Weighting pioplayediae value value Sound Level with Fast Time A Lar LArmax LArmin Weighting C Lcr Lcrmax Lcrmin Z Lzr Lzrmax Lztmin Sound Level with Slow Time A asmax asmin Weighting CS CSmax CSmin Z Lzs Lzsmax Lzsmin Sound Level with Impulse Pu si Time Weighting CI CImax CImin Z Lz Lzimax Lzimin Equivalent Continuous Sound A Laeat Pressure Level with C Lceat S integration time t Z Lzeat A Lae E Sound Exposure Level SEL C Lice Z Lze Peak Sound Pressure C LCpeak Takt Maximum Sound Level DIN 45641 Larteq 5 G i i Impulse Weighted Equivalent A LAIeqt Sounds Press Level with C LCIeqt integration time t Ltegt Z LZIeqt Page 8 CR 800B User Manual Please note that only one F
59. nd Elapsed 00 15 00 enters the measurement review LAeqt 53 5 dB mode LCpeak 95 0 dB LAE 82 9 dB 30 06 03 11 12 07 Review the measurement When the measurement has been stopped the instrument automatically stores the measurement in memory and enters the measurement review mode Use the Up and Down arrow keys to view the different measurement values and press the exit key to return to the main display Refer to page 44 for details of the measurement review mode Page 14 CR 800B User Manual Unpacking and checking the Sound Level Meter Carefully remove the instrument from its shipping container and inspect it for possible damage or missing items If the meter appears to be damaged or something is missing contact Cirrus Research plc or your local representative immediately The basic CR 800B instrument is supplied with the following standard accessories Deaf Defier3 for Windows Software on CD ROM CR 800B User Manual CR 800B Reference Card ZL 800 RS232 Cable Batteries 2 x AA In addition the Type 1 versions of the instrument are supplied with an MV 200C Preamplifier and a microphone box The microphone capsule will be fitted to the MV 200C Preamplifier before shipping If you have ordered the instrument as a complete measurement kit you will have also received some further items such as an Acoustic Calibrator Carrying Case and Windshield Please refer Error Reference source not found for details of fitting
60. nd Level Meter Push the microphone of the Sound Level Meter into the cavity at the end of the calibrator Ensure the microphone is fully inserted into the cavity and is past the O ring seals The microphone should be parallel to the body of the calibrator Also ensure that the small bleed hole next to the microphone cavity is not blocked as this could cause damage to the microphone Most modern Sound Level Meters have electronic calibration with the level adjusted automatically Adjust the Sound Level Meter to the correct level where applicable When correcting the value generated by the calibrator a correction for the type of microphone capsule may need to be applied see Appendix 2 Background Noise In order for the calibrator to operate as intended the ambient acoustic noise level should be no greater than 80dBA Stabilisation In order for the sound pressure level and frequency to stabilise after switching the calibrator on when coupled to a microphone a period of at least 3 seconds should be allowed before performing a calibration CR 800B User Manual Page 75 Changing the Battery The CR 514 amp CR 515 acoustic calibrators use a single 9v alkaline battery This type of battery is known as 6F22 or NEDA 1604 It is also commonly known as PP3 Unscrew the screw holding the battery cover on using a coin 25 The battery type 6F22 PP3 can now be eased out of its holder and replaced The battery should be eased out te
61. nstrument warranty If you experience any problems with the operation of the instrument refer to page 54 for basic troubleshooting If this does not solve the problem contact Cirrus Research plc or your local representative for further assistance Page 54 CR 800B User Manual Section 6 Troubleshooting This section contains information which may solve simple operational problems you may encounter If you are unable to solve the problem or experience any problems with the assembly or operation of the instrument contact Cirrus Research plc or your local representative for further assistance Basics Symptom Possible Cause Possible Remedy The instrument does not switch on The batteries are not fitted Fit new batteries and switch on The batteries are flat or very low Fit new batteries and switch on The batteries are not correctly fitted Remove the batteries and check the polarity of the batteries Calibration Symptom Possible Cause Possible Remedy The calibration fails Too Low The Acoustic Calibrator is not switched on Switch on the Acoustic Calibrator and retry The Acoustic Calibrator is not fitted correctly Check that the Acoustic Calibrator is fitted according to the instructions supplied The Preamplifer is not fitted correctly Type 1 Instruments only For Type 1 Instruments refer to page 14 for details of fitting the preamplifier The microph
62. nt measurement range is HEN 51 Range 40dB to 110dB 70dB to 140dB 60dB to 130dB 50dB to 120dB 40dB to 110d 25 06 03 07 25 56 The measurement range in this example is 40dB to 110dB If the noise level is below 40dB the instrument will indicate Under Range If the noise level is above 110dB the instrument will indicate Overload See page 54 for an explanation of Overload and Under Range Display Comments Page 36 CR 800B User Manual Range LAF The measurement range is 10dB O T A to 80dB and the noise level is 40dB to 110 dB 90 2dB 30dB to 100dB 20dB to 90dB The instrument is overloading and the O L symbol is shown 25 06 03 07 25 56 Range LAF The measurement range is 70dB to 140dB and the noise level is Beer 60dB to 130dB 50dB to 120dB The instrument is under ranging 40dB to 110dB and the U L symbol is shown 25 06 03 07 25 56 The bar graph at the top of the screen can be used to select the appropriate measurement range As the user moves between the different measurement ranges the bar graph changes the top and bottom to match the measurement range The noise level being measured is shown in the bar graph Range 70dB to 140dB 60dB to 130dB 50dB to 120dB 40dB to 110dB 25 06 03 07 25 56 Range 40dB to 110di 30dB to 100dB 20dB to 90dB ETETEN 25 06 03 07 25 56 Range 70dB to 140dB 60dB to 130dB
63. oadband to 1 1 amp 1 3 Octave Band Filters Page 72 CR 800B User Manual MO 800 4 Upgrade from 1 1 to 1 1 amp 1 3 Octave Band Filters MO 800 5 Remote Preamplifier for Type 2 Instruments MO 800 6 20Hz amp 20kHz 1 3 Octave Band Filters Electromagnetic Performance EN 55022 1994 EN 61000 4 2 1995 EN 61000 4 3 1996 EN 61000 4 3 1996 EN 50204 1995 EN 61000 4 8 1994 80MHz 1GHz 25MHz 80MHz 900MHz 50Hz CR 800B User Manual Page 73 Appendix 4 Acoustic Calibrators Operation Switching on the Calibrator Press the Power Button on the end of the Calibrator to switch the unit on The Indicator will illuminate to show that the unit is operating Power Button CR 514 Acoustic Calibrator Cirrus Research plc 94dB 1kHz Z E S P y 9 ag NCLU A zaned N Power Indicator The calibrator will automatically switch off after 5 minutes to preserve battery power To switch off the calibrator manually press the power button again and the indicator will extinguish to show that the unit is switched off Permanent on Mode For some applications there may be a need to have the calibrator switched on continuously To allow for this the calibrator can be turned on by pressing and holding the power button for three seconds Release the button and the indicator will flash to show that the unit is in permanent on mode Press the power button to switch off the calibrator Page 74 CR 800B User Manual Calibrating a Sou
64. olution 00 01 00 Set Clock Set Clock Ti Date 29 06 03 dd mm yy Setup Setup Contrast gt Cal Level 093 7 Resolution Set Clock K Cal Level E g C Freq Weighting Change Ln Values User Metric Setup hting Time Weig Change Ln Values User Metric Setup Change Ln Values Change Ln Value Time Weighting Ln 1 01 0 Freq Weighting lue Change Ln Values Ln 2 10 0 Change Ln Values Change Ln Values Ln 1 Ln 3 Ln 2 50 0 Change Ln Values Change Ln Values Ln 4 90 0 Change Ln Values Change Ln Values Ln 95 0 Setup User Metric Time W ing gt Freq Weighting Change Ln Values User Metric CR 800B Menu Run Durations K Memory Pratt CR 800B User Manual Page 61 Appendix 2 Rating Plate Information The CR 800B meets IEC60651 1979 and IEC60804 1985 These specifications require that this manual provides detailed information to verify that the specifications are met While much of the data required is in the body of this manual the points required to be detailed are listed below in the order in which they occur in the IEC specification The numbers marked after
65. one capsule is loose or not fitted Check that the microphone capsule is tight and fitted correctly Calibration level set to a different level Set the calibration level to the value provided by the Acoustic Calibrator See page 38 The Microphone may be damaged Contact Cirrus Research plc or your local representative for assistance The calibration fails Too High The Acoustic Calibrator is set to a higher level than the expected level Set the Acoustic Calibrator to the correct level The calibration fails Unstable The background noise level is within 15dB of the calibration level Move to a location where the background noise level is more than 15dB below the calibration level The Microphone may be damaged Contact Cirrus Research plc or your local representative for assistance Measurements amp Settings Symptom Possible Cause Possible Remedy No measurements have been Memory is full Check the available memory CR 800B User Manual Page 55 stored See page 48 In 1 1 or 1 3 Octave Band Mode the filters do not automatically sweep The measurement was reset The Run Duration has been set to Manual Restart the measurement Select a Preset Run Duration The measurements are not aligned with the clock The Auto Synchronise function is switched off Switch on the Auto Synchronise function Instrument
66. op of the range selected The reading of this signal will be within the tolerances of IEC60651 up to the point where the overload occurs The following table details the expected linearity for each range and frequency weighting for various pure sine wave frequencies CR 800B Linearity Table for Leg and La measurements Results in brackets are typical values Noise floor typically 7dB below lower value RANGE 1kHz 31Hz 8kHz 1kHz 1kHz 65 141dBA 65 103dBA 65 140dBA 65 141dBC 65 141dBZ 55 131dBA 55 91dBA 55 130dBA 55 131dBC 56 131dBZ 45 121dBA 45 91dBA 45 121dBA 45 121dBC 46 121dBZ 40 110dB 38 110dBA 38 90dBA 38 110dBA 38 110dBC 40 110dBZ ref range 35 111dBA 35 91dBA 35 111dBA 36 111dBC 39 111dBZ Page 62 CR 800B User Manual 26 101dBA 25 81dBA 25 101dBA 28 101dBC 34 101dBC 15 91dBA 15 71dBA 14 91dBA 22 91dBC 34 91dBZ 10 80dB 18 80dBA 18 65dBA 18 80dBA 18 80dBC 36 90dBZ 15 81dBA 15 67dBA 16 81dBA 21 81dBC 35 91dBZ The range of measurement for Peak measurement is 60 to 143 dB C The peak values are valid for 3dB above and 40dB below the top of each range unless an overload occurs IEC804 11 2 4 Linearity and pulse range There are seven ranges available spaced by 10dB steps from the lowest range 10 80dB to the highest 70 140dB With A Frequency Weighting for each range the linearity range exceeds 70
67. ot running Press the right hand arrow key to view the first stored measurement and the left hand arrow kjey to view the last measurement stored Key Press Display Comments Cirrus CR 800B MEN e 97 0 25 06 03 07 25 56 S Ere The first measurement stored is gt em roa an shown Aloway Elapsed 00 15 00 LAeqt 53 5 dB The parameters displayed depend LCpeak 95 0 dB upon the measurement type LAE 82 9 dB 30 06 03 11 12 07 E Mem 10 Broadband The last measurement stored is lt q shown Elapsed 00 15 00 LAeqt 53 5 dB The parameters displayed depend LCpeak 95 0 dB upon the measurement type LAE 82 9 dB 30 06 03 11 12 07 The measurement type is shown at the top of the screen next to the measurement number The different measurement types have different parameters that are displayed and these are described below CR 800B User Manual Page 45 Broadband Measurement Key Press Display Display Display Display Mem 10 Broadband Elapsed 00 15 00 LAeqt 53 5 dB LCpeak 95 0 dB LAE 82 9 dB 30 06 03 11 12 07 Mem 10 Broadband LAFmin 36 5 dB LAFmax 66 9 dB L01 0 60 2 dB 30 06 03 11 12 07 Mem Broadband L10 56 4 dB L50 50 5 dB L95 38 3 dB L99 37 6 dB 30 06 03 11 12 07 Mem 10 Broadband 100 30 30 06 03 11 12 07 1 1 Octave Band Measurements Key Press Display Mem 12 Octave Band 90 2
68. q cea or Lied LaFreq 1 1 Octave Band Mode No measurements are affected by the Frequency Weighting All 1 1 Octave Bands are measured with the Z Frequency Weighting 1 3 Octave Band Mode No measurements are affected by the Frequency Weighting All 1 3 Octave Bands are measured with the Z Frequency Weighting Ln values The five preset Ln or Statistical values that are calculated at the end of a Broadband measurement can be configured to different values The default values are L1 0 Lio o L50 0 Loo 0 and Los5 0 To change the Ln values select Change Ln Values from the Setup Menu Page 42 Key Press Display Setup NEN Time Weighting K Freq Weighting Change Ln Values User Metric v Repv Syncv 00 15 00 Change Ln Values OK 7 Ln 2 Ln 3 Ln 4 wv RepY Syncv 00 15 00 Change Ln Values OK 7 Ln 1 01 0 Repv Syncv 00 15 00 CR 800B User Manual Comments The Ln to be changed can be selected using the Up and Down arrow keys Press OK to select the Ln to change In this example the Ln1 has been selected Use the Up and Down arrow keys to change the value and the Left and Right arrow keys to move between the numbers Press OK to accept the changes or Exit to discard any changes The other Ln values can be altered in the same manner as shown above User Metric The additional measurement parameter provided the CR 800B instrument is known as the User Metric
69. ration of the calibrator is with the unit switched on When the LED indicates the unit is switched on this produces the greatest radio frequency emissions The calibrator continues to function after exposure to contact discharges up to 4kV and air discharges up to 8kV for both positive and negative voltages relative to earth ground The calibrator conforms to IEC 60942 2003 for a modulated root mean square electromagnetic field strength of 10 V m The maximum susceptibility to power and radio frequency fields is with the cavity facing away from the emitter with the battery compartment facing the table the antenna polarisation horizontal and the calibrator switched on Page 78 CR 800B User Manual Free Field Correction When calibrating a microphone which is to be used for free field measurements a small correction may be necessary to compensate for the difference between the microphone s free field response at zero degrees or head on incidence and the pressure level generated by the calibrator The correction is typically 0 3dB for Y inch microphones making the effective calibration level 93 7dB The table below shows the correction values for the standard microphones of Cirrus Research plc Calibration corrections are listed below for the Cirrus Research plc 12 Capsules and three microphone capsules commonly used in Calibration Laboratories Microphone Correction Values Microphone Type Calibration Correction Effective
70. rement Duration to 1 minute Set Measurement Range Start Measurement a Run for 1 minute 7 Stop Measurement 8 Review Measurement Data oe Make a 1 3 Octave Band Measurement over 5 minutes 1 Switch on Calibrate Set Measurement Mode to 1 3 Octave Band Set Measurement Duration to 5 minutes Set Measurement Range Start Measurement a Run for 5 minutes 7 Stop Measurement 8 Review Measurement Data OY Ope Sd Make a set of twenty four 1 hour measurements 1 Switch on Calibrate Set Measurement Mode to Broadband Set Measurement Duration to 1 hour Set Auto Repeat to On Set Number to 25 Set Auto Synchronise to On a Start Measurement After 24 1 hour measurements the instrument will stop Review Measurement Data SA EE o Qo Page 10 CR 800B User Manual Quick Start Switch on Key Press Display D Cirrus CR 800B a JAcrs 07 0 CR 800B v3 00 ER 25 06 03 07 25 56 When the instrument has switched on the start up screen will change to the standard noise level display Calibrate the Sound Level Meter A If a microphone extension cable is to be used during a measurement the instrument must be calibrated with the cable attached Connect the Acoustic Calibrator to the Sound Level Meter and select the 94dB setting on the Acoustic Calibrator Press the Menu key to select the Calibrate option and press OK to start the calibration procedure Key Press Display Comments CR 800B Menu NEN 7 Calibrate
71. requency Weighting can be selected at any time 1 1 amp 1 3 Octave Band Measurement Mode In the 1 1 or 1 3 Octave Band Filter Mode the CR 800B instrument provide a sequential sweep through the filter bands over the measurement duration In addition to the frequency bands the instruments also provide a measurement of the overall Laeq Lceg and Lzeg functions Function Frequency Stored l Weighting Displayedas Measurement Applies to Sound Level with Fast Time 1 1 amp 1 3 Weighting nd his Octave Bands 1 1 amp 1 3 Equivalent Continuous Sound 2 begt TeS Octave Bands Pressure Level with A LAeqt Yes Broadband integration time t C LCeqt Yes Broadband Z LZeqt Yes Broadband The 1 1 Octave Band Filters cover the following frequency bands 31 5Hz to 16kHz The 1 3 Octave Band Filters cover the following frequency bands 25Hz to 16kHz When the MO 800 6 Options is fitted the 1 3 Octave Band Filters include the additional 20Hz and 20kHz 1 3 Octave Band Filters Options amp Accessories The CR 800B Series are also available with a range of options and accessories that can enhance the performance and applications of the instrument For full details please contact Cirrus Research plc or your local representative The most commonly used accessories are listed below CR 511E CR 511F CR 512 CR 590 UA 237 CK 250 CP 65 CT 1 CM 270 1 ZL 202 ZL 205 ZL 210 ZL 225 CK 408 CK 508 CU 195A SW DD3
72. rminal side first by pushing against the spring at the other end Ensure that the battery is inserted with the correct polarity with the negative terminal at the contact with the larger cutout Battery Cover Retaining Screw Battery Battery type The battery should be an alkaline battery not an ordinary dry cell The battery is 9 volts when new and will operate the calibrator down to 6 4 volts When the battery voltage is below 6 6 volts but above 6 4 volts the power LED will flash to indicate that the battery voltage is low When the battery voltage is below 6 4 volts the calibrator will not turn on A discharged battery may allow switch on but will soon drop in voltage and indicate low battery or switch off Page 76 CR 800B User Manual Specification Frequency Sound Level Standardisation Distortion Operating Humidity Operating Static Pressure Operating Temperature Storing Temperature Effective Volume Cavity Diameter Battery Battery Life Battery Voltage Weight with Battery Dimensions 1kHz 1 94dB re 20uPa CR 514 IEC 60942 2003 Class 2 CR 515 IEC 60942 2003 Class 1 Less than 2 25 to 90 Relative Humidity 65 kPa to 108kPa 10 C to 50 C 20 C to 60 C 6 19 cm 0 2 cm 0 525 inch 1 x 9v 6F22 Neda 1604 Approx 15 Hours Continuous Use 9v Nominal 10v Maximum 6 4v Minimum 185g 135mm x 48mm CR 800B User Manual Page 77 Technical Information The normal mode of ope
73. rophone or display 4 In common with almost all acoustic manufacturers Cirrus Research plc do not give a warranty on the microphone or display normally an LCD because of their fragile nature 5 The period of the warranty is 2 two years or 104 weeks from the date of purchase as a new instrument from Cirrus Research plc or their formally approved distributors OR 130 weeks from the date the instrument passed its final manufacturing inspection at Cirrus Research plc whichever is the shorter 6 Any rechargeable battery only has the battery manufacturer s one year warranty 7 No warranty is offered for used equipment unless a special arrangement is made and a written confirmation of the warranty is given by Cirrus Research plc 8 The warranty becomes void if the instrument is not returned for calibration within 18 months or 78 weeks of purchase In the International Standard IEC 61672 this calibration is described as Routine Verification and it is required to ensure that any acoustic instrument measures correctly 9 On completion of the Routine Verification by Cirrus Research plc the instrument will automatically be given an additional free one year warranty 10 There will be a charge for this routine verification and the price is published in the Service Price List 11 It follows that should the instrument be routinely verified by Cirrus Research plc every year the warranty is effectively continuous to a maximum of 12 tw
74. splay Run Duration MEE O OK a User Defined Set User Time K Auto Repeat gt Synchronise K wv Repv Syncv 00 15 00 Auto Repeat Off Set Number OK Repv Syncv 00 15 00 Use the up and down arrows to change the number of measurements required and the left and right arrows to move between the digits Press OK to accept the changes or Exit to discard any changes made Auto Repeat Set Number goo Page 34 CR 800B User Manual Measurement Auto Synchronise This function is new to the CR 800B Series and allows the start of the measurements to be started in time with the clock of the instrument The diagram below shows how the measurement runs from when the Start key is pressed for the duration defined by the Run Duration Start Button Pressed 10 minute measurement 10 minute measurement 10 minute measurement 10 minute measurement EI ae M T TT 12 00 12 05 12 10 12 20 12 30 12 40 This method of starting and stopping the measurements is used for example when the application is Occupational Noise and the user wants to control the starting and stopping of the measurement directly However in many applications such as Environmental Noise measurements it is important to start the measurements at a predetermined time For example when making environmental noise measurements that are for 10 minutes the CR 800B can be set to start the measurements on 10 minute boundaries
75. surement parameters when running a measurement 2 3 4 5 6 7 8 9 10 11 12 13 Move through the stored measurement parameters in memory recall mode Select a higher frequency band in 1 1 and 1 3 Octave Band Filter mode Step up through menu options Change the measurement range and display the current measurement range Enter Memory Recall Mode and step through the memory locations Move through the measurement parameters when running a measurement Move through the stored measurement parameters in memory recall mode Select a lower frequency band in 1 1 and 1 3 Octave Band Filter mode Step down through menu options Resets the current measurement when running Power On and Off Stops the current measurement when running Start and Pause a measurement Switch on and off the display backlight Exit menu option Cancel data entry Select menu option Accept data entry Enter Memory Recall Mode and step through the memory locations Select the menu mode and view the menu options Menu System The CR 800B instruments use a menu system to allow the user to change the operation of the Sound Level Meter This menu system is described below along with the procedure to change the different measurement functions and operational parameters CR 800B User Manual Page 29 Measurement Mode To select the Measurement Mode press the Menu Key The current measurement mode is displayed Please note that the CR 800B Sound Le
76. t 1 Hour Broadband Measurement 1 Hour Broadband Measurement 1 Hour Broadband Measurement 1 Hour Broadband Measurement 1 Hour Broadband Measurement Time History Memory Full M N L Time History NAM Time History NV M Time History NuV Time History NM Time History gt CR 800B User Manual Page 53 Section 5 Maintenance amp Care The CR 800B is a precision measurement instrument and should be treated with care Do not allow the instrument to be exposed to substances which may cause damage to the components of the unit If the instrument is to be used in an environment where particles such as dust may come into contact with the instrument always use a Windshield UA 237 to protect the microphone capsule The CR 800B is not waterproof and should not be used in situations where moisture will form or condense on the microphone capsule or the instrument body If using the CR 800B outdoor use a suitable outdoor measurement kit which has been specifically designed to protect the instrument If the CR 800B becomes dusty wipe it down with a cloth that is lightly dampened with water or a mild detergent Do not use aromatic hydrocarbons chlorinated solvents or methanol based fluids when wiping down the meter Do Not clean the microphone capsule Do Not remove the microphone grill as this can cause severe damage to the membrane Physical damage to the microphone capsule is not covered by the i
77. to IEC number refer to that documents paragraph numbers for reference Additional information The following data assumes the fitting of a MK 224 Type 1 microphone capsule unless otherwise stated For type 2 units an MK 216 is generally fitted Although a Type 2 CR 800B has an identical electronic design and should meet the electrical performance tests to Type 1 this is not guaranteed and it should be assumed that Type 2 tolerances apply as specified in the relevant standards to electrical as well as acoustic performance IEC804 651 11 2 1 The MK 224 Type 1 Electret microphone is used for the CR 811B CR 821B and CR 831B mounted on the plug in pre amplifier MV 200C An extension cable or gooseneck is not required to meet fully the standards claimed The MK 216 Type 2 Electret microphone is used for the CR 812B CR 822B and CR 832B mounted on the integral pre amplifier MV 200C An extension cable or gooseneck is not required to meet fully the standards claimed IEC804 651 11 2 2 The reference direction of incidence is parallel to the sides of the case towards the microphone capsule IEC804 651 11 2 3 The range of measurement for Leq and SPL measurement with a standard assembly is 25 to 140 dBA 37 to 140 dBC 45 to 140 dBZ For signals with a crest factor of up to 10 the top span of the unit can be reduced by up to 17dB This means that a signal with a crest factor of ten will produce an overload at 17dB below the expected t
78. tus of these functions as shown below CR 800B Menu Calibrate Broadband Mode V 1 1 Octave Mode 1 3 Octave Mode To change the measurement duration of the instrument 00215300 Key Press Display CR 800B Menu Calibrate Broadband Mode V Menu 1 1 Octave Mode 1 3 Octave Mode v Repv Syncv 00 15 00 Page 32 CR 800B User Manual Display CR 800B Menu Run Durations K Display Memory K Setup K Print Options Display v Repv Syncv 00 15 00 Display Run Duration OK 1 minute 5 minutes 10 minutes wv Repv Syncv 00 15 00 In this example the measurement duration is set to 15 Minutes and the instrument will run continuously until the Stop key is pressed The change the measurement duration use the Up and Down keys to select the require duration and press OK to select Run Duration 30 minutes 1 hour 8 hours v Repv Syncv 00 15 00 In addition to the preset measurement durations the user can define the measurement duration using the Set User Time Option Display Run Duration User Defined Auto Repeat K Synchronise K Y Repv Syncv 00 15 00 Run Duration OK Time 00 01 00 hh mm ss Repv Syncv 00 15 00 Use the Up and Down keys to change the parameter and the Left and Right keys to move through the different settings Press OK to accept the User Time When the instrument is set to either 1 1 or 1 3 Octave Band Mode the Run
79. vel Meters will revert to Broadband Measurement Mode when the instrument is switched off Key Press Display CR 800B Menu Menu Calibrate Broadband Mode Y 1 1 Octave Mode 1 3 Octave Mode Y RepY Syncv 00 15 00 Broadband Mode To select the Broadband Measurement Mode Key Press Display Display CR 800B Menu Calibrate 1 1 Octave Mode 1 3 Octave Mode OK Y RepY Syncv 00 15 00 l Cirrus CR 800B Exit TOSS E 97 0 25 06 03 07 25 56 Page 30 CR 800B User Manual 1 1 Octave Band Mode To select the 1 1 Octave Band Measurement Mode Key Press Display Display CR 800B Menu Calibrate Broadband Mode OK 1 1 Octave ModeY 1 3 Octave Mode wv RepY Syncv 00 15 00 Cirrus CR 800B a mmm 31 5 Hz 1 1 Oct LZF e dB 02 07 03 14 53 20 Exit 1 3 Octave Band Mode To select the 1 1 Octave Band Measurement Mode Key Press Display Display CR 800B Menu Calibrate Broadband Mode OK 1 1 Octave Mode 1 3 Octave Mode wv Repv Syncv 00 15 00 p Cirrus CR 800B Exit 25 Hz 1 3 Oct LZF e dB 02 07 03 14 53 20 CR 800B User Manual Page 31 Measurement Duration The configuration of the Run Duration the Auto Repeat and the Auto Synchronise functions are all connected and affect each other Always ensure that the status of these three functions is checked before making a measurement When the menu key is pressed the display shows the sta
80. vided with the Deaf Defier3 software for details of the download procedure CR 800B User Manual Page 51 Understanding how the measurements are stored The memory of the CR 800B can store up to 1 300 measurements Each measurement is Known as an Event and can be either Broadband 1 1 Octave Band or 1 3 Octave Band The duration of each measurement does not affect the size that it takes but the different measurements types take up different amounts of space in the instrument memory For example a Broadband measurement take 1 memory slot a 1 1 Octave measurement takes 2 memory slots and a 1 3 Octave measurement takes 3 memory slots The diagram below shows how the different measurements take up different amounts of memory space Memory Memory Memory 4 4 4 Broadband Measurement 1 1 Octave Band Measurement 1 3 Octave Band Measurement 1 1 Octave Band Measurement Broadband Measurement 1 3 Octave Band Measurement Broadband Measurement Broadband Measurement Broadband Measurement 1 1 Octave Band Broadband Measurement Measurement 1 3 Octave Band Broadband Measurement Broadband Measurement Broadband Measurement 1 1 Octave Band Measurement Broadband Measurement Broadband Measurement Broadband Measurement Measurement Broadband Measurement Broadband Measurement The maximum time over which Broadband measurements
81. will diminish if levels near top of scale are constantly monitored or if the batteries are at a low temperature This battery life will also drop if Octave or Third Octave filters are selected IEC651 11 2 22 Not applicable IEC804 651 11 2 23 See microphone data IEC804 651 11 2 24 Consult Cirrus Research plc IEC804 651 11 2 25 Dummy microphone impedance is 18 pF in series with 500hm IEC651 11 2 26 Primary indicator range is 55dB to 95dB on the centre reference range IEC651 11 2 27 Manual only IEC651 11 2 28 Test information detailed later in this manual IEC804 11 2 26 An overload will always occur before non linear distortion takes place IEC804 11 2 27 The instrument can be factory set for random incidence as an option IEC804 11 2 28 The indicator range extends beyond the linearity range Additional filter information The CR 800B meets or exceeds IEC 61260 Types 1 The specification IEC 61260 requires that this manual provides detailed information to verify that the specifications are met While much of the data required is in the body of this manual the points required to be detailed are listed below in the order in which they occur in the IEC specification The numbers marked after the IEC number refer to that documents paragraph numbers for reference IEC1260 7a The octave and third octave filters comply with all performance requirements of IEC61260 1995 Class 1 CR 800B User Manual Page 65 IEC126
82. xposure Level SEL with C frequency weighting Equivalent continuous sound pressure level A measure of the average sound pressure level during a period of time t in dB with C weighting Sound level with C Frequency weighting and Fast Time weighting The maximum Sound level with C Frequency weighting and Fast Time weighting Sound level with C Frequency weighting and Impulse Time weighting The maximum Sound level with C Frequency weighting and Impulse Time weighting Peak Sound pressure level with C frequency weighting Sound level with C Frequency weighting and Slow Time weighting The maximum Sound level with C Frequency weighting and Slow Time weighting Daily personal noise exposure Equivalent continuous sound pressure level A measure of the average sound pressure level during a period of time t in dB Impulse weighted Le as defined by DIN 45641 Statistical analysis of noise levels The n denotes the percentage exceedence Sound Exposure Level SEL with Z frequency weighting Equivalent continuous sound pressure level A measure of the average sound pressure level during a period of time t in dB with Z weighting Sound level with Z Frequency weighting and Fast Time weighting The maximum Sound level with Z Frequency weighting and Fast Time weighting Page 58 L Lzimax Lzs Lzsmax Overload Peak SEL Slow Time Weighting Sound Level Sound Level Meter SPL Statistical Analysis
83. y LcFmin Lcsmin Letminy LzFmin Lzsmin or Lzimin Lo 1 to Lso 9 five simultaneous user selected values available The L s or Statistical parameters are calculated from Sound Level Therefore if the Time Weighting is set to Fast the L s will be calculated from Lar and also for the Slow and Impulse Time Weightings 1 1 Octave Band Mode Filtered Lzs Lzr or LzI not stored 1 3 Octave Band Mode Filtered Lzs Lzr or LzI not stored CR 800B User Manual Page 41 Frequency Weighting The Frequency Weighting of the instrument can be set to either A C or Z To set the Frequency Weighting select the Frequency Weighting option from the menu Key Press Display Comments setup NEN D7 Time Weighting K Change Ln Values User Metric v RepY Syncv 00 15 00 Freq Weighting Select the required Frequency Weighting and press OK to select OK A Weighting C Weighting The select Frequency Weighting is Z Weighting indicated by a tick Press Exit to return to the main Repv Syncv 00 15 00 display The Frequency Weighting applies to the following parameters Broadband Mode Integrated Sound Level Lea Lre OF LZeq Sound Level Lar Las Lar Lcr Les Ler Lze Lzs or Lz not stored Maximum Sound Leve LarFmax Lasmax Latmax Lcrmax Lcsmax Lcimax Lzrmax Lzsmax or Lzimax Minimum Sound Level LaFmin LASmin Latmin L cFmin Lesmin Lcrmin Lzeminy Lzsmin OF Lzimin User Metric Lag Lce Or Lze Lare

CR:800B User Manual - Cirrus Research plc

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