Noise Measurement Instruments | Cirrus Research plc
Cirrus Research GmbH - Cirrus Research GmbH
Cirrus Research Pionnier dans la création d'instruments de mesure acoustique
User Manual for Cirrus research models including: CR511E, Acoustic Calibrator, Calibrator
Page 6 CR:511E Acoustic Caliibrator User Manual MK:224 microphone capsules which are fitted to the majority of Cirrus Research Sound Level Meters have a correction of -0.3dB when used with the CR:511E.
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DocumentDocumentCR: 511E Acoust ic Caliibrat or User Manual Page 1 User Manual for the CR:511E Acoustic Calibrator This m anual, t he soft ware t o which it relat es, t he program code and drawings are all: © Copyright Cirrus Research plc 1989- 2022 Page 2 CR: 511E Acoust ic Caliibrat or User Manual The cont ent of t his m anual, any illust rat ions, t echnical inform at ion and descript ions wit hin t his docum ent wer e cor r ect at t he t im e of going t o print . Cirrus Research plc reserves t he right t o m ake any changes necessary, wit hout not ice, in line wit h t he policy of cont inuing product developm ent and im provem ent . No part of t his publicat ion m ay be duplicat ed, reprint ed, st ored in a dat a processing syst em or t ransm it t ed by elect ronic, m echanical, phot ographic or ot her m eans, or recorded, t ranslat ed, edit ed, abridged or expanded wit hout t he prior writ t en consent of Cirrus Research plc. No liabilit y is accept ed for any inaccuracies or om issions in t his m anual, alt hough due care has been taken t o ensure t hat is it com plete and accurat e as possible. Accessories supplied by Cirrus Research plc have been designed for use wit h t he inst rum ent at ion m anufact ured by Cirrus Research plc. No responsibilit y is accept ed for dam age caused by t he use of any ot her part s or accessories. I n or der t o t ake account of a policy of cont inual developm ent , Cirrus Research plc reser ves t he r ight t o change any of t he inform at ion cont ained in t his publicat ion wit hout prior not ice. Produced by Cirrus Resear ch plc, Acoust ic House, Bridlingt on Road, Hunm anby, Nor t h Yor kshire, YO14 0PH, Unit ed Kingdom . © Copyright Cirrus Research plc 2022 Reference Num ber 12/ 04/ CR: 511E/ 01 CR: 511E Acoust ic Caliibrat or User Manual Page 3 Overview ...................................................................................................................... 4 Operation ..................................................................................................................... 5 Calibrat ing a Sound Lev el Met er ...................................................................................... 5 Cha nging t he Ba t t e r y .................................................................................................... 7 Battery type .................................................................................................................7 Perform ance I nform ation. ............................................................................................ 8 Variat ion wit h Tem perat ure. ........................................................................................... 8 Barom et ric Pr essure Cor rect ion for CR: 511E. ....................................................................8 Specification. ................................................................................................................ 9 Appe ndix 1 Fr e e Fie ld Cor r e ct ion ............................................................................. 1 0 Microphone Correct ion Values................................................................................................... 10 Exam ple ................................................................................................................................ 10 CE Ce r t if ica t e of Conf or m it y ....................................................................................... 1 1 Equipm ent Descript ion ............................................................................................... 1 1 W arranty I nform ation. ............................................................................................... 12 Cir r us Re se a r ch Office s .............................................................................................. 1 3 Page 4 CR: 511E Acoust ic Caliibrat or User Manual Overview Accurat e calibrat ion of Sound Level Met ers and Sound Measurem ent equipm ent is essential before and after each m easurem ent to ensure the validity of any values recorded. The CR: 511E Acoust ic Calibrat or provides a cost effect ive yet accurat e m eans of achieving this requirem ent. The CR: 511E unit can be used for all m icrophones suit able for t his kind of calibrat ion. I t has t he abilit y t o accept different cavit y adapt ors. The CR: 511E has a nom inal cavit y diam et er of 1.125 inches. A st andard QC: 3 adapt or allows t he unit t o be used wit h a ½ inch m icrophone. Ot her adapt ors are available. The approval by t he Germ an t est office PTB is valid for t he 1/ 2 inch adapt or. The CR: 511E provides t wo reference levels of 94dB( 1 Pa) and 104 dB ( 3.16 Pa) . I t is therefore possible to j udge the linearit y of t he instrum ent and to calibrate at high background noises. The frequency is 1000 Hz, t herefore t he frequency weight ing of t he inst rum ent has no influence on the accuracy of the calibrat ion. The CR: 511E Acoust ic Calibrat or m eet s t he requirem ent s of I EC 942, it corresponds t o t ype 1L, which m eans, it is t ype 1 if t he correct ion values for t he air pressure are observed. CR: 511E Acoust ic Caliibrat or User Manual Page 5 Operation The CR: 511E acoust ic calibrat or has provision for t he calibr at ion of a var iet y of m icrophones of various diam et ers. The nom inal cavit y has a diam et er of 1.125 inches. A st andard QC: 3 adapt or allows t he unit t o be used wit h a ½ inch m icrophone. Ot her adaptors are available for 1 inch, 1/ 4 inches, 20 m m and 10 m m . The CR: 511E unit is supplied w it h one adapt or as st andard. Typically t his is t he QC: 3 adapt or for ½ " m icrophones. The sound pressure generat ed by t he calibrat ors are 94dB and 104dB. However, when calibrating a m icrophone which is to be used for free field m easurem ents, a sm all correction m ay be necessary to com pensate for the difference between the m icrophone's free field response at 'zero degrees' or 'head-on' incidence and t he pressure level generat ed by t he calibrat or. The correct ion is t ypically - 0.3dB for ½ inch m icrophones ( m aking the effect ive calibrat ion level 93.7dB) . A second correct ion is required if t he barom et ric pressure is not 1013 hPa. A t able shows t he correct ion values for t he st andard m icrophones of Cir rus Research plc I n order t o adapt different m icrophones t o t he CR: 511E at t he accuracy st at ed t he adapt ors available from Cirrus Research plc should be used. For half inch m icrophones t he t ype Q3 is available, wit h t his adapt or t he calibrat or can be cert ified officially. Calibrating a Sound Level Meter Ensure t hat t he bat t eries in bot h t he calibr at or and t he Sound Level Met er are in good condit ion. Do not at t em pt t o calibrat e t he Sound Level Met er if bat t ery levels are low. Push t he m icrophone of t he Sound Level Met er, wit h t he appropr iat e adapt or if required, int o t he cavit y at t he end of t he calibrat or. Ensure t he m icrophone is fully insert ed int o t he cavit y and is past t he `O' ring seal. The m icrophone should be parallel to the body of the calibrator. Turn on t he calibrat or and select t he reference level required. I n m ost sit uat ions, t his will be 94dB, alt hough t he CR: 511E unit s provide an addit ional 104dB reference level. Check which level t he Sound Level Met er is set t o accept during calibrat ion. Most m odern Sound Level Met ers have elect ronic calibrat ion w it h t he level adj ust ed autom atically. Adj ust t he Sound Level Met er t o t he correct level where applicable. There are several fact ors t o be considered when correct ing t he value generat ed t he calibrat or. These are: 1. A correction for the type of m icrophone capsule. 2. A correct ion for any changes in barom et ric pressure from 1013m Bar ( 1013 hPa) . I n m ost sit uat ions, t he Sound Level Met er will be fit t ed w it h a fr ee field m icrophone. The correct ion required for t he specific m icr ophone fit t ed t o t he Sound Level Met er will be given in the operation m anual for that instrum ent. However, the MK: 215 and Page 6 CR: 511E Acoust ic Caliibrat or User Manual MK: 224 m icrophone capsules which are fit t ed t o t he m aj orit y of Cirrus Research Sound Level Met ers have a correct ion of - 0.3dB w hen used wit h t he CR: 511E. The CR: 511E Acoust ic Calibrat or is designed t o be used m ainly w it h ½ " Microphone Capsules. Calibrat ion correct ions are list ed below for t he Cir rus Research plc ½ " Capsules and t wo m icrophone capsules com m only used in t est labs: Microphone Type Calibrat ion Correct ion Effect ive Calibrat ion Level MK: 202 MK: 215 MK: 216 MK: 226 MK: 224 -0.3dB -0.3dB -0.3dB -0.3dB -0.3dB 93.7 dB 93.7 dB 93.7 dB 93.7 dB 93.7 dB B&K 4134 0dB B&K 4180 0dB 94.0 dB 94.0 dB Ex am ple An exam ple of t he procedure used t o calculat e t he value required is shown below: Level = 94.0dB + Microphone Correct ion + Barom et ric/ Alt it ude Correct ion Level = 94.0dB + ( - 0.3dB) + Correct ion for 700m Bar Level = 94.0dB + ( - 0.3dB) + ( - 0.8dB) Level = 92.9dB Different m icrophones will have different correction values. Also, the use of different calibrat or adapt ors m ay alt er t he final values required. Please check t he operat ion m anual for t he Sound Level Met er or m icrophone concerned for det ails. CR: 511E Acoust ic Caliibrat or User Manual Page 7 Changing the Battery The CR: 511E acoust ic calibrat or uses a single 9v bat t ery. This t ype of bat t ery is known as 6F22 or NEDA 1604. I t is also com m only known as PP3. 1. Put a sm all rod, usually a screwdr iver, t hrough t he t wo holes in t he end cap and gently pull the cap from the body. 2. Pull out t he end plat e which has t he sw it ch and bat t ery holder at t ached. 3. The bat t ery, t ype 6F22 ( PP3) can now be eased out of it s holder and replaced. Make SURE you check t he correct polar it y of t he bat t ery, which clips int o t he press studs on the battery holder. Battery type One bat t ery t ype 6F22 is used. This is called NEDA 1604 in t he USA and part s of Asia. I t is oft en called 'PP3' in t he UK and t he old Com m onwealt h. The bat t ery should preferably be an alkaline bat t ery, not an ordinary dry cell. Whilst an ordinary cell is adequate for operation, the low price of long life batteries m akes their use sensible. A long life battery is not only m ore efficient, but is less prone to leak and dam age the calibrat or. The m at erial of t he end ring and cavit y is easily eat en away by bat t ery leakage. The bat t ery is 9 volt s when new and will operat e t he calibrat or down t o about 6 volts. Page 8 CR: 511E Acoust ic Caliibrat or User Manual Performance Information. Variation with Temperature. The acoust ic out put s of t he CR: 511E Acoust ic Calibrat or w ill alt er wit h changes in t em perat ure. The t olerances shown below are for reference condit ions of 1013m Bar ( 1013 hPa) and 65% Relat ive Hum idit y. Class Class 1L Tem perat ure Range + 5oC to + 35oC To ler an ces ± 0.3dB Barometric Pressure Correction for CR:511E. The variat ion due t o st at ic pressure m ay be up t o 0.7 dB from t he nom inal value and t herefore, t he st at ic pressure m ust be known in order t o m ake t his correct ion. This figure can be obtained e.g. from your local airport. However, if m easurem ents are required to the highest accuracy, a barom eter should be purchased. The CR: 590 Barom et er is available for use w it h t he CR: 511E Acoust ic Calibrat or. CR:511E Barometric Pressure Correction 0.4 0.3 0.2 0.1 0 -0.1 dB -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 650 700 750 800 850 900 950 1000 1050 1100 mB CR: 511E Acoust ic Caliibrat or User Manual Page 9 Specification. Fr eq u en cy Sound Level Level Accuracy Standardisat ion Distort ion Variat ion wit h Tem perat ure Variat ion w it h Barom et ric Pressure Operat ing hum idit y Operat ing Tem perat ure Storing tem perature Long Term Drift Effect ive Volum e Cavit y Diam et er Bat t er y Weight with battery Dim ensions 1kHz ± 1.5% 94dB & 104dB re 20µPa ± 0.3dB at 23 C and 101.3kPa I EC 942 Class 1L Less t han 2% To I EC 942 Class 1L See Curves or CR: 590 barom et er 10 to 90% rel.hum. - 10oC to + 50oC - 20oC to + 60oC Better than ± 0.1dB 40 cm 3 1.125 inch wit h Q3 Adapt or for ½ " Microphones 1 x 9v 6F22 ( Neda 1604) 220g 135mm x 48mm Page 10 CR: 511E Acoust ic Caliibrat or User Manual Appendix 1 Free Field Correction When calibrat ing a m icrophone which is to be used for free field m easurem ents, a sm all correction m ay be necessary to com pensate for the difference between the m icrophone's free field response at 'zero degrees' or 'head- on' incidence and t he pressure level generated by the calibrator. The correct ion is t ypically - 0.3dB for ½ inch m icrophones ( m aking t he effect ive calibrat ion level 93.7dB) . The t able below shows t he correct ion values for t he st andard m icrophones of Cirrus Research plc. Calibrat ion correct ions are list ed below for t he Cirrus Research plc ½ " Capsules and t hree m icrophone capsules com m only used in Calibrat ion Laborat ories: Microphone Correction Values Microphone Type M K:2 0 2 M K:2 1 5 M K:2 1 6 M K:2 2 6 M K:2 2 4 B&K 4134 B&K 4180 B&K 4192 Calibration CorrectionEffective Calibration Level -0.3dB -0.3dB -0.3dB -0.3dB -0.3dB 0dB 0dB 0dB 93.7 dB 93.7 dB 93.7 dB 93.7 dB 93.7 dB 94.0 dB 94.0 dB 94.0 dB Example An exam ple of t he procedure used t o calculat e t he value for an MK: 224 m icrophone is shown below : Level = 94.0dB + Microphone Correct ion Level = 94.0dB + ( - 0.3dB) Level = 93.7dB Different m icrophones will have different correct ion values. Please check t he operat ion m anual for t he Sound Level Met er or m icrophone concerned for det ails. CR: 511E Acoust ic Caliibrat or User Manual CE Certificate of Conformity Cirrus Research plc Hunmanby UK CE Certificate of Conformity Page 11 Man u f act u r er : Cirrus Research plc Acoust ic House, Bridlingt on Road Hunm anby, Nort h Yorkshire, YO14 0PH Unit ed Kingdom Telephone + 44 1723 891655 Equipment Description The following equipm ent m anufact ured aft er 1st January 2007: CR: 511E Acoust ic Calibrat or Along with t heir standard accessories According t o EMC Dir ect ives 89/ 336/ EEC and 93/ 98/ EEC m eet the following st andards EN 61000-6-3 (2001) EMC : Generic em ission st andard for resident ial, com m ercial and light indust r ial environm ents. EN 61000-6-1 (2001) EMC : Generic im m unit y st andard for resident ial, com m ercial and light indust r ial environm ents. Signed Dat ed 1st April 2022 Martin Williams Chief Engineer Page 12 CR: 511E Acoust ic Caliibrat or User Manual Warranty Information. 1. Every new product is provided with a 12-month no-quibble warranty. This covers everything we provide against failure, poor workmanship and accidental damage. NB - European Union law states a product has to be fit for purpose for 24 months after purchase. This two-year period covers failure and poor workmanship only. 2. If the product is calibrated by Cirrus Research or an authorised calibration and service centre, then the initial 12-month warranty is extended by a further 12 months, with the same conditions, for up to 15 years in total. 3. If a product has not been calibrated annually by Cirrus Research or an authorised calibration and service centre, then you may buy back into the warranty scheme for a small fee, plus the cost of calibration. This can only be done once during the life of the product. 4. If a microphone capsule fails under warranty and is physically damaged, we will replace it with a refurbished capsule. 5. If you don't wish to have a refurbished capsule, then you can trade in your damaged capsule for a new one, which will incur a fee. CR: 511E Acoust ic Caliibrat or User Manual Page 13 Cirrus Research Offices The addresses given below are t he Cirrus Research plc offices. Cirrus Research plc also hav e approv ed dist ribut ors and agent s is m any count ries worldwide. For det ails of y our local represent at ive, please cont act Cirrus Research plc at t he address below . Cont act det ails for Cirrus Research aut horised dist ribut ors and agent s ar e also av ailable fr om t he I nt ernet Web sit e at the address shown below. United Kingdom Cirrus Research plc Acoust ic House Bridlingt on Road Hunm anby Nort h York shire Unit ed Kingdom YO14 0PH Tel: Email: Website: +44 (0) 1723 891655 sales@cirrusresearch.com www.cirrusresearch.com Germany Cirrus Research GmbH Arabella Center Lyoner Straße 44 - 48 60528 Fankfurt am Main Deutschland Tel: Email: Website: +49 (0) 69 95932047 vertrieb@cirrusresearch.com www.cirrusresearch.de France Cirrus Research France S.A.S. 679 avenue de la République 59800 Lille France Tel: Email: Website: +33 (0) 633 976 626 infos@cirrusresearch.fr www.cirrusresearch.fr