CAL291
Contents
1. 1 1 2 1 3 1 Output Level and Maximum Input Voltage 3 3 Technical Specifications esse A 1 Output Level and Maximum Input Voltage sese A 2 Warranty Customer Satisfaction B 7 CAL291 Reference Manual List of Tables 1v 1 1 2 List of Tables CAL291 Reference Manual Introduction The Larson Davis Model CAL291 Residual Intensity Calibrator satisfies the residual intensity test device specifications of both IEC 1043 1993 and ANSI S1 9 1996 About This Manual This manual has 3 chapters and 1 appendix covering the following topics CAL291 Reference Manual Chapter 1 Introduction Orients the user to the contents of this user manual and the features functions and measurement capabilities of the CAL291 It also includes instructions on unpacking the CAL291 Chapter 2 Description Provides physical description of the CAL291 Chapter 3 Operation Describes the setup and operation of the CAL291 Appendix Specifications Presents the technical specifications of the CAL291 Introduction 1 1 Features The Larson Davis Model CAL291 Residual Intensity Calibrator has the following features Applies the same signal with zero phase difference to pair of 1 2 or 1 4 microphon2. and fuse are located on the end plate as shown in FIGURE 2 3 Power Switch Input Connector Power Connector FIGURE 2 3 CAL291 End Plate Connectors Input BNC Female Power 2 5 X 5 5 mm coaxial connector center positive CAL291 Reference Manual General Description 2 3 General Description CAL291 Reference Manual Operation This chapter presents a detailed description of the operation of the CAL291 Powering the CAL291 An LED in the center of the top CAL291 is powered by the Larson Davis PSA004 surface of the CAL291 is illuminated which is supplied as a standard accessory Connect the AC when the CAL291 power is On power cable to mains power and the DC output to the power connector on the end plate of the CAL291 Press the upper portion of the power switch I position to switch on the CAL291 and press the lower portion to switch it off Input Signal The CAL291 was designed to work Connect the output from an external signal generator optimally with the analog capable of generating pink noise to the BNC input on the digitial signal generators available end plate of the CAL291 with the Larson Davis Models 2800 2900 3000 and 3200 portable real time Analyzers CAL291 Reference Manual Operation 3 1 Microphone Placement In most cases this CAL291 will be used with a dual channel sound intensity probe although it can also be used with two separate microphones mounted micro
3. at 801 375 0177 If you have not already done so please record your instrument s serial number located on the bottom of the instrument and the purchase date You may be asked to give this information in future communications with Larson Davis The CAL291 is delivered with the following standard accessories e PSA004 100 240 Vac to 12Vdc 2 5A Switching AC Power Adaptor Two ADP038 1 2 to 1 4 microphone adaptors User Manual Larson Davis part number 1291 01 Calibration Certificate Unpacking and Inspection 1 3 Accessories CAL291 Reference Manual Description The physical description of the CAL291 is presented in this chapter Operational information is presented in Chapter 3 Operation on page 3 1 General Description The CAL291 has a flat shape factor for optimal use on a table or desktop In use the sound intensity probe of the intensity measurement system to be evaluated is laid flat on the table with the two microphones inserted into the microphone ports of the CAL291 as shown in FIGURE 2 1 FIGURE 2 1 CAL291 General View CAL291 Reference Manual Description 2 1 Microphone Ports The microphone ports are on two opposite faces of an aluminum block mounted on one end of the CAL291 as shown in FIGURE 2 2 FIGURE 2 2 Aluminum Block with Microphone Ports 2 2 General Description CAL291 Reference Manual End Plate The power switch electrical input connnector DC power connector
4. 5 dB 115 dB 1 kHz Adjust the signal generator output to obtain a sound pressure level at the microphones within this range and the amplitude level difference between the two microphones will be 0 1 dB 1kHz The phase angle between the acoustic signals will be zero Frequency HZ Output SPL dB re 20 uPa Maximum Input Voltage dBuV Table 3 1 Output Level and Maximum Input Voltage The signals applied to the microphones will now be as required for the measurement of the pressure residual intensity index ANSI 1 9 1997 and IEC 1043 1993 call for the measurement of the pressure residual intensity index in 1 3 octave bands 1 1 octave bands for instruments providing only 1 1 octave analysis The user 15 directed to refer to the appropriate standards for further details on performing these measurements as specified CAL291 Reference Manual Pressure Residual Intensity Measurement 3 3 Amplitude Phase Normalization For sound intensity measurements it 1s essential to have the best possible amplitude and phase match between measurement channels in order to meet the minimum pressure residual intensity index values stipulated by the standards Both the ANSI and IEC standards include provisions for phase compensation in the measurement system Because a residual intensity testing device is being used as the acoustic source for both microphones we know that they are exposed to equal amplitude signals with zer
5. CAL291 Residual Intensity Calibrator Reference Manual Larson Davis Inc 1681 West 820 North Provo UT 84601 1341 Phone 801 375 0177 FAX 801 375 0182 www larsondavis com 1291 01 Rev Copyright Copyright 2005 by Larson Davis Incorporated This manual is copyrighted with all rights reserved The manual may not be copied in whole or in part for any use without prior written consent of Larson Davis Inc Disclaimer The following paragraph does not apply in any state or country where such statements are not agreeable with local law Even though Larson Davis Inc has reviewed its documentation Larson Davis Incorporated makes no warranty or representation either expressed or implied with respect to this product and documentation its quality performance merchantability or fitness for a particular purpose This documentation is subject to change without notice and should not be construed as a commitment or representation by Larson Davis Inc This publication may contain inaccuracies or typographical errors Larson Davis Inc will periodically update the material for inclusion in new editions Changes and improvements to the information described in this manual may be made at any time Equal Opportunity Employer Larson Davis is an equal opportunity employer and does not discriminate on the basis of race color religion gender national origin disability or veteran status Customer Service In the U S ca
6. J C Shipping Charges The buyer will return the product freight prepaid by the Buyer to an authorized service center The product will be returned to the buyer freight prepaid by LD D Products Manufactured by Others This Limited Warranty does not cover any products manufactured by others Such products are subject to the warranty if any of their respective manufacturers and to be repaired only by a respective authorized service person for such products LD shall have no obligation to undertake repairs of products manufactured by others CAL291 Reference Manual Warranty Customer Satisfaction B 7 NO SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES LD S SOLE OBLIGATIONS UNDER THIS LIMITED WARRANTY ARE SET FORTH ABOVE IN PARAGRAPHS B AND D IN NO EVENT SHALL LD ITS CONTRACTORS OR SUPPLIERS BE LIABLE TO THE BUYER FOR ANY LOST PROFITS DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT IN TORT OR ANY OTHER LEGAL THEORY SUCH DAMAGES FOR WHICH LD SHALL NOT BE RESPONSIBLE INCLUDE BUT ARE NOT LIMITED TO LOST TIME AND CONVENIENCE LOSS OF USE OF THE PRODUCT THE COST OF A PRODUCT RENTAL COSTS OF GASOLINE TELEPHONE TRAVEL OR LODGING THE LOSS OF PERSONAL OR COMMERCIAL PROPERTY AND THE LOSS OF REVENUE Some states do not permit the limitation or disclaimer of incidental or consequential damages Therefore the above disclaimer of incidental or consequential damages may not apply to certain p
7. SCFrIPHON ORARE deuda 2 1 General E RAR i 2 1 DIMENSIONS A 2 F Features of CAL291 serere idet neret 1 2 2 3 Input Signalisation 3 1 Inspection 1 3 Introduction 1 1 L Larson Davis 2900 22222 2 3 4 Larson Davis 3000 55 dE 3 4 Larson Davis 3200 2222 3 4 M Maximum Output Sound Pressure A 1 Index CAL291 Reference Manual Mechanical Characteristics ss A 2 Microphone 3 1 Microphone Ports antenne 2 2 Normalization Amplitude PhaSe sm nm te RR 3 4 O Output AcotllstiCal adt nat ete ne Mens ed aeris 1 Amplitude Difference eie imei m ere e e dE 1 Maximum Input Voltage ss 1 Sound Pressure Level ss 1 POWOFP 3 1 2 Power aoi tesi oam 2 3 Pressure Residual Intensity Measurement 3 2 S Standards A 1 T Technical 0 1 0 Unpacking nnn adden dii ar 1 3 W Warranty ns At B 7 lip eR 2 CAL291 Reference Manual Index
8. eference Manual 2 DAMAGE CAUSED ACTS OF GOD THAT INCLUDE BUT ARE NOT LIMITED TO HAILSTORMS WINDSTORMS HURRICANES TORNADOES SANDSTORMS LIGHTNING FLOODS AND EARTHQUAKES 3 DAMAGE UNDER CONDITIONS CAUSED BY FIRE OR ACCIDENT BY ABUSE OR BY NEGLIGENCE OF THE USER OR ANY OTHER PERSON OTHER THAN LD BY IMPROPER INSTALLATION BY MISUSE BY INCORRECT OPERATION BY NORMAL WEAR AND TEAR BY IMPROPER ADJUSTMENT OR ALTERATION BY ALTERATIONS NOT COMPLETED BY AUTHORIZED SERVICE PERSONNEL OR BY FAILURE OF PRODUCTS PARTS FROM SUCH ALTERATIONS 4 COSTS OF REPAIRING DAMAGE CAUSED BY POOR OR IMPROPER MAINTENANCE OR UNAUTHORIZED REPAIR S COSTS OF MODIFYING THE PRODUCT IN ANY WAY ONCE DELIVERED TO THE BUYER EVEN IF SUCH MODIFICATIONS WERE ADDED AS A PRODUCTION CHANGE ON OTHER PRODUCTS MADE AFTER THE BUYER S PRODUCT WAS BUILT Authority to Alter This Limited Warranty No agent representative distributor or authorized dealer of LD has any authority to alter the terms of this Limited Warranty in any way This Limited Warranty may be altered only in a writing signed by an authorized officer of LD CAL291 Reference Manual Warranty Customer Satisfaction B 9 Warranty Customer Satisfaction CAL291 Reference Manual PD OUT rette eter 1 1 ACCessOries 1 3 Amplitude Phase Normalization 2 2222221 1 3 4 ADPIICATIONS rS 1 2 C Connectors DC PoWer sise ne 2 3 ee CEA 2 3 D DE
9. ent senesne dete AG a i UE 3 1 Pressure Residual Intensity Measurement 3 2 Amplitude Phase Normalization 3 4 Technical Specifications A 1 Standards 1 Input 45m ese e nn 1 nieder 1 Acoustical Outputs 1 Mechanical Characteristics ie eet tiger ert RS A 2 ted ee SORTE URS ta i I edt ln ed EO dettes A 2 eere te eH te ee e eed 2 rime 2 Weight zem Eo det eg A 2 A 2 Warranty Customer Satisfaction B 7 CAL291 Reference Manual Table of Contents ii 1 1 2 Table of Contents CAL291 Reference Manual List of Figures Introduction ecc 1 1 2 1 CAT291 General View eee teet teinte 2 1 Aluminum Block with Microphone Ports 2 2 CARO T End Plate es usc ed RINT NRI 2 3 m 3 1 Microphones In Place Inside Microphone Ports of 1291 3 2 Technical Specifications es A 1 Warranty Customer Satisfaction B 7 CAL29T Reference Manual List of Figures 11 1 1 2 List of Figures CAL291 Reference Manual List of Tables INTFOGUCHON
10. es Can be driven by external signal generators such as the following Larson Davis Model SRC20 Signal Source Analog or digital signal generator modules available for the Larson Davis Models 2800 2900 3000 and 3200 portable real time analyzers Built in amplifier provides sound pressure levels to 122 dB Applications Generation of signals for verification of the amplitude phase accuracy of multi channel acoustic measurement systems Amplitude Phase Normalization The digital filters of the Larson Davis analyzers provide both amplitude and phase permitting the measurement of the complex transfer function between two measurement channels including microphones in 1 3 octave frequency bands By using the CAL291 to excite both microphones simultaneously the amplitude and phase differences between the two measurement channels can be determined as a function of frequency From this information a correction function can be generated within the analyzer to correct for any amplitude and phase errors which may have existed between channels prior to the normalization procedure 1 2 Features CAL291 Reference Manual Unpacking and Inspection Accessories CAL291 Reference Manual Your CAL291 has been shipped in protective packaging Please verify the package contains the items listed below and retain the shipping container for safe shipment at a future date Report any damage or shortage immediately to Larson Davis Inc
11. f defects in material and workmanship for a period of two 2 years from date of original purchase In furtherance of LD s commitment to Total Customer Satisfaction LD will for a period of one 1 year from date of original purchase refund 100 of the customer s purchase price for any product with which the buyer is not completely satisfied subject to the exceptions contained in Paragraph J of this Limited Warranty The option of a refund may be selected during this one 1 year period in lieu of repair replacement or exchange of the product Extended Labor Warranty In furtherance of LD s commitment to Total Customer Satisfaction LD offers an extended labor warranty of one 1 year on all products calibrated or certified by a factory technician at any time or from time to time during the first seven years of the product life from date of manufacture The customer s sole remedy pursuant to this extended warranty is to receive free labor for any repairs required during the period in which the extended warranty is effective This extended labor warranty is subject to the limitations as outlined in Paragraph J Service amp Repair Limited Warranty In addition to the limited warranties set forth above LD offers a 90 day parts and labor limited warranty for all repair work performed at the factory This warranty is limited to parts repaired or replaced at the factory by LD This warranty 1s also subject to the limitations as outlined in Paragraph
12. ll toll free 888 258 3222 International customers call 801 375 0175 FAX 802 375 0182 Worldwide Web www LarsonDavis com Record of Serial Number and Purchase Date Please examine your instrument and record the following information below You may be asked to give this information in any future communications you have with Larson Davis Inc CAL291 4 Date of Purchase Recycling Larson Davis Inc is an environmentally friendly organization and encourages our customers to be environmentally conscious When this product reaches its end of life please recycle the product through a local recycling center or return the product to Larson Davis Inc Attn Recycling Coordinator 1681 West 820 North Provo Utah USA 84601 where it will be accepted for disposal i iv Chapter 1 Chapter 2 Chapter 3 Appendix A Appendix B Table of Contents Introduction 1 1 About This 2 e eee 1 1 Inu 1 1 Applications e ctu o oC i RU OH HE REESE 1 2 Unpacking and Inspection ss 1 3 Accessories and Optional Equipment 1 3 Description 2 1 General Description iR 2 1 Microphone 2 2 End Plate Pian hei an ie BR eee 2 3 Connectors 2 3 putere eneen a a a a aE S 2 3 POWER E 2 3 Operation 3 1 Powering the CAT291 e Wen 3 1 Tuput Signal env pvo E 3 1 Microphone Placem
13. n channels lt 0 1 dB 1 kHz Maximum pressure intensity index gt 27 dB Output Level and Maximum Input Voltage for lt 1 distortion as specified in Table A 1 on page A 2 CAL291 Reference Manual Technical Specifications 1 Frequency Output SPL dB re 20 uPa Maximum Input Voltage dBuV Table A 1 Output Level and Maximum Input Voltage Mechanical Characteristics Length 25 6 cm 10 3 in Width 10 0 cm 4 0 in Height 5 3 cm 1 11 Weight 1 0 kg 2 2 Ib Power D C Power 9 16 Vdc 400 mA provided by PSA004 DC Power Supply included 90 240 Vac 50 60 Hz A 2 Technical Specifications CAL291 Reference Manual APPENDIX Warranty Customer Satisfaction Total Customer Satisfaction Larson Davis Inc LD guarantees Total Customer Satisfaction If at any time you are not completely satisfied with any LD product LD will repair replace or exchange it at no charge except as otherwise provided in this Limited Warranty The employees of LD strive to provide superior unmatched customer service Should you find yourself dissatisfied with any LD product for any reason consult a LD Application engineer or local representative distributor to discuss your situation B Purchase Price Refund Limited Warranty LD warrants to the original purchaser the Buyer that unless otherwise expressly specified in writing by a LD officer all LD products shall be free o
14. o phase difference between them within the limits of the device Thus any variation of the magnitude of the transfer function between channels from unity 0 dB and of the phase from zero is the result of errors in the measurement system which includes the microphones intensity probe electronics and the analyzer Some instruments such as the Larson Davis Models 2900B 3000 and 3200 can not only measure the complex transfer function between channels in 1 3 octave frequency bands but they can also use the measured transfer function to generate a correction function to correct for some of the errors and decrease the pressure residual intensity index of the system For further details on the implementation of this normalization technique see the operators manual for the instrument being used Amplitude Phase Normalization CAL291 Reference Manual APPENDIX Technical Specifications The technical specifications in this chapter are subject to change without notice Please refer to calibration and test results for data on a specific unit Standards Meets the residual intensity test device specifications as presented IEC 1043 1993 Instruments for the measurement of sound intensity and ANSI S1 9 1996 Instruments for measurement of sound intensity Input Input Connector BNC with impedance 1 MQ Acoustical Output Sound Pressure Level 1 harmonic distortion 25 115 dB 1 kHz SPL difference betwee
15. phone preamplifiers A Ifusing a sound intensity probe separate the two microphones as described in the operating manual for the probe remove the spacer and spread the microphones far enough apart that they can be placed over the microphone port block Do not remove the microphone grid caps Slide them firmly into the two ports as shown in FIGURE 3 1 FIGURE 3 1 SENA In Place Inside Microphone Ports of CAL291 B If using separate microphones insert each firmly into the microphone ports It may be necessary to place a support beneath the preamplifiers so that they are aligned parallel to the center line of the microphone port openings 3 2 Microphone Placement CAL291 Reference Manual Pressure Residual Intensity Measurement The CAL291 can be used to determine the pressure residual intensity index of either the sound intensity probe or the complete sound intensity measurement system With the probe microphones inserted into the microphone ports as described in Microphone Placement on page 3 2 excite the CAL291 with pink noise at a low voltage level using the signal generator Table 3 1 shows the recommended maximum input voltage level to the CAL291 for several different frequency bands and the corresponding sound pressure levels which would be produced at the microphone diaphragms To maintain the total harmonic distortion less than 195 the sound pressure level at the microphones should be kept within the range 2
16. urchasers NO LIABILITY IN EXCESS OF PURCHASE PRICE IN NO EVENT SHALL LD S OBLIGATIONS UNDER THIS LIMITED WARRANTY EXCEED THE PURCHASE PRICE OF THE PRODUCT PLUS ANY SHIPPING CHARGES THAT LD MAY BE OBLIGATED TO PAY PURSUANT TO PARAGRAPH C ABOVE G NO EXTENSION OF STATUTE OF LIMITATIONS ANY REPAIRS PERFORMED UNDER THIS LIMITED WARRANTY SHALL NOT IN ANY WAY EXTEND THE STATUTES OF LIMITATIONS FOR CLAIMS UNDER THIS LIMITED WARRANTY H WAIVER OF OTHER WARRANTIES THE EXPRESS WARRANTIES SET FORTH IN THIS LIMITED WARRANTY ARE IN LIEU OF AND EXCLUDE ANY AND ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Some states do not permit the disclaimer of implied warranties Therefore the above disclaimer of implied warranties may not apply to certain purchasers I Procedure for Warranty Performance If the product fails to perform to LD s specifications the Buyer must provide LD with the applicable model and serial numbers the date of purchase and the nature of the problem J ADDITIONAL EXCLUSIONS FROM THIS LIMITED WARRANTY NOTWITHSTANDING ANYTHING TO THE CONTRARY CONTAINED IN THIS LIMITED WARRANTY THIS LIMITED WARRANTY DOES NOT COVER ANY OF THE FOLLOWING 1 EQUIPMENT THAT HAS BEEN ABUSED DAMAGED USED BEYOND RATED CAPACITY OR REPAIRED BY PERSONS OTHER THAN AUTHORIZED SERVICE PERSONNEL B 8 Warranty Customer Satisfaction CAL291 R
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