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Summary of Contents for Larson Davis CAL291
- Page 1 Larson Davis CAL291 Technical Reference Manual I291.01 REV B...
- Page 2 Copyright Copyright 2006, 2007, 2008 and 2010 by PCB Piezotronics, Inc. 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 PCB Piezotronics, Inc. Disclaimer The following paragraph does not apply in any state or country where such statements are not agreeable with local law:...
- Page 3 I291.01 REV B...
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Page 4: Table Of Contents
End Plate ............2-3 Connectors ............. 2-3 Input ................... 2-3 Power ..................2-3 Chapter 3 Operation ......... 3-1 Powering the CAL291........3-1 Input Signal............ 3-1 Microphone Placement........3-2 Pressure\Residual Intensity Measurement..3-3 Amplitude/Phase Normalization ....3-4 Appendix A Technical Specifications .... A-1 Standards ............ -
Page 5: Chapter 1 Introduction
C H A P T E R 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: •... -
Page 6: Features
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. -
Page 7: Unpacking And Inspection
Unpacking and Inspection Your CAL291 has been shipped in protective packaging. Pleaser verify the package contains the items listed below and retain the shipping container for safe shipment at a future date. Report any damages or shortage immediately to Larson Davis, Inc. at 801-375-0177. - Page 8 CAL291 Refernce Manual Accessories...
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Page 9: Chapter 2 Description
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 CAL 291 as shown in Figure 2-1. -
Page 10: Microphone Ports
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 CAL291 Refernce Manual Microphone Ports... -
Page 11: End Plate
Figure 2-3. Fuse 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 Refernce Manual... - Page 12 CAL291 Refernce Manual End Plate...
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Page 13: Chapter 3 Operation
DC output to the power connector on the end plate of the CAL291. Press the upper portion of the power switch (I) to switch on the CAL291 and press the lower portion (O) to switch it off. -
Page 14: Microphone Placement
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 microphone preamplifiers. • If using a sound intensity probe, separate the two... -
Page 15: Pressure\Residual Intensity Measurement
With the probe microphones inserted into the microphone ports as described in “Microphone Placement” on page 3-1, excite the CAL291 with pink noise at a low voltage level using the signal generator. Table 3-1 shows the recommended maximum input voltage... -
Page 16: Amplitude/Phase Normalization
Some instruments, such as the Larson Davis Models 2900B, 3000+ and 3200 can not only measure the complex transfer function between channels in the 1/3 octave frequency... - Page 17 CAL291 Refernce Manual Amplitude/Phase Normalization...
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Page 18: Appendix A Technical Specifications
SPL difference between channels: < 0.1 dB 1 kHz • Maximum pressure-intensity index: > 27 dB • Output Level and Maximum Input Voltage for < 1% dis- tortion: as specified in Table A-1 on page A-2 CAL291 Reference Manual Technical Specifications... -
Page 19: Mechanical Characteristics
10.0 cm (4.0 in) Height 5.3 cm (1.1 in) Weight 1.0 kg (2.2 lb) Power D.C. Power: 9 -16 Vdc, 400 mA provided by PSA004 DC Power Supply (included) 90 - 240 VAC @ 50- 60 Hz Mechanical Characteristics CAL291 Reference Manual... - Page 20 CAL291 Reference Manual Power...
- Page 21 ......................... 1-3 Description ........................2-1 End Plate........................2-3 General........................2-1 Operation ........................3-1 Amplitude/Phase Normalization ................3-4 Input Signal....................... 3-1 Microphone Placement ................... 3-2 Poweriing the CAL291 .................... 3-1 PressureResidual Intensity Measurement............3-3 Technical Specifications ..................A-1 I291.01 REV B...
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