Larson Davis CAL291 Manuel du produit
I291.01 REV B
Larson Davis
CAL291
Technical Reference Manual
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:
Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics, Inc. makes no
warranty or representation, either expressed or implied, with respect to this instrument 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 PCB Piezotronics, Inc.
This publication may contain inaccuracies or typographical errors. PCB Piezotronics, 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.
Recycling
PCB Piezotronics, 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:
PCB Piezotronics, Inc.
Attn: Recycling Coordinator
1681 West 820 North
Provo, Utah, USA 84601-1341
where it will be accepted for disposal
Product Warranty
Refer to our website, www.larsondavis.com, for a copy of our product warranty.
I291.01 REV B
CAL291 Technical Reference Manual Table of Contents i-i
Table of Contents
Chapter 1 Introduction 1-1
About This Manual......................................... 1-1
Features ........................................................ 1-2
Applications ................................................... 1-2
Unpacking and Inspection ............................. 1-3
Accessories ................................................... 1-3
Chapter 2 Description ...................................... 2-1
General Description....................................... 2-1
Microphone Ports .......................................... 2-2
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 ...................................................... A-1
Input............................................................... A-1
Acoustical Output .......................................... A-1
Mechanical Characteristics............................ A-2
Power ............................................................ A-2
CAL291 Refernce Manual About This Manual 1-1
CHAPTER
1Introduction
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:
•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 a physical description
of the CAL291.
•Chapter 3 - Operation: Describes the setup and
operation of the CAL291.
•Appendix A- Specifications: presents the technical
specifications of the CAL291.
1-2 Features CAL291 Refernce Manual
Features
The Larson Davis Model CAL291 Residual Intensity
Calibrator has the following features:
• Applies the same signal with zero phase difference to a
pair of 1/2” or 1/4” microphones
• 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 the 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.
CAL291 Refernce Manual Unpacking and Inspection 1-3
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.
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.
Accessories
The CAL291 is delivered with the following standard
accessories:
• PSA004 100 - 240 VAC to 12 Vdc 2.5A Switching AC
Power Adaptor
• Two ADP038 1/2” to 1/4” microphone adaptors
• User Manual (Larson Davis part number I291.01)
• Calibration Certificate
1-4 Accessories CAL291 Refernce Manual
CAL291 Refernce Manual General Description 2-1
CHAPTER
2Description
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 CAL 291 as shown in Figure 2-1.
FIGURE 2-1 CAL291, General View
2-2 Microphone Ports CAL291 Refernce Manual
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
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