Portable Impedance Meter System Type 9737
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Portable Impedance Meter System Type 9737 represents state-of-the-art normal incidence impedance measurements for the aerospace industry. Increasingly stringent aerospace environmental regulations are demanding improvements in liner attenuation, which is driving ever improved impedances in installed acoustic liners. As a result, fully bonded panels must now be assessed for their true effective acoustic behaviour in their final condition. These measurements are superseding the traditional geometric and DC flow methods. Type 9737 is a lightweight, compact, robust and user-friendly system, suitable for both research and production quality control impedance measurements up to 150 dB SPL. It allows immediate extraction of key acoustic parameters, such as impedance spectra vs overall SPL, and acoustic resistance vs acoustic velocity. Uses and Features Uses • Research and quality control impedance measurements • Measurement of the acoustic properties of engine nacelle liners and aircraft interiors • Measurement of: - Acoustic absorption coefficient - Acoustic reflection coefficient - Normalised impedance and admittance - Acoustic resistance as a function of acoustic velocity - Acoustic velocity as a function of frequency • Measurements on complex or composite materials • Measurements on orientation-sensitive materials Measurement Features • Turnkey system for ease of operation during calibration, measurement and data export • Measure at overall SPLs (OASPLs) up to 150 dB • Measurement parameters and routines include: - Option to loop on increasing overall SPL or pure tone SPL - Acoustic pressure and acoustic velocity spectra at sample surface • Measurements viewable in real time for ease of monitoring • Measurement with broadband, pure-tone, or user-defined source • Calculation of non-linear resistance variation with acoustic velocity • In-tube sample holder for flanged tube correction routine • Automated pass/fail impedance quality control routine, for use by non-acoustic specialists (includes automated Microsoft® Word report with pass/fail result, and interactive impedance plot) • Automated acoustic centre routine for microphone distance calibration with varying flanges System Features Based on two-microphone transfer function test method, allowing fast data measurement • Employs LAN-XI data acquisition and PULSE™ LabShop analysis system, providing high speed and accuracy • Lightweight and compact • Sound source activation switch and status indicator integrated in handle • Integrated sensors measure temperature, pressure and relative humidity • Two handles for ease of use • 29 mm inner diameter tube sized for optimum performance between 500 Hz and 6400 Hz • Carrying case (one case for complete system) • Can be combined with optional wider tubes for measurements down to 50 Hz, that is, Impedance Tube Kit Type 4206 (50 Hz - 6.4 kHz) or Type 4206-A (100 Hz - 3.2 kHz) • Flat flange designed for optimized sealing: flange removable for replacement with custom-built curved flanges, for maximised sealing to contoured panels • Pass/fail status light on tube handle and on laptop display for automated QC tests

Versatile and Modern Impedance Meter System Type 9737 Fig. 1 The Impedance Meter System (PC not included) Impedance Tube PC LAN-XI Front End and Power Amplifier Sample Holder Portable Impedance Meter System Type 9737 is a lightweight, compact, robust and user-friendly system suitable for both research and production quality control impedance measurements at up to 150 dB SPL. Fig. 2 Type 9737 being used on an acoustic panel sample The system allows immediate extraction of key acoustic parameters, which are then directly exportable to Microsoft Excel® and/or Word. The system components are...

As a result, all the benefits of the PULSE LabShop platform are available, including advanced features for calibration, measurement, display and reporting, the PULSE LabShop task-oriented user-interface, and extreme accuracy. The meter program also contains all the functionality of the standard material testing software, PULSE Acoustic Material Testing in a Tube Type 7758, which is a complete and fully integrated system for making acoustic measurements on small material samples in the 50 Hz to 6.4 kHz frequency range, when using the optional Impedance Tube Kit (50 Hz – 6.4 kHz) Type 4206 or...

Impedance Meter Program for LAN-XI WT-9888 Impedance Meter Program for LAN-XI WT-9888 features an effective, task-oriented user interface that transforms even the most complex test situations into straightforward, intuitive processes, see Fig. 6. Within the program, each test session is defined as a ‘project’ that contains all relevant settings and a set of tasks corresponding to the actual stages of the test. Tasks are listed in the display as icons that open predefined screen layouts with task-dedicated control windows and displays. Fig. 6 The Impedance Meter Program’s taskoriented user...

Test Configuration Interface The test configuration interface allows you to enter test specific metadata, such as the operator and item under test, together with the tolerance limits (dB) for QC checking, see Fig. 8. Handle and on-screen indicators show you the pass/fail result in real time, while data can be exported directly into a Word-based QC report, with interactive impedance curves for acoustic evaluation. Bn*i & Kjwf - PULSE labShop fast Track Version 18 n 9 • 2014-01-16 • Boemg first new Tube pis OASPUoop Reactance The measurement results page shows the impedance variation with...

Fig. 11 Export measurement results to Excel® The Portable Impedance Meter allows you to not only make fast acoustic measurements, in situ, at high SPLs, but it also offers immediate export of the data to Microsoft Excel® or Word, see Fig. 11. The PULSE Impedance Meter Program is delivered with predefined projects for handling typical material testing situations. These provide a convenient starting point for creating user-defined projects.