CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

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9.5 AVERAGING Averaging plays a very important role in FFT and RTA analysis. It is vital when analyzing signals buried with noise. It is also important when taking spatially averaged measurements. <strong>CLIOwin</strong> has flexible averaging capabilities. Averaging basically means adding and dividing for the number of additions made. To start an averaged FFT measurement you need to set a number bigger than one in the Target Average drop down; otherwise you have a continuously refreshing single measurement that will continue until the Stop button is pressed. It is possible to choose between linear and exponential averaging. The instrument behaves differently in the two averaging modes. In linear averaging the measurement is continued until the target is reached, then it automatically stops. What you got is exactly what we just explained. In exponential averaging the measurement never stops. When the target is reached the averaging continues relying on a mathematical formula which discards the oldest acquisitions and gives more and more importance to newer ones. The exponential averaging is the default one. As an example Fig. 9.4 compares a single 1kHz sinusoid FFT analysis and 100 averages one. 0.0 CLIO 0.0 CLIO dBV dBV -30.0 -30.0 -60.0 -60.0 -90.0 -90.0 -120.0 -120.0 -150.0 -150.0 0.00 2000 4000 6000 8000 10000 12000 14000 16000 Hz 18000 20000 0.00 2000 4000 6000 8000 10000 12000 14000 16000 Hz 18000 20000 Figure 9.4 This is a classical example of signal buried with noise: the sinusoid's 9th harmonic is clearly visible after 100 averages, but invisible for a single acquisition. Another important feature, when averaging, is the possibility of continuing averaging after a measurement is stopped, has reached its target or a previous measurement has been loaded from disk. <strong>CLIOwin</strong> has this capability when selecting continue in the drop down menu available aside the Go button (Fig.9.5). Figure 9.5 Selecting the continue option allows, as an example, for spatially averaged measurements. Fig. 9.6 shows two 1/3 octave RTA measurements of a small HT satellite at listening position: the black one is a single 10 averages measurement taken on axis; the red one is, instead, built, using the continue option, adding a total of eleven 10 averages measurements taken moving from -25 degrees left to +25 right of the speaker itself. 82 Chapter 9 - FFT
80.0 CLIO dBSPL 70.0 60.0 50.0 40.0 30.0 100 1k Hz 10k 20k Figure 9.6 Chapter 9 - FFT 83
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ELECTRICAL & ACOUSTICAL TESTS User'
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CONTENTS 1 INTRODUCTION ...........
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8.5.1 MEASURING AN INDUCTOR .......
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1 INTRODUCTION 1.1 ABOUT THIS MANUA
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12 Chapter 1 - Introduction
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2.1 THE PB-4281 PC BOARD AND SC-01
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2.2.3 THE MIC-01 (OR MIC-02) FREQUE
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2.4 THE QCBOX MODEL 4 AMPLIFIER & S
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Figure 3.1 2) 2 x Stereo mini jack
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3.3 HARDWARE REGISTRATION WITH WIND
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3.3.2 HARDWARE REGISTRATION UNDER W
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3.3.3 HARDWARE REGISTRATION UNDER W
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Figure 3.21 Let's now verify that t
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3.4 SOFTWARE INSTALLATION This para
Page 32 and 33: 3.6 RUNNING CLIOWIN FOR THE FIRST T
Page 34 and 35: 3.7.1 CALIBRATION VALIDATION Figure
Page 36 and 37: 36 Chapter 3 - Installation
Page 38 and 39: 38 Chapter 4 - Troubleshooting CLIO
Page 40 and 41: 5.3 CLIOWIN DESKTOP The CLIOwin des
Page 42 and 43: It is possible to generate the foll
Page 44 and 45: Fig.5.5 Microphone sensitivity dial
Page 46 and 47: 5.5.2 CONTROLLING A TURNTABLE Fig.5
Page 48 and 49: 5.6.2 ANALYSIS MENU The Analysis me
Page 50 and 51: H Enables the Hold function. Equiva
Page 52 and 53: CTRL+P Swithces on and off the micr
Page 54 and 55: 5.7.2 CONNECTING A MICROPHONE For a
Page 56 and 57: 56 Chapter 5 - CLIOwin basics
Page 58 and 59: When you find a CLIOwin data file i
Page 60 and 61: Enters the Notes dialog where it is
Page 62 and 63: 6.3.5 CALIBRATION File > Calibratio
Page 64 and 65: 6.3.7 STARTUP OPTIONS AND GLOBAL SE
Page 66 and 67: 7.3 BUTTONS AND CHECKBOXES Moves (s
Page 68 and 69: 7.6 THE MLS TIME DOMAIN DISPLAY Whe
Page 70 and 71: 8.2.1 TOOLBAR BUTTONS Starts the me
Page 72 and 73: This operating mode is very useful;
Page 74 and 75: Figure 8.7 With the Multi-meter run
Page 76 and 77: 76 Chapter 8 - Multi-Meter
Page 78 and 79: 9.2.1 TOOLBAR BUTTONS Starts an FFT
Page 80 and 81: 9.4 FFT AND RTA OPERATION The FFT a
Page 84 and 85: 9.6 TIME DATA DISPLAY (OSCILLOSCOPE
Page 86 and 87: 10.2.1 TOOLBAR BUTTONS Starts an ML
Page 88 and 89: 10.2.4 MLS POST-PROCESSING TOOLS Lo
Page 90 and 91: 10.4 MEASURING FREQUENCY RESPONSE I
Page 92 and 93: 150.0 CLIO 180.0 150.0 CLIO 180.0 O
Page 94 and 95: MLS Menu, select dBSPL as Y scale u
Page 96 and 97: 10.4.4 PHASE & GROUP DELAY We used
Page 98 and 99: 110.0 CLIO 7.50 dBSPL ms 100.0 6.00
Page 100 and 101: 10.5 OTHER TIME DOMAIN INFORMATION
Page 102 and 103: utton. Any process you execute can
Page 104 and 105: 104 Chapter 10 - MLS
Page 106 and 107: 11.2.1 TOOLBAR BUTTONS Starts the s
Page 108 and 109: Stepped is also not checked. Typica
Page 110 and 111: 11.3 A BRIEF DESCRIPTION ON SETTING
Page 112 and 113: 11.3.3 GATING Enabling Gating allow
Page 114 and 115: 11.4 DISTORTION AND SETTINGS Sinuso
Page 116 and 117: Finally Fig.11.12 shows the distort
Page 118 and 119: 12.3 WATERFALL BASICS Figure 12.2 W
Page 120 and 121: 12.4 MAKING A CUMULATIVE SPECTRAL D
Page 122 and 123: Let's now change the CSD aspect aga
Page 124 and 125: Figure 12.11 12.5.3 TAKING THE MEAS
Page 126 and 127: Figure 12.17 The final result for o
Page 128 and 129: If you are novice in using CLIO or
Page 130 and 131: -10.0 CLIO dBV -30.0 -50.0 -70.0 -9
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13.4 I SENSE Requires Audiomatica C
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Figure 13.12 Lets proceed now with
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The figure shows us we are going to
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13.7 THIELE & SMALL PARAMETERS 13.7
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L 1kHz L 10kHz Inductance at 10kHz
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Now we can save our complete result
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[19] M.O. Hawksford, “Digital Sig
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CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

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