CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

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11.3.3 GATING Enabling Gating allows quasi anechoic Frequency Response to be carried out in normal environments, with obvious and less obvious limitation. Regarding the geometrical environment required, Sinusoidal analysis does not differ from what has been said about MLS. Nevertheless the latter give a much more intuitive approach. It is strongly suggested to become very familiar with quasi anechoic measurements using MLS before dealing with gating. What follows is a brief description of the parameters involved. We are going to use some figures to help our intuitive grasp. Fig.11.4, repeated from the MLS chapter, show a typical setup, while Fig.11.5 shows what really happens, using as stimuli a 20ms 1kHz Sinusoidal Burst. SPEAKER DIRECT SOUND 70 cm - 2.03mS MIC FIRST REFLECTION 250 CM - 7.26mS 120 cm ABSORBING MATERIAL FLOOR Figure 11.4 0.020 CLIO V 0.012 0.004 -0.004 -0.012 -0.020 0.00 2.0 4.0 6.0 8.0 10.0 12 14 16 ms 18 20 Figure 11.5 The time of sound fly is clearly visible at the beginning, roughly 1.3ms. This is the value users should input in the Delay Edit Box. Thereafter is a short time the device takes to start. This is usually short enough to not affect amplitude evaluation but adversely affect distortion measurements. At 7 and 8 ms, where there are two consequent sinusoid positive peak, a level increase is clearly visible. This is the effect of the first reflection (floor); it affects amplitude evaluation which therefore should have stopped before. The time the system evaluate the signal is usually defined as Meter On time. This is 112 Chapter 11 - Sinusoidal
automatically set by CLIO around the value of 6 ms, as long as the Frequency involved is high enough to allow this. In Fig.11.6 Excel plots the Meter On Time Vs Frequency CLIO uses. Figure 11.6 Users should use this graphic to determine the lowest Frequency that has been measured in anechoic state. Using a fixed predefined Microphone and Loudspeaker location makes all these parameters easier to define in routine measurement processes. But for new situation its very advisable to run an MLS and have a look at the impulse response obtained. Fig.11.7 shows the labels of the corresponding data to be input as gating parameters. Figure 11.7 Chapter 11 - Sinusoidal 113
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ELECTRICAL & ACOUSTICAL TESTS User'
Page 3 and 4:
CONTENTS 1 INTRODUCTION ...........
Page 5 and 6:
8.5.1 MEASURING AN INDUCTOR .......
Page 9:
1 INTRODUCTION 1.1 ABOUT THIS MANUA
Page 12 and 13:
12 Chapter 1 - Introduction
Page 14 and 15:
2.1 THE PB-4281 PC BOARD AND SC-01
Page 16 and 17:
2.2.3 THE MIC-01 (OR MIC-02) FREQUE
Page 18 and 19:
2.4 THE QCBOX MODEL 4 AMPLIFIER & S
Page 20 and 21:
Figure 3.1 2) 2 x Stereo mini jack
Page 22 and 23:
3.3 HARDWARE REGISTRATION WITH WIND
Page 24 and 25:
3.3.2 HARDWARE REGISTRATION UNDER W
Page 26 and 27:
3.3.3 HARDWARE REGISTRATION UNDER W
Page 28 and 29:
Figure 3.21 Let's now verify that t
Page 30 and 31:
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
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H Enables the Hold function. Equiva
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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 82 and 83: 9.5 AVERAGING Averaging plays a ver
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 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
Page 132 and 133: 13.4 I SENSE Requires Audiomatica C
Page 134 and 135: Figure 13.12 Lets proceed now with
Page 136 and 137: The figure shows us we are going to
Page 138 and 139: 13.7 THIELE & SMALL PARAMETERS 13.7
Page 140 and 141: L 1kHz L 10kHz Inductance at 10kHz
Page 142 and 143: Now we can save our complete result
Page 144: [19] M.O. Hawksford, “Digital Sig
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