CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

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This operating mode is very useful; as an example suppose you want to measure the total harmonic distortion of a sinusoidal signal while displaying also its frequency content. To do this lets invoke the FFT and Multi-meter control panels together; then press the Go button in FFT, this will start both measurements (see also 8.6 about this); inside the Multi-meter select the THD parameter and then press the minimized button. You should obtain a measurement situation like the one in Fig.8.3. In this figure we were acquiring directly the output of CLIO while generating a 1kHz sinusoid at 0dBu. Figure 8.3 8.3.3 CAPTURING THE GLOBAL REFERENCE LEVEL Let's see now how to capture a level to be the reference for other measurements. Once this is done then the subsequent measures done in all the instrument, with the units dBRel selected, will refer to it. As an example we go back to the procedure described in 3.5.1 which aims at validating a calibration. This is substantially the measurement of the frequency response of the CLIO board itself which is, when calibrated, a straight line; as said in the cited procedure the acquired level of such a measurement is -5.2 dBV. Let's see a practical way to acquire this level in order to refer future measurements to it. Maintain the instrument connected as in Fig.3.9, with input A and output A short circuited. Press the MLS button to start generating the MLS signal (the same that MLS uses during its operation). Press Go to start acquiring this signal, you should read circa 0.54V. Select also the Slow integration as the MLS signal is a wide band noise. While the measurement is running press the button; answering yes to the warning message you'll set the global reference level. To inspect the captured value press the button's drop down menu. You should see the situation in Fig.8.4. Figure 8.4 The drop down tells you what is the actual global reference level. If you want to restore the default , which is 1V, just choose Reset. Should you choose now, as reading units, dBRel expect to read 0dBRel! 72 Chapter 8 - Multi-Meter
But let's go to the MLS control panel and see how we can reference frequency response measurements. Open the MLS control panel and simply choose dBRel as units. Then execute the measurement. You should obtain the situation of Fig. 8.5; as general tendency is always a straight line but the reading, now, is circa 0dBRel. 8.4 THE SOUND LEVEL METER Figure 8.5 Selecting Pressure as measured parameter gives your Multi-meter the functionality of a Sound Level Meter. Three units are available: dBSPL, dBA and dBC. dBSPL is a direct reading of the sound level, relative to the reference pressure of 20uPa. Remember that CLIOwin needs to know your microphone sensitivity to correctly execute this measurement (see 5.4.4). dBA and dBC are frequency weighted measurements and are usually requested to assess, for example, environmental noise or any human related annoyance. In these two cases the program postprocess the measurement, applying the appropriate frequency filter as described in IEC-651 norms. 8.4.1 CAPTURING THE MICROPHONE SENSITIVITY When measuring pressure, it is possible to calibrate your measuring chain if you have available a pressure reference like an acoustic calibrator. It is possible to calibrate both channels. In this situation, in fact, the button, if pressed, will prompt the instrument to capture a pressure reading as reference for the reading channel; it also expects that the reference pressure level at its input is 94dB, as furnished by the vast majority of acoustic calibrators. As result of this procedure the program will calculate the sensitivity, in mV/Pa, of the microphonic front end, and store it in the CLIOwin settings. Figure 8.6 If you press the button's drop down you see reported the actual Microphone sensitivity. In this case, differently from the case of Voltage measurements, the default quantity is 18 mV/Pa, which is a rough average or Audiomatica's microphones MIC-01 and MIC- 02 sensitivity. Let's see how to capture the channel A microphone sensitivity. In Figure 8.7 you see a Bruel&Kjaer 4231 acoustic calibrator fitted to a MIC-02 microphone. Chapter 8 - Multi-Meter 73
Page 1 and 2:
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
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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
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
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 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 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
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Let's now change the CSD aspect aga
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Figure 12.11 12.5.3 TAKING THE MEAS
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Figure 12.17 The final result for o
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If you are novice in using CLIO or
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-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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