ELECTRICAL & ACOUSTICAL TESTS CLIO Software Release 1.
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CONTENTS INSIDE THE CLIO POCKET BOX..........................................5 TECHNICAL SPECIFICATIONS............................................6 CP-01 AUDIO INTERFACE............................................................................6 MIC-02 MICROPHONE.................................................................................6 CLIO POCKET SOFTWARE REL.1.1 UNDER X-RAYS.............7 LOG CHIRP ANALYSIS.................................................................................
INSIDE THE CLIO POCKET BOX You should receive your CLIO Pocket housed in a plastic box like this: Inside the box you find: – – – – – – The CP-01 Audio Interface The CLIO Pocket CD with software and drivers The Microphone MIC-02 One USB 2.0 cable One RCA to RCA 2.
TECHNICAL SPECIFICATIONS CP-01 AUDIO INTERFACE GENERATOR 24 Bit sigma-delta D/A Converter Frequency range: 1Hz-45kHz Frequency accuracy: better than 0.01% Frequency resolution: 0.01Hz Output impedance: 150Ω Max output level (Sine): 13dBu (3.46Vrms) Attenuation: 0.1 dB steps to full mute THD+Noise(Sine): .008% AC ANALYZER 24 bit sigma-delta A/D Converter Input range (full scale): +40dBV down to -40dBV Max input acceptance: +40dBV (283Vpp) Input impedance: 64kΩ (5.6kΩ mic) Phantom power supply: 8.
CLIO POCKET SOFTWARE REL.1.1 UNDER X-RAYS LOG CHIRP ANALYSIS - Amplitude, frequency and time calibrated response. Chirp length: 16384, 65536 points Impulse length range: 1.
SIGNAL GENERATOR AND OUTPUT CONTROLS - Dedicated Generator Panel with on-the-fly controls Plays standard wav files Highly optimized waveform calculator Waveform: Sinusoid, FFT-bin optimized, bursted and tapered Waveform: Two Sinusoids with relative amplitudes Waveform: CEA burst with cycles control, FFT-bin optimized and tapered Waveform: White noise Waveform: Chirp, Lin or Log, up to 256k size and start and stop frequencies Waveform: Pink noise, FFT matched, pseudorandom, low crest factor Waveform: All To
SYSTEM - Software operates native under Windows or OSX Touch and gesture compliant software design Hardware relies on dedicated USB driver Ultra stable, glitch-free, streaming operation Self-calibration with comparison to Audiomatica Labs calibration conditions Stored calibration parameters trace international standards Assistance warning in case of any component run out of spec with time Security warning in case of any unauthorized parameter change CLIO POCKET SOFTWARE REL.1.
1 CLIO POCKET INSTALLATION 1.1 MINIMUM PC CONFIGURATION The CLIO CP-01 audio interface running the CLIO Pocket software can be installed in any personal computer with the following minimum system requirements: – Pentium IV class processor (suggested minimum 2GHz) – One free USB 2.0 port – 1024x786 video adapter – Microsoft Windows XP, Vista, 7, 8, 8.1, Apple Mac OSX PLEASE FOLLOW THESE PROCEDURES TO INSTALL AND GET STARTED WITH YOUR CLIO POCKET! 1.
Right-Click on each ClioPkt device under Other Devices and choose Update Driver Software. At the successive prompt: Browse your computer and point to the folder inside the installation CD where the proper drivers are located (usually \Windows\Driver\Vista_7_8).
Your driver installation was successful! 1.3 DRIVER INSTALLATION UNDER WINDOWS XP Installing under XP differs as, when you plug in CLIO Pocket, the Found New Hardware Wizard starts The wizard will direct you while installing the two drivers needed. You should Install from a specific location and point to the driver folder for XP on the CD (usually \Windows\Driver\XP) and then answer Continue Anyway to the prompt about Windows Logo testing.
At the end please refer to above 2.2 and inspect Device Manager to verify proper installation of the drivers.
1.4 SOFTWARE INSTALLATION UNDER WINDOWS This paragraph deals with software installation. Be sure to have administrative rights when installing CLIO Pocket. Launch the CLIO Pocket installer running the ClioPktSetup.exe file from the installation CD: At the end of the wizard the CLIO Pocket software should be installed smoothly; take note of the installation folder (usually C:\Program Files\Audiomatica\ClioPkt).
1.5 INSTALLING UNDER OSX Connect your CLIO Pocket to a free USB 2.0 port on your Mac. Note: the front panel blue LED should NOT be lit at this time. You may find the OSX installer (ClioPkt.pkg) in the CLIO Pocket CD under the /OSX folder. Double click on the ClioPkt package icon to open the installer: The installer window should open: Click on Continue to proceed with the installation.
Under OSX the installation is performed in three steps: 1 Device driver installation (device driver files are copied under /usr/local/lib/ folder) 2 ClioPkt application installation (application bundle is copied under Applications folder) 3 Ancillary files and folder structure installation (files and folders are copied under /Library/ClioPkt/ folder) Click on Install to proceed with the Standard Installation elsewhere click on Customize to select which items you want to install.
Click on Standard Install to go back to the Standard Installation, or select the items you want to install and click on the Install button. In order to install the Device Drivers the system root password should be typed: At this point the installer copies the folders and files to the local installation media.
The installation is successful, depending on your OSX version you should find the ClioPkt application under user /Applications/ folder and Launchpad.
1.6 HOW TO UNINSTALL CLIO POCKET UNDER OSX At the end of the installation you should have the following items added to your system: 1 Device drivers library: $ ls /usr/local/lib | grep libftd libftd2xx.1.2.2.dylib libftd2xx.dylib 2 ClioPkt application bundle: $ ls /Applications/ | grep ClioPkt ClioPkt.
2 CLIO POCKET MAP 2.1 RUNNING CLIO POCKET FOR THE FIRST TIME If you have completed the preceding installation procedures, you are ready to run CLIO Pocket! From the Start Menu choose Programs, then CLIO Pocket and click on the CLIO icon. Upon a successful installation the front panel blue led should now light up, you may hear the internal relays clicking and the program should start smoothly and present the main desktop.
2.2 CLIO POCKET DESKTOP Particular attention should be paid to the corners of the main window of CLIO Pocket; there useful and important, sometime vital, information is displayed. The lower left corner keeps information on the hardware status.
Here we briefly describe the buttons and other mouse controllable areas of CLIO Pocket Desktop. Feel free to click on each of these and experiment yourself. Upper bar, graph buttons and controls. Lower bar and graph controls. Side bar.
2.3 HOT KEYS ESC Immediately kills the generator. Equivalent to releasing F1 Invokes CLIO Pocket manual. Equivalent to F2 Saves a measurement file relative to the active measurement. Equivalent to F3 Loads a measurement file relative to the active measurement. Equivalent to F5 Recalls measurement Options. Equivalent to F6 Enables/disables autoscale. Equivalent to F7 Decreases the output level by 1dB. Equivalent to SHIFT+F7 Decreases the output level by 0.1dB.
2.4 THE GRAPH DISPLAY The figure explains the main objects found in a Frequency response measurement display. Inside the graph you find the main curve which reflects an executed (or loaded from disk) measurement; up to nine overlays curves which are stored by the user and can be controlled interactively, the two markers which are activated by clicking on the respective buttons.
It is possible to directly input the Y scale values; to activate the input boxes simply click on the scale extremes. HOW TO ZOOM 1) Click on the Zoom+ button. 2) Position the mouse and PRESS the left mouse button at the beginning of your selection and keep the mouse button pressed. Don't just click otherwise you get a warning message! 3) With the mouse button pressed move the mouse until the second selection point. 4) Now release the left mouse button.
THE CHIRP TIME DOMAIN DISPLAY Figure 6.2 In this case there is only one overlay. It is also possible to select a portion of the main curve by means of three particular buttons. The selected portion of the main curve is identified by a start and stop point and is drawn in a different color from the unselected portion. Defines the start point of the selection. Before clicking with the button activate Marker A and position cursor to the desired point. Defines the stop point of the selection.
2.5 INITIAL TEST MEASUREMENT Let's now execute our first test measurement: to play and capture a 1kHz sinusoid. The In-Out Loop button should be down, click on it if not; in this way CLIO connects output with input with an internal relay. This connection is very important as it lets you capture and analyze a signal generated by CLIO without the need for an external connecting cable. Then click on the generator icon to play a 1kHz sinusoid, it's the default signal.
The result you should obtain is an FFT analysis of the 1kHz sinusoid and its time representation given by its waveform. 2.6 MICROPHONE SENSITIVITY As seen, the main and default measurement unit of the instrument is AC voltage. Before taking measurements in different units, such as dBSPL, you must input the proper transducer sensitivity.
microphone: In the case of figure input 13.4 mV/Pa in the Pressure>Sensitivity edit box.
3 CALIBRATION 3.1 SYSTEM CALIBRATION This section describes how to perform the system calibration. Proceed only if previous test succeeded! Be sure that, any time you perform a calibration, the system has warmed up for, at least 15-20 minutes. If done too soon you may receive the Calibration Failed warning message; in case repeat the procedure after a while. Select Calibration from the Main menu Leave the CLIO Pocket front plugs unconnected when calibrating.
STEP 2: Then click on the LogChirp button to invoke the LogChirp panel and press the Frequency Graph button. Press the Go button to execute a LogChirp Frequency response measurement; after about 1 second you should obtain the desired result, a straight line as in the following Figure.
You can click on the marker button and inspect the amplitude of the measured signal: you should obtain a reading around 0dBV, this is the correct output level of the LogChirp signal with the generator output set to 1V. Now click on the Measurement Settings dialog as in Figure. button to invoke the Log Chirp Settings Click on the Phase checkbox and press OK. The measured phase response should be displayed.
The correct readings should be around zero degrees. 3.3 TROUBLESHOOTING CLIO INSTALLATION To receive assistance please contact Audiomatica at support@audiomatica.com or connect to our website www.audiomatica.com.
4 ENJOY CLIO POCKET 4.1 IMPEDANCE MEASUREMENTS AND T&S PARAMETERS Once the Calibration has been verified it's time to start performing some measurements. Loudspeaker Impedance can be measured with CLIO Pocket out of the box. Connect the RCA to Alligator Impedance Cable to the CLIO output and to the Loudspeaker terminals (as in the Picture). Verify that the loop button is still down. Select the LogChirp Analysis.
Actually this is not an Impedance Curve, but a Frequency Response showing the log scaled voltage division of CLIO’s output impedance with the loudspeaker’s input impedance. Open the LogChirp Settings and change both Size to 65536 and Units to Ohm. With the latter settings, perform the measure again.
Obviously yours should be different with a similar shape. You will have to adjust the Y scale either manually or with the AutoScale Button. Why we changed Units to Ohm should be obvious. Increasing the Size of the Measurement and relative FFT brings enhanced low Frequency resolution. This is advisable measuring woofers and midranges. The default output level of 1.000V is fine in most cases, but can be increased with high impedance devices.
Click on the Units label within the Level Meter and select the correct measurement units for the component under test (Resistance, Capacitance, or Inductance). Then press the arrow that starts all measurements and you should see a real time measurement. We end this chapter by covering T&S Parameters, because these are calculated by post-processing impedance measurements.
While the whole procedure can be carried with Impedance present in memory but not saved, we strongly suggest that you carry out the two measurements and save them with meaningful names. It is a good idea to include the amount of Mass (or Volume) used in the name of the second file while “FreeAir” is a good choice for the first. With the Free Air measurement in memory open the CLIO Pocket Option Dialog and choose T&S Parameters Tab. Check that Free Air Radio Button is selected and fill the required data.
To get the complete set of Parameters load the Added Mass Impedance file and, again recall the CLIO Pocket Options, T&S Tab By selecting the Added mass Radio Button the Added Mass value input will appear. Input the weight of the used mass and confirm with the OK Button. By clicking the T&S Parameters Button again, the complete set of T&S Parameters should appear.
4.2 CONNECTING THE MICROPHONE If, up to testing T&S Parameters, everything has worked as described, is now time to connect the microphone. Leave the loudspeaker connected as for impedance. Using the RCA to RCA 2.7m long microphone cable connect the MIC02 to the CLIO Input. Check you have set the correct Sensitivity as written in 2.3. Put the microphone in the Speaker Nearfield as shown in the picture above. Turn the Mic Power Supply on. Release the In-Out Loop button.
perform the measurement . Repeat measuring and adjusting Input Gain until the maximum before overload. In the figure above we have it set at -40dBV (10mV) full scale which is the highest possible Input Gain. Depending on the speaker this might change. You can also safely increase or reduce the Output level to keep the response within 80 to 90 dBSPL. You should obtain a Pressure Frequency Response even if, for several reasons, it is not the real one of the speaker.
4.3 ANECHOIC FREQUENCY RESPONSE OF A LOUDSPEAKER SYSTEM Up to now what was in the CLIO box was sufficient. To proceed now you have to connect your own audio power amplifier via an an RCA cable. The amplifier should possess a flat Frequency Response and a low output impedance. Check that the CLIO generator is turned OFF and that the amplifier is turned OFF. Connect CLIO's Output to the amplifier input and the amplifier's output to the speaker you are measuring.
compensates for the fact that the supplied MIC02 inverting the signal as do most measuring microphones. However, it is possible to correct this issue in a more elegant way using the Input Polarity button . In our example we will measure a relatively small two way loudspeaker. For a physical small speaker it is advisable to put the microphone at 50-70cm from the speaker, thus obtaining a longer reflection-free measurement than when testing at 1m. The greater the distance between both the speaker and the mic.
If there is a volume control on the amplifier it should have been already set counter-clockwise (to minimum). Therefore leave the CLIO Output level at its default 1.000V. In absence of a volume control on the amplifier set CLIO Output level at 0.01V or below. Open the Generator Control Panel and generate Pink Noise by clicking on Pink and then on Play. You can ignore the Size for now.
Here we have Frequency and Impulse responses. The Frequency Response is not Anechoic. In the Time Domain, Zoom both X and Y axes to fit your situation of impulse and reflections. Eventually temporarily select the Time Domain only Button for a bigger and more detailed Impulse. Activate Marker A, verify that the distance of the peak of the Impulse is what you expect, locate the first reflection, put the Marker A immediately before and click on the Set Stop Window Button .
In the status bar, information regarding the measurements and its processing are reported. With the stop window set at 8.75ms and an impulse arrival time of 1.8ms the low frequency reliability limit is around 150 Hz. We did not set the Start Window, because it does not change the Frequency Response. If you are interested in anechoic responses it is unlikely you need a bigger measurement size than 16k, but for room acoustics 64k is advisable.
4.4 WATERFALL The 3D decay of the anechoic response, known as the Cumulative Spectral Decay, is achieved by the Waterfall post processing. Open the measurement settings dialog and choose Waterfall. Input: Start Frequency 200Hz, Smoothing 1/3 Octave, Range 30dB. Click of the Waterfall button. Click with the mouse over it and enjoy.
4.5 IN-ROOM MEASUREMENTS We are going to execute two acoustical FFT measurements that characterize the quality of perceived sound and the room environment surrounding us. Both measurements are done at a listening position; the first tells us about the overall tonal balance and is done with third-octave RTA analysis; the second aims to give us an idea of room behavior with respect to decay of sound.
Close the dialog, set the Meter units to dBSPL, press the FFT Go button to start the analysis. Because the generator is still OFF you should be analyzing only the fluctuating noise of the room.
a new window should pop up, from here it is possible to generate the required signal for our analysis; choose Pink and select 64k Size from the drop down. Note that we left Averaging equal to 1 in the FFT settings because we are using a pseudo-random pink-noise stimulus of same length as the FFT size. Press Play; you should hear Pink Noise out of the speaker and view the RTA Frequency Response on screen, with the average level of the signal shown in the Meter box.
We are now ready for the second FFT acquisition. You may disconnect the power amplifier because now we will rely on an external stimulus by means of an inflated balloon. We are going to analyze the explosion of the balloon, which will give us a measure of the impulse response of our room. Open the FFT Option dialog and uncheck the RTA box, set the Event Trigger to Enable and One Shot, and input -5ms into the Delay edit box. Close the dialog.
Now take the balloon, handle it in a location as in photo, explode it.
As shown in the lowest curve above, you should see the impulse and its decay, with the acquisition stopped, because it was set to One Shot only. Above the impulse response is displayed the corresponding narrow-band FFT response. It is interesting to perform some decay processing on this acquired response. Open measurement Options again and choose the Waterfall tab. Set Start Frequency 50Hz, Stop Frequency 10000Hz, Smoothing 1/3 Octave, Range 40dB, Number of Spectra 120, Time Shift 5ms.
54 4 ENJOY CLIO POCKET CLIO POCKET - SURVIVAL GUIDE
5 REFERENCES [1] Joseph D'Appolito, “Testing Loudspeakers”, Audio Amateur Press, 1998. [2] Joseph D'Appolito, “Testing Loudspeakers at low Frequencies with CLIO” [3] Audiomatica Knowledge Base [4] Audiomatica Products Literature [4.1] CLIO 11 User's Manual [4.
56 5 REFERENCES CLIO POCKET - SURVIVAL GUIDE
