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Tenor 24bits Data User Guide

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1. Figure 28 Dialog box for waterfall graph scale adjustment The frequency and amplitude scales can be adjusted through the dialog box shown in Figure 28 The frequency scale can also be put in logarithmic mapping mode Note that no options are available for the time scale The waterfall graph is always generated for the entire framework The starting point and the length of the framework can be adjusted in the main interface see section 5 4 The Export txt function allows exporting the waterfall data in a text format 5 2 5 FRF Hx The FRF Hx module allows computing the average frequency response between channels The following figure presents the FRF module interface User Manual p 38 Tenor Data Logger Soft dB inc Figure 29 Interface of the FRF module At any time the computation parameters can be changed and the recompute button can be used to update the results The FRF interface has two graphs 1 The FRF graph to present the amplitude or the phase versus the frequency and 2 the coherence graph Three types of FRF can be computed H1 using this equation H1 y x Sxy Sxx H2 using this equation H2 y x Syy Sxy H3 using this equation H3 y x H1 H2 2 Where x is the reference channel and y the second channel In theory all Hx must give the same result However when the FRF contains resonance and or anti resonance the result can vary from one equation to another In effect noise on the X or
2. Mi 1 00 E 7 p 7 E dl E E E eo a y ENS EN AN Tan a tl thll FA WET ETI EI HAMM ATI A A PTT ULM UTI A PTT A Pl SA 100 00 1000 00 10000 00 100000 00 Frequency Hz Frequency Response Direct AC ICP Input Ml MELE ET M a Uv cn MAA M TO W W W 100 00 1000 00 10000 00 100000 00 Frequency Hz al MN il Mi al Bi Jenni p 58 Tenor Data Logger Soft dB inc Output Frequency Response Frequency Response Output AAA AAN e N WANE U T N Th tsa ae Amplitude dB IATA 1 00 10 00 100 00 1000 00 10000 00 100000 00 Frequency Hz a E a a a AM a _ a a User Manual p 59
3. 4 4 2 Global Indicators The global level and the dynamic range indicators share the same tab at the bottom of the acquisition interface A BA Ade 2 Al de a Af de i Af ds a Af ds En A as a des fa aa i y y T 2 i iesp 105 L L 105 1 105 iiser El 100 oe oe 13 2 p 132 133 a 1 39 2 Inf 3333 41234 6 22 4 7 23 6 Figure 13 Global Level indicators The global level indicators present the calibrated global level of all activated inputs The scale of the indicator is automatically set by the interface following the minimum and maximum global levels The user can select a dB dBA or linear display with the control at the upper left of each global level indicator The input number turns red when saturation occurs on a specific input The user can use the Reset Sat Indicators button to reset the saturation state see section 4 4 1 for more detail User Manual p 22 Tenor Data Logger Soft dB inc 4 4 3 Time Spectrum Indicators During acquisition four curves are available to display the time signal the global level historic or the spectrum of a selected input output These four curves are presented in two separate graphs The top graph presents the A and B curves while the bottom graph presents the C and D curves 15m a 500m 5m Gi E 0 ArI TA PT AN pT ie lA E e AS A a aL JHU 0 5m 10m l l l l l l l l l 15 20 25 30 35 40 45 50 55 60 65 70 T5 a0 85 90 943 lin lt __ log Time ms
4. When all output signal parameters are set and the output file path is specified the user can click on the Generate wav button to create the wave file These buttons allow saving and recalling the complete set up of the wave generator Also when the Generate wav button is used the wave generator interface creates a wgs file that contains the generator set up in the same folder as the wave file to be created This can be useful for determining the contents of a wave file generated by this module Note The post processing module can be used to apply some treatment on the output wave file For instance a high pass filter can be applied to a white noise to remove the low frequencies To do that simply open the wave file with the post processing module see section 5 0 for more details User Manual p 18 Tenor Data Logger Soft dB inc 4 4 Launching the acquisition and monitoring When the set up is done the user can click on the acquisition tab and launch the acquisition During acquisition the interface presents the following information 1 Input dynamic range and the global level of all selected inputs 2 Input saturation and percentage of saturation of all selected inputs 3 Up to four graphs of either the time signal the instant power spectrum the average power spectrum or the global levels historic The user can select the input output channel for each graph 4 The acquisition buffer state It allows verifying the real
5. o 5 10 A dBA Input Output select A In 1 i Global A 38 6 Type of graph Time a A Input Output select B In 2 v GlobalB Int A amp B Reset Ave AB Figure 14 Graph for A and B curves For both AB and CD graphs the user can select the input output and the type of curve Some other functions allow controlling the display and averaging process of AB and CD graphs The following table describes these functions IA A utoscale This button allows making an auto scale of the Y axis for the A B curves The auto scale is done once and the Y scale remains fixed after that As described later in this section there are some advanced functions that allow better control of X and Y scale This control allows selection of a linear a dB or a dBA display for both Y axes on the A B graph Input Output selecta Ing w These controls allow selecting the input output for the A and B Curves Input Output select B In i x Type of graph Time gt The type of display for the A and B curves are 1 Time signal 2 ARB Global Level Historic 3 Instantaneous Spectrum 4 Spectrum Fast Exponential Average 5 Spectrum Slow Exponential Average and 6 Average Spectrum The slow exponential average uses a time constant of one second while the fast exponential average uses a time constant of 1 8 of a second Note The Global Level Historic graph is limited to 6500 data to minimize the PC memory usage It means about 9 minutes of
6. Choose this option to select the device diver trom a list Windows does not guarantee that the diver you choose vall be the best match for your hardware lt Back J New Cancet_ Use the Browse button to specify the location of the USB driver for the Tenor unit Select the C Program Files Tenor_24Bit USBDriver folder or the one where you installed the software in step 2 and then click Next The driver is installed and the Tenor unit is ready to be used Click on Finish To test whether the Tenor Unit is properly installed go to My Computer Properties User Manual p 54 Tenor Data Logger Internet Internet Explorer E mail Outlook Express Set Program Access and i My Computer Defaults Open Explore Windows Update Search Manage MSN Expl xI piorar Map Network Drive Disconnect Network Drive Windows Media Player Show on Desktop Rename Microsoft Word O Bibliorom All Programs gt pe Log Off oJ Turn OFF Computer E Q k Outlook Express tal firstinstallprocedure MM Found New Hardware Right click on My Computer and select Properties System Properties System Restore Automatic Updates Remote General Computer Mame Hardware Advanced Device Manager 2 The Device Manager lists all the hardware devices installed on your computer Use the Device Manager to change the properties of any device Device Manager Drivers a Driver Signing lets you make sure that i
7. file in a SDF format The SDF format is a standard for the major spectrum analyzer manufacturers When a text format is chose for the export the following dialog box is used to specify the format of the data in the file User Manual p 51 Tenor Data Logger Soft dB inc Format 0 Line w Column Delimiter Tab ar Custom Delimiter Figure 37 Text format dialog box The data can be saved in line or column and the delimiter can be 1 a standard tab 2 a semi colon or 3 a custom delimiter If the custom delimiter option is selected the user has to specify the custom delimiter character User Manual p 52 Tenor Data Logger Soft dB inc Appendix A Tenor Driver and Software Installation Procedure The Tenor unit is not automatically recognized by Windows Follow each step below precisely to ensure proper installation of the system 1 Execute the Tenor24Bit_DataLoggerVer2_0 exe file see installation disk provided with the Tenor 2 Follow the installation procedure By default the Tenor software is installed in the C Program Files Tenor 24Bit directory Do not launch the software at this point the USB driver has to be installed beforehand 3 Apply power to the Tenor unit input 12VDC in the rear of the unit Use the power pack provided by Soft dB The Status Board LED of the Tenor unit should turn yellow 4 Connect the USB cable to the un25it USB input on the rear of the Tenor unit 5 Con
8. has a blue and red cursor The red cursor indicates the saturation limit and the blue cursor is used for playback see section 5 1 and extraction fonctions see section 5 4 Both graphs can be saved in a text file format using the following button Signal statistic data The main interface also presents the standard statistics of the entire signal or framework 1 33517m J 1 31125m_ l 2 78352m 1 11341m 833 909m Channel selection control Channel selection is done via the Ch Selection control Ch loz oS bs a Selection O 900 C E User Manual p 27 Tenor Data Logger Soft dB inc Cursor legend activation The next figure shows how to activate the cursor legend The cursor legend is activated by right clicking the graph The cursor legend will be presented at the upper right corner of the graph Note that all post processing module graphs have a cursor legend that can be activated this way Selected portion time signal selected by the green cursor 100m 50m a Copy Data Export Simplified Image Ln mn o 50m Description and Tip 100m Visible Items Plot Legend 150m I I l Scale Legend 00 00 00 00 00 02 00 00 04 00 00 06 00 00 08 00 1 Clear Graph Graph Palette Time hh ram ss Create Annotation Cursor Legend 2 Scrollbar Autoscale x Y e lt s Scale utoscale g J Y Scale lt Smooth Updates Figure 19 Activate the cursor legend with a ri
9. have not been applied and the statistics are not up to date After computation button Compute SO2637 the turns grey to indicate that the filtering operation has been done and the statistics are up to date Use the X Y and Z tab to see the statistics for all axes The Export txt function allows exporting the X Y and Z statistics in text format User Manual p 42 Tenor Data Logger Soft dB inc 5 2 7 Change Inputs Set up This function allows changing the input sensitivity the input description the unit name and the dB reference set up This function has been added to allow the calibration of an existing wave file which is not recorded with the Tenor system When opening an external wave file the Tenor system generates a standard associated configuration file with an input sensitivity of 1 Then the function Change Inputs Set up can be used to change the default sensitivity to obtain a calibrated signal We suggest to estimate the sensibility correction with a spectrum analysis through the function Average FFT The dialog box to change the inputs set up is shown on the next figure Input 2 oo E Inpute3 jolt oo E nputes it oo E Input 5 Volt E E oo E f Figure 32 Dialog box of the Change Inputs Set up function The input sensitivities can be changed with the Sensitivity control or using the dB control if the dB correction value is known in dB Note the Start Time control allows changing the starting time of the wave
10. historic at 48 8 kHz Reset Ave AB This control allows resetting the global level historic or the spectrum average of A B curves User Manual p 23 Tenor Data Logger Soft dB inc This control allows selecting a linear or log scale for the X axis This control state is not used when the time or historic graphs are selected Advanced display functions Some advanced functions can be used for both AB and CD graphs to manage the X and Y scale settings For instance an autoscale mode can be set for both Y axes by right clicking on the Y scale as shown in the next figure Marker Spacing p Add Marker Delete Marker AutoScale Y Figure 15 Set the AutoScale mode for Y axis The autoscale for the X axis can be activated by right clicking on the X scale Inst dB Parms 2 e A XX Marker Spacing gt Add Market Delete Marker When AutoScale mode is not set the user can change the minimum and maximum of all graph scales by editing these values directly on the scales as shown on the next figure Ui daha o a A lg Figure 17 Edit Y minimum value on the Y scale User Manual p 24 Tenor Data Logger Soft dB inc 4 4 4 Export Graphs When the acquisition has been completed the Export Graph function can be used to save the data of all four curves of the AB and CD graphs Export Graphs The data is stored in a text format file as described in the following table Graph CD Input output C name
11. or ICP the interface removes the DC component of the input signal before the dBFS computation In this way the dynamic indicator presents the range occupied by the AC part of the signal For the Direct DC input selection the DC is included in the dBFS computation In some rare circumstances when the DC signal is relatively high for the Direct AC or ICP input selections saturation can occur before the DC subtraction In these circumstances no AC saturations are detected but a saturation problem is present To avoid this saturation detection problem the interface tests the saturation before removing the DC component If saturation is detected at this stage the number of the corresponding input on the top of the dBFS indicator turns red In addition to the dBFS indicators the interface computes the percentage of saturation that occurs on all activated inputs This information is useful in determining the degree of the saturation problem A low saturation percentage for a specific channel can be acceptable some functions of the post processing interface can be used to avoid the saturations in the analysis The following button allows resetting the dBFS and percentage indicators User Manual p 21 Tenor Data Logger Soft dB inc The LEDs on the Tenor box are also useful for analyzing the saturation and low signal level problems The following table explains the meaning of the colour for input and output LEDs LED colour description
12. tania teeeeneataretanenete 41 O21 CHANGES INPUTS SEU its 43 5 0 FILTER AND INTEGRATION TAB 44 AE POT cesta a e E O E E L sige E AAE 45 933 2 HM MOGIA lcd id 47 54 SIGNAL EXTRACTION TAB aia ads 49 OEP OR TONE AB cla 51 APPENDIX A TENOR DRIVER AND SOFTWARE INSTALLATION PROCEDURE 53 APPENDIX B TENOR INPUT OUTPUT SPECIFICATIONS ccccesseeeeeeeeeeeeeeees 97 Tenor Data Logger Soft dB inc 1 0 Introduction The Tenor Data Logger from Soft dB is an 8 channel acquisition system that can collect data from different sensors ICP and pre amplified sensors This instrument is based on an external acquisition USB unit and a PC application and is suitable for acoustic and vibratory measurements The Tenor instrument has been designed to be a high quality acquisition system at a reasonable price This has been achieved through a careful selection of electronic components and by the design of an efficient communication architecture Combined with an easy to use PC interface the Tenor is a great alternative to expensive vibro acoustic acquisition systems by other major manufacturers Here are the main features of the Tenor system gt 8 analog inputs and 4 analog outputs gt Sampling rate of 48 8 kHz per channel gt 3 input types Direct DC Direct AC and ICP gt Realtime acquisition data logging for up to 8 inputs 4 outputs using the standard wave file format gt Realtime monitoring of input and output signals during a
13. text control can be used to specify the name of the unit The unit name is used by the acquisition system to label of the global level time and spectrum graphs For instance if a Pa unit is specified by the user for input 1 the Y label of the Spectrum will be dB Parms 2 Unit dBref The dB reference value E used Y ae mente for dB mon For acoustic User Manual p 11 Tenor Data Logger Soft dB inc PS measurement with a microphone the standard dB reference value is 2E 5 Sensitivity This is the sensitivity of the input measured in mV Unit The sensitivity is used by the interface to present a calibrated signal in the acquisition tab and post processing module The sensitivity can be manually entered if the value is known or automatically determined through the use of the calibration function via the Cali x button see next paragraph for more information on this function Calibration Function This function is used to determine the input sensitivity The calibration task is supported by a dedicated interface Note that a microphone or accelerometer calibrator is required The interface of the calibration function is presented in Figure 7 Figure 7 Calibration interface Before starting the calibration measurement the following calibrator parameters must be set up Calibration level The calibrator level can be defined in dB rms or as a linear rms value Use the menu on the right to specify if the calibrator le
14. the start and end points of the selected framework are sample numbers in the wave file This way the original wave file is never changed and an Undo operation is always available When an extraction has been done using the Extract between cursors function all functions and modules of the post processing interface will work with the new start and end points of the framework The save wav function will also take into account the starting point and the ending points After saving for instance the new wave file will contain only the selected portion of the signal of the original wave file Here is the detail of the extraction functions A O eee This function changes the start and end points of the framework following the blue and green cursor positions on the peak value The start and end points are changed for all channels Use the Undo Extraction function to cancel the extraction This function cancels the extraction s and resets the start point to zero and the end point to the end of the wave file For multiple extractions the undo operation always retrieves the entire wave file signal and not the preceding selection User Manual p 49 Tenor Data Logger Soft dB inc Extraction example The objective of this example is to keep the signal between time 00 03 50 and 00 06 00 First the blue and green cursors are moved to the desired start and end points Input 5 Figure 35 Extraction example first step cursor positio
15. Program Files Tenor_24Bit directory Do not start the Tenor software after finishing this step The USB driver has to be installed beforehand Step 3 User Manual p 4 Tenor Data Logger Soft dB inc STEP 2 Power the Tenor unit Connect the power supply to the Tenor unit using the 12Vdc 2 0A connector at the rear of the unit The Board Status LED on the rear of the Tenor unit should turn yellow STEP 3 Connection of the Tenor unit to the PC Connect the Tenor unit to a computer using a USB cable Windows will then ask for the Signal Ranger Mk2 Drivers The Signal Ranger Mk2 is the DSP Digital Signal Processor board on which the Tenor system is based The Signal Ranger Mk2 drivers are located in the C Program Files Tenor_24Bit USBDriver directory Follow the steps in Windows to select the appropriate directory and continue the installation At this point the Board Status LED on the rear of the Tenor should turn green and the software can be launched see section 4 0 User Manual p 5 Tenor Data Logger Soft dB inc 3 0 Hardware Description The hardware unit of the Tenor acquisition system is based on a USB DSP FPGA acquisition board It also includes an ICP conditioning board The metal box that contains the USB acquisition board is equipped with 12 BNC connectors for 8 inputs and 4 outputs The internal switches on the conditioning board allow selecting the Direct DC Direct AC or ICP input paths Each input and
16. Soft hh Tenor System 8 Channel Data Logger User Manual version 2 0e A ROHS COMPLIANT August 2009 Contents 1 0 INTRODUCTION oa 3 2 0 SOFTWARE AND USB DRIVER INSTALLATION c ccccceeeceeeseeeseneeeneeenes 4 3 0 HARDWARE DESCRIPTION consi ee eee 6 Se TECHNICAL DETAIL S ne nee eo ee ee ore ee ee 7 32 LEDINFORMATON 3 e a 8 4 0 USING THE ACQUISITION SOFTWARE c ccceseeeseeeeeeceeeceeeceeeceeseneseneeees 9 AST EAUNCHING THE TENOR SOFTWARE aa 9 42 SET UPINTERFACE Sita a 10 A EN A A 10 BZ 2 QUES AU A Ai io 11 A2 SOUPI SETUD A A tii 14 1 24 INDUC and OUMU F aS onea TA tiie Reeaainaiate 14 ES WAVE FIES GENERATOR lidia 16 4 4 LAUNCHING THE ACQUISITION AND MONITORING cccocccocccocococccnccccncnononcnoncncnnoconononononnns 19 4 4 1 Dynamic and Saturation IndiCatorS oooccoconoconncconoconicononconnonononanoncanonanoss 20 AA 2 GOD AMIN MICROS sl A AAA as 22 4 4 3 Time SpectruM INdICA OFS ooccconconncconcconcoonconnnonnconnnonononononoconnnnnonnnnornnnnnnnns 23 144 EXPO S ui id 25 5 0 POST PROCESSING as 26 91 PLAY WAVE FUNCTION aura A Aa 29 S Z ANALYSIS FUNCTIONS TAB aia 30 oy ad IDAS io 30 so BAe aa 1021 2 0 IR ay cal eee me mene ae Ree Oe eer ae ND ee ey Rime eee TD eee ee te ee eee 32 AS E A A RE A mE E T 34 A Waterfall AAA IA 35 ILIFE 2 P 6 ere PORT TT MEET eee O er eC nr men Eee Beene mere Re erE Te a eran 38 DZ OID A be tase tons aeuine e2ieoe usd ean aanbeadatea
17. Y channel on the anti resonance or resonance can distort the results The H1 equation is better when the noise is on the Y channel while the H2 equation gives better results when the noise is on the X channel User Manual p 39 Tenor Data Logger Soft dB inc The coherence graph allows determining if the signal measured on both channels is linked The equation used for the coherence is Coherence H1 H2 Sxy7 Sxx Syy Do Graph Autoscale Tthe Do Graph Autoscale button allows adjusting the Y and X scales of both the FRF and coherence graphs The next table explains the computation parameters This is the number of lines of the average FRF Possible selection are 1024 2048 4096 or 8192 lines The FRF calculation is done with a block size of 2 Nbr Lines This is the time window used for the Sxx Syy and Sxy Hanning computation This parameter allows adjusting the overlap between the time blocks used for the FRF calculation This parameter can be adjusted from 0 to 90 This parameter is used to increase the number of block used for the average calculation and to compensate for the loss of data that causes the time window The classic set up is an overlap of 66 and the Hanning window The dB Lin parameter allows choosing the amplitude scale format The choices are dB or Lin This parameter allows selecting the Hx H1 H2 or H3 Refer to the beginning of this section for computation technique detail H1 must be used i
18. ains red contact Soft dB User Manual p 8 Tenor Data Logger Soft dB inc 4 0 Using the acquisition software The next paragraphs present the set up and acquisition portions of the software The instrument set up functions and the acquisition interface will be presented in detail Post processing functions are not covered in this section this information is covered in section 5 0 4 1 Launching the Tenor software Connect the power supply to the Tenor unit using the 12Vdc 2 0A connector at the rear of the unit Connect the Tenor unit to a computer using a USB cable The Board Status LED on the rear of the Tenor unit should turn green Select and launch the Tenor_24Bit software via the Windows menu or at the default directory C Program Files Tenor_24Bit User Manual p 9 Tenor Data Logger Soft dB inc 4 2 Set up interface The Figure 4 shows the main interface just after launching the Tenor software General Set up Set up summary s I 4 7 catty EA Ea cai sym 3 cai m ainos fr os fioo can i impor save Output Set up Input and Output Paths 0 00 05 00 1468 a C Wsers Alexb Documentsitemp TestSystemAcqui wav C Users Alexb Documentsitemp Sinus wav Figure 4 Tenor Software Set up Tab The main interface has three tabs 1 the set up tab 2 the acquisition tab and 3 the post processing tab The set up tab allows specifying the configur
19. ation of the instrument Four groups of parameters are presented in this tab See next sections for details 4 2 1 General Set up General Set up Set up summary Figure 5 General Set up section User Manual p 10 Tenor Data Logger Soft dB inc The general set up group of parameters presents the application set up 4 2 2 Input Set up The input set up is done through the following section of the set up tab Inputs PETT ERC EII TT TC ETT IS TT CO ETT TS TT CO EXT TT Figure 6 Input Set up section Set up Parameters Each input can be activated or deactivated using the green dots on the left When activated the set up controls of a specific input become available The following table explains the set up parameters Range V This is the input range This set up is not adjustable Input Select There are three input types Direct DC This input type can measure the DC signal no high pass filter Direct AC This input type uses a high pass filter at 0 5 Hz and is suitable for AC signal measurements ICP This input type includes an integrated circuit preamplifier ICP with a high pass filter at 0 5 Hz A compatible ICP microphone or accelerometer can be connected directly to the BNC connector Input Description This parameter is a simple text control that allows the user to specify a description of the input This information has no impact on the behaviour of the acquisition system Unit Name This
20. available The Fc high parameter is available for the Bandpass and Bandstop selections only User Manual p 45 Tenor Data Logger Soft dB inc This parameter allows specifying the cut off frequency of Lowpass and HighPass filters and the low cut off frequency of Bandpass and Bandstop filters This parameter allows specifying the high cut off frequency of the Bandpass and Bandstop filters This parameter is not used for the Lowpass and Highpass selections This is the filter order This parameter is available for all filter type selections This parameter is used only for the Elliptic and Chebyshev filter types This parameter is the tolerable passband ripple of the filter It must be greater than zero and expressed in decibels This parameter is used only for the Elliptic and Inverse Chebyshev filter types This parameter is the desired attenuation in the stop band of the filter It must be greater than zero and you must express it in decibels All filter parameters can be saved and recalled using these buttons Note that the filter interface automatically creates a flt file when the filter operation is launched with the Apply Filter and Quit button This automatically saved flt file will have the name of the filtered wave file and it will be in the same folder This feature is very useful for following the filtering historic of a wave file This control allows selecting the group of channels to which the filter will be a
21. c of 2V Input impedance 1 kOhms For the direct DC Direct DC Input impedance 18 kOhms For both ICP direct AC inputs Direct AC and ICP Output impedance 0 3 Ohms Maximum 38 mA Input gain accuracy 0 05dB This is the precision of the input gain This result is for a calibrated Tenor The worse case is close to 0 05 dB Input offset accuracy 0 01 This is the precision of the offset Once calibrated the input offset should be close to zero with a precision of 0 01 This result is for a calibrated Tenor Input distortion 92 3dB 2Vpp This is the maximum amplitude of the harmonics when a 1000 Hz sine wave is present on an analog input 86 dB 4Vpp 81 4 6Vpp 77 8Vpp 76 3 9Vpp Output distortion 94 0 dB This is the maximum amplitude of the harmonics when a full scale 1000 Hz sine wave is generated by the analog output Input crosstalk 110 0 dB For this test a full scale sine wave 1000 Hz is applied on a specific input and the sine amplitude is measured on all others inputs Output crosstalk In noise On all output channels the bandwidth noise is greater than the cross talk User Manual p 57 Tenor Data Logger Soft dB inc Input Frequency Response The next figures present the frequency response for all input types Amplitude dB 5 00 4 00 3 00 2 00 Amplitude dB 2 00 3 00 4 00 5 00 User Manual 1 00 0 00 1 00 Frequency Response Direct DC Input
22. choices are dB dB A Lin rms Lin A peak or Lin rms The Integration parameter allows application of simple or double integration in the frequency domain for an o mt i i acceleration measurement For the simple integration option the power spectrum is divided by jw For the double integration option the spectrum is divided by This is the time window used for the power spectrum None computation User Manual p 31 Tenor Data Logger Soft dB inc This parameter allows adjusting the overlap between the time blocks used for the global levels historic calculation This parameter can be adjusted from 0 to 90 This parameter is used to increase the number of blocks and the time resolution of the historic graph We suggest to keep this parameter to 0 if standard acoustic signals are used A larger overlap can be used to avoid aliasing problem when the signal is impulsive The Export txt function allows exporting the global historic data in text format 5 2 2 Average FFT This function computes the average power spectrum for the entire framework of the selected channel First the time signal of the entire framework is divided into blocks of an adjustable number of samples The power spectrum is computed for each block and a linear average is obtained Also the Average FFT module allows the overlap of the blocks used for the average For instance the use of an overlap of 66 and the Hanning time win
23. cquisition time signal global levels historic and average Sxx gt Complete post processing module for signal analysis and playback functions This user manual explains in detail the use of the Tenor Data Logger software Note Be sure to install the USB driver before launching the Tenor software See section 2 0 for more details User Manual p 3 Tenor Data Logger Soft dB inc 2 0 Software and USB driver installation Do not connect the Tenor unit to your PC before installing the software and the Tenor USB driver Windows does not automatically recognize the Tenor unit and the wrong drivers could be installed Follow each step below precisely to ensure proper installation of the software and drivers on your PC See Appendix A for more details STEP 1 Installation of the Tenor Software 1 Launch the installation CD _ provided with the unit and click on Tenor24Bit_ DataLoggerVer2_0 exe You can also download the latest release of the Tenor software from the Soft dB website at http www softdb com SignalRangerMk2 Tenor24Bit DataLoggerVer2 0 exe 2 The following window appears WinZip Self Extractor Tenor2 4B1t_DataloggerVer _0 exe ln Installation of the Tenor 24 bit DataLogger software Cancel About Figure 1 Self Extractor message which appears during the installation process Click Setup and follow the installation procedure By default the Tenor software is installed in the C
24. cs of the global levels and presents a graph of the sorted global levels The interface of the Statistics function is presented in the next figure 13 Data Logger Tenor Al 59 37 48 69 f 303 33 46 433 99 2219 Figure 24 Statistics interface User Manual p 34 Tenor Data Logger Soft dB inc At any time the computation parameters can be changed and the recompute button can be used to update the results The next table explains the computation parameters The statistics are computed for all global levels of historic The time step of the global level historic can be adjusted between 50ms and 1000ms The dB Lin parameter allows choosing the amplitude scale format The choices are dB dB A lin rms lin peak or lin rms Integration The Integration parameter allows applying simple or ront double integration in the frequency domain for an acceleration measurement For the simple integration option the power spectrum is divided by jw For the double integration option the spectrum is divided by Export statistic The Export statistic function allows exporting the statistics in text format 5 2 4 Waterfall graph The Waterfall graph module presents the power spectra for the entire time length of the framework The Waterfall graph module computes the power spectra with an adjustable frequency resolution Each power spectrum is presented in a three dimensional graph along a time axis As wel
25. dow is a Classic set up that compensates for data lost in the time window The interface of the Average FFT function is presented on the next figure Figure 23 Average FFT interface User Manual p 32 Tenor Data Logger Soft dB inc At any time the computation parameters can be changed and the recompute button can be used to update the results Do Graph The Do Graph Autoscale button allows adjusting the Y and X scales for the new data of the average power spectrum graph The next table explains the computation parameters This is the number of lines of the average power spectrum The selections are 1024 2048 4096 or 8192 lines The FFT calculation is done with a block size of 2 Nbr Lines This is the time window used for the power spectrum computation This parameter allows adjusting the overlap between the time blocks used for the average power spectrum calculation This parameter can be adjusted from 0 to 90 This parameter is used to increase the number of blocks for the average and to compensate for the loss of data in the time window The classic set up is an overlap of 66 and the Hanning window Graph type This is the type spectrum Narrow Band octave 1 3 octave and 1 12 octave set ups are possible The octave 1 3 octave and 1 12 octave types are computed with a frequency bank of filters applied on the narrow band spectrum To avoid low frequency imprecision we suggest using the maximum numbe
26. f noise is on the second channel while H2 must be used if noise is on the reference channel H3 is an average of both H1 and H2 and can be used if the noise is on both channels These controls allow selecting the reference channel x and the second channel y User Manual p 40 Tenor Data Logger Soft dB inc These controls allow the integration of the inputs in the FRF calculation process This control can be used to select the format of the Y axis for the FRF graph The amplitude phase deg rad Im and Re formats can be used The function Export txt allows exporting the FRF the Phase Deg Rad Amplitude Im and Re and the coherence data in a text format 9 2 6 1502631 This function applies a filter and computes the statistics on three selectable channels following the 1502631 standard The next figure presents the interface of the ISO2631 module 00000000 ecVeesene 0600000090 Figure 30 Interface of the ISO2631 function User Manual p 41 Tenor Data Logger Soft dB inc The ISO2631 standard has one filter for the XY axes and another filter for the Z axis The following curves present the frequency response of these filters 1502631 filter frequency responses oS Z O eee NA CAY 0 01 0 1 1 10 100 1000 Frequency Hz Figure 31 Frequency responses of 1SO2631 filters Amplitude dB At start up the Compute ISO2631 button is yellow This means that the IS02631 filters
27. file This modification can be useful if absolute time scale for the global historic graph is desired User Manual p 43 Tenor Data Logger Soft dB inc 5 3 Filter and Integration Tab The Filtering and Integration tab at the bottom of the main post processing interface includes two filter functions that can be applied across the entire selected framework refer to section 5 4 for more information about the framework selection The Filter function is a generic filtering module while the Integral x t function allows making simple or double time integration on an acceleration signal Both functions filter the signal since the Integral x t makes the time integration with a filter A streaming technique is used to apply a filter on the entire framework Both filtering functions use the current wave file as a source for the filter and save the filtered signal in a new wave file The filtering operation starts at the beginning of the framework and is done on the entire framework If the current framework does not cover the entire signal of the original wave file the filtering operation will generate a smaller filtered wave file that contains only the filtered signal of the selected framework In this case and after a filtering operation the starting point of the framework is automatically reset to zero and the entire filtered signal is presented on the peak value curve Note that the original wave file is always conserved on the PC s hard d
28. ght click The cursor legend presents the cursor s X position and Y value The user can move the cursor to obtain a precise Y value reading at any X position The next figure shows the time graph with the cursor legend activated Selected portion of the time signal start at the green cursor position BH Cursor 00 00 44 892 67u 100m 50m go 50m 100m l l l l l l l l l l 00 00 44 00 00 45 00 00 46 00 00 47 00 00 45 00 00 49 00 00 50 00 00 51 00 00 52 00 00 53 00 00 54 Time hh mm ss Figure 20 Time graph with the cursor legend activated Functions Tab The Tab at the bottom of the main post processing interface contains the analysis functions A playback function is also available via the Play Wave button at the top right corner of the peak curve The next sections contain detailed descriptions of the playback function and all other analysis functions User Manual p 28 Tenor Data Logger Soft dB inc 5 1 Play Wave Function This function can be used to playback any portion of the selected channel The blue cursor of the peak curve is used to specify the playback starting point Playback is started with the Play Wave control Play Wave lt During playback the user can adjust the volume or pause playback by using the buttons in the following dialog box Figure 21 Main Post Processing Interface A forward button can be used during the playback and the speed of the forward can be adjusted w
29. input output D name X unit name CD Y unit name C Y unit name D Xcd 1 Yc 1 Ya 1 Xcd 2 Yc 2 Yd 2 Xcd n Yd n A tab character separates the columns and the text file can be opened directly in a standard spreadsheet program like Microsoft Excel User Manual p 25 Tenor Data Logger Soft dB inc 5 0 Post Processing The post processing tab includes a complete software tool allowing the analysis of a multi channel wave file The post processing can be used even if the external Tenor unit is not present The post processing interface accepts wave files recorded with the Tenor software and standard wave files Tenor recorded wave files always have an associated configuration file that contains the complete configuration of the instrument This configuration file is automatically saved in the same folder as the wave file at the beginning of the recording This configuration file allows recovering a calibrated time signal So any wave files not recorded with the Tenor system will not be calibrated the Change Input Set up function can be used to calibrate the signal see section 5 2 7 for more details The post processing module is accessible in the Post processing tab 13 Data Logger Tenor 24 Bits P 5 E 13 T _ G Users Alexb Documents SR2_AcquisitionDriver DataloggerAcoustic A Waves2_bit ConvertDemoFiles Tk5_ImpactNoise_32Bit wav Saturation Limit Figure 18 Main Post Processing Interface Note when the Post p
30. isk Note After the filtering operation the beginning of the signal can be distorted because of the impulse response of the filter applied We suggest removing the beginning of the time signal by using the time extraction function see section 5 4 for details The next two sections describe the filtering functions in detail User Manual p 44 Tenor Data Logger Soft dB inc 5 3 1 Filter The Filter function is very useful for removing some frequency components on a group of selected channels Some typical tasks that can be done with this function are a DC filter a notch filter to remove the 60 Hz and its harmonics and a low pass filter to remove high frequency noise for clearer playback This function has a filter design interface which is presented in the next figure 13 Data Logger Tenor oE PE ER Figure 33 Filter function interface The frequency response graph represents the filter response for the current filter parameters You don t have to use any button to update the frequency response graph the graph is automatically updated when the filter parameters change The filter parameters are described in the following table There are five available filter types 1 ButterWorth 2 Chebyshev 3 Inverse Chebyshev 4 Elliptic and 5 Bessel The filter function control allows selecting a Lowpass Highpass Bandpass or Bandstop filter When a Lowpass or Highpass filter is selected only the Fc low parameter is
31. ith the sliding control User Manual p 29 Tenor Data Logger Soft dB inc 5 2 Analysis Functions Tab The post processing module includes six analysis functions that are applied on the entire selected framework see section 5 4 for more information about the framework selection These functions are grouped under the Analysis Tab at the bottom of the main post processing interface The next sections describe these functions in detail 5 2 1 Global Historic This function allows building the global level historic with an adjustable time resolution for the selected channel The global level calculation is done with power spectra using blocks with a number of samples adjusted to match the requested time step The power spectrum approach is used to facilitate the A weighting and integration options The interface of the Global Historic function is presented in the next figure User Manual p 30 Tenor Data Logger Soft dB inc Figure 22 Global level historic module interface At any time the computation parameters can be changed and the recompute button can be used to update the results The Do Graph Autoscale button allows adjusting the Y and X scales for the new data of the global historic graph The next table explains the computation parameters The time step of the global level historic can be adjusted between 50ms and 60000ms The dB Lin parameter allows choosing the amplitude scale format The
32. l as the numerical amplitude scale a colour scale is employed to help in visualizing the high and low levels of the power spectrum amplitudes The three dimensional graph can be rotated zoomed and moved The next figure presents the waterfall interface User Manual p 35 Tenor Data Logger Soft dB inc 13 Data Logger Tenor Figure 25 Waterfall interface At any time the computation parameters can be changed and the recompute button can be used to update the results The next table explains the computation parameters This is the number of lines of the average power spectra Possible selections are 1024 2048 4096 or 8192 lines The FFT calculation is done with a block size of 2 Nbr Lines For a waterfall graph a large number of lines mean a poor time resolution Conversely greater time resolution results in lower frequency resolution Note that the overlap parameter can be used to limit this problematic This is the time window used for the power spectrum anaes This parameter allows adjusting the overlap between 66 the time blocks used for the power spectrum calculation This parameter can be adjusted from 0 to 90 This parameter can be used to increase the time resolution of the waterfall graph The dB Lin parameter allows choosing the amplitude scale format The choices are dB dB A lin rms lin peak or lin rms User Manual p 36 Tenor Data Logger Soft dB inc The Integration parame
33. lso includes the complete set up of all inputs User Manual p 13 Tenor Data Logger Soft dB inc 4 2 3 Output Set up To activate the output on the Tenor system the user must select the output s with the green dot and specify the path of a wave file that contains the signal to generate Read sections 4 2 4 and 4 3 for more information on the selection and generation of an output wave file Output selection is done through the green dots of the following section of the set up tab Figure 8 Output set up section The Current Output File Info indicator displays the parameters of the currently selected output wave file Be sure that the number of channels of the selected wave file matches the number of selected outputs before launching the acquisition The sampling frequency specified in the wave file is not the sampling frequency used during acquisition whatever the wave sample rate a sample rate of 48 8 kHz will be used To avoid frequency shift during generation with the Tenor make sure the wave file has been created using a sampling frequency of 48 8 kHz 4 2 4 Input and Output Paths The Tenor system uses the wave file format for recording and the signal generation Both the input and output file paths can be defined with the Output File Path and Input File Path browsers use the folder icon to access the browser If the acquisition is started with the Start Stop with input log button the interface creates a wave file to save
34. meters are described in the following table A simple or double operation can be done A first simple integration or second order double integration filter is used following this parameter This is the cut off frequency for the filter used in the integration process We suggest using an Fcut Hz parameter that fits with the sensor used A typical accelerometer sensor has a flat frequency response that starts at around 20 Hz User Manual p 47 Tenor Data Logger Soft dB inc 0000000 This control allows selecting the group of channels for which the integration will be done This button launches the integration operation User Manual p 48 Tenor Data Logger Soft dB inc 5 4 Signal Extraction Tab The signal extraction tab includes a function for extracting a portion of the signal This feature is very useful for analyzing a portion of the wave file and for removing the beginning of a wave file after a filtering operation Also a saturated portion of the signal can be excluded for better analysis a 1 Analysis functions Filtering and Integration Signal Extraction Export 5ay ay The extraction is done on signal of all channels The Function Undo allows recovering the original way File The extraction can be cancelled at any time and the entire framework of the original wave file will be recovered The extraction technique is based on the use of file pointers This means that
35. nect the other end of the USB cable to the USB port of your PC Windows indicates that a new peripheral has been detected Follow the procedure below Found New Hardware Wizard Welcome to the Found New Hardware Wizard Windows will search for current and updated software by looking on your computer on the hardware installation CD or on the Windows Update Web site with your permission Read our privacy policy Can Windows connect to Windows Update to search for software Yes this time only O Yes now and every time connect a device Click Next to continue Check No not this time and then click on Next User Manual p 53 Tenor Data Logger Soft dB inc Found New Hardware Wizard This wizard helps you install software for Signal_Ranger_mk2 If your hardware came with an installation CD 142 or floppy disk insert it now What do you want the wizard to do Install the Click Next to continue Check Install from a list or specific location Advanced and then click on Next Found New Hardware Wizard Please choose your search and mstallation options Search for the best driver in these locabons Use the check boser below to lent of expand the default search whech includes local paths and removable media The best diver found wall be installed Search removable media floppy CD ROM C Program Files Tenor_24Bit USBDriver O Dont search wil choose the diver to install
36. ning Then the Extract between cursors button is used to launch the extraction After extraction the peak value graph looks like this I Input 5 E aturation Limit se l i Figure 36 Extraction example Peak value graph after the extraction User Manual p 50 Tenor Data Logger Soft dB inc 5 5 Export Save Tab The Export Save tab includes five functions to export the time signal data to a text file a wave file or a SDF file Standard Data File from HP Here is a description of the Export Save tab functions This function exports the selected channel to a text file The exported signal is calibrated and the format of the text file can be adjusted through a dedicated dialog box This function saves only the selected framework This function exports all channels in a text file The exported signals are calibrated and the format of the text file can be adjusted through a dedicated dialog box This function saves only the selected framework This function allows saving the selected channel in a wave file This function also saves the associated configuration file for further analysis with the post processing interface This function allows saving all channel signals of the selected framework in a wave file This function also saves the associated configuration file for further analysis with the post processing interface This function allows saving all channel signals of the current selected wav
37. nstalled drivers are compatible with Windows Windows Update lets you set up how Windows connects to Windows Update for drivers Hardware Protiles Hardware profiles provide a way for you to set up and store different hardware configurations Hardware Profiles x Apply Click on Device Manager in the Hardware tab User Manual Soft dB inc p 55 Tenor Data Logger Es Device Manager File Expand the USB tree and check for the following entry User Manual Action View Help Hee Monitors Be Network adapters eh Other devices r Network Controller PCMCIA adapters Ports OOM amp LPT Processors D Sound video and game controllers S Storage volumes a System devices Universal Serial Bus controllers Generic USB Hub Intel 2230108 D86M USB 2 0 Enhanced Host Controller 24D Intel r 8260106 D6M USE Universal Host Controller 242 Inter 82801D6 D6M USB Universal Host Controller 2404 Inter 8280106 D6M USB Universal Host Controller 247 Signal _Ranger_mk2 USB Root Hub USB Root Hub USB Root Hub USE Root Hub Soft dB inc Signal_Ranger_mk2 p 56 Tenor Data Logger Soft dB inc Appendix B Tenor input output specifications Direct AC Direct DC and 105 0 dB This is the signal to noise ratio for the analog input This ICP inputs SNR result is for an output dynamic of 4 5V 105 0 dB This is the signal to noise ratio for the analog output This result is for an output dynami
38. option is set to on First measurement file name test wav Second measurement file name test_001 wav Third measurement file name test_002 wav User Manual p 15 Tenor Data Logger Soft dB inc 4 3 Wave Files Generator The Tenor system includes a dedicated module for creating a multi channel output wave file The next figure presents this module Figure 10 Wave Files Generator interface The sample rate is the current sample rate of the instrument it is not adjustable here Here is the description of the controls This is the duration in seconds of the wave file to be generated This is the global delay defined as the number of samples The wave file will include this number of zero on each activated channels before the beginning of the output signal A set up of 27 samples is recommended This way the global group delay between the outputs and inputs is exactly compensated User Manual p 16 Tenor Data Logger Soft dB inc C Users Alexb Documents temp sinus wav This is the output file path At the start up of the generator interface the path is set to the current output file path of the main interface The user can change the file name with the folder icon Uniform White Noise Each output channel can be activated with the green dot Then the output signal parameters are accessible for this selected channel The following table p
39. output has a LED to indicate saturation or a low level problem dB Tenor Figure 2 Tenor Hardware Unit front User Manual p 6 Tenor Data Logger Soft dB inc Figure 3 Tenor Hardware Unit rear 3 1 Technical details Here are the hardware technical details e External board with a USB link for realtime acquisition e 8 analog inputs and 4 analog outputs e Sampling rate of 48 8 kHz per channel e SNR 105 dB input and 105 dB output e 3 input types Direct DC Direct AC and ICP e Input dynamic range 4 5 V e Output dynamic range 2V e Anti aliasing filter on outputs and inputs Note See Appendix B for more input output specifications User Manual p 7 Tenor Data Logger Soft dB inc 3 2 LED information The LED colour and description are presented in the following table Description of colour meaning ewe mow can Measuring Overload Input s saturated A Acquisition ON System Status BoardorF lt Software OFF Software ON Board Status rear PC connected Additional note for the Status Board LED e A Green LED means that the computer is connected to the Tenor unit and that the drivers are operational e A Yellow LED means that either the computer is not connected to the Tenor unit or that the USB drivers are not operational See Appendix A for more information e A Red LED means that the Tenor unit has detected an error Try switching the power supply off and on If the Status Board LED rem
40. pplied Note that the non filtered channels will be included in the wave file created by the filter function Apply Filter and Quit This button launches the filtering operating The original wave file will be used as a source for the filter and the filtered signal will be saved in a new wave file Also a flt file containing the filter parameters is automatically created in the same folder that the filtered wave User Manual p 46 Tenor Data Logger Soft dB inc 5 3 2 Integral x t This function performs a time integration on the signal of a group of selected channels Some modules in the analysis functions tab allow integration in the frequency domain This function is useful for analyzing the signal coming from an accelerometer especially if the speed and position must be analyzed in the time domain There are many available techniques for performing time integration We select the filtering approach which has the advantage of being numerically stable So a simple first order or second order low pass filter is used to perform a simple or double integration The user must specify a cut off frequency for the filter We suggest using an Fcut Hz parameter that fits with the sensor used A typical accelerometer sensor has a flat frequency response that starts at around 20 Hz The interface of the ntegral x t function is shown in the next figure 2 S00DODODO In Figure 34 Time integration function interface The para
41. r of lines 8192 set up when an octave type is selected Narrow Band The dB Lin parameter allows choosing the amplitude scale format The choices are dB dB A lin rms lin peak lin rms IS02631 XY dB IS02631 Z dB ISO2631 XY lin rms et lin peak and ISO2631 Z lin rms et lin peak The ISO2631 selections allow applying standard frequency weighting to the average power spectrum The Integration parameter allows applying a simple or double integration in the frequency domain for an acceleration measurement For the simple integration option the power spectrum is divided by jw For the double integration option the spectrum is divided by User Manual p 33 Tenor Data Logger Soft dB inc The function Export txt allows exporting the average power spectrum in text format 5 2 3 Statistics This module allows computing the standard Lx statistics on the global level historic for the entire framework of the selected channel The Statistic function starts by computing the global levels of the framework with an adjustable time resolution The global level calculation is done with power spectra using blocks with a number of samples adjusted to match the requested time step A Hanning time window is used for the FFT computation The power spectrum approach is used to facilitated the A weighting and integration options When the global level historic is computed the Statistics module computes the Statisti
42. r Data Logger Soft dB inc The next figure presents the acquisition tab of the main interface LALA i nc ies MOM ray Es pa ras SS L aes So M pr e E ence i J E poni ne Er a i E 4 P i pa Sas peers atk Figure 11 Acquisition tab of the main interface The following sections explain in detail the indicators and functions of the acquisition tab 4 4 1 Dynamic and Saturation Indicators The dynamic and saturation indicators of the acquisition tab along with the LED indicators of the Tenor unit are very useful to detect the dynamic range problems These indicators are located in the bottom of the acquisition tab be sure to select the Dynamic Range Tab and not the Global Levels Tab User Manual p 20 Tenor Data Logger Soft dB inc 1 o o o o o o o Figure 12 Dynamic range and saturation indicators Each dynamic range indicator has two bars The yellow bar is the maximum peak value measured since the beginning of the acquisition This yellow bar turns red if saturation occurs The blue bar is the current peak value of the current acquisition block The peak values are presented in dBFS This is the dB computed with the full scale peak value as a reference aBFS 20Log 0 5 Where 24peak is the peak value of the current acquisition block in the range of a signed decimal 24 bit number 2 and 2 The dB calculation is done with the full scale peak value reference 2 When the input type selection is Direct AC
43. resents the available signal types and their set up parameters Signal type Amplitude volts Frequency Hz Duty cycle Standard deviation Triangle Wave Maximum 2V Triangular pattern frequency Square Wave Maximum 2V Square pattern The percentage of frequency time a square wave remains high versus low over one period Saw tooth Wave Maximum 2V Saw tooth pattern frequency Uniform white Noise Gaussian White Maximum 1V Standard deviation Noise of the distribution Periodic Random Maximum Noise 0 0104167V User Manual p 17 Tenor Data Logger Soft dB inc Repetitive Impulse Maximum 2V Frequency of the pattern repetition For Gaussian White Noise the maximum output voltage is limited to 1V instead of 2V The distribution of this type of noise can exceed the nominal requested amplitude A maximum of 1V for the nominal amplitude allows avoiding the saturation for an output with a dynamic range of 2V This value is for a block length of 4096 or 2048 FFT number of lines This is the maximum amplitude at each frequency With this maximum amplitude for each frequency of the noise the signal will cover the entire output dynamic of 2V This control allows specifying the block length during the wave file generation This control is especially important for the pseudo random noise Effectively to take advantage of the pseudo random noise the acquisition block length must fit the generator block length Generate
44. rocessing tab is selected the interface automatically asks for a wav file User Manual p 26 Tenor Data Logger Soft dB inc Peak and time signal graphs The approach used by the post processing module allows the analysis of a large wave file the wave standard allows a maximum size of 2GB for a wave file about 3 0 hours at 48 8 kHz The use of a streaming approach solves the memory limitation problem met when a large wave file is used This means that the whole signal contained in the wave file is never completely loaded in the PC s memory The post processing always reads the signal block by block With this streaming technique the memory requirement problem is solved but the user loses the overview of the entire signal contained in the wave file To resolve this problem the post processing interface presents the peak values of the entire wave file The peak value curve always contains 8192 points This means that the entire signal is divided in 8192 blocks and the peak values of each block are used to form the peak value curve This way the user has an overview of the signal and low and high portions of the signal are easily detected For a more detailed view of some portions of the signal the post processing presents a time signal curve with a maximum length of 60 seconds defined by the Length of Signal s control The starting point of this time signal is specified with the green cursor of the peak value curve The peak graph also
45. ter allows applying a simple or double integration in the frequency domain for an acceleration measurement For the simple integration option the power spectra are divided by jw For the double integration option the spectra are divided by w At the time of the computation and if the framework has a considerable amount of data the interface asks the user for using a spectrum averaging The amount of spectra for the waterfall graph is considerable 1228 Spectra of 1024 lines The waterfall graph display will be slow Do you a e e O Figure 26 Dialog box for spectrum averaging If the user clicks Yes the software will perform a spectrum averaging to reduce the amount of data In this case the time resolution of the waterfall graph will be reduced However the user can adjust the averaging rate with the button Number of spectra Then the number of spectra and the averaging rate can be adjusted with the following sliding control Number of spectra 204 Figure 27 Dialog box for adjusting the number of spectra Adjust scales The Adjust scales button allows setting the frequency and amplitude scales of the waterfall graph Unlike on the other two dimensional Tenor software graphs minimum and maximum scale values cannot be changed directly on the waterfall graph The minimum and maximum values for each scale can be changed using the following dialog box User Manual p 37 Tenor Data Logger Soft dB inc
46. the input signals in 32 bit format If an output wave file is specified the interface sends the signals in the wave file to the selected outputs even in no log acquisition mode The output signals are always generated at the Jenor sample rate Be sure to use a wave file with the same sampling frequency to avoid frequency shift during generation with the Tenor The Tenor system includes a wave file generation module that can be used to create a multi channel wave file for the outputs see section 4 3 for more details Once the output file path is defined the Current Output File Info indicator displays the parameters of the current output wave file number of channels sample rate and the time length User Manual p 14 Tenor Data Logger Soft dB inc The interface uses the extended wave format that supports multi channels and continuous sampling frequency adjustment Windows with DirectX 8 0 module supports this format A 00 45 48 1 076 2 C Users Alexb Documents temp test wav C Users Alexb Documents temp Sinus wav Figure 9 Input and Output Paths section Note If the Auto Increment option is used the Tenor software automatically adds a number to the input wave file name at each new measurement This way the name must be defined only for the first measurement All others measurements will be logged in a wave file with a three digit extension number For instance if the name specified is test wav and if the Auto ncrement
47. time acquisition data logging Most of the time the real time acquisition data logging is achieved but some events like a background software request an Internet access or a standby operation can limit the real time The acquisition buffer is there to avoid the lost of data during those special events the length of the buffer is 84k samples by channel When the buffer is full the real time acquisition is not achieved anymore In this case the acquisition buffer state turns red Note some computers are not enough powerful to allow the real time acquisition on all channels In this case we suggest disabling the display control Graph Update At OFF during the acquisition to regain the real time acquisition During acquisition the set up portion of the instrument is no longer available and the interface switches to the acquisition tab The user must stop the acquisition to change the instrument set up The acquisition can launched in two modes Start Stop no input log 1 No Log mode In this mode no wave file is created by the interface during the acquisition However output logging is activated if an output wave file has been specified This mode is useful for testing the input dynamic and for using the Tenor as a simple generator Start Stop with input log 2 Log mode In this mode the instrument generates a wave log file Also output logging is activated if an output wave file has been specified User Manual p 19 Teno
48. vel is in dB or a linear value User Manual p 12 Tenor Data Logger Soft dB inc Frequency Hz This is the calibrator emission frequency typically 1000 Hz in the case of a microphone dBref This is the reference value used for the dB computation typically 2E 5 for a microphone When the calibrator set up has been done the average time parameter must be set A short average of 5 seconds is usually appropriate Then the averaging process can be launched with the button Start Cali Start Cali Reset Cali At the end of the average the interface computes the required sensitivity to set the calibrator level to the specified frequency 1 00k Pao Click the Ok button to accept the new sensitivity value and return to the main interface Import Save sensor bank The mport and Save sensor bank functions are very useful for simplifying the input set up The save function allows saving the complete configuration of a specific input Range V Input Selection Input Description Unit Name dBref and Sensitivity The Import function allows recalling the input configuration saved in a sen file Before starting to use the Tenor system we suggest taking some time to generate a sen file for all your Sensors Note also that the entire set up of the Tenor instrument can be saved in a cfg file and recalled from one measurement session to another This configuration file created with the Save cfg button a

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