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36 

divided by the input Spectrum Sx(f).   

Sy/x(f) = Sy(f)/ Sx(f) 

FRF is a complex function that is often used for modal analysis or operational 

deflection shape analysis. 

 

Coherence Hxy(f)

: The coherence function is an indication function that 

describes the relation of two signal.     

Hxy(f) = (|Sxy(f)|)/(|Sx(f)| |Sy(f)|) 

The value of Coherence is between 0 and 1.    When the two signal x(t) and y(t) 

is completely correlated, its value is 1.0. When the two signals are 

un-correlated, the function is 0.    It is usually used as and auxiliary function for 

examining the quality of tests. 

 

Orbit x(t) versus y(t): 

Orbit function is a XY plot of two time waveform.   

Usually the orbit function is used to describe the vibration tracks of a rotating 

shaft.    Note that the orbit function always shows channel 1 and channel 2 

data as a pair, and channel 3 and channel 4 data as the other pair. 

 

4.14  

Selecting the type of Y axis from Trace Setup menu 

 

Tap the icon or use the navigation keys to select the type of Y axis.    The Y 

Axis functions will show what is available for each selected function.   

 

Function: 

 

Available selections for each function 

Spectrum -   

Linear, Log, dB, Real, Imaginary, Phase 

Auto Spectrum -  Linear, Log, dB 

Time-     

 

Real, Windowed 

FRF-     

 

Linear, Log, dB, Real, Imaginary, Phase 

Cross-   

 

Linear, Log, dB, Real, Imaginary, Phase 

Coherence -   

Linear, Log 

 

 

 

Содержание Impaq Elite

Страница 1: ...Elite Dynamic Signal Analyzer User Manual Edition January 2011 Benstone Instruments Inc 32905 Northland Court St Paul MN 55045 Telephone 651 257 6500 www benstone com Copyright 2005 6 all rights rese...

Страница 2: ...N BETWEEN ACTIVE AND INACTIVE DISPLAYS 15 4 4 MAXIMIZE AND RESTORE A WINDOW 15 4 5 SOFT KEY MENU FILE 18 4 6 SOFT KEY MENU SETUP 21 4 7 MODE MENU SELECTING SINGLE BLOCK OR WATERFALL ANALYSIS 21 4 8 ME...

Страница 3: ...3 4 18 WATERFALL MEASUREMENT 43 4 19 STEP CONTROL OF WATERFALL MEASUREMENTS 43 4 20 NAVIGATING THE DISPLAY OF WATERFALL PLOT 44 4 21 TOOLS 48...

Страница 4: ...ne Instruments Dynamic Signal Analyzer is very flexible Your system may have come with only one software feature but the Impaq Elite is designed for easy upgrade of software features as needed by the...

Страница 5: ...can do please feel free to call or Email us Telephone 651 257 6500 Fax 651 357 4004 Service or Calibration support benstone com General information info benstone com Or you can visit our website at ww...

Страница 6: ...rd ware features Detail of the individual operation of each function will be described in later chapters 2 1 Layout of the Impaq Elite Connectors Storage card and USB 1 1 connector Main keypad Functio...

Страница 7: ...window OK key Use this key for the following operations Enter or confirm a selection Call out the trace setup menu Cancel Key Use this key for the following operations Escape or abort from a menu Back...

Страница 8: ...play Either way you can choose the method that best fits your needs 2 4 Connectors On top of the Impaq Elite is a series of connectors to provide an interface to accept external signals usually from y...

Страница 9: ...con to run a program Your display will show the icons of programs installed You may only have one program or may have several programs depending on what was purchased At the lower right corner you can...

Страница 10: ...red color It is normal that the casing of the instrument gets a little bit warm during charging You can also charge the battery or a backup battery via an optional charging station You can extend the...

Страница 11: ...RS 232C to Printer DSP Processor Texas Instruments TI TM S320C6713 External Memory CF Card up to 8 GB memory Battery Lithium ion 8 4V 5400 mA hr Rechargeable PC Interface USB 1 1 Mini B type USB Conne...

Страница 12: ...n the Utility software there are three main menus System Menu Option Menu and Program List 3 1 System Menu The system menu displays information about the internal components of your Impaq Elite 3 2 Op...

Страница 13: ...o version of a particular software the time lock will display how much remaining time is left If you need to get a demo program for evaluation please contact Benstone Instruments for help To install a...

Страница 14: ...below shows the measured data in either one or two windows depending on your setup You may select one of these data windows as active while the other window is inactive The active window has a deep b...

Страница 15: ...area or by using the navigation keypad to move up or down Note only one display is active at any one time Select active window by tapping the screen Select active window by navigation keys 4 4 Maximiz...

Страница 16: ...bar In this example the upper window is active When the upper window is active use the navigation keys and move up to maximize it Move down to restore it When the bottom window is active use the navig...

Страница 17: ...ollowing flow chart shows how to select the active window and maximize or restore its size by using navigation keys upper lower upper lower upper lower upper lower upper lower No change upper lower No...

Страница 18: ...en or press F1 key to open the file menu Press cancel key or tap the file button again to close the window Exit Exits this program About Displays the software and firmware version Filename Options Whe...

Страница 19: ...ther directory if desired Note You can always remove the compact flash card from the impaq Elite and then perform these functions from your PC File Manager View Menu Selecting View allows you to arran...

Страница 20: ...nto a fs2 file You can save the setup rename the file name or create a new directory as shown in the previous pages Open Data Selecting Open Data to open a saved data file as well as the associated se...

Страница 21: ...he submenu selection Save to Default save the current setup parameters to the default fs2 file Load Default Load the setup parameters from the default fs2 file 4 7 Mode menu Selecting single block or...

Страница 22: ...uency Band Band Select 50 Hz 100 Hz 200 Hz 500 Hz 1 kHz 2 kHz 5 kHz 10 kHz 20 kHz 40 kHz via the pull down panel Lines Select 100 200 400 800 1600 3200 6400 12800 lines of resolution via the pull down...

Страница 23: ...t it For example this is usually used for an impact test It enables you to preview the time waveform and screen out the bad data which might be caused by a double hitting or overloading signal Overloa...

Страница 24: ...ay between 99 to 99 Tacho Pulses Revolution Via the Navigation Keypad press OK You will see an input panel to enter the number of pulses per revolution If the rotation speed needs to be measured the p...

Страница 25: ...nput Range Select Auto Up Only 10 mV 20 mV 20 mV 50 mV 100 mV 200 mV 500 mV 1V 2V 5V 10V or 20V This should match the output of the device that you are connecting to Up only is typically used with mod...

Страница 26: ...and 999 Direction You can select one of the directions from a pull down menu X X Y Y Z Z R R T T P P These point ID s and direction labels are used for modal or ODS testing work The point ID s will be...

Страница 27: ...main display Local Soft Key Menu Return Assign Single Assign All Return Selecting the Return function returns you to the Setup menu Selecting return again returns you to the live display Assign Singl...

Страница 28: ...played and weighting that is to be used as well The Impaq Elite is designed to support a wide range of sensors from Accelerometers to 200V microphones From the pull down menu select Select Sensor Type...

Страница 29: ...nes the position of 0 dB For an acoustic signal the dB reference is set at 2e 05 PA Int Diff To show the mathematical relationship between the SU Sensor Unit and the DU Display Unit this could be inte...

Страница 30: ...or You have complete control over the input of the sensor values in your measurement It should be cautioned that inaccurate scaling factors will result in bad test data You can also add Sensor units a...

Страница 31: ...utton on the left hand side of the window to display the menu too Detailed instructions about the trace setup menu will be given in the following paragraphs Band Limit Select this option will enter th...

Страница 32: ...o determine the desired range of the X Axis Fix Y Define a fixed range for Y Axis When you select this function a screen will pop up prompting you to enter Y1 and Y2 to determine the desired range of...

Страница 33: ...first order to another position Peak Displays only the peaks Whey you move the cursor it will jump from one peak to another Hot Key of Cursor By pressing the dot key you will be able to toggle to eac...

Страница 34: ...e data window 4 12 Trace Setup Select the Trace Setup icon to enter the menu of Trace Setup From this menu you can setup the display format for the active window You can tap the arrow button on the le...

Страница 35: ...ired it is recommended to use the auto power spectrum Power Spectrum Sxx f This is also known as Auto Power Spectrum Sxx f is defined as Sxx f Real Sx f 2 Imag Sx f 2 The Auto Spectrum is a real funct...

Страница 36: ...tests Orbit x t versus y t Orbit function is a XY plot of two time waveform Usually the orbit function is used to describe the vibration tracks of a rotating shaft Note that the orbit function always...

Страница 37: ...dently i e only look at Channel 3 for example You may also hold a data trace for overlapping and comparison purpose The hold trace feature will be preserved even when you start a new measurement or op...

Страница 38: ...may indicate one of the following conditions Short circuit low bias This phenomenal usually indicates a bad cable with short loop Normal normal bias The IEPE circuit is working normally Open circuit h...

Страница 39: ...precise frequency you can determine which frequency belongs to which rotating device RPM ON Selecting the RPM On will display the RPM value of the external trigger channel in the status bar Time in D...

Страница 40: ...ou created will be saved in your instrument Calibration Selecting Calibration is for calibrating a sensor adjusting the sensitivity When you require sensor calibration prior to measurement this proced...

Страница 41: ...le of acoustic calibration the input value is 94dB but your value may be different due to equipment and calibration 4 Press the OK key to leave the calibration table The new sensitivity value of each...

Страница 42: ...All Marks to delete all the cursor labels 4 17 Status Bar The Status bar displays the status of the system When the channel icon shows abnormal conditions please stop measurement and correct the prob...

Страница 43: ...am takes measurements according to the rpm reading of tacho input Start RPM Set the rotation speed when the measurement begins Stop RPM Set the rotation speed when the measurement stops Delta RPM Set...

Страница 44: ...only when the user pressed Stop button Delta Second Define the span of time between each measurement 4 20 Navigating the Display of Waterfall Plot Because the File and Setup menus in waterfall mode i...

Страница 45: ...on the top The intensity map is an alternative form of waterfall plot which shows the intensity of amplitude with colors Trace Only Selecting this option will close the waterfall or intensity map plo...

Страница 46: ...rm the change or press Cancel to exit Y Axis Select the scale of Y axis to be linear log or dB Y Scale Select this option to adjust the range of Y axis Auto Conduct auto scaling on the Y axis Bottom U...

Страница 47: ...own for quick access to this function Fixed Select this option to specify the range of Y axis When you tag this icon it will display a table for you to input the minimum and maximum value of Y axis RP...

Страница 48: ...elect black or white back ground color for the data window 4 21 Tools The first 3 options of Tools menu have been discussed in the previous paragraph Please reference to Section 4 16 The other two opt...

Страница 49: ...49 Data Recorder program...

Страница 50: ...ne A Pane B Pane C and Pane D respectively You may select one of these data windows as active while the other window is inactive The active window has a deep blue title bar while the inactive window h...

Страница 51: ...hen use the navigation keys to move the red focus to the selected window Press OK to confirm your selection Use Touch Screen Tag the selected window to make it active 4 25 Maximize or Restore an Activ...

Страница 52: ...rogram About Displays the software and firmware version File Property Show the property of current file File Manager The file manager is an utility to cut copy paste delete new folder or rename File M...

Страница 53: ...etup to open a setup file fs2 and apply its setup parameters to the FFT program Save to Default Saves the current setup parameters to the default file DEFAULT FS2 Next time you access the FFT program...

Страница 54: ...Recorder program the system will create a temporary new file called untitled drd which contains no data in it Check file property After you perform a data recording the archived data is saved to the T...

Страница 55: ...ou select a frequency band which exceeds the above limitation you can still conduct data recording However when the buffer memory is full the system will stop the recording procedure Stop at Select a...

Страница 56: ...band you selected is within the limitation described in the previously you don t have to select this item In case the selected frequency band is over the limitation you can try this item to compress t...

Страница 57: ...menu Selecting return again returns you to the live display Assign Single This feature speeds up the entry requirements for channel setup Assign single will assign that parameter selected for the col...

Страница 58: ...ime domain Spectrum Select to monitor the recorded signal in frequency domain Resolution Select the resolution of the spectrum and points of block data to be 100 lines 256 points 200 lines 512 points...

Страница 59: ...r Peak Hold Instant Mode The Bar Charts show the instant level of input signals Peak Hold Mode The Bar Charts hold and show the maximal levels of input signals Hold Overload Select this option to hold...

Страница 60: ...w calibration values for the calibration signal In the example of acoustic calibration the input value is 1 Pa but your value may be different due to equipment and calibration 5 Press the OK key to co...

Страница 61: ...t Power to check the IEPE power supply of your Impaq Elite To conduct the checking discount all sensors and select Verify In normal condition the power supply of all channels should be around 24 7 Vol...

Страница 62: ...t key to playback the data file Fast Forward Select this soft key to toggle the playback speed by 1X 2X 4X or 8X Fast Backward Select this soft key to play data backward and toggle the playback speed...

Страница 63: ...listing the A acceleration V Velocity or D Displacement Selecting A V or D will toggle the display to the units selected Pressing the bar chart button will display the graph area in a bar chart Pressi...

Страница 64: ...ssing Select All will select all files in the directory or Unselect will unselect all files selected After you have selected the files you can cut copy paste or delete the files into another directory...

Страница 65: ...a VST file You can save the setup rename the file name or create a new directory as shown in the previous pages Open Data Selecting Open Data to open a saved data file as well as the associated setup...

Страница 66: ...sor Unit SU Sensitivity mV Su IEPE Power and Auto Range checkbox for defining the measurement parameters to make a good measurement ON OFF Turns on off each channel Sensor Type Select Acceleration Vel...

Страница 67: ...it Setup Menu allows the user to change the displayed unit to something different than what was setup in the channel menu For example you may have set the channel menu for velocity to be mm s but woul...

Страница 68: ...p various filters for these measurements Filter Configuration Select 2Hz 1 kHz 5 Hz 1 kHz 10 Hz 1 kHz 10 HzHP 500 Hz HP Bearing 1 kHz HP Bearing MeF New Description of typical uses of the filters Use...

Страница 69: ...by channel Select set filters by channel checkbox and then set each channel Ch1 Ch2 Ch3 Ch4 to the desired filter setting 2Hz 1 kHz 5 Hz 1 kHz 10 Hz 1 kHz 10 HzHP 500 Hz HP Bearing or 1 kHz HP Bearing...

Страница 70: ...in a value larger than zero but you can enter a non integer value ie 0 5 for example Note using this function requires use of the tachometer Interval A pop up window will be displayed to enter the nu...

Страница 71: ...y using velocity These Alarm levels will be displayed when show alarm is selected and Velocity is selected under Unit Select the Group type of machine you wish to measure and the type of foundation th...

Страница 72: ...r chart and trend chart by pressing the soft key on the display Bar Chart Displays the value in a bar chart format Ch1 All Displays all values for channel 1 Acceleration Velocity Displacement Ch2 All...

Страница 73: ...r pressing OK on the navigation button during the measurement or from the previously defined record setup that would automatically record the data points Return Returns to the previous menu Delete Del...

Страница 74: ...calibration values for the calibration signal In the example of acoustic calibration the input value is 1 Pa but your value may be different due to equipment and calibration 10 Press the OK key to con...

Страница 75: ...sensors and select Verify In normal condition the power supply of all channels should be around 24 7 Volts If the result shows abnormal voltage levels please contact Benstone Instruments for assistant...

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