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eZ-Analyst

889691

Edit Menu 4-9

For 9 Channels

Frequency

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Spectral

Lines

25600

12800

6400

3200

1600

800

400

200

100

For 10 Channels

Frequency

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Spectral

Lines

25600

12800

6400

3200

1600

800

400

200

100

Содержание eZ-Analyst

Страница 1: ...1 x IOtech 25971 Cannon Road Cleveland OH 44146 1833 440 439 4091 Fax 440 439 4093 sales iotech com productsupport iotech com www iotech com Real Time Vibration and Acoustic Analysis Software 372165D...

Страница 2: ...sses the following windows Configuration Playback Setup Display Preferences and Output Channel Setup Note that the 640e and 640u analyzers of a relatively extensive section pertaining to output wavefo...

Страница 3: ...1 Window Menu 3 13 Edit Menu see chapter 4 Waterfalls Order Tracking Slice Views see chapter 7 Ch 4 Edit Menu Configuration Window 4 1 Analyzer Tab 4 3 Input Channels Tab 4 15 Analog Input Channels 4...

Страница 4: ...onality 6 6 Copy 6 6 Strip Charts 6 7 XLS Overlay Overlay of Excel Files 6 8 Displaying Channel Pairs 6 10 Changing the Display Range 6 10 Changing Format Scale and Grid 6 12 Ch 7 Waterfalls Order Tra...

Страница 5: ...SVGA 1024 x 768 resolution For WaveBook 516E 10 100BaseT Ethernet port Requires 32 bit version of Windows Windows 2000 SP4 Windows XP or Windows Vista x86 Windows 2000 SP4 and Windows XP Users PC with...

Страница 6: ...rd and Cable WBK21 ISA EPP Interface Plug In Board WBK23 PCI EPP Interface Plug In Board WBK25 Ethernet Interface Module WBK30 WaveBook Memory Options WBK40 and WBK41 Thermocouple and Multi Function I...

Страница 7: ...ws Windows 2000 SP4 Windows XP or Windows Vista x86 Windows 2000 SP4 and Windows XP Users PC with Intel Pentium 4 or equivalent 1 GB memory 10 GB disk space Windows Vista x86 users Software Installati...

Страница 8: ...re automatically installed onto your PC s hard drive as a part of product support at the time of software installation The default location is the Programs group which can be accessed via the Windows...

Страница 9: ...10 GB disk space Windows Vista x86 users PC must be Windows Vista Premium Ready To Install the Software Applies to 640e 640u 650e 650u 652u and 655u 1 Close all running applications on the host PC 2 I...

Страница 10: ...acquisition parameters from user friendly menus eZ Analyst can be used for the dynamic channels of the 655 device but not for the temperature channels If you will be using a 655 for temperature applic...

Страница 11: ...ional analysis time and time again For example a raw signal can be played back over and over using different FFT Window algorithms to manipulate the signal Once the desired results have been achieved...

Страница 12: ...current time is displayed When in Playback Mode the measured time is displayed 4 Slider Bar The sliding bar indicates the relative location of the displayed data The record number and the number of re...

Страница 13: ...ck Mode The Playback Mode does not require the presence of physical hardware When in Playback eZ Analyst is strictly a post acquisition display and analysis program Raw time domain data that has been...

Страница 14: ...st makes use of various menus and related windows for the purpose of configuration Chapter 4 is devoted exclusively to the Edit menu It is that menu which provides access to the Configuration Window s...

Страница 15: ...hannels The Edit Menu is perhaps the most significant of all eZ Analyst menus and is the most frequently used Chapter 4 is dedicated solely to the Edit Menu Task Menu Task Menu Measurement Mode The Me...

Страница 16: ...adlock image indicates that cursors in multiple windows have independent cursor movement i e they are unsynchronized Export This button exports data if export conditions are set For details see the se...

Страница 17: ...hat will be captured during the acquisition Therefore make the Auto Range Duration long enough to apply a typical signal In addition make sure that the Auto Range Analysis Frequency is fast enough to...

Страница 18: ...at the right Minimum FSV is set to 0 2 volts HI Accept defines the highest acceptable percentage of peak input voltage for the selected FSV i e Current Minimum or Maximum Thus if our selected FSV was...

Страница 19: ...eak This value is within our established limits so the Current FSV does not change Note 1 If the Capture Mode is the Input Channel Trigger Mode the Auto Range process waits for a trigger Note 2 A Star...

Страница 20: ...s selected the Active column shows a radio button next to each channel Multiple Channel Used to select two or more channels for simultaneous calibration This is only an option when the calibrator offe...

Страница 21: ...from the popup menu Peak Uses the peak amplitude of the spectrum around the specified frequency of the calibration signal RMS Uses a compensated overall level calculation to determine the RMS level o...

Страница 22: ...set EU Offset is used for DC signal compensation Offset is added to or subtracted from the measured EU value Transducer Gain Transducer Gain is used as auxiliary scaling to compensate for the transduc...

Страница 23: ...e count of greater than 5 is desired 5 Open the Calibration Window from the Task Menu or from the Input Output Channels Tab 6 Select Single Channel 7 Select Auto Range if desired 8 Select a Calibratio...

Страница 24: ...t including channel numbers function type axis type and range These files can be recalled at a later date to process customized plot conditions Without user intervention the plot setup file is automat...

Страница 25: ...for the Ending Block Step 4 follows on page 3 12 The RPC III file format does not represent tach channel RPM data in a meaningful way If you a select RPC III as the export file format and b have a Ta...

Страница 26: ...file name for the function file or use the Browse button to locate the desired file 3 If you want to have records automatically appended to the specified file select Automatic Save after Averaging 4 S...

Страница 27: ...ive features of Plot Display Windows including the Graphic Toolbar buttons refer to chapter 5 The interactive features are not selected from the Window Menu but are accessed via toolbar buttons the mo...

Страница 28: ...ark from Buttons places the channel buttons back onto the toolbar Note that the Input Channel Buttons button located on the toolbar just to the left of where the channel buttons reside provides the sa...

Страница 29: ...ference and response channels and whether Response Increase or Reference Increase is selected Tachometer Tachometer This window displays three fields tachometer channel number measurement and units Ta...

Страница 30: ...d the modal location Note 1 D First Reference Coordinate Shows the channel number and the modal location Note 1 Note 1 A Response or a Reference Coordinate with a yellow background indicates that the...

Страница 31: ...lot Windows Window Menu Tile Vertically When you have multiple plot windows open this menu selection arranges them on your screen as shown The Graph Toolbar discussed in chapter 5 includes a button to...

Страница 32: ...button to allow for quick horizontal tiling Refer to that chapter for button descriptions and locations Example of using Horizontal Tile with two Plots Each plot is longer in the horizontal direction...

Страница 33: ...etup Tab 4 25 Recording Setup Tab 4 33 Block Rejection Tab 4 36 Octave Setup Tab 4 38 Preferences Tab 4 40 Output Channel Setup 4 44 ZonicBook 618E and WaveBook Waveform Output 4 44 640u and 640e Wave...

Страница 34: ...actor S x n we would have a blocksize of 2048 i e 800 x 2 56 Thus w b 2 56 x freq 2048 2 56 2000 0 4 seconds Delta X Freq 1 w 1 0 4 2 5 Hz Acquisition Panel on the Analyzer Tab The values shown pertai...

Страница 35: ...ormance Spectral Lines This section of the Acquisition Panel is used to set the number of spectral lines You can multiply the spectral lines by the nyquist factor to find out the number of data points...

Страница 36: ...crease Larger disk file Slower Slower screen updates Higher lower Delta X Decrease Smaller disk file Faster Faster screen updates Lower higher Delta X Data Block Acquisition Time The time it takes to...

Страница 37: ...k 618E and to the TTL TRIGGER on WaveBook s DB25 connector pin 13 The input accepts a 0 to 5 V TTL compatible signal Latency is 300 ns Channel No Specifies the channel that the trigger condition appli...

Страница 38: ...we have a maximum pre trigger percentage of 47 For 1 Channel Frequency 20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz Spectral Lines 25600 1 5 5 23 23 95 95 99 99 99 99 12800 2 11 11 47...

Страница 39: ...10 43 43 99 99 99 99 12800 1 5 5 21 21 87 87 99 99 99 99 6400 2 10 10 43 43 99 99 99 99 99 99 3200 4 21 21 87 87 99 99 99 99 99 99 1600 9 42 42 99 99 99 99 99 99 99 99 800 19 85 85 99 99 99 99 99 99...

Страница 40: ...z 5kHz 10kHz 20kHz 40kHz Spectral Lines 25600 0 1 1 6 6 24 24 99 99 99 99 12800 0 3 3 12 12 49 49 99 99 99 99 6400 1 6 6 24 24 99 99 99 99 99 99 3200 2 12 12 49 49 99 99 99 99 99 99 1600 5 24 24 99 99...

Страница 41: ...99 99 200 31 99 99 99 99 99 99 99 99 99 99 100 62 99 99 99 99 99 99 99 99 99 99 50 99 99 99 99 99 99 99 99 99 99 99 For 10 Channels Frequency 20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40k...

Страница 42: ...perform the following 1 close the Configuration Window 2 select Measurement Mode from the Task pull down menu 3 open the Configuration window Capturing Transient Data Setting eZ Analyst to trigger on...

Страница 43: ...ration Often it is necessary to capture the events that lead up to the trigger point If this is the situation then positioning should be set for Pre trigger capturing On the other hand if the signal o...

Страница 44: ...her increases or decreases the effect of each new data block on the resultant average Weighting Factor The Weighting Factor either increases or decreases the effect of each new data block on the resul...

Страница 45: ...exporting data How to Perform Negative Averaging 1 Perform an impact measurement with Averaging set to Linear and Triggered Acquisition Take 5 to 10 impacts on a running machine 2 Select Spectrum Disp...

Страница 46: ...4 14 Edit Menu 889691 eZ Analyst Impact Measurement on a Non running Motor Impact Measurement 10 Averages on a Motor Running at 3600 RPM...

Страница 47: ...back mode If you wish to use Measurement mode you will have to reduce the channel count by removing expansion modules To remove the expansion modules you must physically disconnect them from the WaveB...

Страница 48: ...name Highlight a cell before typing a label When you press the Enter key the Apply button or the OK button the label is accepted Ref Resp There are two types of channels Reference and Response All cha...

Страница 49: ...perating compliance refers to the highest voltage that can be applied without change of the current source value In the absence of a transducer the current source will output an open circuit voltage o...

Страница 50: ...Z Analyst startup See Tip TIP If your acquisition system doesn t have or is not making use of TEDS accelerometers then leave the associated checkbox in the Preferences Tab unchecked This will allow fo...

Страница 51: ...the applicable cell Input Type This is the type of instrument attached to the channel Menu selections include Acceleration Velocity Displacement Force Pressure Stress Strain General and Tach Tachomete...

Страница 52: ...oupling is almost always preferred DC Coupling is available to allow viewing of the DC signal but is of no practical use to tachometer related triggers Tach Mode Used to select one of three available...

Страница 53: ...he specified duration In this setup the Delay Value defines the length of time that the trigger criteria must be stable before the tach pulse will be recognized If a keyway is being used as a tach tri...

Страница 54: ...ur application Optimum settings will vary depending upon the noise present on the Tach input 7 Set the Delay Time to a pre set value between 500 ns and 25 5 ms To have no delay time select none The de...

Страница 55: ...eZ Analyst 889691 Edit Menu 4 23 The following diagrams show typical tach pulses and appropriate comparator threshold trigger settings Typical Tach Pulses and Appropriate Threshold Settings...

Страница 56: ...ing edge of one pulse to the falling edge of the next pulse The Period Mode is used for Tachometer inputs which exhibit multiple pulses per revolution The mode provides accurate overall RPM without sa...

Страница 57: ...uces the amplitude magnitude of the data near the ends of each data frame prior to performing the FFT and forces the data to be nearly periodic in the window thus reducing leakage errors Response wind...

Страница 58: ...g reduced weight to the very low amplitude data at the end of the block Decay Decay Percent is used when an Exponential Window is applied to the Response Channel It is the weighting factor present at...

Страница 59: ...ntegration Panel HPF Int1 Int2 The High Pass Filter Integration 1 HPF Int1 and Integration 2 HPF Int2 are used to remove the low frequency effects of integration All data points that exist below the s...

Страница 60: ...e FFT Tab following figure Do not confuse the Tach Setup of Analog Channels CH1 through CH8 with Tach Channels T1 T2 T3 and T4 The later are configured from the Input Channels Tab Reference Note For i...

Страница 61: ...proportional to another value of interest such as in a gear train For example you want to see the RPM for shaft X which is known to turn at 2 5 times the RPM of gear Z but it is impractical for a tach...

Страница 62: ...increased or decreased for next available location numbers Reference Increase If the Reference Increase radio button is selected the response channel s location doesn t change The reference s locatio...

Страница 63: ...numeric field disables Low Frequency Cutoff This means all frequencies will be displayed Edit Menu Configuration FFT Setup Tab dB Voltage Reference Panel dB Voltage Reference is only valid for freque...

Страница 64: ...ng Duration is met whichever occurs first When the Recording Duration value is met the recording event is aborted There is a 2 gigabyte file size limitation that needs to be considered when specifying...

Страница 65: ...ding panel includes a checkbox to enable the scheduled recording function It also includes three text fields see following figure The panel provides a means of setting time conditions for starting and...

Страница 66: ...to automatically increase by a Date Time convention otherwise select Number Number Select the Number radio button if you want the Filenames to automatically increase by a numerical sequence 1 2 3 N c...

Страница 67: ...uble hammer occurs when a signal goes outside of the acceptable range that is set up in the Hammer Rejection section Click in the Double Hammer box to turn the Double Hammer option ON and OFF When the...

Страница 68: ...the amount of which is specified by the delay will be prefixed to the data following the trigger event Also a trigger delay in reference to the Start Trigger Condition indicates that a specified amoun...

Страница 69: ...ange only Dual Band Buffered Measurement Dual Band also referred to as buffered measurement is provided for octave band processing such that spectral lines at settings of 6400 and smaller can cover a...

Страница 70: ...feature then eZ Analyst versions 5 1 45 and higher will continue to load and run those configurations until you re save the configuration in single band mode Edit Menu Configuration Octave Setup Tab...

Страница 71: ...time to the eZ Analyst startup See the following tip Edit Configuration Preferences Tab T E D S Panel T E D S Panel TIP If your acquisition system doesn t have or is not making use of TEDS accelerome...

Страница 72: ...file The checkbox setting determines whether or not you will be prompted to save to disk the current Measurement Mode Setup when the program is either a closed while in Measurement Mode or b the sele...

Страница 73: ...tered or selected a pre existing filename and the Hardware and Configuration Setup file already exists but there is no recorded data present with the same name you will be asked if you want to overwri...

Страница 74: ...sting data unreadable Yes If you choose Yes the file will be overwritten and the shutdown or switching of the mode will proceed No If you choose No you will be returned to the Save Analyzer Setup File...

Страница 75: ...clear of the device Do not confuse the Output Source excitation source with source level as the latter term refers to transducer bias current The Source Output can be used as a test source for the inp...

Страница 76: ...Sine mode refers to a constant amplitude sine wave that is being swept in frequency from a selected start frequency to a selected stop frequency over a selected sweep time duration The frequency sweep...

Страница 77: ...ave runs until it is stopped The preview window displays up to a maximum of 10 seconds of waveform data Also high frequency waveforms will display aliased unless you zoom in to display a smaller segme...

Страница 78: ...the window OK button to accept the change or the X button to cancel the operation Note You can use the Tab key to cycle the selection highlight through all of the controls You can also use the Enter...

Страница 79: ...d Down ramp envelope applied The following figure shows that you can zoom into a specific segment of the waveform to display an unaliased view of the wave To zoom into the waveform simply click and dr...

Страница 80: ...nd Sweep Direction The Waveform Modifier area applies the same types of modifications to swept waves as it does for simple waves In the figure at the right we can see that eZ Analyst is being configur...

Страница 81: ...file you want to import The right hand figure shows the file selection dialog box Raw Data DSC Files If you selected an eZ Analyst raw data file files in the Import dialog box with a DSC file extensi...

Страница 82: ...sion you will be presented with another dialog box This is where you tell eZ Analyst how to interpret the data in the ASCII file The next figure shows the first step needed for importing an ASCII file...

Страница 83: ...d width format you must indicate how many characters wide the channel column is then you select the channel column number to import Text Import Wizard Step 2 of 2 for Fixed Width Format After completi...

Страница 84: ...no information about how the data was acquired Because of this some information about the data has to be manually entered by the operator For example eZ Analyst needs to know what the Full Scale Range...

Страница 85: ...sors may need to have the size of the memory buffer increased to reduce the number of interruptions needed for waveform generation However a larger memory buffer means that changes to the output wavef...

Страница 86: ...window Changes made to the output waveform while the generator is running can not be previewed in the preview window see following figure When the Signal Generator is shut off either by pressing the T...

Страница 87: ...is the minimum number of lines you can have for the given file s playback Overlap Percent 0 99 The percentage of displayed history data that will overlap subsequent data when we step through it The v...

Страница 88: ...r that you want to change 5 When finished click OK in Colors Color Palette window Freq Order Track Slice Applies to Frequency Track Slices and Order Track Slices The measurement mode will always use t...

Страница 89: ...t above the extraneous noise level Peak Width Spectral Lines Sets the eZ Analyst to search data according to a cursor selected range band The band takes into account the Minimum threshold value for pe...

Страница 90: ...led data scaled in either Volts or EUs 5 Auto Spectrum A single channel display function Displays the square of the magnitude of the complex one side Fourier spectrum of x t Autospectra are calibrated...

Страница 91: ...oolbar between buttons 15 and 21 Magnitude Plots only the magnitude of real or complex data Phase Plots only the phase of complex data Magnitude and Phase Plots both Magnitude and Phase data Real Plot...

Страница 92: ...play function At each frequency the coherence is a value between 0 0 and 1 0 which indicates the degree of consistent linear relationship between two signals during the averaging process A value of le...

Страница 93: ...nel You MUST define the response channels to be the correct type of data acceleration velocity or displace ment that you are acquiring Define these in the data type column of the Calibration window Th...

Страница 94: ...information refer to the Strip Charts section in chapter 6 21 XY Axis Grids Used to add or remove vertical and horizontal grid lines 22 Auto Scale XY Axis Lets the application automatically adjust the...

Страница 95: ...r display purpose only and does not modify the data Integration is only active when frequency domain data is displayed Select single or double integration or none by continuous clicks of the button 29...

Страница 96: ...use Order Tracking a tachometer must be assigned to an enabled channel Note that if the Order Tracking and Slice View buttons are both enabled eZ Analyst displays the slice view above the order tracki...

Страница 97: ...2 Slice View 33 Split View 34 Order Tracking or Frequency View ON Grayed Out ON Frequency 3D Waterfall and Frequency Display 31 32 33 34 Displays Selected Waterfall and Frequency Slice 31 3D Waterfall...

Страница 98: ...34 Displays Selected Order Tracking and Order Slice View 31 3D Waterfall View 32 Slice View 33 Split View 34 Order Tracking or Frequency View Grayed Out ON ON Order Tracking Order Tracking and Order S...

Страница 99: ...tle bar is dimmed To change the focus window simply click on title bar of the window of interest Clicking the Graph Toolbar button will bring up a buttons toolbar which provides a means of quickly imp...

Страница 100: ...SideBand Peak and FreeForm Note Another method of choosing a cursor as opposed to using the cursor button is to right click on the plot region and select cursor from the resulting pop up window The to...

Страница 101: ...hannels For example displayed data for channel 2 could erroneously be interpreted as data for channel 1 and visa versa For Order Tracking it is highly recommended that you enter the order value manual...

Страница 102: ...at the cursor applies to simply click on the desired channel s channel box or its plot line Dual Cursors also referred to as Band Cursor Provides two cursors that apply to one channel Note that if the...

Страница 103: ...second at 1200 Hz etc With the use of Annotation values will be shown for all cursors The Main Cursor 5 Harmonic Cursors Peak Used for one channel trace This selection will set up to 20 cursors accor...

Страница 104: ...creen then press Enter You can paste the copied item into other applications For example plotted data can be copied into Notepad Word or Excel for use in reports or in the case of Excel further calcul...

Страница 105: ...ouse cursor over the text Display Mode 3 Select Single Channel of Multi Channel as desired Single Channel When this mode is selected the strip chart will show 4 traces for a single channel The traces...

Страница 106: ...ce numbers are always layered on top of the lower ones See figure The Concept of Trace Overlays To overlay one or more Excel files 1 Right Click on the channel button See following figure 2 Select Ove...

Страница 107: ...g type wrong channel number or would cause you to exceed the limit of 16 displays a message box will inform you of the situation Traces can be moved up or down in ranking order in the Selected XLS fil...

Страница 108: ...ual function displays To change to another reference channel right click on the channel of interest It will now be underlined All channels are response channels even those that have been designated as...

Страница 109: ...ick and drag the mouse cursor vertically on the plot Two horizontal cursor lines will define the new Y axis end points To simultaneously change the X Y Axes Hold down the Ctrl and Alt keys at the same...

Страница 110: ...cale or Grid affects the display only It does not change the real data Format The Format menu allows you to change the axis format of the plotted data Choices are Linear Log and dB valid on for the y...

Страница 111: ...3D Waterfalls 7 2 Order Tracking 7 7 Selecting Displays 7 8 Using Spectrum Cursors 7 11 3D Waterfall Plot TIP To enhance 3D waterfall performance you can do one or more of the following o increase PC...

Страница 112: ...display of spectrum single dual harmonic sideband and free form cursors o Highlighted spectrum of current record in playback mode o Individual control of 3D surface plot and cursor trace transparency...

Страница 113: ...figuration dialog visible you can rotate the waterfall using your mouse Latitude and Longitude values from 0 to 359 degrees track the position of the waterfall Just below the Latitude and Longitude in...

Страница 114: ...The Plot Appearance group provides three options that allow you to choose how you would like the 3D Waterfall surface plot to be drawn You have your choice of viewing the plot as a Color Spectrum Colo...

Страница 115: ...lot also automatically sets Zero based skipping Waterfall Rotation Presets Panel This feature allows you to define up to six custom named waterfall plot rotation settings The names assigned to the rot...

Страница 116: ...and right arrow keys will reposition the cursor There are four ways in which you can use your PC mouse to alter your view of the 3D Waterfall Plot These include two methods of zooming in or out one me...

Страница 117: ...the Measurement Real Time mode or the Playback mode To enable Order Tracking click the associated button see figure after verifying the following o at least one tachometer is assigned to a channel o...

Страница 118: ...ing This button is used to enable the Order Tracking display mode or the Frequency View mode The Order Tracking display mode provides a means of displaying data from points which are evenly spaced by...

Страница 119: ...ice View 33 Split View 34 Order Tracking or Frequency View ON Grayed Out ON Frequency 3D Waterfall and Frequency Display 31 32 33 34 Displays Selected Waterfall and Frequency Slice 31 3D Waterfall Vie...

Страница 120: ...1 32 33 34 Displays Selected Order Tracking and Order Slice View 31 3D Waterfall View 32 Slice View 33 Split View 34 Order Tracking or Frequency View Grayed Out ON ON Order Tracking Order Tracking and...

Страница 121: ...the cursor near the point where the cursor intersects the waveform In the second example following figure the annotation has been placed into the cursor frame Information in the frame appears in a hi...

Страница 122: ...e all of the nodes underneath Clicking the X button will close the Cursor Frame and set cursor annotations to None The cursor frame can be re sized and re positioned as follows To move the frame place...

Страница 123: ...t E to access the Edit Menu press C You will need a mouse to access all panels Also see Ctrl M Opens the Display Preferences Menu After pressing Alt E to access the Edit Menu press D Opens the Playbac...

Страница 124: ...Menu Use arrow keys to highlight your selection then press Enter D S Opens the Scale Type Menu Menu choices are RMS Peak Pk Pk Use arrow keys to highlight your selection then press Enter D T Opens th...

Страница 125: ...holding down both the Ctrl and Alt keys place the cursor at the desired start point on the plot b click the left mouse button c drag the mouse diagonally until the cursor is at the new end point of t...

Страница 126: ...record pointer to the first record comma Move Left 1 Record Moves the record pointer one record to the left period Move Right 1 Record Moves the record pointer one record to the right Zoom in Zooms i...

Страница 127: ...the very similar Hanning window it has a slightly wider main lobe but much better dynamic range This window has the smallest 60 dB bandwidth of any window listed The Blackman Harris window may be pref...

Страница 128: ...ntrast to a varying signal Digital data is represented by combinations of binary digits 0s and 1s Dynamic Stiffness Force Displacement A transfer type that is the reciprocal function of Receptance Dyn...

Страница 129: ...the previous block Free Run is a continuous collection of data with a constant display update Frequency Domain A domain where amplitudes are graphed in relation to frequency Also see Time Domain Freq...

Страница 130: ...condition measured Other transducers e g thermocouples have a nonlinear response To convert nonlinear signals into accurate readings requires software to calibrate several points in the range used and...

Страница 131: ...elocity force and Receptance or Compliance displacement force Reciprocal functions can be derived by taking the inverse of the magnitude and multiplying the phase angle by 1 Apparent Mass force accele...

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