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WINDAQ/Lite/Pro/Pro+ WINDAQ Waveform Browser DI

1. 2 Enable the time marker by Pointing to the Options menu and dragging down to Enable Time Marker Note that you can also enable a time marker by pressing the F4 key or with ALT O M keystrokes 49 File Edit 6250 time marker enabled 2 2 inline with cursor 5 0000 IDATA When enabled a check mark V is displayed on the Options menu immediately preceding the Enable Time Marker command and zeroes fill the time marker display field The check mark indicates that the time marker function is enabled even though it might not be immediately obvious on the screen for various reasons When the time marker function is disabled the check m
2. 39 A AEE O T AANE E ATEA EE 40 Gomimented Note 3 a IRR ORE Dee HE eon e HI dri Hero Ue a da 40 A de ee t e d esee E Saletan bosses 42 IN lE 45 DAVE A e d seb Sock seek EN leo vet bee E e ese ou Ace sce a ec euet ex Wis TE e D Ou td Sek t e ERE 45 Select Live Display dno deine Hd i laa dai 45 Select Marker Display du e ertet ip pte rt P este easton ey este ertet ads Rt eter ree peated 47 OPM LM Md MM M nex Marie Ms cuius a 48 Enable Time Marker 5 Ae eie Ae eae ie oa io oa ous 49 Start THM RARRFKANRRARINANARANBRSNANARANSNAHANBERS NIRE RERBA e RI 50 End Ti 5e O eere tere eed teen edere deter O ede dete exeo eed eden do ed eee dede ees 50 Cursor Time aid 50 PARTE POL DIVISION rita A ia 50 Data Display ied denda dnd dit dci 50 Limit amp Frequency DISpl y iecore RE e iet ER Rt eite p eere e RE rep tein Ln 50 Acquisition ASSI AMENS octanos Fei er eT ch ERO aiii 50 User Annotation coe tec cae re eee eee ete tee tese e tete tete t etras teseede tese tete testes tete ete 50 User Annotation situaba 50 COIDDICSSIOI 36e eee e ee tfe eerte d tele ede ele te c tees 52 IrirNenceodce c c E E 53 Event Markers e tee e stet ee tee Tes toten te esee o esu tes sse los eese aa eo LUE M s LE a 54 NIU MPEET reeds 55 Bxat Enter SS PU rr rettet RE ste teret R
3. Respond by entering any valid DOS file name and any paths that may be necessary Next you will be prompted for an optional comment to be associated with the data written to disk Statistics Comment Statistics Comment Respond by entering a comment or canceling the comment opportunity After entering a comment or canceling the open windows will be cleared and the playback screen will be restored to the state that existed before activating the STATISTICS function Subsequent requests for statistical information allow the option of appending the reported information with comments to the previously defined data file if you activate the Write to File command button Activating the Open New File command button will prompt you for a new file name thus allowing you to send various statistical information to different files if you desire Disk files created by the statistical routine are tabular ASCII files with a comma delimiter and are suitable for importing to any spreadsheet and most other analysis software packages The To Clipboard button sends the text in the Statistics window to the clipboard in text format but with leading signs replacing the spaces in order to line up the digits in the variable pitch system font 70 WiNDAQ Waveform Browser X Y Plotting Allows any two amplitude time Y T oriented waveforms to be plotted versus each other one waveform designated as th
4. 600 96 The X Y plotting screen is composed of three basic sections the Y T waveform area the analysis reporting area and the X Y plot area Each of these components and the purpose they serve will be discussed as follows Y T Waveform Area The Y T waveform area is divided into two display windows window 1 and window 2 Window 1 displays the independent X variable channel and window 2 displays the dependent Y variable channel The waveforms in these windows may be manipulated in the same way and with the same functions ie scrolling scaling offsetting etc that are available in the standard non X Y WINDAQ Waveform Browser display mode In other words the way you review and analyze the waveforms is still the same regardless of the fact that the waveforms are displayed in a smaller window space Three cursors appear in the Y T waveform area to show the portion of the waveform used to generate the X Y plot They are the left X Y limit cursor the right X Y limit cursor and the data cursor WINDAQ SAMPLE WDQ File Edit View Search Scaling Transform XY Options Help vor SEN Ne Je Window 1 X bo yg ee A Window 2 Y Left X Y Right X Y limit cursor Data cursor limit cursor The portion of the Y T waveforms to be plotted versus each other is all waveform information lying between the left and right limit cursors shown above as the sha
5. The split function can be canceled by pressing the 55 ESC key EXIT ENTER SPLIT Function This command allows you to toggle between the regular and split screen displays This feature can be used after a Fourier Transform operation to examine a magnified display of the inverse transform in waveform strip 2 When the split screen view is exited the spectrum data displayed there is retained allowing quick access for subsequent looks at the split screen display To exit from or return to the split screen display proceed as follows Point to the View menu and drag down to Exit Enter Split MORE BOTTOM Y Function This command increases the height of the bottom pane allows you to see more of the Y axis by 1 16th of the total plot height To increase the height of the bottom pane by a fixed amount proceed as follows Point to the View menu and drag down to More Bottom Y LESS BOTTOM Y Function This command decreases the height of the bottom pane allows you to see less of the Y axis by 1 16th of the total plot height If the bottom pane is completely closed with this command the spectrum data retained in memory including the inverse transform will be lost To decrease the height of the bottom pane by a fixed amount proceed as follows Point to the View menu and drag down to Less Bottom Y LEFT LIMIT Function This command selects the left limit cursor in the Y T waveform area or upper pane allowing yo
6. When attempting to seek an event marker in either direction where one does not exist an audible beep will sound the display will fail to move and an error message will be displayed Click on the OK box or press the ENTER key to clear the error message 37 WiNDAQ Waveform Browser Extract Channels Using Save As Allows you to copy a range of waveform information from selected channels in an existing data file and export them to a new file in a variety of different storage formats This function exports only certain channels only the channels that are visible onscreen in the data file lying between the specified range If you wish to export all of the channels in the data file refer to the EXPORT Using Save As function The newly created file may contain any subset of channels from the existing data file Before data may be exported to a disk file the copy range must be selected The copy range is defined as all data for each channel lying between the time marker and cursor To select the copy range 1 Position the cursor at one end of the desired range drag the left mouse button in the bottom annotation margin to position the cursor WINDAG MARKI WDG File Edit View Search Scaling Transform XY Options Help 76250 1 1 Tr f a Pap P TRETEN Vt M Mp GA 1 A AA Mord MR cursor 4 ositioned at ENIM eginning of desired range b Q4 de position cursor by 1 Z
7. l4547 v iii DATA 13 0860 SEC TBF Samples from Marker Annotates the number of samples or individual data points in the section of waveform bounded by the cursor and time marker To display the number of data samples in the marker display field 1 Point to the Options menu and drag down to Select Marker Display 2 Click on Samples from Marker When selected the marker display field will show XXXXX SMP TM where XXXXX is the number of 47 samples in the section of waveform bounded by the cursor and time marker Cursor 02891 42i Number of samples format enabled 50 SMP TM 14547 i i i DATA 19 0640 SEC TEF Note that the time marker must be enabled for display with this format If the cursor is positioned directly on top of the time marker the live display field shows zero no samples It is possible to see a negative samples value in the marker display field for this format This occurs when the cursor is moved to a point on the waveform left of the time marker Hz for Cycle to Marker Displays a frequency in Hz for the section of waveform or cycle defined by the cursor and time marker To display the frequency in Hz of the selected cycle in the marker display field 1 Point to the Options menu and drag down to Select Marker Display 2 Click on Hz for Cycle to Marker When selected the marker display fiel
8. For optimum scrolling speed ensure that the WINDAQ Waveform Browser window is positioned entirely on the screen If a portion of the currently active window is hidden offscreen scrolling speed is dramatically reduced For best scrolling speed results position or resize the active window so it is contained entirely onscreen Click this area to scroll one screen width at a time Drag slider box to scroll long distances Click scroll arrows to scroll 16 pixels at a time D e Clicking the left or right scroll arrow scrolls the waveform 16 pixels at a time Clicking and holding either scroll arrow repeats the scrolling action until the beginning or end of the file is reached To scroll by less than 16 pixels you must use the cursor in conjunction with the mouse Click in the bottom annotation line and drag the data cursor to the desired point in either direction Clicking anywhere in the horizontal scroll bar on either side of the slider box scrolls the waveform one screen width toward the beginning or end of the data file The left mouse button can be held down to scroll rapidly until the slider box reaches the mouse pointer The keyboard s number lock NUM LOCK function must not be enabled when waveform scrolling is activated Using a floppy disk based data file as opposed to a hard disk based file will adversely affect the maximum speed of waveform travel in either direction To achieve maximum wa
9. 40 3743 40 4200 40 4657 40 5114 40 5571 40 6029 40 6486 FIGURE 1 A sample of the hard copy output shows the file waveform and time information provided See text for a complete description of each function MUNDI Waveform Browser Refresh Updates the scroll bar position and EOF field to reflect the new length of a file being acquired Point to the View menu and drag down to Refresh 45 WINDAQ Waveform Browser Save Saves a copy of the file you are working with on disk All header information is saved in the current data file resulting in the same display when the file is reviewed again Note that this function does not cause you to exit the file or prompt you for format or save options it merely saves the current state of your data file D Point to the File menu and drag down to Save Use the Save function when you want to update a file on disk with the most recent changes If you want to save a copy of a file without affecting the version of the file already on disk use the Save As function Wi nDaa Waveform Browser Select Live Display Allows you to select between four different data formats for display in the live display field These formats report waveform information for the currently selected channel as time from beginning of file difference from time marker point change from time marker point and slope of line to time marker point Time From Beginning of File
10. 7 2948403 TKSIOEE 7 2948403 THELOPE off XEUF Where the value to the left of TNSLOPE is equal to the instantaneous rate of change between the points to the left and right of the point chosen cross hair origin in units of channel Y s units divided by channel X s units For example if channel X s Y T waveform is calibrated in units of PSI and channel Y s in units of Liters the rate of change is expressed in units of Liters PSI Calculating 2 point and Linear Regression Rate of Change Unlike the instantaneous rate of change which calculates the rate of change at one point on a plot the 2 point rate of change allows the slope of a line connecting two defined points on the X Y plot to be determined Linear regression rate of change reports the slope of a best fit line between the two defined points Both 2 point and linear regression rates of change are reported simultaneously in the analysis reporting area The two points over which the rates of change will be calculated are defined by moving the data cursor between the left and right limit cursors on the Y T waveforms and enabling a time marker on window l s X channel waveform This defines the first point The second point is defined by moving the data cursor to another point on the Y T plot the cross hair moves automatically on the X Y plot Note that cursor movement must be done with both Scroll Lock and Caps Lock off Following your selection of the two points th
11. Help 26 High Calibration 15 High pass Filter 69 Hz for cycle to marker 49 p Insert Commented Mark 24 Insert Mark 24 39 Inverse Transform 70 Invert 26 EX RE Left Limit 57 Less Bottom Y 57 Limit amp Frequency Display 52 Limit Display 20 Limits 15 Low Calibration 14 Low pass Filter 70 M Mag Engr Units 68 More Bottom Y 57 N Next Mark 39 Next Palette 27 Note 43 0 Open Reference File 19 Open 50 Oscilloscope Mode 17 18 Output FRQ Data 68 p Pause Graphics 18 Peak on Screen 37 Percent Change from Time Marker Point 48 point 2 Previous Mark 39 Previous Palette 27 Print 44 45 RES Record 2 16 18 RECORD 28 RECORD operating mode 2 Refresh 47 Remote Events 25 Remote Events 25 Remote Storage 0 25 Remote Storage 1 25 Right Limit 57 S Sample Rate 11 samples from marker 49 Save 35 47 Save As 34 40 Save Default Setup 23 Scale DB 67 Scroll Mode 17 18 Select Live Display 47 48 Select Marker Display 49 sequential ASCII 35 SET UP operating mode 2 SET UP 2 13 19 28 Show Dynamic Range 29 Shrink 2X 31 Slope of Line to Time Marker Point 48 79 Slopes 74 Split 56 Spreadsheet Print 36 STANDBY operating mode 2 Start Time 51 Statistics 71 STBY 2 23 28 Stop 2 16 T Time from Beginning of File 47 Time from Marker 49 ti
12. Scroll Channels 0 1 Io s F3 400 Compress F7 1 Storage 4 5 used 6250 Pol H H icf go d H EG H 5 0000 NH P Es CHEN 200 sec DIV 0 Status RECORD A Actively recording to disk To stop acquisition to disk Point to the File menu and drag down to Stop This suspends data storage to disk but the real time display remains active The status field in the bottom annotation line indicates STBY when acquisition has been stopped The Stop function on the File menu only becomes selectable when in the record to disk mode SecIDIWi Ori Peer recording has been stopped 7 As data is being recorded to disk the amount of file space consumed is displayed in the Storage field of the status bar as a percentage of total file space consumed DI 170 Acquisition MARK WDQ File Edit View Scaling Options Help Mode Scroll Channels 0 1 Compress F7 1 gtorage 5 5 used s s F3 400 6250 i E COAT File space consumed Data acquisition to disk may be started and stopped as many times as desired When the target data file has been filled data acquisition to disk will cease the Storage field of the status bar will display 100 used and the Status field of the status bar will display FILE FULL DH 170 Acquisition MARK WD File Edit View Scaling Options Help Mode Scroll Channels 0 1 Compress F7 1 Storage 100 0 used Data file full indica
13. amp User Palette Allows the selection of one of 16 pre defined display palettes Additionally a user palette option allows you to redefine the color scheme of the displays by selecting different background gridline user annotation and waveform colors from among 16 choices A different palette can be displayed by selecting either the Next Palette or the Previous Palette command from the View menu These commands allow you to pan through and display all 16 palette selections in either a forward or backward direction Display the Next Palette Point to the View menu and drag down to Next Palette Display the Previous Palette Point to the View menu and drag down to Previous Palette Note that you are not limited to the color combinations presented on the 16 pre defined display palettes It is possible to tailor one several or all palettes to suit your color preference taste or room lighting requirements The tool used to accomplish this is the User Palette command The User Palette command allows you to redefine the palettes color scheme by selecting different background gridlines and user annotation or waveform colors from among 16 color choices When a palette is changed you have the option of making the new color scheme permanent or canceling all color changes If the changes are canceled the palette reverts back to the original color scheme you started with If the changes are made permanent the new colo
14. computer is currently active and to discourage you from activating the transform again thereby queuing up more time consuming requests and tying up the machine for several minutes Another reason for providing the indicator is to indicate where the computer is spending its time through the course of a transform calculation Using the following table as a guide the Time minimizing Element column defines what can be employed to minimize the time required to make the calculation Time minimizing Letter Element Action A Computer type and speed Compute squared magnitudes averaging by frequency smoothing factors C Computer type and speed Change variable point sine consine table when number of points changes for DET of other than a power of 2 points D Hard disk with fast access time Gather input data from disk or compute output from IFT F Computer type and speed Perform basic FFT algorithm or its inverse L Coprocessor Compute exponential look up table for use in logarithmic plotting M Computer type and speed Multiply input data by window or multiply transforms during indirect DFT of a number of points which is not a power of 2 Form sine cosine table for basic FFT This is done each time an FFT is needed that is two or more times larger than the previous largest s Computer type and speed WwW Computer type and speed Compute Bartlett hanning Hamming and Blackman windows Done each time
15. erm e erial men gjparae 5 Diao INSTRUMENTS ia DI 151RS Dig 1 Wavetorm Recording System Ghd Active Ch2 E Ch 1 Channel 1 signal input Gnd Channel 1 signal ground Therm 1 Thermistor lead 1 input Therm 2 Thermistor lead 2 input Dig 0 Digital input 0 Dig 1 Digital input 1 Gnd Channel 2 signal ground Ch 2 Channel 2 signal input Your DI 151RS comes with the on board waveform generator configured to provide a sample input signal The onboard waveform generator is enabled by connecting a jumper wire between the Ch 1 and Dig 1 inputs A thermistor is also included for temperature measurements So it doesn t get lost during shipping one leg of the thermistor is connected to a screw terminal Unless you would like to make temperature measurements with the thermistor remove it completely from the DI 151RS Do not make voltage measurements with the thermistor installed Any voltage measurement made with the thermistor installed will be inaccurate When using the termistor to make temperature measurements insert one thermistor leg into input Therm 1 and the other thermistor leg into Therm 2 In order to get accurate temperature measurements the thermistor must be calibrated The procedure for doing this is included in step 8 When the DI 151RS is configured for voltage measurements Ch 1 and its Gnd make up one single ended analog input channel while Ch 2 and its Gnd make up the other DI 195B Al
16. key 3 Set the compression factor of the original file equal to the SCREEN COMPRESSION value shown in the header 4 Reproduce the spectrum by pressing CTRL W A DFT spectrum may be reproduced as follows 1 In the original file set the waveform compression factor to 1 2 Move the cursor until TBF in the bottom annotation line is equal to the TBF OF RIGHT POINT value shown in the header 3 With the cursor at this position press F4 to set a time marker 4 Now set the waveform compression factor equal to the INPUT AVERAGING value shown in the header 5 Now move the cursor so that TBF in the bottom annotation line is equal to the TBF OF CENTER POINT value shown in the header 6 Reproduce the spectrum by pressing CTRL F INVERSE FOURIER TRANSFORMATION FT EDITING THE POWER SPECTRUM In many cases it is desirable to examine a waveform without any noise present to distort the true nature of the signal This can be done by applying high pass low pass band pass and notch filter functions to the power spectrum to eliminate the noisy frequency components WINDAQ Waveform Browser software provides high pass filter low pass filter band pass filter and notch filter functions to eliminate these unwanted frequencies from the plot The high pass filter removes all frequency components to the left of the position of the cross hair origin The low pass filter removes all frequency components to the right of the
17. names to which WiNDAQ Waveform Browser software is to write the copied data When a file name is entered export the specified range by Clicking the Save command button The data within your selected range and from every channel in the file will be copied to the specified data file Note the Visible channels only check box at the top of the Save As dialog box This option must remain unselected no X appears in the check box for the export function to work on all channels in the data file If this option is selected an X appears in the check box only the visible channels those that are displayed on your monitor in the data file will be exported Refer to the EXTRACT CHANNELS function in this chapter for complete details on the Visible channels only check box A description of each data storage format follows SEQUENTIAL ASCII This data storage format is one of three Binary without CODAS header and Lotus 1 2 3 are the others that may be used to create a data file readable from a user generated applications program e g BASIC FORTRAN C etc Data is stored as ASCII strings with a comma delimiter Each data value field consists of eleven characters excluding the comma The data format is scientific notation and is scaled into engineering units as follows SX XXXXESXX Where S is the sign of either the exponent or mantissa E flags the value of the exponent The order of data storage is sequenti
18. point found To use the Go to Range feature 1 Select the window that contains the desired waveform Click the left mouse button in the unselected window s annotation margin File Edit View File Edit View File Edit View Mode Oscill Mode Oscill Mode Oscill B s F3 200 S s F3 200 S s F3 200 10 000 001 1U UUU 001 10 000 00i 1 0 Volt L 0 N Volt Volt 10 000 nnn 10 000 unselected RU selected window ANYWNETS window to select 2 Specify the range as follows Point to the Search menu and drag down to Go to Range This displays the Search for data range dialog box The Go to Range function is controlled from this dialog box as follows Search for data range Volt to upper limit lt lt Inside Range Inside Range gt gt lt lt Outside Range Outside Range gt gt from lower limit This text box allows you to enter a value representing the lower end of the 39 range If this text box is left blank the low end of the range is unbounded This limit is retained until a search is done on a different channel or a new file is opened When limits are assigned the lt lt Inside Range lt lt Outside Range Inside Range gt gt or Outside Range gt gt command buttons can be used to move the cursor to the next or previous data point inside or outside of the specified range to upper limit This text box allows you to enter a value
19. setting DI 170 Acquisition File Edit View Scaling Options Help Mode Scroll ers 200 Compress F7 Storage This function is simply a graphics adjuster that only affects how the display looks on your screen Data acquisition is independent of this function and is always recorded gap free at a compression factor of 1 no compression applied When compression is applied to the waveform multiple A D readings equal to the compression factor are evaluated for plotting In this instance less CPU time is required for the display For example if compression equals 100 then 100 consecutive A D readings are evaluated to define a waveform point When compression is selected a true min max is performed on the waveform to ensure that transient information is always displayed The degree of waveform compression is controlled as follows Point to the Edit menu and drag down to Compression This displays the Compression dialog box as follows Desired Compression Cancel To specify a degree of waveform compression Enter the desired compression factor from 1 to 65 536 and click OK A fast and convenient way to experiment with many different compression factors is with the Compression x2 and Compression 2 commands These commands respectively multiply or divide the current compression factor by 2 To multiply the current compression factor by 2 20 D Point to the Edit menu and drag d
20. 2 representing the edited power spectrum currently plotted in the FFT plot area This new waveform will be scaled like the original as well as having the current compression factor but will appear multiplied by the data window if an FFT was applied From this point the IFT waveform may be further examined or exported by using the analysis functions provided by WiNDAQ Waveform Browser software from within the FFT mode or after exiting the FFT mode by pressing CTRL Y Note that when an IFT is generated the previous IFT if any is not saved and therefore cannot be pasted together to form a large waveform made up of several sections of different IFT s The waveform originally occupying window 2 is deactivated not removed from the waveform file Window annotation 220 at the bottom of the screen is automatically enabled by the software when it displays the IFT waveform The original waveform may be restored by typing 2 x where x is the channel number of the originally displayed waveform TRANSFORM CONSIDERATIONS Since some large transforms take a long time on CALCULATION TIME computers without a numeric coprocessor a status indicator in the form of a letter A C D F L M S or W is displayed in the analysis reporting area to indicate the FFT operation currently in progress 7 Status indicator appears here MIDI 15 14 Hz 78 8 538E 02 MAG hn 74 2 EOF This feature is provided to indicate that the
21. 5 This means that for every 5 data points on the original waveform one average value was used as the input to the DFT algorithm The value in column D is the number of data points contained in the transform which is derived by multiplying the number of pixels between the left and right limit cursors by the value from column B The limit cursor approach has the advantage of displaying all waveform information to be transformed on the screen at once By adjusting the waveform compression factor virtually any range of waveform information may be displayed on the screen isolated by adjusting the limit cursors then transformed However if a compression factor is enabled to bring the desired range on screen this approach suffers from the disadvantage that each point on a waveform represents multiple acquired 63 points For example each displayed point on the waveform represents a combination of 15 acquired points if a compression factor of 15 is enabled making precise end point placement difficult For this reason a second DFT placement approach is available This approach defines end points through use of the time marker and cursor Defining the DFT Range Using the Time Marker and Cursor The time marker approach to specifying a DFT range allows precise placement of end point markers Unlike the previous method of power spectrum generation the time marker approach does not require the onscreen display of the full range of wavefo
22. 72 9 Frequency Scale EXITING THE FFT MODE To exit the split screen mode and return to the Y T mode of operation Point to the View menu and drag down to Exit Enter Split Exiting the split screen display in this way retains the power spectrum data in memory so the two modes can be quickly toggled between if desired Alternatively you may terminate WINDAQ Waveform Browser from the split screen mode by Pointing to the File menu and dragging down to Exit If you exit from the split screen mode with the option of saving the WiNDAQ Waveform Browser state the state that existed at the time the program was terminated becomes the default condition the next time the file is reviewed Elements of the saved state are marker positions whether an FFT or DFT was activated the input average factor magnitude in engineering units or db the window type Hamming Blackman etc and the frequency axis magnification factor Note that a significant relationship exists between the location of markers and the resulting power spectrum To ensure that the current screen display is reproduced when quitting with the save state option no marker adjustments should be made following the generation of the last FFT DISCRETE FOURIER TRANSFORM DFT DFT GENERAL INFORMATION When it is necessary to select a portion of the waveform more accurately than an FFT will allow or when a non windowed transform is de
23. DFT Waveform compression operates slightly differently when the time marker approach is used as compared to the other method When the time marker is used the compression factor defines the number of consecutive Y T points averaged before transforming the waveform For example if 2244 points exist between the cursor and time marker then the result is a 2244 point transform if the compression factor equals 1 Leaving the markers position unchanged and incrementing the compression factor to 2 would yield a 1122 point transform since one point representing the average of each two consecutive points is passed through the transform Whenever a DFT is activated using the time marker method the analysis reporting area will display the actual averaging factor as follows DATA 28 5 Hz X1 52 24 DB C1 30 1 EOF DFT with an averaging factor of 1 MID 23 8 Hz X1 52 50 DB C3 30 6 EOF I DFT with an averaging factor of 3 POWER SPECTRUM MEASUREMENTS CROSS HAIR ADJUSTMENT The cross hair may be scrolled along the plot to examine other points of interest As the cross hair is scrolled along the plot the frequency and magnitude at the cross hair origin are displayed in the analysis reporting area The cross hair can be scrolled by Dragging with the left mouse button anywhere in the FFT plot area Note that the display of the cross hair may be toggled off and on by pressing ALT F2 POWER SPECTRUM WINDOWIN
24. Options Help Mode Oscill Channels 0 1 2 3 S a F3 800 Compress F Storage amp used 6250 1 E iow H 1 0024 Volt 6250 2339 0073 Volt sec DIV 0 1 Status SET UP sample rate per channel Although thousands of different sample rates may be configured some discrete rates are not achievable This limitation is due to the inability to divide the master clock in a manner that results in an even numbered quotient For example say you enter a sample rate of 200 What you might actually get because of the previously stated limitation is 200 3 EM pecifying Gain and Measurement Range NOTE DI 151RS DI 195B and DI 401 Users DI 151RS DI 195B and DI 401 users can ignore this step and proceed with step 8 DI 151RS instruments have a fixed gain of unity and a fixed measurement range of 10 volts DI 195B and DI 401 instruments have a fixed gain of 1 unity and a fixed measurement range of 5 volts Choosing the proper gain factor for your input signals allows you to get the best possible measurement resolution out of your instrument The default WINDAQ Lite gain setting is 1 unity A gain of 1 provides the widest possible measurement range For example say you re using a DI 400 PGH This instrument features a maximum analog measurement range of 10 volts and programmable gain factors of 1 2 4 and 8 At a gain of 1 gain factor 1 the full scale measurement rang
25. X 862Er02 DELTA Y off EOF X Y excursions DATA 7 294E 03 TNSLOPE 7 294E 03 TNSLOPE off EOF Instantaneous rate of change DATA off SEC TBF 3 74487 SEC TM DATA 5 56581E 02 LRSLOPE 9 946E 04 2PSLOPE off XEOF 2 point rate of change DATA 9 966E 00 NEWAREA 9 966E 00 TOTAREA off EOF Area bounded by curve DATA 5 599E 01 NEWAREA 1 DU1E U1 ADJAREA off EOF Adjusted area bounded by curve Calculating X Y Excursions For any displayed X Y plot the total excursion in the X and Y directions may be reported To report the total X and Y direction excursions Point to the XY menu and drag down to Deltas This causes the analysis reporting area to display the following data DATA 3 0988 02 DELTA X 4 862E 02 DELIA Y off BOF Where the value to the left of DELTA X is the total X direction peak to peak excursion in channel X s unit of measure and the value to the left of DELTA Y is the total Y direction peak to peak excursion in channel Y s unit of measure Calculating Instantaneous Rate of Change An instantaneous rate of change for any point on an X Y plot may be calculated This is done by positioning the cross hair at the point of interest on the X Y plot then Pointing to the XY menu and dragging down to Slopes When the instantaneous rate of change function is activated the analysis reporting area will display DATE
26. accessing the application Terminating Windaq before your application will cause your host program to become unstable This anomale is not an issue after your program is compiled into an EXE T Y EOF 38 A A Acquisition Assignments 53 Adjust Area 75 Area 75 Assign Channel 30 65 ASYST 35 ASYSTANT 35 Average Power 66 B Beep on File Full 23 binary with CODAS header 35 binary without CODAS header 35 C CALC 36 calibrate 14 Center Cursor 37 Channel Settings 12 Channels 10 Clear Areas 75 Clear Marks to TM 39 click 2 Close 23 Commented Note 43 Compress FRQ 67 Compression 2 22 Compression x2 22 Compression 22 54 65 Copy 26 Current Data 19 Cursor Time 52 cycles per minute for cycle to marker 49 p DADISP 36 Data Cursor 37 38 55 Data Display 20 52 Delete Mark 39 Deltas 74 DFT 63 65 Difference from Time Marker Point 47 Double click 2 Drag 2 E Enable Live Display 38 Enable Time Marker 34 50 End Time 51 erase bar check box 19 Erase Frequency 70 Event Markers 55 78 Event Marks 38 Exit 26 28 Exit Enter Split 57 62 65 Exit Enter XY 72 Exit 62 F Format Screen 11 free run 18 free run check box 19 Go to Range 41 Go to Time 42 Go to TM Position 41 graphic selection rectangle 26 45 Grids 29 Grow 2X 31 H
27. an FFT is performed that is two or more times larger than the previous FFT L time which is proportional to the height of the frequency part of the split screen can be dramatically shortened by a numeric coprocessor C time is roughly proportional to the number of transform points and will show up each time the number of points changes for FFTs D time is proportional to the total number of transform points and the number of data points to be averaged per transform point For forward transforms it is also proportional to the number of channels in the file and the time required for disk operations 69 F M C W S and A times are roughly proportional to the number of transform points and machine instruction times S and W will have to be recalculated after memory deallocation occurs to spawn another program to perform a maximum compression or to enter the X Y mode But memory is retained after an Exit Enter Split from the FFT mode to allow reentering with another Exit Enter Split without a time penalty Wi nDaa Waveform Browser Statistics Allows you to derive statistical information from specified segments of the enabled waveform channel The statistics function is available only from the Y T display mode of WINDAQ Waveform Browser software It is not available from the X Y or FFT display modes Statistical information about a waveform is obtained by first enabling the window containing the waveform of intere
28. analyze measure quantify etc the data that was just recorded If you are in the record mode when Browse is selected WINDAQ Waveform Browser will automatically open the very same file you are actively recording to If you are not in the record mode when Browse is selected WINDAQ Waveform Browser will prompt you for the file you wish to review To enable this multitasking feature e Point to the File menu and drag down to Browse This starts the WINDAQ Waveform Browser Since waveform data is constantly being written to this WINDAQ Waveform Browser file while WINDAQ Lite is actively recording you must request updates to see all of the latest data This is done in WINDAQ Waveform Browser by 15 periodically pointing to the View menu and selecting Refresh WINDAQ Lite Scroll Mode Oscilloscope Mode 8 Pause Graphics Waveform information can be displayed on your monitor in either a continuous smooth scroll mode or in a triggered sweep oscilloscope mode scroll display mode indication DI 170 Acquisition caling Options Help File dit View Channels 0 1 Compress F7 1 Storage used 6250 oscilloscope display mode indication DI 170 Acquisition Either display mode may be enabled at any time during data acquisition without affecting the information being stored to disk Display mode changes only affect the way waveforms are displayed on your monitor 1 Select a disp
29. and cancels any changes made to trigger conditions provided the changes were not saved with the OK command button WINDAQ Lite Open Reference File Allows you to use an existing data file as a set up for a new data file All recording parameters such as number of channels scaling constants engineering units display format compression display mode gain etc are ported from the existing file to become the default conditions for the new data file This function allows instantaneous setup thus making it easy to run similar but separate waveform recording sessions To use an existing file s recording parameters for a new file Point to the File menu and drag down to Open Reference File You will be prompted for the name of the existing data file This file must be one created by WiNDAQ software and must already exist When a filename is entered and the dialog box is closed the new file immediately inherits the existing file s recording parameters This function is enabled only when in the SET UP operating mode Status field in bottom annotation line indicates SET UP WINDAQ Lite Current Data Data Display Limit Display 8 User Annotation Allows you to enable or disable on screen annotation options Each annotation option is described as follows 17 Current Data Enables disables the display of the current waveform data value in the left or right annotation margin The Data Display option must
30. as follows Point to the Search menu and drag down to Go to Time This displays the Go to date and time dialog box The Go to Time function is controlled from this dialog box as follows 40 Date 09 15 92 Previous Date Selects the previous date which is then displayed in the middle of the dialog box above this command button Previous Date Time Next Date Selects the next date which is then displayed in the middle of the dialog box above this command Time Allows you to enter a time value The time must be entered in 24 hour format from 0 00 to 23 59 59 If omitted the seconds value defaults to 00 OK Moves the data cursor to the position in the file that corresponds to the specified date and time If it is not possible to move to the specified time because it falls before the first data point or after the last data point in the file an appropriate error message is displayed and the cursor is placed at the next point after the beginning of the file or at the end of the file Cancel This command button removes the dialog box without moving the data cursor anywhere Using the Go to Range function on a compressed waveform compression value greater than 1 will often result in the displayed data disagreeing with the search range This is because the Go to Range function looks at individual data values and a compressed waveform is many individual data values compressed to form one line
31. but what if you wanted to examine a selected portion of the plot more closely This can be done by scaling the frequency axis A VGA monitor provides 640 picture elements pixels of horizontal resolution If a 512 point FFT is performed the 256 points generated by the transform fit nicely on a screen capable of displaying 640 points The same is true of a 1024 point FFT where 640 pixels is more than adequate to contain the 512 points generated by the transform The problem arises when a transform larger than 1024 points is performed Suppose an 8192 point FFT is performed The 4096 points generated by the transform is much wider than the 640 pixel width of the screen In order to get the entire power spectrum on one screen compression in this case a factor of 7 is automatically applied To zoom in on the power spectrum and examine it in greater detail you must magnify the spectrum or in effect scale the frequency axis After the power spectrum is plotted scaling of the frequency axis may be used to examine a selected portion of the plot more closely To do this scroll the cross hair along the spectrum until it reaches the desired section of the plot and Point to the Transform menu and drag down to Compress FRQ This displays the Frequency Compression dialog box as follows Frequency Compression Compression Zoom Factor 1 D Cancel From this dialog box you activate the Expand command but
32. can now be generated directly from either the Y T or the X Y display modes as follows Point to the Transform menu and drag down to Windowed FFT This displays the FFT Window Type Size and Averaging dialog box as follows FFT YYindow Type Size and Averaging Data Window Type Bartlett hanning Number of Points Input Averaging From this dialog box you are able to select the type of FFT window that will be applied the size of the FFT and the input averaging factor The FFT algorithm supports four different types of windows that may be applied to minimize the effects of end point distortion These are Bartlett hanning Hamming and Blackman windows The characteristics of each window are described by the following figure AAN baseline Bartlett Ba hanning hn Hamming Hm Blackman BI Each window has different characteristics that make one window better than another at separating spectral components near each other in frequency or at isolating one spectral component that is much smaller than another or whatever the task The window that you use depends on your skill at manipulating the tradeoffs between the various windows and also on what you want to get out of the power spectrum or its inverse for complete information on the Fourier transform algorithm request Dataq Instruments free Application Note number AN 11 Waveform Analysis Using the Fourier Transform
33. chosen the following dialog box is displayed You are required to select one of the options prior to exiting Exiting DIZ00AC Do you want to exit OK Command Button Exits to the Program Manager window without saving anything i e calibration or set up parameters If calibration or set up parameters were previously provided and saved by using the SAVE DEFAULT SETUP command they will be unaffected by this command Cancel command button Returns to acquisition cancels your exit request When in either the RECORD or STBY operating mode and an exit is requested the prompt in the exit dialog box indicates that the data file will first be closed if the OK button is selected Exiting DIZ00AC Do you want to close file and exit Cancel In this case the command buttons function exactly the same as described above However the calibration or set up parameters can be saved by first selecting the Cancel button followed by SAVE DEFAULT SETUP from the File menu then selecting the OK button Exiting From the WINDAQ Waveform Browser When the Exit command is chosen the following dialog box is displayed You are required to select one of the following options prior to exiting m Saving changes to current file header Do you want to Save All Save Calibration Exit with No Save Cancel Save All command button Saves the entire state of playback data including
34. cross hair origin The notch filter removes the frequency or frequencies if the frequency axis is compressed at the cross hair origin The band pass filter is a combination of high pass and low pass filters applied to isolate a narrow band of interest on the spectrum The power spectrum can be edited as follows To apply a high pass filter remove unwanted frequency components to the left of cross hair origin position the cross hair origin at the desired point on the spectrum and Point to the Transform menu and drag down to High pass Filter To apply a low pass filter remove unwanted frequency components to the right of cross hair 68 origin position the cross hair origin at the desired point on the spectrum and Point to the Transform menu and drag down to Low pass Filter To apply a notch filter removes the frequency or frequencies if compressed at the cross hair origin position the cross hair origin at the desired point on the spectrum and Point to the Transform menu and drag down to Erase Frequency The band pass filter is simply a combination of High pass and Low pass filters applied to isolate a band of interest See the individual procedures as described above for details on applying each INVERSE FFT GENERATION After editing the power spectrum it is possible to perform an IFT by Pointing to the Transform menu and dragging down to Inverse Transform This generates a waveform in Y T window
35. display conflicts For example with other color schemes the cursor may seem to disappear when positioned coincident with a dark vertical gridline The same result can happen with a waveform that rides the window baseline the signal seems to disappear but it is merely the same shade as the baseline Selecting the monochrome color scheme ensures that your monitor will show every shade it is capable of showing without any conflicts Color Selection Conflicts When selecting color combinations it is important to note that the cursor color not modifiable will always be the inverse of the background For example if the background color is black the cursor color will be white or if the background color is red the cursor color will be dark cyan For this reason do not pick the inverse color of the background for grid lines and user annotation If you do the cursor will seem to disappear when coincident with vertical grid lines As a general rule do not assign the inverse color of the background to any other parameter grid lines and user annotation 1st waveform or 2nd waveform and do not make both waveforms the same color WinDaQ Lite EC WWB m Exit Quits the WINDAQ Lite waveform recording or WiNDAQ Waveform Browser playback and analysis program To quit either recording or playback Point to the File menu and drag down to Exit Exiting From WINDAQ Lite When in the SET UP operating mode and the Exit command is
36. frame of data if you use the data frame methods or it can monitor the whole data stream if you use the data stream methods The primary advantage of this control is to relieve you of the tasks associated with initializing data acquisition These include but are not limited to scan list initialization and management sample rate definitions engineering unit scaling and many others These tasks are performed by Windaq turnkey data acquisition software at a very high level However the data acquired by the application can be made available in real time by this control In this manner the control allows you to concentrate on specific requirements of the task at hand without regard to mundane and obscure data acquisition details Windaq offers the following features Derives the number of channels sample rate engineering units scaling m and b scaling constants and full scale ranges in engineering units as defined by Windaq software for each channel Provides access to acquired channel data using one of three options immediate mode by defined channel immediate mode by all enabled channels and a stream approach that guarantees waveform continuity Allows asynchronous access to the hardware s digital input and output ports and analog output ports Cautionary note During program development while your program is still in the interpretive mode ensure that the Windaq application is not terminated before the program that is
37. frequency to yield a power spectrum that is representative of the frequency makeup of the time series waveform WINDAQ Waveform Browser software contains three types of Fourier transforms the fast Fourier transform FFT the discrete Fourier transform DFT and the inverse Fourier transform IFT The FFT is the most computationally efficient transform of the three but also the least versatile The FFT function automatically places some restrictions on the time series to be evaluated It requires that the range or length of waveform to be evaluated contains a total number of data points precisely equal to a power of 2 e g 256 512 1024 etc Therefore with an FFT you can only evaluate a fixed length waveform containing 512 points or 1024 points or 2048 points etc For example if your time series contains 1096 data points you would only be able to evaluate 1024 of them at a time using an FFT since 1024 is the highest 2 that is less than 1096 Additionally the FFT also requires that the time series to be evaluated is a commensurate periodic function or in other words the time series must contain a whole number of periods within the FFT bounds Obviously the chances of a section of waveform containing a number of data points equal to a 2 number and having the last point match the first in magnitude and slope are slim at best Significant distortion in the resulting power spectrum can result if care is not taken to ensure th
38. from which the transform was derived Window 2 initially displays the waveform it contained before the transform was invoked but is used as the target window for subsequent IFTs if this feature is activated The waveforms contained in both windows may be manipulated by using the same functions available in the Y T mode of WINDAQ Waveform Browser playback software while a power spectrum is displayed Following the transform three cursors will appear in the Y T waveform area to show the waveform portion that was used to generate the power spectrum WINDAQ AMMOD DAT bl ial File Edit View Search Scaling Transform Options Help 3 339 a Window 1 Window 2 FEN 12 2 3330 iue 2 2 voll A Left Limit Cursor Center Cursor Right Limit Cursor The center cursor is automatically placed in the center of the screen to indicate the center of the FFT The left cursor indicates the left limit of the FFT range which is 256 pixels away from the center on a full screen VGA display The right cursor indicates the right limit of the FFT range which is 255 pixels to the right of the center cursor on a full screen VGA display The actual data used in the FFT calculation is the raw data contained between the two limit cursors Assuming that a compression factor of one 1 was enabled at the time the FFT was activated and a full screen not resized VGA display is used a 512 point FFT
39. marker display field displays on because a cycle has not been defined The time marker formats will be displayed in the marker display field only if time markers are enabled for display If time markers are disabled off is displayed in the marker display field rather than a numerical value WINDAQ Waveform Browser Open Allows you to open and review multiple files from within the playback program e Point to the File menu and drag down to Open This displays the following dialog box Saving changes to current file header Do you want to Save All Save Calibration Proceed with No Save Cancel You are required to select one of these options for the currently active data file before you can switch to a different file Save All command button Saves the entire state of playback data including display format scales 48 offsets compressions calibration constants etc before returning you to the Program Manager Save Calibration command button Saves the calibration data only The next time the data file is reviewed all waveforms will appear calibrated without needing to repeat the calibration process Proceed with No Save command button Proceeds to the Program Manager window without saving calibration or state Cancel command button Returns you to the playback display without saving anything Following your selection of an option for the cur
40. no annotated text 1 Select File Note as follows Point to the File menu and drag down to Note When selected for the first time the Open Notepad File dialog box is displayed on the screen Open Notepad File Filename c playback Cancel Format 2 In the Filename text box enter the name of the file including desired path names to which WINDAQ Waveform Browser is to write the notepad data 41 3 Click OK The procedure for writing data and text information to a notepad file is similar The text is entered in the Notepad Annotation dialog box which is displayed when the Commented Note command is chosen from the File menu The number of text characters that may be stored for each annotated note conforms to the following equation 11 x of channels enabled 22 With the cursor positioned at the desired point on the waveform data and comments can be written to a notepad file as follows Commented Note data with comments 1 Select File Commented Note as follows Point to the File menu and drag down to Commented Note When selected the Notepad Annotation dialog box is displayed on the screen as follows Notepad Annotation Notepad nnotation poll 2 In the Notepad Annotation text box enter the desired comment 3 Click OK Data is written to the target file in a columnar format A maximum of six columns may be written depending upon the number of waveforms i
41. representing the higher end of the range If this text box is left blank the high end of the range is unbounded This limit is retained until a search is done on a different channel or a new file is opened When limits are assigned the lt lt Inside Range lt lt Outside Range Inside Range gt gt or Outside Range gt gt command buttons can be used to move the cursor to the next or previous data point inside or outside of the specified range lt lt Inside Range This command button moves the cursor to the previous data point inside the specified range of values on the selected channel The limiting values are considered inside and are thus included in the range Inside Range gt gt This command button moves the cursor to the next data point inside the specified range of values on the selected channel The limiting values are considered inside and are thus included in the range lt lt Outside Range This command button moves the cursor to the previous data point outside the specified range of values on the selected channel The limiting values are not included Outside Range gt gt This command button moves the cursor to the next data point outside the specified range of values on the selected channel The limiting values are not included Go to Time This function instantly moves the data cursor to the position in the file that corresponds to the specified date and time The date and time can be specified
42. segment The obvious solution is to make sure the waveform is uncompressed when using this function If compression must be used refer to the Help documentation for details on using this function with compression enabled WINDAQ Waveform Browser Note and Commented Note Allows individual data points to be written to a notepad data file on disk with or without text annotation The data sent to the target file are those data points from each channel coincident with the position of the data cursor at the time the NOTEPAD function is invoked 5 DAQ P3445 DA File Edit View Search Scaling Options Help 1 000 000 MAS 1 000 1 386 1 297 ELS EOE pu These four data points 1 912 coincident with the 3520 cursor will be written to the notepad file 4 4 8 3 mmHg 40 40 59 20 89 M 4 nnig 1 16 MID 18 1560 SEC TEF S200 SECH 27 5 XEOF The NOTEPAD function may be invoked at any time during data review The first time during the review session that NOTEPAD is invoked the Open Notepad File dialog box will appear prompting you to name the file to which screen data will be written Any valid file name including path names may be entered Thereafter invoking NOTEPAD sends the selected data directly to that file With the cursor positioned at the desired point on the waveform data can be written to a notepad file as follows Note only plain data
43. specified range If you wish to export only certain channels in a data file refer to the EXTRACT CHANNELS function The range of data to be exported is user definable Created data files may be read by user generated or standard i e ASYST Lotus 1 2 3 Excel Quatro Pro etc software analysis packages or by Advanced CODAS CALC package Before data may be exported to a disk file the copy range must be selected The copy range is defined as all data for each channel lying between the time marker and cursor To select the copy range 1 Position the cursor at one end of the desired range drag the left mouse button in the bottom annotation margin to position the cursor WINDAQ MARK1 WDQ File Edit View Search Scaling Transform XY Options Help 76250 1 1 peg p E A iei e is ssim Tess desired range of waveform ositioned at eginning of desired range 074 am position cursor by dragging left mouse button here ECI 2 Enable the time marker by pressing the F4 key by pointing to the Options menu and dragging down to Enable Time Marker or by choosing Options Enable Time Marker with ALT O M keystrokes WINDAQ MARKI WDG Fie Edit View Search Scaling Transform XY Options Help PAPAA time marker enabled coincident with position of cursor E o il ci 3 Move the cursor in either direction to the other end of the desired range by dragging the l
44. text boxes 9 Complete the chart edge value entry as follows Click OK Your specified values will now be displayed on the upper and lower chart edges and the waveform will be automatically scaled to fit the new values The Next and Previous buttons allow you to step through all of the enabled channels in order entering the desired display limits for each channel without closing this dialog box When using the DI 151RS the following procedure can be used to calibrate the thermistor transducer 1 With the thermistor connected to the DI 151RS as described in step 3 of this fast start procedure submerge the tip of the thermistor in an ice water bath Submerge only the tip of the thermistor do not submerge the DI 151RS Let it remain in the ice water long enough for the thermistor output to stabilize you can monitor the thermistor output with WINDAQ Lite s real time display 2 Follow steps 1 through 4 of the calibration procedure described above but enter 32 in the Low Cal Value text box and F in the Engr Units text box Note that WINDAQ Lite has established the Input Level value automatically 3 Now remove the thermistor from the ice water bath and allow it to stabilize at room temperature 4 Follow steps 5 through 9 above but enter 72 or whatever your room temperature is in the High Cal Value text box and F in the Engr Units text box For convenient display limit values enter 100
45. the included wall outlet type adapter which can be plugged into any single phase 120 volt 60 Hz AC source It features two signal conditioned differential bipolar analog inputs screw terminal access maximum measurement range is defined by the DI 5B modules The DI 195B allows you to plug any two DI 5B signal conditioning modules into its backplane The DI 5B signal conditioning modules then filter isolate amplify and or convert virtually any industrial signal that is applied into a high level analog voltage perfectly suited for recording WiNDAQ Lite Waveform Recording Software and WINDAQ Waveform Browser Playback and Analysis Software The WINDAQ software shipped with all of the serial port instruments consists of WINDAQ Lite waveform recording software and WINDAQ Waveform Browser playback and analysis software WINDAQ Lite waveform recording software can be used with any Dataq Instruments hardware product It allows you to record waveforms directly and continuously to disk while monitoring a real time display of the waveforms on your computer screen It operates at the full sample rate of the instrument being used allowing you to see a real time display of your waveform signals on your computer s monitor at the instruments full sample rate but is limited to 240 Hz maximum throughput when you enter the record mode WiNDAQ Waveform Browser allows you to review measure analyze compress cut and paste exp
46. the normally dimmed Graphic Selection Rectangle radio button This is done by clicking and holding the RIGHT mouse button anywhere in the waveform graphics to enclose the area of interest Once the rectangle is drawn the Graphic Selection Rectangle radio button can be selected Continuous Hard Copy Feature To generate an immediate continuous hard copy you must first select a range of waveform data to be hard copied This range is defined as all data lying between the time marker and cursor To select the copy range 1 Position the cursor at one end of the desired range drag the left mouse button in the bottom annotation margin to position the cursor WINDAG MARKI WDG File Edit View Search Scaling Transform XY Options Help 76250 fod F ppa Un MM TT Aelii ue id E EGRE UR IRR UR N eu EE desir ositioned at eginning of desired range io Q9 e position cursor by dragging left mouse button here ed range of waveform 2 Enable the time marker by pressing the F4 key by pointing to the Options menu and dragging down to Enable Time Marker or by choosing Options Enable Time Marker with ALT O M keystrokes WINDAQ MARK1 WDQ File Edit View Search Seno Transform XY Options Help 76250 1 F V AMO time marker enabled coincident with position of cursor 5 0000 DATA 13 670 SEC TBF 000 SEC TM D71 SEOF T 200 SEC DIV 3 Move the cur
47. were enabled during data acquisition the file will contain 256 equally spaced transparent event markers These markers will not appear on the screen but they will allow you to quickly vector to any part of the data file Activating the Cancel command button will abort the SEARCH FOR EVENT function without vectoring the display to the indicated event number 54 Activating the To Clipboard command button copies all event marker columnar information to the clipboard in text format Since the data is copied to the clipboard in text format as opposed to bitmapped format it can be pasted into a word processing document or a spread sheet and edited The information can be viewed with the Clipboard Viewer feature of Windows to maintain the vertical alignment of the data select the OEM Text display option from the Clipboard Viewer The current position of the cursor relative to date and time is displayed at the top of the screen as Cursor date and time date tim The EVENT column indicates a unique number applied to the event marker at the time it was enabled during data acquisition Event marker numbers are always assigned sequentially i e starting with 1 and incrementing until the last event marker enabled is reached or until the maximum number of event markers is achieved Event marker numbers followed by a star indicate those automatically created by data acquisition at the start of a storage to disk cycle The
48. when the target file is full To enable the beep on file full function Point to the Options menu and drag down to Beep on File Full When enough data has been recorded to fill the allocated file space an audible beep sounds when this function is enabled to warn you that acquisition has stopped and WINDAQ Lite software is in the STBY operating mode WINDAQ Lite Close Allows you to close the data file you are currently working with Closing a data file removes the file from your screen but does not quit WINDAQ Lite software A new data file must first be opened and data must be recorded to it before the Close command is selectable undimmed However the Close command is immediately selectable on an existing data file that you are appending to Once Close becomes selectable you can close a currently open data file as follows Point to the File menu and drag down to Close WINDAQ Lite Save Default Setup Allows all current WiNDAQ Lite recording parameters to become default settings for all subsequent recording sessions When you have set up WINDAQ Lite exactly the way you like you can make this configuration the default so it always appears this way when started To make the current screen design the default condition Point to the File menu and drag down to Save Default Setup Virtually every WINDAQ Lite recording parameter is saved to determine the default condition display format sample rate co
49. which may be moved anywhere on the plot When the FFT is plotted the origin of the cross hair is placed at the strongest frequency component of the waveform by default The position of this cross hair is displayed in the analysis reporting area in terms of its frequency and magnitude as described above The vertical crosshair can be moved to display a specific frequency value in the analysis reporting area Clicking the left mouse button anywhere in the FFT plot area allows you to position the vertical cross hair at the mouse pointer position Dragging anywhere in the FFT plot area with the left mouse button held down allows you to drag the vertical cross hair anywhere on the plot When dragged the horizontal crosshair follows the plot and the analysis reporting area updates to reveal current values After releasing the left button SHIFT F4 will rescale the power spectrum plot to place the horizontal crosshair at the top of the FFT plot area and use it as the OdB reference This rescale can be undone by dragging the left mouse button in the left magnitude scale margin to position the horizontal cross hair at the very bottom of the FFT plot area then by pressing SHIFT F4 again The horizontal crosshair can be moved to display a specific decibel or magnitude value in the analysis reporting area Clicking the left mouse button anywhere in the left magnitude scale margin allows you to position the horizontal cross hair at the mouse pointer p
50. will be generated The analysis reporting area performs a dual role When manipulating the waveforms in the Y T area the analysis reporting area contains information about the waveforms in this area just as a typical playback screen would When examining the power spectrum in the FFT plot area the analysis reporting area changes to display information about the setup conditions and the power spectrum data This data is updated as the cross hair displayed on the power spectrum plot is moved A typical display with the cross hair placed over a frequency of 6 40 Hz with a relative magnitude of 99 34 dB is shown as follows DATA 6 40 Hz X1 99 34 DB hn off XEOF The X1 and hn descriptors define the zoom factor and window currently applied to the spectrum Refer to the X axis Scaling and Power Spectrum Windowing headings below for further information related to these functions When the analysis reporting area is displaying power spectrum data the display can be toggled to show normal waveform information by clicking in the left right annotation area of either waveform displayed in the Y T area Similarly when the analysis reporting area is displaying waveform information the display can be toggled to show power spectrum data by clicking anywhere in the FFT plot area The FFT plot area contains the actual plot of the power spectrum Examining the power spectrum is possible through use of a cross hair
51. window Activating the OK button accepts all of the editing you have done and closes this box Activating the Cancel button closes this box and ignores any editing changes made Note that the display annotation options can be enabled in virtually any combination to provide the desired result However in some instances one annotation option will override another For example it is not possible to enable both limit amp frequency display and acquisition assignments When limit amp frequency display is enabled it will be automatically disabled when you attempt to enable acquisition assignments and vice versa A logical channel number corresponds to a channel number s appearance in a data file The first channel acquired is the first in the file the second is the second etc In Playback logical channels are always specified However during acquisition you have the ability to acquire any number of channels not necessarily in sequential order For example you may have acquired channels 0 2 and 3 These channel numbers are called physical channels 6 relating to the actual physical channel number that provided the waveform Their logical channel numbers are 1 2 and 3 When acquisition assignments are active L P means logical channel number L is assigned to physical channel number P Acquisition assignments annotation provides a convenient method of determining for any given waveform which physical channel number provided t
52. 000 0049 Volt 0000 Scroll 200 By default WINDAQ software always displays channel O in window 1 channel 1 in window 2 channel 2 in window 3 channel 3 in window 4 etc However you can display any channel in any window To display a channel in a window other than its default assignment On Select the window to receive the channel by clicking the left mouse in the unselected window s annotation margin button File Edit View File Edit View File Edit View Mode Oscill Mode Oscill Mode Oscill B s F3 200 S s F3 200 S s F3 200 10 000 1U UUU 10 000 iE 001 001 001 1 0 Volt L 0 Volt i Volt 10 000 l nnn 10 000 unselected click selected window anywhere window to select 2 Point to the View menu and drag down to Assign Channel portion of the variable The channel waveform assignment indicator flashes File Mode 3 Enter Edit View Oscill the desired channel number and press the ENTER key if required 28 lir RE Grow 2X Shrink 2X Waveform Down 1 Pixel Waveform Down 10 Pixels Waveform Up 1 Pixel Waveform Up 10 Pixels Used to dynamically scale or offset a specified channel s waveform on the real time display 1 Select the window that contains the desired waveform Click the left mouse button in the unselected window s annotation margin File Edit View File Edit View File Edit View M
53. 12 point FFT might not show these individual components clearly since its entire power spectrum is only divided into 256 equally spaced points and the desired frequencies are so close together However if the transform contained more points it would be able to devote more points to the definition of closely spaced frequency components The more the number of points in a transform the better the frequency resolution When you select an FFT from the list that is larger than the number of horizontal pixels your screen is capable of displaying the waveform will automatically be compressed This happens semi transparently and requires no additional user input The compression becomes obvious when the split screen display is exited with the View Exit Enter Split command and the normal Y T waveform display is shown If you would like to perform a smaller FFT than what is shown on the list you will have to reduce the amount of pixels your screen has available for display the less you see the less you FFT This can be done primarily by horizontally shrinking or resizing the window that WINDAQ Waveform Browser is running in and to a lesser degree by selecting an overlapped screen format Refer to your Windows documentation for details on resizing the window border For example with a VGA display and an uncompressed waveform it is possible to display a 32 point FFT option by reducing the window to its minimum horizontal size and sel
54. 29 2 EOF E denotes End point or limit cursor approach DFT The window designation is replaced by a C or E which denotes the DFT approach that was applied and by the factors of 2 in the compression factor applied to the waveform being transformed For example in the middle display shown above the C1 descriptor indicates a DFT generated by the time marker and cursor approach with 2 or 2 as the highest power of 2 used in the DFT calculation In some cases an asterisk C will appear in this field This indicates that the power of 2 used in the DFT calculation is 100 or greater the field can only accommodate a two digit number For the same reason when the power of 2 is greater than 9 but less than 100 the C will be dropped from the display field and only the compression factor will be displayed i e 12 Whichever approach you take the DFT provides a more accurate power spectrum plot than the FFT at the expense of added time for set up and calculation The resulting power spectrum may then be examined in the same manner as the FFT GENERATING A DFT USING LIMIT CURSORS To generate a DFT with the limit cursor approach ensure that the time marker is turned off e g press F4 until of f is displayed in the marker display field of the bottom annotation line With the time marker disabled the transform algorithm assumes that the time series is defined by the left and right limit cursors Now move the channel you wish to
55. 7dragging left mouse button here off SEC TM 71 2 SEOF T 200 SEC DIV meet Zd desired range of waveform 5 0000 DATA 12 670 SEC TBF 2 Enable the time marker by pressing the F4 key by pointing to the Options menu and dragging down to Enable Time Marker or by choosing Options Enable Time Marker with ALT O M keystrokes WINDAG MARKI WDG File Edit View Search Scaling Transform XY Options Help 76250 F al Fop PI rara peque Ae nbn A Men time marker enabled coincident with position of cursor ae e el 3 Move the cursor in either direction to the other end of the desired range by dragging the left mouse button in the bottom annotation margin WINDAG MARKI WDQ Edit View Search Scaling Transform XY Options Help 6250 T7 PEREA poea Poqo tT puer Ea al Mond time marker E seme Lii eoe cursor positioned 8 0000 77 at other end of x desired range indicates length Tm L in seconds of ero range move cursor by dragging left mouse Y button here Although the range is specified only on display window one when copied data in all active windows lying between the limits are copied to your specified file name When the data range is selected as described above the extract utility can be invoked as follows D Point to the File menu and drag down to Save As This displays the Save As dialog box Before you enter a file name selec
56. 8 Waveform Down 10 Pixels eee eee dete eese dece eee sepe e gea tuu equ goce A 28 Waveform Up 1 Pixels ix SERIE UR ER e iere oo eta reed beet enero dee ved 28 Wavetorm Up 10 Pixels narinari etes A d ators bo et ect esit cce bein 28 Reviewing Recorded Waveforms with WINDAQ Waveform Browser eee eeee eee e eene eese 29 Moving Around in the Data Eile 5 nerit entr ef Pc permette xe etie iir eder ep deua 29 Autoscroll Right 2 tede eet cene Pe Hei D eee Eee ted PEE HD cbe vede ie 30 Autoscroll D6eft AAA AA A sues ht ttes ee toca mae mes eph 30 Channel Settings dina ed r Di eka ennai dete nde e bene ien 30 Export Usitig Save Aslan CREER 31 AAC m EE 35 Peak oni Scteela oos at aia 35 Valley On Screens ie ete dete re S eI dot RERO TO E eH DI 35 Center elc II O E EE EE ENNE EEE E ES R 35 EOF Distance to End of Filejs menisci e TNS 36 Enable Live Displ y iie etti tene ta a o ee ot ib aa 36 Next Mark PR RR iia 36 Iac GOD CBE dE 36 Insert TT de cnc eim 36 Delete Mark ts A a te Ute ane E Te eoe Ee PL 36 Clear Marks to TM niGGesannhe iii iia 36 Extract Channels Using Save As eri eeke essee apee eiee eer eai aeea nnne nnne n ener eren nnne 37 Free Lock GUutsOr ie ERIT RI UTR e Y IE error 38 Jump to Beeinnimg End of File ette eee tine eret tete re Lente eeu EXC p dere 39 Go to TM Position enin din REO He d RH dI deer de S 39 GOMOURAN LCs E RR 39 Goto
57. Annotates the quantity of time from the beginning of the data file to the point of waveform cursor intersection in seconds To display time from beginning of file in the live display field 1 Point to the Options menu and drag down to Select Live Display 2 Click on Time from Beginning of File When the Time from Beginning of File format is selected the live display field will show XXXXXXXX SEC TBF where XXXXXXXX is the time to beginning of file from the point of waveform cursor intersection in seconds 06613 RYAN Volt Ubsaunie eibi Dara a 18 2720 SEC TBE Time from Beginning of File format enabled 7040 SECCTH Difference From Time Marker Point This format annotates the difference in waveform values between the time marker position and the current cursor position To display the difference from TM point in the live display field 1 Point to the Options menu and drag down to Select Live Display 2 Click on Difference from TM pt When the difference from time marker point format is selected the live display field will show XXXXXXXX DATA TM where XXXXXXXX is the difference in waveform values between time marker position and cursor position Live display field shows the difference in waveform values at the point of time marker and cursor 02838 DATA T Time marker Note that the time marker must b
58. Beginning End of File Instantly moves the display screen to the beginning or end of the waveform file accomplished by Dragging the slider box in the horizontal scroll bar to the leftmost limit for the beginning of the waveform data file or to the rightmost limit for the end of the waveform data file WiNDAQ Waveform Go to TM Position Go to Range and Go to Time Three separate functions that allow you to immediately vector or jump to a specific part of the file Each feature is described as follows Go to TM Position This function instantly moves the display screen to the position of the file occupied by the time marker When at the position of the time marker you can instantly move back to your original position To move to the time marker position Point to the Search menu and drag down to Go to TM Position This moves the display to the position of the previously enabled time marker If the data cursor is enabled for display it will overlay the time marker on the screen Pointing to the Search menu and dragging down to Go to TM Position a second time moves the display back to the original position Go to Range This function instantly moves the data cursor to the next or previous data point that is inside or outside of a specified range of values on the selected channel When a data point satisfying the range and conditions has been found the screen is scrolled to place the cursor at the value of the
59. DATAQ INSTRUMENTS J WINDAQ Lite Pro Pro Waveform Recording Software WINDAQ Waveform Browser Playback and Analysis Software DI 151RS Software Configurable Analog and Digital I O Board DI 195B 2 Channel Serial Port I O Module with Signal Conditioned Inputs User s Manual Manual Revision G Copyright 2000 by Dataq Instruments Inc The Information contained herein is the exclusive property of Dataq Instruments Inc except as otherwise indicated and shall not be reproduced transmitted transcribed stored in a retrieval system or translated into any human or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without expressed written authorization from the company The distribution of this material outside the company may occur only as authorized by the company in writing Dataq Instruments hardware and software products are not designed to be used in the diagnosis and treatment of humans nor are they to be used as critical components in any life support systems whose failure to perform can reasonably be expected to cause significant injury to humans Bi DATAQ INSTRUMENTS 150 Springside Dr Ste B220 Akron Ohio 44333 USA www dataq com Telephone 330 668 1444 Fax 330 666 5434 Designed and manufactured in the United States of America Warranty and Service Policy Product Warranty DATAQ Instruments Inc warrants that its hard
60. Edit View Mode Oscill LU UUU lick unselected selected anywhere window t select window 2 With the desired channel selected select Channel Settings Point to the View menu and drag down to Channel Settings This displays the Channel Settings dialog box as follows Planta mete chanran s Arya oa channel Nose Samole rate H2 250 Samele rate diviser 1 Elective sample rate Piz 258 Acqui sitom meitad Averege Input Qype Linear Gan 1 Input Bowel ep 100 00 input sinis ws Inst ievel tanam 108 08 Dynamic saage tog weze Engineering unite s Dynamic tige bonom 368 24 Usar sen etytan IF SCSAMDAQXGAMPREWDO O Previos To CSpboesd Ned The Next and Previous command buttons allow you to step through all of the enabled channels in order viewing the channel settings for each enabled channel without closing this dialog box The To Clipboard command button allows you to send all of the information in this dialog box to the clipboard in text format ideal for pasting into a word processor or spreadsheet Since the information pasted from the clipboard is in text format not a bitmap the values are separated from the settings labels by tabs and can easily be edited with your word processor or spreadsheet program The following describes each item in the Channel Settings dialog box these items are originally set from within WINDAQ Lite recording software by choo
61. G After the power spectrum is plotted the type of windowing applied to the FFT calculation can be changed WINDAQ Waveform Browser supports four window types Bartlett Hanning Hamming and Blackman The window applied is changed by Pointing to the Transform menu and dragging down to Windowed FFT This displays the FFT Window Type Size and Averaging dialog box from which you simply select a different window and activate the OK command button The window designator is always displayed in the analysis reporting area as follows IDATA 23 4 Hz X1 54 43 DB Ba 30 3 XEOF Bartlett window applied IDATA 23 4 Hz X1 52 95 DB Bl 30 3 XEOF Blackman window applied DATA 23 4 Hz X1 55 17 DB Hm 30 3 EOF Hamming window applied IDAT 23 4 Hz X1 54 59 DB hn 30 3 XEOF Hanning window applied POWER SPECTRUM SMOOTHING After the power spectrum is plotted a moving average filter can be applied to smooth the spectrum The moving average utility takes X data points you specify how many from the spectrum adds them together divides their sum by the total number of data points added replaces the first data point in the power spectrum with the average just computed repeats these steps with the second third and so on data points until the end of the power spectrum is reached This technique attenuates random small amplitude frequency spikes often encountered in a pow
62. START and POWER GND or across R START STOP and POWER GND and you must choose either Remote Storage 1 or Remote Storage O before entering the RECORD operating mode You must be in the RECORD operating mode because the state of the signal on the digital input determines whether data acquisition to disk is enabled or disabled All digital inputs are held high via pull up resistors DII REMOTE STOP START or R START STOP must be taken low to disable data storage When properly connected data storage to disk can be remotely enabled disabled on all high or low levels of the trigger signal To enable data storage to disk when the digital input goes high while in the RECORD operating mode Point to the Options menu and drag down to Remote Storage 1 To enable data storage to disk when the digital input goes low while in the RECORD operating mode Point to the Options menu and drag down to Remote Storage 0 Note that unlike the event trigger signal which is edge sensitive the disk storage trigger signal is level sensitive When remotely storing data to disk manual event marker generation is disabled When the external disk storage trigger feature is enabled an S will be displayed in the status bar immediately following the display mode descriptor as follows External disk storage enabled File Edit Vi Mode Scroll Channels S s F3 100 Compress 5 000 icd caling Optir 23 m8 oo He
63. TBF column indicates the event marker s position in time relative to the beginning of the data acquisition file All values are annotated in seconds The TM column displays the event marker s position in seconds relative to the time marker if the time marker is enabled The EOF column indicates the position of the event marker relative to the end of the data file as a percentage The DATE column displays the date on which the event marker was enabled The TIME column indicates the time at which the event marker was enabled to the nearest second The COMMENT column displays the comment that was provided if any at the time the event marker was enabled during data acquisition Assuming a full 39 character comment was provided for the event marker when it was enabled the comment will appear truncated if the time marker function is enabled Characters consumed by the time marker column are freed for comment display when the time marker is disabled When you scroll the event list to an event number greater than the total enabled during acquisition all columns except EVENT will display The TM column is active only if the time marker was enabled before Event Markers was chosen from the View menu If the time marker was not enabled will be displayed in the TM column If no event markers were enabled during data acquisition playback will pad the data file with 256 equally spaced event markers allowing you to quickl
64. TFT ooooccccnnnnnonocncnnnoooonnnnnnnnnnccnnnononnnnnnncnonnnnnnnnnnnncnnnnnnonnnnnncninnns 68 Editing the Power Spectrum essere nennen nennen nennen enne enne tenete 68 Inverse EET Generation c oett esce cte te tie Retention 68 Transform Calculation Time Considerations eese 68 NIE CR E 69 X Y Plotting 1 e eh ERE Bist ede He ERIT ibas 70 Using ActiveX Controls ose dada 111 Introduction This manual contains information designed to familiarize you with the features and functions of the following serial port data recording modules DI 151RS DI 195B and also with WiNDAQ Lite waveform recording software and WINDAQ Waveform Browser playback and analysis software DI 151RS The DI I51RS is a portable two channel data recording module that communicates through your computer s RS 232 or serial port It can record data at rates up to 240 samples per second with 12 bits of measurement accuracy The DI 151RS is powered directly from the computer to which it is connected through the RS 232 cable The DI 151RS is equipped with a dedicated thermistor input two digital inputs and two single ended bipolar analog input channels DI 195B The DI 195B is a two channel data recording module that communicates through your computer s RS 232 or serial port It can record data at rates up to 240 samples per second with 12 bits of measurement accuracy The DI 195B is powered by
65. The following procedure will install WINDAQ Lite recording software first then WINDAQ Waveform Browser playback and analysis software 1 Start Windows 2 Insert the WINDAQ Resource CD into your CD drive and close the drive tray For most user s the CD s auto run feature will automatically display a list of options for you to pick from If you do not see this list of options after a reasonable period of time double click the My Computer icon on your desktop and then double click your CD ROM icon to manually display the list of options 3 Choose the Install Software button and click OK Now choose the WINDAQ Lite and Software Development Kit button and click OK Specify the instrument series broad category that will be used with WINDAQ Lite software For example choose the DI 1xx Serial Data Acquisition Units button if you have either the DI 151RS module or the DI 195B module connected to your serial port both are 100 Series instruments or choose the DI 4xx Series Plug in Cards button if you have a DI 400 DI 401 or DI 410 board installed etc When the instrument series button is selected click the OK button The remaining installation steps vary by instrument In most cases the on screen prompts provide enough information to successfully get you through the installation However if you are unsure of what to do next or if you need additional information contact Dataq Instruments technical suppor
66. The FFT algorithm supports a number of different sized FFTs size refers to the number of data points contained in the FFT Because the FFT function uses a base 2 logarithm by definition the range or length of the time series to be evaluated must contain a number of data points equal to a 2 number This is why the FFT selections you see in the Number of Points list box are all a power of 2 256 512 1024 etc The number of selections you see displayed in this list box will vary for any one data file depending on the factors that affect this power of 2 limitation These factors include the size of the data file the width of the window that WiNDAQ Waveform Browser is running in on your monitor the screen format whether overlapped or non overlapped and whether or not the data file is compressed The overall size of the data file determines whether or not the larger FFT options such as 8192 and 16384 are displayed in the list box while the size of the window that WINDAQ Waveform Browser is running in and the screen format determines whether or not the smaller FFT options such as 32 64 or 128 points are displayed The minimum sized FFT that can be displayed in the list box is 32 and the maximum is 16384 When the FFT algorithm is first initiated with an uncompressed waveform the FFT selection highlighted in the Number of Points list box is the maximum power of 2 that will fit on the screen For example if you have a VGA displa
67. View ode Oscill a s F3 200 500 00 EOS unselected channel selected channel When the desired channel is selected gain adjustments to that channel are now possible 2 Select the Channel Settings command Point to the Edit menu and drag down to Channel Settings This displays the Channel X Settings dialog box where X represents the enabled channel FS Veit Method Gain FS Volt 1100 10009 10000 input Type Linear r lar Hunlinea Fires Ther nupl Reset ca Hest l Ao The gain factors you see displayed at the top of this dialog box are hardware dependent Displayed next to each gain are the equivalent plus and minus full scale voltages that result from selecting that gain factor These voltages vary by hardware device 3 Click on the desired gain factor 4 Click OK or press the ENTER key As the gain factor for a channel is sequenced upward and downward through gain ranges full scale annotation adjusts to reflect the application of the various gain factors A channel s gain factor cannot be adjusted following the initiation of data storage to disk Only the SET UP operating mode allows gain factor adjustments Unipolar Bipolar Measurement Range Option You can specify whether the signal you will be acquiring is unipolar or bipolar A unipolar signal is one that ranges from 0 to full scale never goes below zero and a bipolar signal is
68. al with waveform channel one always being the first data value written For example if four waveform channels exist the first data value written is channel one the fourth is channel 4 The sequential ASCII data storage format is perhaps the easiest to use from the applications program level but you will pay a price in terms of data file length since it takes 10 characters bytes to represent one data value BINARY WITH CODAS HEADER Use this data storage format to review the created data file with WINDAQ Waveform Browser software This utility is useful when you need to break up a larger CODAS data file into smaller easily manageable units for review by playback software BINARY WITHOUT CODAS HEADER This data storage format like Sequential ASCII is used when you need to access the created data file through your own BASIC FORTRAN C etc applications program But unlike Sequential ASCII the Binary without CODAS header format requires only two bytes of storage to represent one data value thus yielding much smaller data file lengths 33 ASYST When this data storage format is selected playback software stores channel data in a fashion that is directly compatible with the ASYST data storage convention The storage format allows ASYST to input data as a two dimensional array channel number channel data When the ASYST format is invoked you are prompted to select the storage format as either R eal or Dnteger Sel
69. are In the case of the latter two the notepad file will have to be converted from ASCII into the ASYST ASYSTANT format before being read ASYST and ASYSTANT provide the file conversion utilities WINDAQ Waveform Browser Print Allows any playback display currently active on the monitor to be printed hard copied on a compatible graphics printer This function offers a print screen feature a print rectangle only feature and a continuous hard copy feature The print screen feature prints whatever is currently displayed on your monitor in your choice of two formats and two size options The print rectangle only feature prints only the graphics enclosed by the graphic selection rectangle The continuous hard copy feature provides a continuous hard copy record of all data between the time marker and cursor When executed the continuous hard copy is printed immediately from within playback Print Screen Feature To generate a print screen Point to the File menu and drag down to Print This displays the Print dialog box 42 Data to Print O Entire Window O Window Excluding Title and Menu Bars O Graphic Selection Rectangle e Continuous From Cursor to Time Marker TM Window Print Options O Sreich to Page Continuous Print Options CI TBE on left C TBR on right Time zoom factor n Entire Window Prints everything as displayed on the screen could be considered a screen sh
70. ark is removed and the display field shows off 3 Move the cursor away from the time marker in either direction to the other end of the desired range again by using the mouse or the arrow keys DAQ AR DQ via File Edit View Search Scaling Transform XY Options Help 625 F F 5 0000 DATA off SEC TBF off SEOF 975 SEC TM As the cursor is moved the time difference between the cursor and time marker will be displayed in the bottom annotation margin in one of four selectable formats refer to the SELECT MARKER DISPLAY function for more details on time marker display formats Time differences are annotated as both positive and negative numbers When the cursor is to the right of the time marker the time difference will be displayed as a positive value When the cursor is to the left of the time marker t
71. at end points match as demonstrated by the following figure oe mismatched end points Suas un matching end points I HC FFT Range 3 p time series of pure 1kHz sine wave p Power spectrum of pure kHz sine we Iz sine wave over a matching end point range ry 1kHz 1kHz End point mismatches over the FFT range can result in significant power spectrum distortion Fortunately a number of solutions exist to minimize the effects of end point mismatches One solution is to window the time series waveform so that the distortion is greatly attenuated or reduced to zero depending upon the window type This approach multiplies the time series waveform by a function resembling a bell shaped curve before applying the FFT The section titled FFT GENERATION describes how windows may be applied to correct the power spectrum of time series waveforms generated over a number of points equal to a power of 2 Refer to the subheading in this section titled WINDOW OPTIONS FOR FFTs for further information on FFT window options Another solution abandons windowing in favor of allowing the user to precisely define the range over which the transform is calculated This approach nullifies the 2 limitation and is known as the DFT Refer to the subheading in this section titled DFT GENERATION for further information on Fourier transform generation over variable user defined ranges The IFT allo
72. can be enabled or disabled in any combination to customize the waveform display Data Display Enables disables the display of data values or baseline values in the left right annotation margin If neither limit amp frequency display nor acquisition assignments are enabled the engineering units toggle on and off along with the baseline value To enable Data Display if disabled or disable it if enabled Point to the Options menu and drag down to Data Display When enabled the annotation margin will have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the Data Display command Data display enabled Edit ze Search Limit amp Frequency Display Enables disables the display of upper and lower chart edge limits in the left right annotation margin assuming the display window is large enough to have limits If acquisition assignments were displayed when the limit amp frequency display was enabled engineering units replace them at the baseline If data display is disabled when the limit amp frequency display is enabled engineering units toggle on and off along with the limits To enable Limit amp Frequency display if disabled or disable it if enabled Point to the Options menu and drag down to Limit amp Frequency Display When enabled the annotation margin will have the following appearance and a check mark V will be displayed on th
73. cant engineering units using any known or verified transducer output values For example suppose you were acquiring pressure data with a transducer that had a known output of 1 volt at O psi and 4 5 volts at 100 psi Whether these output levels were read from the manufacturers specifications or verified through use they can be used as calibration values With this method you can even calibrate the data without knowing the transducer output relationship Simply let WiNDAQ Lite software establish these output voltage values for you For example suppose you were acquiring pressure data and you had no idea what kind of output voltages to expect from the transducer you re using You could vent the pressure apparatus to quiescence or atmospheric pressure and observe what voltage the transducer is outputting at quiescence from the Input Level text box in the Low Calibration dialog box select Low Calibration from the Edit menu In this same dialog box enter what you would like this quiescent state to be such as 0 in the Low Cal Value text box and enter PSI in the Engr Units text box Now activate the OK command button to close the dialog box and increase the pressure until the manometer reads a convenient value say 100 psi In a similar manner observe what voltage the transducer is outputting at this 100 psi level from the Input Level text box in the High Calibration dialog box select High Calibration from the Edit me
74. converter s range This value is a voltage either 5 00 or 10 00 volts if the channel was truly used for recording or it will be expressed as a percentage of full scale 100 00 if this is a calculated channel created by Advanced CODAS Analysis Software Dynamic range top Displays the engineering unit value at the top of the A D converter s range This value will be an engineering unit value if the channel was calibrated in WINDAQ Lite or it will be expressed as a percentage of full scale 100 0096 if the channel was not calibrated Engineering units Displays the units used to calibrate the waveform in WINDAQ Lite or it displays FS percent full scale if the channel was not calibrated Dynamic range bottom Displays the engineering unit value at the bottom of the A D converter s range This value will be an engineering unit value if the channel was calibrated in WINDAQ Lite or it will be expressed as a percentage of full scale 100 0096 if the channel was not calibrated User annotation Displays any channel specific user annotation that may have been entered during recording File Displays the name and path of the file you re working with lao Waveform Browser Export Using Save As Allows you to copy a range of waveform information from an existing data file and export it to a new file in a variety of different storage formats This function exports all channels in the data file lying between the
75. ctor Power of 2 Averaged DFT All odd factors Compression factor 607 2 2 1 1214 607x2 4 4 1 2428 607x4 6 2 3 1214 8 8 1 4856 607x8 10 2 5 1214 12 4 3 2428 14 2 7 1214 16 16 2 4856 18 2 9 1214 20 4 5 2428 22 2 11 1214 24 8 3 4856 26 2 13 1214 28 4 7 2428 30 2 15 1214 32 32 4 4856 34 2 17 1214 The maximum number of data values that may be transformed is 8191 Any combination of compression factor and pixels contained between the right and left limits that exceeds this value will be automatically transformed by removing as many factors of two as necessary from the highest power and multiplying the number of points averaged by the factor removed To illustrate an example from the table above suppose we need a compression factor of 10 to compress the waveform enough so the area of interest can all be seen on the screen So we enter 10 as our waveform compression factor and then perform the DFT The value from column B is derived by evaluating the expression 2 where the exponent x is the number that appears in the EX descriptor field of the analysis reporting area a direct result of the compression factor In our example a 1 appears in the EX descriptor field of the analysis reporting area when a compression factor of 10 is used so 2 2 The value in column B is then divided into the waveform compression factor to get the value in column C which is the number of data points averaged In our example 10 2
76. d will show XXXXXXXX Hz TM where XXXXXXXX is the frequency in scientific notation of the cycle defined by the positions of the time marker and Cursor Time marker Cursor 02891 1L 03784 Volts Frequency in Hz format enabled Aap as ia a en DATA 13 0870 SEC TBF 1 3708 01 Hz TH Note that the time marker must be enabled for display with this format If the cursor is positioned directly on top of the time marker the marker display field displays on because a cycle has not been defined Cycles per minute for Cycle to Marker Displays a frequency in cycles per minute for the section of waveform or cycle defined by the cursor and time marker To display the frequency in cycles minute of the selected cycle in the marker display field 1 Point to the Options menu and drag down to Select Marker Display 2 Click on Cycles min for Cycle to Marker When selected the marker display field will show XXXXXXXX C M IM where XXXXXXXX is the frequency in scientific notation of the cycle defined by the positions of the time marker and cursor j rsor Time marker Curso 02891 03784 E volt A Em vo Frequency in Cycles per minute format enabled 14547 DATA TBF 8 219E 02 Note that the time marker must be enabled for display with this format If the cursor is positioned directly on top of the time marker the
77. ded region The left and right limit cursors and data cursor may be placed anywhere in the Y T waveform area with the following limitations 1 The left limit cursor may not be moved to the right of the data cursor or past the left edge of the screen 2 The right limit cursor may not be moved to the left of the data cursor or past the right edge of the screen 3 Movement of the data cursor is restricted to the region between the left and right limit cursors When the data cursor is moved between the left and right limit cursors the X Y plot remains stable while the cross hairs trace the X Y plot to indicate the position of the data cursor on the X Y plot To move the left or right limit cursor Position the mouse pointer in the analysis reporting area directly underneath the desired limit cursor 2 Drag with the left mouse button to move the limit cursor to the desired position Note that when the left mouse button is pressed the limit cursor changes from a dotted line to a solid line in the Y T waveform area When the left mouse button is released the limit cursor remains a solid line until a different limit cursor is adjusted To move the data cursor 71 Position the mouse pointer in the analysis reporting area directly underneath the data cursor 2 Drag with the left mouse button to move the data cursor to the desired position There are two ways to generate an X Y plot statically or dynamically B
78. display format scales offsets compressions calibration constants etc Save Calibration command button Saves the calibration data only The next time the data file is reviewed all waveforms will appear calibrated without needing to repeat the calibration process Exit with no save command button Exits without saving calibration or state If calibration data was previously provided and saved the constants provided are unaffected by this command They remain intact for future file review Cancel command button Returns to playback without saving anything cancels your exit request WiNDaorLite ird WWB AAA Grids Enables or disables the real time waveform display grid pattern DI 170 Acquisition MARK1 WDQ File Edit View Scaling Options Help Channels 0 1 Compress F7 1 Storage 2 1 used Mode Oscill Sis F3 200 6250 H gec DIV 0 2 Status STBY Grid enabled l Grid disabled DI 170 Acquisition MARK1 WDQ File Edit View Scaling Options Help Channels 0 1 Compress F7 1 Mode Oscill S s F3 200 6250 Storage 2 13 used gec DIV 0 2 Status STBY To enable grid lines for display if disabled or disable them if enabled Point to the Options menu and drag down to Grids When grid lines are enabled a check mark N is displayed on the Options menu immediately preceding the Grids command When grid lines are disabled the check mark is not disp
79. dows waveform at the point of waveform cursor intersection Repeating this action toggles the event marker from positive going to negative going Note that this procedure will work on any channel except channel 1 Note also that the waveform must be uncompressed waveform compression must equal 1 to insert an event marker Delete an Event Marker Point to the Edit menu and drag down to Delete Mark This deletes an event marker from the selected window s waveform that is coincident with the waveform cursor Note that this procedure will work on any channel except channel 1 Note also that the waveform must be uncompressed waveform compression must equal 1 to delete an event marker Clear all Event Marks Between Cursor and Time Marker On Selected Channel Point to the Edit menu and drag down to Clear Marks to TM This deletes all event marks from the selected channel that occur between the cursor and time marker The range can be defined by positioning the cursor at one desired limit enabling the time marker by pointing to the Options menu and dragging down to Enable Time Marker then moving the cursor over to the other desired range limit If this function is used on channel 1 only the negative going marks are deleted This is because channel one contains event mark information enabled by the data recording program These are stored as positive going markers in the waveform data stream and are not to be deleted
80. e 2 point and linear regression rate of change is displayed in the analysis reporting area by Pointing to the XY menu and dragging down to Slopes When the 2 point and linear regression rate of change function is activated the analysis reporting area will display DATA 5 581E 02 LRSLOPE 9 946E 04 2PSLOPE off EOF Where the value to the left of LRSLOPE is the rate of change of the best fit linear regression line and the value to the left of 2PSLOPE is the rate of change of a line intersecting the two defined points In addition a vector will be drawn on the X Y screen connecting the two points over which the 2 point derivative is calculated As with instantaneous rate of change the derivative is presented in units of channel Y s units divided by channel X s units For example if channel X s Y T waveform is calibrated 73 in units of PSI and channel Y s in units of Liters the rate of change is expressed in units of Liters PSI Calculating Areas Bounded By Curves Using the cross hair to target specific bounded areas of the X Y plot it is possible to determine the area bounded by the curve When the desired X Y plot is displayed on the screen and the plot area to be determined is completely enclosed adjust the cross hair such that its origin lies within the area to be determined To fill the enclosed area and calculate the area it occupies Point to the XY menu and drag down to Area When the area functio
81. e Options menu and drag down to Start Time This displays the date and time the file was opened for acquisition in the S display field at the lower right corner of the bottom annotation line To Display End Time Point to the Options menu and drag down to End Time 50 This displays the date and time the file was closed for acquisition in the E display field at the lower right corner of the bottom annotation line e end time enabled To Display Cursor Time Point to the Options menu and drag down to Cursor Time This displays the date and time at the current cursor position in the C display field at the lower right corner of the bottom annotation line This option lets you position the cursor anywhere in the data file and find out exactly when a certain event occurred To Display Time Division Point to the Options menu and drag down to Time Division This displays the time per screen grid division in the T display field at the lower right corner of the bottom annotation line 5 0000 ili DATA 19 020 SEC TBF LOTE BEC OI REO time per division enabled m Waveform Browser Data Display Limit amp Frequency Display Acquisition Assignments User Annotation and User Annotation Allows you to configure waveform display annotation many different ways Annotation options data display limit amp frequency display acquisition assignments and user annotation
82. e Options menu immediately preceding the Limit amp Frequency Display command View Search Limit display enabled Acquisition Assignments Enables disables the display of acquisition assignments in the field normally used for engineering units When enabled the logical vs physical channel number assignments replace the engineering units at the baseline and upper and lower chart edge values are also displayed Note that it is impossible to enable both acquisition assignments and the limit amp frequency display option at the same time If the data display 51 option is enabled the logical vs physical channel number assignments revert to engineering units instead of toggling off when acquisition assignments are disabled To enable Acquisition Assignments if disabled or disable them if enabled Point to the Options menu and drag down to Acquisition Assignments When enabled the annotation margin will have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the acquisition assignments command acquisition assignments File Edit View Search enabled E pod og 5 0000 User Annotation Enables disables the display of user channel annotation provided during acquisition To enable User Annotation if disabled or disable it if enabled Point to the Options menu and drag down to User Annotation When enabled the waveform st
83. e desired comment up to 39 characters in the text box The comment will be displayed with its associated event marker when Event Markers is selected from the View menu in the WINDAQ Waveform Browser playback and analysis software package A commented event marker is anchored at its position in the data file the instant the event marker function is enabled Data acquisition to disk continues while you enter your comment If the Cancel command button is chosen while recording the event marker will not be deleted from the data or trailer file but the comment will be blank If the Cancel command button is chosen while not recording the comment will be applied to the start acquisition marker generated automatically when the next RECORD mode is activated In this case the comment may be changed or canceled at any time before activating RECORD When the desired comment is entered close the dialog box by Clicking the OK command button It is possible to preprogram a comment for the automatically generated start acquisition marker While in the SET UP or STBY operating modes choosing Insert Commented Mark immediately causes the Event Marker Comment dialog box to appear prompting you for an event marker comment When entered the comment will be automatically associated with the very next event marker stored to the data file upon transition to the RECORD operating mode Event markers are saved to disk along wit
84. e enabled for display with this format If the cursor is positioned directly on top of the time marker and compression is 1 the live display field shows zero no difference It is possible to see a negative difference value in the live display field This occurs when the cursor is moved to a point on the waveform that is smaller than the value of the waveform at the time marker If waveform compression is enabled the data values reported by the time marker and cursor will be MID MIN or MAX line segment values rather than a single data point value that would be displayed on an uncompressed waveform Percent Change from Time Marker Point This format annotates the percent change in waveform values between the time marker position and the current cursor position To display the percent change from TM point in the live display field 1 Point to the Options menu and drag down to Select Live Display 2 Click on Change from TM pt When selected the live display field will show XXX XX SCHANGE where XXX XX is the percent change in waveform values between time marker position and cursor position 46 Live display field deseen Hee shows the percent change in waveform values at the point of time marker and cursor 73N SEC TM 42 86 XCHANGE Cursor Time marker Note that the time marker must be enabled for display with this format If the cursor is positioned directl
85. e independent or X axis variable and the other waveform as the dependent or Y axis variable Once plotted this function allows some analysis of the resulting X Y plot i e measure excursions slopes and areas Before an X Y plot can be generated you must decide which channel will be the independent or X axis variable and which will be the dependent or Y axis variable The channel assigned to display window 1 is defined as the X waveform and the channel assigned to display window 2 is defined as the Y waveform Any channels may be assigned to display windows and 2 For example typing 1 3 and 2 12 causes waveform channel 3 to be displayed in window 1 thus designating it as the independent X variable and waveform channel 12 to be displayed in window 2 thus designating it as the dependent Y variable With the desired channels moved into display windows 1 and 2 the X Y plot can now be generated as follows Point to the XY menu and drag down to Exit Enter XY This displays the following X Y plotting screen Left X Y Data limit cursor cursor Right X Y limit cursor Window 1 X Window 2 Y Y T waveform area bez Analysis reporting area pat 600 96 F 3 74487 SEC TM off SOF I Resulting X Y plot B from shaded area above X Y plot area SS Cross hair origin indicates location of data cursor Cross hairs gt
86. e is 10 volts However if we set the gain to 2 the full scale measurement range becomes 5 volts The full scale measurement range gets even smaller for gain factors of 4 range 2 5 volts and 8 range 1 25 volts If the signals you plan to record need the wide measurement range that a gain of 1 provides then skip this step Otherwise continue with this step to select a higher gain factor thus narrower measurement range for the best possible measurement resolution Since gain and measurement range can be assigned per channel the desired channel must first be selected 1 Select an analog channel for gain adjustment O Click the left mouse button in the unselected channel s annotation margin File Edit View ode Oscill a s F3 200 click EA anywhere In shaded area to 1000 00 select 500 00 Volt 00 The focal point for selecting a channel for any type of adjustment is the variable waveform assignment indicator File Edit View Mode Oscill variable B s F3 200 ies o Waveform assignment indicator This two element equality X Y is displayed for every enabled channel Element X 1 in the illustration above is the window number Element Y 0 in the illustration above is the analog channel assigned to that window When selected a box surrounds the variable waveform assignment indicator indicating that the window is enabled for adjustment File Edit
87. e live display field is disabled off is displayed in the field with the last selected format Wi nDaa Waveform Browser Next Mark Previous Mark Insert Mark Delete Mark and Clear Marks to TM Next Mark and Previous Mark provide a convenient method for moving from one event marker location to the next on a selected channel Insert Mark and Delete Mark allow a positive or negative going event marker to be placed on or deleted from any enabled window s waveform except waveform channel 1 After a channel has been selected you must enable event markers for display This is done by Pointing to the Options menu and dragging down to Event Marks When event markers are enabled for display a check mark V is displayed on the Options menu immediately preceding the Event Marks command When event markers are disabled the check mark is removed With event markers enabled for display use the following procedures to move among event markers D Search for Next Event Marker Point to the Search menu and drag down to Next Mark This moves the window in the positive time direction to the next event marker Search for Previous Event Marker Point to the Search menu and drag down to Previous Mark This moves the window in the negative time direction to the previous event marker Insert an Event Marker Point to the Edit menu and drag down to Insert Mark This inserts a positive going event marker on the selected win
88. e menu While in this operating mode all waveform recording features and functions are available except channel specific operations i e channel number offset etc and sample rate adjustments In this mode only the real time display is active waveform recording to disk has been stopped When in this mode the Status area of the bottom annotation line displays STBY It is possible to start and stop the recording process as many times as you like during a data acquisition session Getting Started The following items are included with each instrument purchase Verify that you have the following DI 151RS or DI 195B instrument Communications cable designed to connect the instrument to your computer s serial port with the DI 195B the AC power adapter is integrated into the serial cable WINDAQ software diskette s We are currently shipping both WINDAQ Lite and WINDAQ Waveform Browser software all on one disk However that may change at any time in which case you will have two diskettes This user s manual which covers the hardware aspects of the DI 151RS and DI 195B serial port modules and also documents WINDAQ Lite waveform recording software and WINDAQ Waveform Browser playback and analysis software If you purchased a DI 195B you should also have one or two DI 5B plug in modules Note that these are extra cost items not included with the purchase of the DI 195B kit but are required for operation If a
89. e screen X Y plots appearing on your screen that are not bound i e areas that are not completely surrounded by an X Y trace may be forced closed by Pointing to the XY menu and dragging down to Clear Areas When this feature is activated the two end points of the X Y plot are connected with a straight line allowing the now closed area to be calculated using the procedure described above If Clear Areas is chosen while there are active area fills on the screen they will be cleared and NEWAREA and TOTAREA are reset to zero Calculating Adjusted Area When an X Y plot is displayed with one or multiple area fills an adjusted area may be displayed that includes all X Y traces passing through the filled area as well as half of the fill area s border To adjust the enclosed area s and calculate the area it occupies Point to the XY menu and drag down to Adjust Area When the adjust area function is activated the desired plot area is adjusted and the analysis reporting area will display DATA 5 599E 01 NEWAREA 1 004E 01 ADJAREA off EOF Where the value to the left of NEWAREA is the amount by which the area was adjusted the amount occupied by the traces passing through the fill and half of the fill s border and the value to the left of ADJAREA is the total area fills plus the value shown to the left of NEWAREA Selecting Adjust Area a second time causes the value to t
90. e transducer output is unknown we would also enter 100 in the High Cal Value text box after 100 psi has been applied in our example ignore the Input Level text box WINDAQ Lite software has established the input voltage level for you and enter psi in the Engr Units text box 6 Complete the high calibration entry as follows Click OK The High Calibration dialog box disappears and the waveform channel displays all waveform data values calibrated in the chosen engineering units If desired the upper and lower grid limit values may be specified and the waveform automatically scaled to fit This feature allows the channel s full scale display span to be shown in whole numbers rather than obscure fractional values which sometimes result from calibrating For example a waveform scaled in mmHg can be automatically expanded or contracted to fit within grid limits of O to 100 mmHg or 200 mmHg to 200 mmHg or whatever is desired Note that a channel spanning 0 200 mmHg is much easier to read and interpret on a per division basis than one that spans 10 372 189 628 mmHg To specify convenient upper and lower chart edge values 7 Select Scaling Limits as follows Point to the Scaling menu and drag down to Limits This displays the Display Limits dialog box mT Top Limit Bottom Limit 10 000 CE one orte 8 Type convenient top and bottom chart edge values in their respective
91. eX controls are so valuable They eliminate the pages of programming They eliminate the possibility of mistakes They do the work for you An ActiveX control can best be described as a software module that performs a specific function Multiple ActiveX controls can be combined to perform a multitude of functions In fact Active X controls from any combination of vendors may be combined as though one vendor supplied them all In one line you ll be able to refer to numerous lines of code that have already been tested and are ready to go to work for you ActiveX controls have three types of functions properties methods and events Properties are the attributes of the control They describe the appearance and operation of the control Methods are function calls inside the control that allow information about the control to be sent or received Events are notifications generated by a control in response to some particular occurrence ActiveX controls can be easily put in any application that supports them For example it takes two steps to use an ActiveX control in Visual Basic 1 Right click on the tool bar and select Components from the pop up menu O v Dockable Hide 75 2 A window will open with all of the components that are installed on your computer Check the boxes in front of the five DATAQ Instruments components Then click OK Controls Designers Insertable Objects AxBrowse AxCt
92. ect Dnteger if you do not need to have waveform data scaled into engineering units This format allows more data to be ported into ASYST ANT arrays Select R eal if you need the waveform data ported to ASYST ANT to be scaled in engineering units You can also enter up to two optional comment lines that you may use to describe your particular test The aggregate sample rate is automatically entered as a comment The sample rate as well as any additional comments you provide will be printed on your monitor by using the ASYST FILE command when you retrieve the data file into ASYST ASYSTANT Although the data storage format for ASYSTANT including R eal and I nteger conversions is identical to ASYST data files are imported slightly differently An ASYSTANT ASYST formatted file is imported to ASYSTANT by using the FILE I O option and specifying a FILE VAR TRANSFER Enter the data file name and the ASYSTANT variable that will be assigned the data for this example we will assume variable T was specified and select the READ option at the bottom of ASYSTANT s FILE INPUT OUTPUT menu Quit the FILE I O menu and return to the upper most ASYSTANT menu Notice that variable T indicates the size of the data array You may now operate on the data contained in variable T using all of ASYSTANT s powerful routines A NOTE TO ASYST AND ASYSTANT USERS When waveform data are pasted in the ASYST ASYSTANT storage format using the Dnteger c
93. ecting an overlapped screen format The FFT algorithm also supports input averaging Input averaging allows you to perform FFTs on more data points than the value selected in the Number of Points list box For example suppose you have a waveform file that contains 82 000 data points and you want to perform an FFT on the entire file The largest FFT selection available in the Number of Points list box is 16384 which is nowhere close to 82 000 However input averaging provides a way for you to perform an FFT on the entire 82 000 point file This is done by averaging the total number of data points to be transformed For every N points on the original waveform input averaging develops a single point on the transformed waveform You have complete control over the number of data points that will be averaged to form each FFT input point The number you enter in the Input Averaging text box determines the number of data points that will be averaged to form one FFT input point In our example an input averaging factor of 5 should be entered since 82 000 16384 equals approximately 5 This means that for every 5 data points in the original file an average value is computed This value now forms a single point on a waveform that will be used as the input to the FFT algorithm It should be noted that because you are averaging data points some distortion will occur in the power spectrum Averaging the input waveform values will not give you a true r
94. eft mouse button in the bottom annotation margin WINDAQ MARK1 WDQ File Edit View Search Scaling Transform XY options Help 76250 Td Pa ds cd and sexe Lii tor cursor positioned 5 0000 OS at other end of f desired raige indicates length i 22 in seconds of eos move cursor by range oe dragging left mouse Y button here When the copy range is selected as described above the export utility is invoked as follows Point to the File menu and drag down to Save As This displays the Save As dialog box Before you enter a file name select a file storage format The file storage format selections are displayed by Clicking the Format gt gt command button The file storage format selections appear on the right side of the dialog box as follows text box check box Filename wpa A visible channels only sample wdq c windag f 1 ASCII sequential El 0 2 Binary with CODAS header W soe lt 3 Binary without CODAS header a be d See f Cancel O 4 ASYST ANT i f cancer JO 5 Spreadsheet print aa t Format gt gt 8 Deferred Hard Copy jO 7 DADISP 8 CALG KO 9 EASYEST LX or AG A nSoft DAC format option buttons command buttons Select the storage format by Clicking the desired format option button With the desired format selected enter in the text box the name of the data file including desired path
95. el 1 configured and it is a differential channel Channels field reads 1D Typing 1D will not remove it from the row Typing 1 will however change it to a single ended channel and vice versa Channels may not be added after the RECORD mode has been entered a Viewing Enabled Channels This step allows you to display onscreen all enabled channels If you enabled more channels in the previous step you will want to display them all onscreen 1 To display enabled channels 1 Point to the View menu and drag down to Format Screen 2 In the format box click the desired display format Any channel may be displayed as an overlapping or non overlapping display DI 170 Acquisition File Edit View Scaling Options Help Mode Oscill Channels 0 1 2 3 S s F3 800 Compress F7 1 Storage o s CHAN 200 Status GET UP sec DIV 0 1 non overlapped display overlapped display DI 170 Acquisition File Edit View Scaling Options Help Mode Oscill Channels 0 1 2 3 Compress F7 1 Storage 7036 Status SET UP sec DIV 0 1 is s CHAN 200 An overlapped format allows you to closely examine the time and amplitude relationship of two waveforms A non overlapped format may be used to isolate each waveform s transition to within a defined area Whatever the timing relationship of your input signals any display format may be enabled at any time without affectin
96. el moves the waveform up a single pixel in the window while Waveform Up 10 Pixels moves the waveform up 10 pixels As a scaling or offset operation is performed on any selected channel the channels annotated full scale and base line values will automatically adjust to reflect the operation Scaling and offsetting data does not in any way affect the information stored to disk These Operations are only provided to configure the real time display Reviewing Recorded Waveforms with WINDAO Waveform Browser After waveforms have been recorded WINDAQ Waveform Browser playback and analysis software is used to make timing and amplitude measurements review event markers overlap waveforms to examine interdependencies cut and paste portions of the waveform and do all forms of interpretive analysis To run WINDAQ Waveform Browser software click or double click the WWB icon The first four items listed below are the functions you will use most in the WINDAQ Waveform Browser They involve moving around and otherwise navigating through the WINDAQ Waveform Browser WINDAQ Waveform Browser s Moving Around in the Data File Smooth scrolling panning or paging of waveforms in either a right to left positive time or left to right negative time direction are possible in the WINDAQ Waveform Browser The horizontal scroll bar controls waveform scrolling With it you can move from one part of the waveform file to another
97. en configuring your DI 195B the signal to be measured is ground referenced or the signal to be measured is isolated from ground In either case it is important to properly connect the differential amplifier Ground Referenced Signal Sources A ground referenced signal source is one with a local ground that may not be and probably is not at the same potential as the computer s ground This potential difference between signal ground and computer ground is referred to as a common mode voltage and is caused by a number of different factors 2v signal computer source ground ground potential difference common mode voltage The most common of these is different physical locations of the computer and signal ground points Since wire is not a perfect conductor i e exhibiting Zero resistance regardless of length a voltage drop however small will always be present The differential amplifier is unique in its ability to measure signals originating from sources with different ground potentials relative to the computer providing it is connected properly WRONG APPROACH Circulating currents in signal shield induce noise on signal of interest instrument signal source t input terminals signal lead X differential shield amplifier Ground loop LET M caused by circulating currents The most common error made in connecting differential amplifiers is the tendency to ground both e
98. enable or disable the display of event markers Point to the View menu and drag down to Event Markers This displays the Event Markers window as follows Cursor Date and Time 03 12 92 14 48 39 Event TBF XEO 1 000 DATE TIME COMMENT 03 12 92 14 48 36 03 12 92 14 48 39 03 12 92 14 48 40 690 03 12 92 14 48 41 630 7 7 03 12 92 14 48 42 Intervention 1 F 0 4 670 4 6 7 590 15 9 03 12 92 14 48 49 7 7 9 9 6 7 E 0 800 4 5 6 3 4 5 6 13 14 330 16 7 03 12 92 14 48 50 9 15 210 17 7 03 12 92 14 48 51 16 230 18 9 03 12 92 14 48 52 17 03 12 92 14 48 53 Intervention 2 27 03 12 92 14 49 03 28 03 12 92 14 49 04 880 20 120 31 060 32 oK To Clipboard While the Event Markers window is displayed you may scroll through the list of all enabled event markers as follows Click the up or down scroll arrow on the right side of the window to scroll one line at a time Click in the scroll bar above or below the slider box to scroll 12 lines at a time Drag the slider box to go to a specific part of the list When a specific event number is highlighted activating the OK command button or double clicking on the highlight bar repaints the playback screen with the segment of waveform that contains the specified event number If the data cursor is enabled for display the cursor will appear positioned directly over the specified event number If no event markers
99. epresentation of the original signal in the power spectrum but instead will give you a very close approximation There are also some limits on the number you can enter in the Input Averaging text box First it must be a whole number fractional values are ignored Second the maximum number or input averaging factor that can be input is a function of the total number of samples in the channel to be transformed divided by the selection made in the Number of Points list box After the data window type number of points and input averaging optional selections have been made activate the OK command button to calculate the FFT When calculated the following screen is displayed This screen is composed of three basic sections the Y T waveform area the analysis reporting area and the FFT plot area 59 WINDAQ AMMOD DAT zle File Edit View Search Scaling Transform Options Help 3 339 EEN 12 1 3330 2 2 voir ATA e40 Hz X1 0 00 e p Y T waveform area 33 31 DE hm off BOF Analysis reporting area gt 6 21 12 42 18 63 24 83 31 04 37 25 43 46 49 67 55 88 62 05 68 30 74 50 80 71 EE L4 A LL ah An example screen showing how the FFT screen is divided FFT plot area The Y T waveform area is divided into two windows window 1 and window 2 Window 1 displays the waveform
100. er in the bottom annotation line underneath the desired limit cursor 2 Drag with the left mouse button to adjust the position of the limit cursor Note that when the mouse button is pressed the limit cursor changes from a dotted line to a solid line in window 1 When the mouse button is released the limit cursor remains a solid line until a different limit cursor is adjusted Note that the cursors can be moved in either direction but the right limit cursor cannot be moved to the left of the center cursor and the left limit cursor may not be moved to the right of the center cursor Note also that the center cursor is ignored except when it becomes necessary to adjust it to allow the desired placement of the left and right limit cursors In cases where compression is enabled the number of points contained in the resulting DFT is a function of both the compression factor and the number of pixels laying between the right and left limit cursor or in other words window size The relationship of compression to the number of points in the power spectrum is described by the following table In this table a random assumption was made about how many pixels were contained between the right and left limit cursors To demonstrate the math we randomly assumed 607 pixels were contained between the right and left limit cursors Column A Column D Waveform Column B Column Points Compression Highest Number of Points Contained in Fa
101. er spectrum plot You control the amount of smoothing by specifying the moving average factor Available factors are no averaging 1 or factors of 2 3 4 5 6 8 10 12 16 20 24 32 40 and 48 When displayed the spectrum can be smoothed as follows Point to the Transform menu and drag down to Average Power This displays the Power Spectrum Smoothing dialog box Power Spectrum Smoothing From this dialog box highlight the smoothing factor or number of points to be averaged and choose OK This displays the FFT Window Type Size and Averaging dialog box from which you simply select a different window and activate the OK command button The smoothing factor chosen is displayed in the analysis reporting area as follows IDATA 23 4 Hz X1 52 95 DB Bl 30 3 XEOF No smoothing applied IDAT 23 4 Hz X1 51 13 DB2 B1 30 3 XEOF Smoothing factor of 2 applied IDAT 31 3 Hz X1 50 64 DB3 B1 30 3 EOF Smoothing factor of 3 applied IDATA 31 3 Hz X1 49 81 DB4 B1 30 3 EOF Smoothing factor of 4 applied X AXIS SCALING When a power spectrum is plotted the entire spectrum is displayed on the screen regardless of the number of points in the transform If a transform containing a large number of points is performed the resulting power spectrum is compressed in order 65 to fit on one screen width This is fine for spotting the overall trend of a spectrum
102. ere in the bottom annotation line to move the cursor to the lowest displayed waveform valley When not specified the left mouse button is assumed for the procedure Point means to position the mouse pointer until the tip of the pointer rests on what you want to point to on the screen For example Point to the View menu Click means to press and immediately release the mouse button without moving the mouse For example To display the menu that contains the command you want click the menu name in the menu bar Double click means to click the mouse button twice in rapid succession For example Double click the icon to start the program Drag means to press the mouse button and hold it down while you move the mouse then release the button For example Drag down to Data Cursor to enabled the cursor for on screen display WINDAQ Lite Operating Modes WiNDAQ Lite waveform recording software has three operating modes They are in logical order of occurrence Setup Record and Standby Each operating mode shares many features with the other three but there are some features accessible only from one given mode The three modes are discussed in detail as follows The SET UP operating mode is active when WINDAQ Lite is first started SET UP is used to configure data acquisition parameters such as the number of acquired channels channel gain and channel offset In addition this
103. ers your TTL level signal or switch must be connected across the digital input pin O DIO and digital ground POWER GND across REMOTE EVENTS and POWER GND or across EVNT and POWER GND When properly connected event markers can be remotely triggered on the rising or falling edge of the trigger signal To generate an event marker on low to high transitions rising edge of the digital input Point to the Options menu and drag down to Remote Events To generate an event marker on high to low transitions falling edge of the digital input Point to the Options menu and drag down to Remote Events When the external event trigger feature is enabled an E will be displayed in the status bar immediately following the display mode descriptor as follows External event trigger enabled File Scaling Optii Mode Scrol Channels S s F3 Compress 5 000 cio po tc Event markers may be enabled either locally by choosing the appropriate command from the Edit menu or remotely through a switch closure or TTL signal When event markers are generated remotely it is not possible to enable them locally Nor are comments possible when recording with remotely triggered event markers REMOTE TRIGGERING OF DATA STORAGE TO DISK To remotely trigger data storage to disk your TTL level signal or switch must be connected across digital input pin 1 DI1 and digital ground POWER GND across REMOTE STOP
104. first be enabled for this option to work When enabled in the oscilloscope mode the current waveform data value at the cursor position is displayed in the annotation margin the cursor does not have to be enabled When enabled in the scroll mode the current waveform data value at the real time point far right screen edge is displayed in the annotation margin When disabled in either mode the base line value is displayed in the left right annotation margin if Data Display is enabled To enable current waveform data if disabled or disable it if enabled Point to the Options menu and drag down to Current Data When enabled the annotation margin will have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the Current Data command Data cursor vertical line Current waveform value at cursor position 5 1064 H 200 00 Current data enabled shown in oscilloscope mode Data Display Displays or hides the current waveform data value or the baseline value depending on the state of the Current Data option in the annotation margin If Limit Display is not enabled the engineering units will toggle on and off along with the value To display data if hidden or hide it if displayed Point to the Options menu and drag down to Data Display When the data display option is enabled the annotation margin w
105. g the User Annotation command DI 200 Acquisition a ile User annotation enabled ers Screen annotation options can be enabled in virtually any combination to provide the desired result However in some instances one option will override another For example if Data Display is disabled it is not possible to enable Current Data Similarly if Limit Display is disabled it is not possible to enable Current Data 18 m3 ToolBox When enabled a floating toolbox of buttons is displayed on your screen The toolbox buttons provide quick access to commonly used commands To display the toolbox Point to the View menu and drag down to ToolBox Each button on the ToolBox provides quick access a shortcut to commonly used functions as follows Open reference file Open close file Start stop recording Enable channels Channel setup Calibration Sample rate Waveform compression Commented event marker Trigger mode Oscilloscope mode Scroll mode Shift waveform down Shift waveform up Shrink waveform 2x Expand waveform 2x Change palette Show hide grid Open Reference File The same as choosing Open Reference File from the File menu Open Close File The same as choosing Open from the File menu or when a file is already open closes the file Start Stop Rec
106. g the waveform information being stored to disk Display format changes only affect the way you view waveforms on your computer s monitor Specifying a Sample Rate You must specify a sample throughput rate or total scanning rate for waveform recording For example if you wanted to acquire four channels of data all at 60 Hz you would require a sample rate of 240 Hz current sample rate samples per second v DI 170 Acquisition File Edit View caling Options Help D Channels 0 1 CE en 29 Compress F7 To specify a sample rate 1 Select the Sample Rate command Point to the Edit menu and drag down to Sample Rate This displays the sample rate dialog box as follows Sample Rate Input Buffer Size in KiloBytes 0 Disk Buffer Size in KiloBytes 20 2 Enter the desired throughput rate or total scanning rate in samples per second in the Sample Rate dialog box 3 Click OK or press the ENTER key WINDAQ Lite automatically allocates the correct amount of buffer space when you input a sample rate The Input Buffer Size and Disk Buffer Size values are displayed for informational purposes only Keep in mind that the sample rate is actually a throughput rate The sample rate per channel obtained by dividing the selected sample throughput rate by the number of channels enabled is displayed in the lower left corner of the window as S s CHAN DH 170 Acquisition File Edit View Scaling
107. ginning of the data file and 99 9 EOF indicates that the cursor position is at the end of the data file Point to the Options menu and drag down to EOF This will enable the distance to end of file function in the bottom annotation line if disabled or disable it if enabled When enabled a check mark V is displayed on the Options menu immediately preceding the EOF command When the distance to end of file function is disabled the check mark is removed WinDaa Waveform Browser Enable Live Display Displays the Time To Beginning Of File TBF format or one of the other three time marker related data formats in the live display field live display field enabled When enabled and the waveform is panned across the screen or the cursor is moved this display field is constantly updated to provide a live readout D Point to the Options menu and drag down to Enable Live Display This enables the live display field in the bottom annotation line if disabled or disables it if enabled When the live display field is enabled a check mark V is displayed on the Options menu immediately preceding the Enable Live Display command When the live display field is disabled the check mark is removed When the live display field is enabled the data displayed in this field is determined by the Select Live Display setting Refer to the SELECT LIVE DISPLAY function for more details When th
108. gle ended and differential definitions and various other scan list items Immediate mode access to digital I O and analog outputs Access to acquired data using either burst or streaming methods DatagSDK does not currently offer streaming DAC output The third ActiveX control DataqSerial may be used with all Dataq Instruments hardware that supports a serial COMM port interface including the DI 150 151 190 194 195 series devices Use 76 the DataqSDK control to access and manipulate all other Dataq Instruments hardware products like the DI 22x 4xx 5xx 7xx series devices DataqSerial features include Continuous access to acquire data Sample rate COMM port and acquired channel definitions Access to acquired data using streaming methods The fourth control DQChart is provided to allow basic charting capability from the VB samples included in the ActiveX installation DQChart offers the following features Plots up to 16 channels on the same chart Allows analog or digital plotting Displays color legends see below at the upper left corner of the chart Supports scaling and offsetting via mouse control Supports WinDaq compatible event marker Plots a specified channel from a data stream The final control Windaq can be used to eavesdrop on the data stream being acquired by WinDaq Data Acquisition software Use this control to return the single value or the latest
109. gr Units text box b For the case where the transducer output is unknown we would also enter 0 in the Low Cal Value text box with the test apparatus vented to atmospheric pressure ignore the Input Level text box WINDAQ Lite software has established the input voltage level for you and enter psi in the Engr Units text box Press the TAB key to position the insertion point in the various text boxes Type up to a four character optional engineering unit tag 1 e PSI f s rpm etc 4 Complete the low calibration entry as follows Click OK The Low Calibration dialog box disappears and if no high calibration has been done yet an offset is applied to the waveform to achieve the entered value But you are only half done the high calibration value must also be entered 5 Select High Calibration as follows Point to the Edit menu and drag down to High Calibration This displays the High Calibration dialog box E High Calibration Volt Input Level High Cal Value Engr Units Cancel 12 This is where you enter the high calibration data value that is to be assigned to the input voltage level For instance referring back to our previous examples a For the case where the transducer output is known we would enter 100 in the High Cal Value text box 4 5 in the Input Level text box and psi in the Engr Units text box b For the case where th
110. h A D data Any event marker comments that were provided ride with the data acquisition file as a trailer file Event markers may be enabled either locally manually through the keyboard or remotely through a switch closure or TTL signal Refer to the Remote Events Remote Events Remote Storage 1 Remote Storage 0 function for details related to remote triggering of event markers An event marker is automatically inserted in the data stream each time the RECORD operating mode is activated An event marker created in this manner is always tagged with a time and date stamp that allows any point in a recorded waveform file to be correlated with a precise date and time of occurrence to the nearest second Refer to Next Mark Previous Mark Insert Mark and Delete Mark in the WiNDAQ Waveform Browser playback and analysis software documentation for further information related to searching for event markers and using time and date stamp information 22 m8 oo Remote Events Remote Events Remote Storage 1 Remote Storage 0 This function allows you to remotely trigger event markers or data storage to disk through the digital input port labeled DIO and DI1 on DI 200 and DI 400 Series instruments REMOTE STOP START and REMOTE EVENTS on DI 500 Series instruments and R START STOP and EVNT on DI 720 and DI 730 instruments using a TTL level signal or switch REMOTE TRIGGERING OF EVENT MARKERS To remotely trigger event mark
111. he left of NEWAREA to exclude the internal traces which were included the first time the command was selected Amplitude Adjustments and Plot Scaling Scaling of the X Y plot automatically conforms to that of the associated Y T waveforms The X Y T channel scaled in mmHg will scale the X Y plot s X axis in mmHg Similarly the Y Y T channel scaled in ml will scale the X Y plot s Y axis in ml Beyond engineering units calibration WINDAQ Waveform Browser software allows changes in amplitude and offset to be applied to any Y T waveform As the X or Y channel of a Y T waveform is adjusted for scale and offset the X Y plot automatically adjusts This feature may be used to center an X Y plot on the screen by applying offset adjustments to the Y T waveforms or to bring off scale portions of X Y plots into view by applying scaling adjustments to the Y T waveforms 74 X Y Plot Grids Annotation and Hard Copy The Grid pattern and full scale annotation for the X Y plot assume the same state as that enabled for normal operation In addition the X Y display mode is supported by the print screen function allowing a hard copy of any display to be generated Using ActiveX Controls Before ActiveX controls programming was a complete chore Before you could run a program you had to write pages of code And as we well know if there is one mistake anywhere the rest of the code is useless This is why Activ
112. he signal 52 WinDaa Waveform Browser Compression Allows the waveform data file to be compressed a entirely onto one screen width or b to any given ratio To enable waveform compression 1 Point to the Edit menu and drag down to Compression When enabled the waveform compression dialog box is displayed on the screen Compression Compressed Data Display MID C MIN C MxMn 1 Maximum Cancel Compression Onto One Screen Width To achieve waveform data file compression so that the entire file is compressed onto one screen width Click the Maximum command button Conversely time compression can be disabled causing the data file to be uncompressed just as easily To disable time compression Click the 1 command button When the entire waveform data file is compressed the following features are also activated 1 The entire waveform data file fits within one screen width 2 The cursor will not automatically be displayed it must be manually enabled 3 The and cursor control keys are active allowing the cursor to be moved in a left or right direction across the waveform s 4 The cursor position at any given location on the screen will define the center of the screen when the screen is expanded by entering a lower compression factor 5 The fully compressed file display is saved in memory to allow fast reentry when moving between lower or uncompres
113. he time difference will be displayed as a negative value A time marker can be set with or without the cursor enabled however it is much easier to see what is transpiring with the data cursor on Since cursors for all channels align perfectly in time the time difference for events on channels other than that in window one may be measured even though the time marker itself is displayed only on window one s waveform You can display any waveform channel in window one allowing time measurements to be made on any channel When a time marker is placed directly over an event marker the time marker has priority and the event marker disappears Selecting Options Enable Time Marker a second time turns the time marker function off WiNDAQ Waveform Browser E Start Time End Time Cursor Time and Time per Division Four individual functions that when enabled provide a time reference for the waveform as follows 1 Start Time Displays the date and time the file was opened for acquisition 2 End Time Displays the date and time the file was closed for acquisition 3 Cursor Time Displays the date and time at the current cursor position 4 Time Division Displays the time per screen grid division Each of these three functions share the same display field the lower right corner of the bottom annotation line therefore only one of these functions can be displayed at a time To Display Start Time Point to th
114. ill have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the Data Display command File Edit View S Data display enabled ide Oscillos s F3 1010 ls Limit Display Displays or hides the upper and lower chart edge limits in the left right annotation margin If Data Display is disabled engineering units toggle on and off along with the limits To display upper and lower chart edge limits 1f hidden or hide them if displayed Point to the Options menu and drag down to Limit Display When the limit display option is enabled the annotation margin will have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the Limit Display command DI 200 Acquisition ile Ei gt le Se 11 Limit display enabled SS E s 0000 200 00 User Annotation Toggles the display of user annotation entered from the Edit menu User Annotation command in the waveform strip To display user annotation if hidden or hide it if displayed Point to the Options menu and drag down to User Annotation When user annotation is enabled the waveform strip wil display the specified channel s annotation entered with Edit User Annotation and a check mark V will be displayed on the Options menu immediately precedin
115. in the Channels field on the status bar The currently active list of enabled channels are displayed in this field immediately to the left of the cursor initially only channel 1 is enabled for recording currently enabled channels blinking block cursor DI 170 Acquisition Edit View Scaling Channels 0 1 Ch Compress F7 1 Sto File Mode Oscill Sis F3 122 07 2 Enter the desired channel number and press the ENTER key Repeat for each desired channel A single ended channel is added to the list by entering the channel s number and pressing the ENTER key A differential channel is added to the list by entering the channel s number followed by the letter D e g 3D and pressing the ENTER key This causes the channel number to be displayed in the enabled channels row 3 Disable channel configuration by pressing any key other than the letters D and T Note that a channel may be removed by typing the channel number preceded by a minus sign Make sure that you use the minus sign on the main keyboard not the minus sign that resides on the keypad the minus sign on the keypad performs an entirely different function For example typing 1 removes channel 1 from the row Note also that it is not possible to remove all the channels from the row in other words have no channels enabled For example say you are using the DI 195B and you have only chann
116. in the Top Limit text box and 0 in the Bottom Limit text box EIE Recording Waveforms to Disk The Record function on the File menu initiates recording to disk To begin waveform recording 1 Select the Record command Point to the File menu and drag down to Record This displays the Open dialog box Here is where you specify a file name to create a new file or open an existing file to append to it If creating a new file you will be prompted to specify a maximum file size If appending to an existing file you will be prompted to specify how much additional data to add to the existing file In either case you can specify file size in kilobytes or recording time In the case of recording time file size is based on the currently selected sample rate Note that you can experiment with different file sizes sample rates and recording time to get the desired result Move between the two text boxes with the TAB key 2 Enter the desired file size or accept the default 3 Close the dialog box and begin recording by clicking OK or pressing the ENTER key When you enter the desired file size or accept the default you are placed in the active record to disk operating mode where enabled analog channel data is simultaneously digitized displayed and streamed to disk The status field in the bottom annotation line indicates RECORD DI 170 Acquisition MARK WDQ File Edit View Scaling Options Help Mode
117. in this area just as a typical playback screen would When examining the X Y plot the analysis reporting area changes to display information about the X Y plot such as total area size delta information slope information etc X Y Plot Area The X Y plot area contains the actual X Y plot of the waveforms Examining the X Y plot is possible through use of a cross hair which may be moved anywhere on the plot Introduction to X Y Plot Analysis The X Y plot utility provides five analysis options that may be activated while an X Y plot is displayed These are the calculation of X Y plot excursions instantaneous rate of change 2 point rate of change linear regression rate of change and area bounded by curve The result of each analysis function is displayed directly on the X Y screen in the analysis reporting area as shown in the following figure 72 WINDAQ SAMPLE WDQ aC File Edit View Search Scaling form XY Options Help p VOLT Analysis reporting area peo ave d i ATA 3 058E I7 DELTA Y 1 862E 02 DELTA Y off EOF 600 96 This example displays X Y excursion data i30 0050 600 96 Text in the analysis reporting area will change depending upon the analysis option chosen The following examples appear in the analysis reporting area for each analysis option off EOF Normal X Y plot DATA 9 098E 02 DELTA
118. ing with the left mouse button to position the crosshair origin anywhere in the Y T plot area This independent movement of the cross hair has absolutely no waveform measurement utility but you will need this feature when you want to determine areas bounded by curves using the area fill function described later When making these measurements the cross hair origin is positioned anywhere within a confined region of the X Y plot before the area fill command is activated We will discuss this capability in greater detail in paragraphs to follow Dynamic X Y Plot Generation The use of the word dynamic here denotes that the Y T waveforms are scrolling on the screen and any X Y plots generated are those that result from the waveforms being scrolled through the region bounded by the limit cursors This mode of Operation generates a very dynamic X Y plot allowing large quantities of waveform information to be examined quickly in an X Y environment and within a defined span of time Like static X Y plotting dynamic X Y plot generation fully supports waveform compression To generate a dynamic X Y plot While pointing to the left or right scroll bar arrow in the analysis reporting area press and hold the left mouse button to scroll the waveform Analysis Reporting Area The analysis reporting area performs a dual role When manipulating the waveforms in the Y T area the analysis reporting area contains information about the waveforms
119. iously Signal cable meeting all four criteria for quality is Belden No 8641 Fast Start to Recording Waveforms with WINDAQ Lite After you have completed all hardware and software installations and connected your signals you are ready to record Steps 4 through 9 below outline the fast start procedure for recording waveforms to disk These are the basic steps you will take every time you record with WINDAQ Lite waveform recording software The rest of this chapter contains additional recording functions that will not necessarily be used in every session or are not requisite for recording but will make future recording sessions easier After your initial get acquainted recording session take a few moments and look over these functions EIN Enabling Channels for Acquisition It is assumed at this point that you have WINDAQ Lite waveform recording software running If not click the Start button on the taskbar point to Programs point to WINDAQ or whatever you named the group window during step 11 of the installation and click WinDaq Acq This step specifies which analog channels to record For example suppose we have analog signals connected to channels 1 and 2 and we want to record both of them Use this procedure to enable channels 1 and 2 for recording 1 To enable channel configuration KO Point to the Edit menu and drag down to Channels This causes the Ch block cursor to blink
120. is completed all channels in the original file will be exported rather than just the desired visible ones This function makes extensive use of the DISPLAY FORMAT and ASSIGN CHANNELS functions Literally whatever channels are displayed on the screen and the order in which they are displayed become the channels that are ported to the newly created file WiNDAQ Waveform Browser Free Lock Cursor This function applies mostly to those who are using the WINDAQ Waveform Browser without a mouse Allows the cursor to be released from its default position of screen center When released it may be positioned anywhere on the screen while the displayed waveforms remain stationary Pressing the SCROLL LOCK key will free the cursor and allow you to position it anywhere on the screen using the lt and gt cursor control keys When the cursor is in its free state and if your computer s keyboard provides an indicator light for SCROLL LOCK the light will be off The light will be on when the cursor is in its locked state The cursor state will toggle each time the SCROLL LOCK key is pressed The asterisk key may be used to center the cursor in the waveform display window If SCROLL LOCK is off when the key is pressed the cursor alone moves to screen center while waveforms remain stationary If SCROLL LOCK is on when the key is pressed cursor and waveforms scroll to screen center together mom Waveform Browser Jump To
121. is is useful when you wish to see phase information for a plot currently displaying magnitude and frequency information ASCII files are saved in the form of a three column spreadsheet preceded by a header The header contains the set up information used in the transform calculation including the filename of the waveform the assigned channel position in the file from which the FFT was taken compression applied to input the number of averaged points in the FFT window type used and the size of the FFT A portion of a sample file is shown as follows FILE sample dat CHANNEL 1 BF OF LEFT POINT 1 86080 BF OF CENTER POINT 1 912 BF OF RIGHT POINT 1 96300 SCREEN COMPRESSION 1 INPUT AVERAGING 1 WINDOW TYPE hanning FRO SMOOTHING FACTOR 1 POINTS 512 FRQ DB MAG 0 6 02 7 6294E 05 10 40 21 1 5640E 02 20 ILL 1 3899E 02 29 40 02 1 5302E 02 39 404 21 1 5631E 02 49 40 63 1 6023E 02 This header information may be used to completely reproduce the spectrum in another format if desired through WINDAQ Waveform Browser software An FFT may be reproduced as follows 1 With waveform compression equal to one position the cursor in the original file so that TBF in the bottom annotation line is equal to the TBF OF CENTER POINT value shown in the header 2 With SCROLL LOCK on position the cursor and waveform at screen center by pressing the gray asterisk
122. l user connections are made to the two four port screw terminal connectors DATAQ INSTRUMENTS NC 2 DI 19B REV A 1997 2228 oooo Belo T Pe C i m o ul ooo o0o00 g he E E CHANNEL 1 Os EX o So e e s CHI i o b Da E E i c Peg PA 0 0 o D6 N o uv ooo R a m o CHANNEL 2 5 a EX o R Rio Os o IN and IN are the signal input terminals for each channel EX and EX are excitation voltage outputs for those transducers that require excitation Obviously you ll want to tailor the DI 5B signal conditioning modules used in the instrument to the kind of input signals you wish to record Differential Inputs DI 195B features two dedicated differential input channels Differential input channels respond only to the difference in voltage between each and analog input effectively suppressing common mode voltages 1 e identical voltages appearing simultaneously and in phase on both inputs Since most forms of interference or noise are applied with equal intensity to both inputs of a differential amplifier that is in the common mode the differential amplifier is very effective at rejecting noise riding on a signal of interest Two types of signal sources are likely to be encountered wh
123. lay mode Point to the Options menu and drag down to Scroll Mode or Oscilloscope Mode Note that in either display mode the waveform display can be paused This allows you to get a stationary look at some point on the waveform While paused the Mode field in the status bar changes from the chosen display mode to Paused DH170 Acquisition MARK1 WDQ dit View Scaling Options Help Channels 0 1 Storage Compress FT 1 2 1 used sec DIV 2 Display paused indication Status STBY To enable disable the waveform display pause feature d Point to the Options menu and drag down to Pause Graphics When pause is enabled a subsequent pause attempt disables the paused waveform The display mode that was active before pausing is restored If the display is paused while in the Record operating mode data acquisition to disk continues unimpeded only the display is paused When Oscilloscope Mode is chosen from the Options menu the Oscilloscope Triggering dialog box is displayed as follows Oscilloscope Triggering e 1 887 Volt Channel Level E Free Run O Erase Bar Set Level Cancel This dialog box allows you to select one trigger channel and display the data in a triggered sweep oscilloscope format or in a free running oscilloscope format Checking the Free Run check box selects the free running oscilloscope format Leaving the Free Run check box unchecked se
124. layed ES amp WWB z Show Dynamic Range Allows you to see the waveform file with respect to the entire dynamic range of the A D converter Activating this function modifies the vertical scale and automatically adjusts the waveform so the and full scale counts are placed at the top and bottom of the waveform strip By seeing your waveform with respect to the entire dynamic range of the A D converter you see how much of this range you are using Ideally the waveform should use the entire dynamic range of the A D converter in order to take full advantage of its resolution To show the dynamic range of the A D converter Point to the Scaling menu and drag down to Show Dynamic Range This modifies the vertical scale and automatically adjusts the waveform to place the and full scale A D converter counts at the top and bottom of the waveform strip thus showing you the waveform file with respect to the entire dynamic range of the A D converter 27 Subsequent activations of the Show Dynamic Range command does nothing the function does not toggle To revert to the previous display prior to activating the Show Dynamic Range function use the Undo command on the Edit menu WiNDaorLite d WWB X Z5 Undo Allows you to reverse the last screen scaling or offset operation performed on a selected channel When undone the waveform will revert back to the original values before the previous scaling or offset ope
125. lects the triggered sweep oscilloscope format If free running is selected the waveform continuously updates on your monitor in a manner identical to an oscilloscope display and the rest of this dialog box can be ignored no triggering conditions need be set If triggered sweep is selected you can also set display trigger conditions such as channel level and slope that define the trigger or starting point for displaying the waveform on your monitor In this mode the waveform is not displayed until a trigger condition is detected When a trigger is detected a single sweep of the waveform will be displayed on your monitor and will remain on your monitor until the next trigger condition is detected 16 Slope option buttons The slope option buttons allow you to select the slope positive or negative at which the waveform display will trigger Selecting the option button triggers the display to start at the trigger level but on the waveform s rising slope Selecting the option button triggers the display to start at the trigger level but on the waveform s falling slope Channel text box Allows you to specify or select a channel for the trigger source Level field Indicates the current trigger level in volts Free Run check box Allows you to select between a triggered sweep oscilloscope display or a free running oscilloscope display see discussion above Note that this box must be unchecked to set the t
126. lp HELP is a complete online reference tool that you can use at any time to display a brief summary of WINDAQ Lite software contents When you finish reading the HELP information you are returned to the WiNDAQ Lite waveform display screen with everything exactly as you left it HELP information is displayed in its own window you can move and size the HELP window just as you would any other window When using WINDAQ Lite you can get help any time you want it You can request Help in a couple of different ways From the Help menu choose a Help category by D Pointing to the Help menu and dragging down to the desired menu item e Use the cursor control keys to highlight or select an item on a menu and then press F1 to get context sensitive help on the item While in Help you can move to other topics to find exactly the information you want including help on Help how to use Help If you are new to Help it is strongly recommended that you view Help Basics from the How to Use Help category When you finish using Help you can leave the Help window open but out of your way or you can close the Help window Because Help is an application that appears in its own window you can display the Help information next to the window in which you re working As you work you can switch to the Help window and find the Help information you need for a particular task To exit Help choose File Exit from the Help window If you wa
127. me per major division 23 time zoom factor 46 Time Division 52 Toggle Pane 57 trigger level indicator 19 Less Undo 30 User Annotation 20 53 User Annotation 22 User Palette 27 RU Valley on Screen 37 Visible channels only check box 35 40 W Waveform Down 1 Pixel 31 Waveform Down 10 Pixels 31 Waveform Up 1 Pixel 31 Waveform Up 10 Pixels 31 Windowed FFT 59 Windowed FFT 66
128. mode is used to adjust the real time display for a visually pleasing presentation Virtually all other data acquisition functions and adjustments are available from the SET UP operating mode including control of the real time display screen s scaling and offset functions In this mode only the real time display is active data is not yet being streamed or stored to disk In this mode sample rate is limited only by the capabilities of the hardware In other words you can sample as fast as your instrument will allow When in this mode the Status area of the bottom annotation line displays SET UP The RECORD operating mode is active when a file has been opened and the Record command has been selected from the File menu RECORD is used to stream waveform information to disk While in this mode all waveform recording features and functions are available with some restrictions except the following all channel specific operations i e channel number gain offset and sample rate adjustments In this mode waveform information is being continuously streamed to disk while the real time display remains active In this mode sample rate is limited to 240 Hz maximum throughput regardless of the instrument being used When in this mode the Status area of the bottom annotation line displays RECORD The STANDBY operating mode becomes active when waveform recording to disk is temporarily suspended by choosing the Stop command from the Fil
129. mpression channels enabled etc 21 MTS l nsert Mark Insert Commented Mark This function allows you to insert event markers either commented or uncommented at any point in the data stream going to disk Event markers along with appropriate comments can be used to mark an event or flag an uncommon occurrence in the data stream going to disk thus providing a complete record of what happened and why After the waveform recording session WINDAQ Waveform Browser playback software allows you to automatically search and move to the point in the data file where the event markers were placed during data acquisition A transition from the SET UP or STBY operating mode to the RECORD operating mode automatically inserts a positive going time and date stamped event marker in the data stream going to disk thus marking the start of acquisition You must be in the RECORD mode to insert additional event markers into the data going to disk While in the RECORD operating mode point to the Edit menu and drag down to Insert Mark for an uncommented event marker or Insert Commented Mark for a commented event marker A commented event marker allows you to enter up to a 39 character comment that will be associated with the event marker When Insert Commented Mark is chosen from the Edit menu the Event Marker Comment dialog box is displayed as follows E Event Marker Comment Event Comment Cancel Enter th
130. n is activated the desired plot area is filled and the analysis reporting area will display DATA 9 966E 00 NEVAREA 9 966E 00 TOTAREA off EOF Where the value to the left of NEWAREA is the area of the bounded curve just filled and the value to the left of TOTAREA is the accumulated result of all bounded and filled areas The latter quantity TOTAREA is possible since multiple area fills are possible for any given plot by repositioning the cross hair to a new area and filling again as described above ALT F3 is the quickest As consecutive areas of an X Y plot are filled TOTAREA accumulates a total while NEWAREA displays the area of the last fill Any given area may be unfilled by positioning the cursor within the filled area and pressing ALT F3 a second time When this feature is activated NEWAREA will display a negative number equal to the area eliminated and TOTAREA will decrease by an equal amount The value displayed for NEWAREA and TOTAREA is in units of channel X s units times Channel Y s units For example if channel X s Y T waveform is calibrated in units of PSI and channel Y s in units of Liters area is expressed in units of Liters PSI When using ALT F3 to fill areas it is possible for the screen to fill completely if the selected area was not completely bound If this happens pressing ALT F3 a second time without moving the cross hair will unfill th
131. n item is missing or damaged call Dataq Instruments at 330 668 1444 We will guide you through the appropriate steps for replacing missing or damaged items Save the original packing material in the unlikely event that your unit must for any reason be sent back to Dataq Instruments EN nstalling the Hardware NOTE Before installing WiNDAQ software you should already have the hardware installed or connected If you have not done so already install or connect your hardware at this time Use the following procedure to connect the DI 151RS or DI 195B module to your computer If you have an instrument other than the DI 151RS or DI 195B and you have not installed it yet do so now Ignore the following steps and proceed instead with the installation instructions contained in your hardware User s Manual DI 151RS and DI 195B Only 1 Connect the male end of the communications cable to the 9 pin female connector on the DI 151RS or DI 195B module 2 Connect the other end of the communications cable to your computer s serial or COM port 3 If you purchased the DI 195B plug the AC power adapter into any standard 120V 60Hz wall outlet EH Installing WiNDAG Software NOTE WINDAQ Lite waveform recording software and WINDAQ Waveform Browser playback and analysis software are both on the WINDAQ Resource CD but they must be installed individually with separate installation procedures
132. n the data file When the playback program is exited and a notepad file is typed to the screen or printed the columns seen are defined as follows Column 1 left most Time to beginning of file Column 2 Time marker Column 3 Channel zero data Column 4 Channel one data Column 5 Channel two data Column 6 Channel three data Data for all waveform channels time to beginning of file and time marker data are all written to the notepad file whenever the NOTEPAD function is invoked All data is written in scientific notation format The only exception to this rule is time marker data If a time marker was enabled at the time the NOTEPAD function was invoked time marker data will be annotated in scientific notation If the time marker WAS NOT enabled column two will contain nine zeros 000000000 indicating that the time marker was not enabled If the channel has been calibrated the data written to the notepad file will be in engineering units Channels that have not been calibrated will be written as raw analog voltages When NOTEPAD is activated with a compressed waveform display waveform values reported to the notepad file will be the minimum maximum or mid point value of the waveform s line segment that is coincident with the cursor depending on the state of the cursor mode Refer to the WAVEFORM COMPRESSION section for complete details All NOTEPAD files are directly compatible with spreadsheet ASYST and ASYSTANT softw
133. nds of a signal shield This causes current to flow through the shield and induces noise on the signal to be measured This problem is eliminated by ensuring that only one ground exists on the signal circuit RIGHT APPROACH y One ground on the signal circuit eliminates noise inducing ground loops instrument i input terminals signal source p i Qu l a Be differential A amplifier shield Potential difference 3 lt no path for current to circulate Isolated Signal Sources An isolated signal source is one that is not connected to ground at any point However the signal shield should still be grounded as before to reduce noise instrument Floating signal source input terminals signal i lead differential shield amplifier Any application requiring a differential amplifier also defines a need for quality signal cable Four elements combine to ensure adequate quality signal cable a twisted signal pair with low resistance stranded copper conductors surrounded by a multiple folded foil shield with a copper stranded drain wire all contained within an insulated outer jacket Drain wire Insulated outer jacket Foil shield Twisted signal pair Stranded copper conductors In applications where such signal cable is used a dramatic decrease in noise pickup will be experienced The drain wire should be considered as the shield and should be connected as described prev
134. nt Datas e EHE 17 Data Display ias A ANDRE EE NI E 17 Dammit Dd Pent nero edente t RR PEOR rre Rt 17 Miser Annotations tnc etest erret tente et esie tute ie PIE RE ree ee RE QE 17 VOOMBOK Jg PIE EE 18 User AMO ERR EE ODIT ER AIDE CO HE Heg ras Eee ius ERN aia 19 Compression 19 COmpression X2 intet eta ia M 19 COIIpression2 nucon RM UR DIRE HER UR EUM UE TO c LO rada 19 Time Base uenti tU RENDERE Reed enun 20 Beep on File Follando boi 20 enr p EcL 21 Save Default SCS lorca lirios Ded o ated eU REL TRUM PEEL ORE HERES 21 RSR ETa SEHE 21 Insert Commented Y Ea E nro E T 21 Remote Events En enna ii aaa din 22 Remote BEvents eU eR TE e URINAM idas E RR UM T ARTES cru 22 Remote 5torage eise c ett eee PEE OEIL QD ETE EEUU ica 22 Remote tora ndo oil 22 IPLE 23 Functions Common to Recording and Playback ecce eee ee eee ee eee eene eee ee eee eese ees sss ee LO COPY iine is rt RUE E E ERO Coe OTRO Fee Reo eet E RUE Gee ieee bed Gues Pee PRU HOS Ee Eee esa ns 24 Invert Sua dt ren rd E ES PEERS 24 Next Palette RN 24 User RT 24 Previous Palette 1 eer ae E E DIO B REN III ONIS EI debs aii a ia 24 Exil ones dos Og tedio taedio edet tae e CE vis 26 Gridseciicdxisusuudsiua nU iud aai mauu edd dv 26 Und ita iv das 27 IAE E A Rente t eet ee o ee eer re ett E 27 TOW ZA eI vei GU DI iE EE 28 Shrink AAA O te tn A 28 Waveform Down 1 Pixel titi TO RE EU e ER E AR EDO RE UR Re Eee Pede 2
135. nt to return to your work without closing Help you can shrink Help to an icon by clicking the Minimize button or by choosing Control Minimize Functions Common to Recording and Playback These functions appear in both WINDAQ Lite waveform recording software and WINDAQ Waveform Browser playback and analysis software packages and function identically in either WiNDaorLite 8 WWB Copy Copies the graphics in rectangle to the clipboard the graphic selection The Copy command on the Edit menu is dimmed until a graphic selection rectangle is drawn to enclose the desired graphics To copy graphics to the clipboard Position the mouse pointer anywhere in the graphics area 2 Drag with the RIGHT mouse button until the desired graphics have been enclosed With the graphics selection rectangle drawn the Copy command on the File menu is enabled and the enclosed graphics can be copied to the clipboard as follows Point to the Edit menu and drag down to Copy The graphic is copied to the clipboard in both bitmap and device independent bitmap DIB formats WiNDao Lite amp WWB Invert Allows you to flip the selected waveform upside down exchanging the top and bottom limits 24 To invert the waveform Point to the Scaling menu and drag down to Invert A subsequent activation of the Invert command flips the selected waveform back to its original orientation WinDAq Lite amp WWB Next Previous
136. nu Enter 100 in the High Cal Value text box enter psi in the Engr Units text box choose the OK command button and you re done To calibrate a waveform using this high low calibration method 1 Select the window that contains the desired waveform D Click the left mouse button in the unselected window s annotation margin File Edit View File Edit View File Edit View Mode Oscill Mode Oscill Mode Oscill B s F3 200 S s F3 200 S s F3 200 10 000 iU UUU 10 000 i 001 FO o01 B 001 1 0 Volt L 0 N Volt Volt 10 000 l nnn 10 000 unselected click selected window anywhere window to select 2 If not already enabled enable the Current Data and Data Display options on the Options menu 3 Select Low Calibration as follows Point to the Edit menu and drag down to Low Calibration This displays the Low Calibration dialog box Low Calibration Volt Input Level Low Cal Valuc Engr Units Cancel This is where you enter the low calibration data value that is to be assigned to the input voltage level For instance referring back to our previous examples a For the case where the transducer output is known 11 Input level Cal value Engr units 1 volt at 0 PSI 4 5 volts at 100 PSI we would enter 0 in the Low Cal Value text box 1 in the Input Level text box and psi in the En
137. ode from the Options menu choosing 19 MTS User Annotation Allows you to display a custom message up to 30 characters on the baseline of each display channel used in tandem with the User Annotation function on the Options menu The desired channel annotation must first be entered before it can be toggled on or off To enter channel annotation Point to the Edit menu and drag down to User Annotation This displays the Channel Annotation dialog box as follows Chose Anantasena vue mer tene A ve onm comas This dialog box prompts you to enter the desired channel annotation for the currently selected channel or any other channel If not the currently selected channel enter the desired channel number for which you want to provide annotation in the Channel text box In the Annotation text box enter the desired channel annotation up to 30 characters Once the channel annotation is entered the display of user annotation can be toggled on or off with the User Annotation command on the Options menu The Next and Previous buttons allow you to step through all of the enabled channels in order entering the desired channel annotation for each channel without closing this dialog box WINDAQ Lite Compression Compression x2 Compression 2 Allows you to vary the number of data points used to display the real time waveform on your computer screen current compression
138. ode Oscill Mode Oscill Mode Oscill B s F3 200 S s F3 200 S s F3 200 10 000 iu uuu 10 000 Pro 001 001 001 1 0 Volt 0 N Volt Volt io 000 l nnn 10 000 unselected click selected window anywhere window to select The waveform displayed in the selected window is now enabled for scale and offset adjustments D Expanding the Waveform s Amplitude Point to the Scaling menu and drag down to Grow 2X This expands the specified waveform two times its original size in the amplitude direction OR Point to the right or left annotation margin and click the left mouse button This also expands the specified waveform two times Contracting the Waveform s Amplitude Point to the Scaling menu and drag down to Shrink 2X This contracts the specified waveform one half its original size in the amplitude direction OR Point to the right or left annotation margin and click the right mouse button This also contracts the specified waveform one half its original size Moving the Waveform Down 1 Offsetting Point to the Scaling menu and drag down to Waveform Down 1 Pixel or Waveform Down 10 Pixels Waveform Down 1 Pixel moves the specified waveform down a single pixel in the strip and Waveform Down 10 Pixels moves the specified waveform down 10 pixels in the strip Moving the Waveform Up T Offsetting Point to the Scaling menu and drag down to Waveform Up 1 Pixel or Waveform Up 10 Pixels Waveform Up 1 Pix
139. ode Control Mid Min Max MxMn for compressed displays The waveform compression function operates by accumulating n number of waveform samples where n equals the compression ratio From these samples a min max line is then drawn or displayed where the end points of the line equal the absolute minimum and maximum values detected for the sample group When both the cursor and compression are enabled a dilemma exists regarding the appropriate value to report since multiple waveform segments have been compressed into one To a degree the cursor mode control solves this problem by allowing you to specify the value of a compressed line segment at cursor intersection as either its minimum maximum mid point or maximum and minimum quantity Compression allows you to choose between MID MIN MAX and both Maximum and Minimum MxMn line segment reporting To select the desired line segment reporting method 53 Ko 1 Click the desired option button either MID MIN MAX or MxMn 2 Click OK The currently active cursor mode is automatically reported at the bottom of the screen where the normal DATA annotation is replaced by MIN MAX MID or MxMn The default state is MID In the case of MxMn both maximum and minimum values are displayed in a blood pressure like format in the annotation margin This gives you an idea of the range of the data point values Wi nDaa Waveform Browser Data Cursor Allows annotation of waveform
140. of the data points in the burst sample and reports this average as the single value for storage and display Last Point Reports the last input data point in the burst sample ignoring the rest Maximum Reports the highest value data point in the burst sample ignoring the rest Minimum Reports the lowest value data point in the burst sample ignoring the rest Input Types Linear The default setting available on all instruments should be used with all linear inputs Thermocouple Selectable only on instruments with the hardware to support thermocouples Nonlinear Also only on instruments that support thermocouples Used only with a specialized non linear non thermocouple type of sensor Next and Previous Buttons Allow you to step through the next or previous enabled channel in order setting up each channel for gain unipolar bipolar sample rate etc without closing this dialog box Step 8 Calibrating Your Input Signals Calibration allows you to view and record your waveform data in significant engineering units Without calibrating waveform data is scaled annotated and displayed in volts which in many cases is not very meaningful Calibration is used to give meaning to the displayed data Instead of volts your data can be scaled annotated and displayed in significant engineering units i e PSI RPM lbs ft s etc This function allows your waveform data to be calibrated in signifi
141. ommand allows you to toggle between the pane in which the cursor control keys and numeric pad keys operate When the upper pane is active cursor control keys manipulate cursors in the upper pane the analysis reporting area contains TBF and TM data just as in a standard display When the lower pane is active cursor control keys manipulate the cross hairs on the power spectrum plot FRQ and DB or MAG data is displayed replacing the TBF and TM data Note that either pane can be selected more easily by clicking with the left mouse button in the desired pane To make the desired pane active if not already active thus allowing the cursor control keys to operate in that pane proceed as follows Point to the View menu and drag down to Toggle Pane 56 WiNDAQ Waveform Browser Fourier Transform Operations The Fourier Transform converts information in the time domain into the frequency domain It is an important analytical tool whenever it is necessary to determine the frequency components of a given time series waveform The thumbnail theory is that any periodic waveform may be represented by a series of sine wave functions at different amplitudes frequencies and phase shifts which when summed together for each time series increment will reproduce the original waveform Given an appropriate multi term sine function Fourier expansion for a time series waveform the magnitude of each term of the expansion may be plotted versus its
142. on the time marker and cursor accordingly taking care not to enclose one too many points when defining your cycle The recommended procedure is as follows Qua Exit the DFT mode and enter the Y T display mode by pointing to the View menu and dragging down to Exit Enter Split 2 Assign the waveform to be transformed to window 1 by pointing to the View menu and dragging down to Assign Channel then entering the desired channel number 3 Enter your desired compression factor by pointing to the Edit menu and dragging down to Compression Note that regardless of the range of waveform information to be transformed or the magnitude of the compression factor DFT software will always ensure that the number of points in the result does not exceed 8192 by multiplying the compression factor by the smallest integer necessary More on the effects of waveform compression follow shortly The selected compression factor however must be 1 to allow precise end point placement 4 Scroll the window to your first desired end point using the lt or cursor control keys 5 Place the time marker at the desired location by pressing the F4 key Make certain that the waveform cursor is enabled to allow precise placement of the time marker 6 Scroll the window until the waveform cursor is directly over the second desired end point 7 Perform the DFT over the selected range by pointing to the Transform menu and dragging down to
143. on anywhere in the bottom annotation line cesgopg CENE click anywhere in here If the data cursor is off this will turn it on at the point coincident with the mouse pointer If the data cursor is on a deliberate click of the left mouse button in the bottom annotation line at the point horizontally coincident with the data cursor turns it off Note when attempting to toggle the cursor on and off quickly clicking the left mouse button twice in rapid succession double clicking produces a much different result than turning the cursor on and off See the following function for more details on double clicking in the bottom annotation line Moving the Cursor to the Highest Peak 35 Point to the Search menu and drag down to Peak on Screen This moves the cursor to the highest waveform peak displayed on the screen in a selected channel OR Double click the left mouse button anywhere in the bottom annotation line This will also move the cursor to the highest peak displayed on the screen in a selected channel Moving the Cursor to the Lowest Valley Point to the Search menu and drag down to Valley on Screen This moves the cursor to the lowest waveform valley displayed on the screen in a selected channel OR Double click the right mouse button anywhere in the bottom annotation line This will also move the cursor to the lowest valley displayed on the screen in a selec
144. one that ranges from some negative value to some positive value is both positive and negative going If your signal is only a positive going waveform or a negative going waveform always select the Unipolar check box If your signal is both positive and negative going 10 leave the Unipolar box unchecked thus specifying bipolar Reset Cal Button Whenever the gain or unipolar bipolar setting is changed any calibration is preserved and adjusted to reflect the new gain or unipolar bipolar setting Selecting Reset Cal allows you to reset the selected channel from a significant engineering units calibration back to the default voltage or temperature if using thermocouples calibration Acquisition Method Allows you to select the method used for recording and displaying data intelligent oversampling All Dataq Instruments hardware products continuously sample data using a burst sampling technique The hardware samples data at one rate referred to as the burst rate while your computer reports i e displays and stores this data at another rate called the sample rate or throughput rate For example let s say we want to record one channel at 100 Hz and our burst rate is set at 50kHz This means that for every 500 data points sampled only 1 will be reported The dilemma becomes which data point out of the 500 gets reported Fortunately you have a choice for reporting this single data point Average Averages all
145. onnnnnononononnnnnnn nennen eene nene e nnne rennen ener e nenne 1 General Convention ii nai RR DR Dice DR 1 Mouse Conventions siii a iii 1 WINDAO Lit Operating Modest ii t Rr rea ea 2 Get ng aii Step 1 Installing the Ha rdwate 5 debe rU UP RR RE RITE ERRARE RR 3 Step 2 Installing WINDAQ SoftWare aeoieo es en a e Ea eS e EE S EEE E ie o E ES 3 Step 3 Connecting Your Input Signals to the InstrUMEI ooooonoocccnnonocccnononcncnoconnnnononnncnnnnnnononnn cnn nnnnannnnnnnnnns 4 Fast Start to Recording Waveforms with WINDAQ Lite eee e eee eene eee eee eee eee eese seeee 7 Step 4 Enabling Channels for Acquisition oooooccconccnonccononnconnnnnonaconnnnonnnonnnnononncnnnc nenne ener nennen nennen 7 Step 5 Viewing Enabled Channels coartada 8 Step 6 Specifying a SamplesRates o ui ld ven eb pr t eet ente 8 Step 7 Specifying Gain and Measurement Range eese nnne nnne nene nene nennen 9 Step 8 Calibrating Your Input Signals ononncnnoconinccnonconoonononnonorannononornrno nono nenne nere TEA E A E nete nennen 11 Step 9 Recording Waveforms to Diskin nineio eorn aerau eiee tu e ieoi retetei uredni sa tiai enoia 13 Additional Waveform Recording Functions ssscccssseessssoococceesesssoococceeessssoooocccesesssssococesesssssss LO BLOW A a E E aid 15 Nem PEE 15 Oscilloscope Mode 5 m1 ISP RR REO lo rere ete dextrae 15 Pause Graphic iii iaa 15 Open Reference Files cutis aaa 17 Curre
146. onversion waveform channel values are equivalent to A D converter counts integers To translate A D converter counts into a voltage perform the following operation from the ASYST or ASYSTANT level VOLTAGE Counts 8192 Volts full scale SPREADSHEET PRINT Allows you to paste waveform data to files that may be read directly by Lotus 1 2 3 Excel Quatro Pro or any spreadsheet program that uses the comma separated value CSV data format Even if your spreadsheet program uses something other than a comma to separate data values it is still possible to use this format Contact DATAQ INSTRUMENTS for details on changing the delimiter from a comma to whatever your program requires Selecting the Spreadsheet option from the format option list creates a data file that when read by Lotus 1 2 3 using their IMPORT command do not use Retrieve will present the data in spreadsheet fashion where each waveform channel fills one column i e column A contains waveform channel one s data column B waveform channel two s etc When the Spreadsheet format is invoked you are prompted to enter up to two optional comment lines that you may use to describe your particular test The aggregate sample rate is automatically entered as a comment The sample rate as well as any additional comments you provide will be printed on your spreadsheet when you import the data file to your spreadsheet program Some spreadsheet programs i e Excel
147. ording When activated with a data file already open recording starts immediately When activated without a data file open the Open dialog box appears prompting you to specify a new file name or select an existing file When activated during recording recording is stopped Enable Channels The Channels from the Edit menu same as choosing Channel Setup The same as choosing Channel Settings from the Edit menu Calibration The same as choosing Fixed Calibration from the Edit menu Sample Rate The same as choosing Sample Rate from the Edit menu Waveform Compression The same as choosing Compression from the Edit menu Commented Event Marker The same as choosing Insert Commented Mark from the Edit menu Show Hide Grid The same as choosing Grids from the Options menu Change Palette The same as choosing User Palette from the File menu Expand Waveform 2X The same as choosing Grow 2X from the Scaling menu Shrink Waveform 2X The same as choosing Shrink 2X from the Scaling menu Shift Waveform Up The same as choosing Waveform Up 10 Pixels from the Scaling menu Shift Waveform Down The same as choosing Waveform Down 10 Pixels from the Scaling menu Scroll Mode The same as choosing Scroll Mode from the Options menu Oscilloscope Mode The same as choosing Oscilloscope Mode from the Options menu Triggered Mode The same as Triggered M
148. ort import and otherwise manipulate the recorded waveform information It is available for download free of charge from our web site www dataq com Conventions Used in the Documentation Before you start using the DI 151RS DI 195B WINDAQ Lite or WINDAQ Waveform Browser software it s important to understand the terms and notational conventions used in this documentation General Conventions Commands you choose are given with the menu name preceding the command name For example the phrase Choose File Open tells you to choose the Open command from the File menu This naming convention describes the sequence you follow in choosing a command first you select the menu then you choose the command Mouse Conventions In general most mouse actions require only the left mouse button For example carrying out a menu command or working in a dialog box requires only the left mouse button However the right mouse button is not totally neglected Among other things the right mouse button is used for copying waveform data to the clipboard waveform scaling selecting a waveform channel etc Since the majority of mouse procedures are done with the left mouse button we will not specify which mouse button to click drag or double click with in the procedures unless it is the RIGHT mouse button When the right mouse button is required it will be specified as such For example Double click the right mouse button anywh
149. osition Dragging anywhere in the left 60 magnitude scale margin with the left mouse button held down allows you to drag the horizontal cross hair anywhere on the plot and simultaneously update the decibel or magnitude value in the analysis reporting area After releasing the left button SHIFT F4 will rescale the power spectrum plot to place the horizontal crosshair at the top of the FFT plot area and use it as the OdB reference This rescale can be undone by dragging the left mouse button in the left magnitude scale margin to position the horizontal cross hair at the very bottom of the FFT plot area then by pressing SHIFT F4 again Grid lines and axis annotation are also available to aid waveform analysis Grid lines can be toggled on and off in the same manner as described in the Grids section When displayed the X axis of the plot represents the frequency axis of the power spectrum with the scale displayed at the bottom of the screen The Y axis represents the magnitude axis of the power spectrum with the scale displayed at the left edge of the screen The magnitude axis Y axis is always displayed when a transform is performed however the frequency axis X axis can be toggled on and off by selecting the Limit amp Frequency Display command from the Options menu WINDAQ EMG DAT View Search Scaling Transform Options Help Magnitude Scale 41 27 34 88 E 22 11 15
150. ot Window Excluding Title and Menu Bars Prints only the most pertinent information about the waveform file s displayed on the screen Does not print the title or menu bar at the top of the display Note that when either of these formats are selected the Continuous Print Options are dimmed thus not selectable However the Window Print Options are selectable These options control the size of the print screen The two size options are as follows Best Fit Maintains the aspect ratio of the display on the screen The size of the printout fills the page as much as possible without destroying the aspect ratio Stretch to Page Fills the entire page with the printout With the paper portrait oriented the printed image is stretched in the vertical direction to fill the entire page thus not maintaining the aspect ratio of the display on the screen The following illustrates a typical waveform printed on an 8 x 11 inch sheet of paper in each format and size option Best Fit Option Stretch to Page Option Ple eo ir ewes Ses o Hei s Hie t fer Search Sealing Deer Help Entire Window Window Excluding mid ree ATA Title and Menu Bars aa A En FAES o Graphic Selection Rectangle Feature To generate a hard copy of only the waveform s bounded by the graphic selection rectangle you must first draw the graphic selection rectangle to enable
151. oth methods produce exactly the same result and are presented as follows Static X Y Plot Generation The use of the word static here denotes that the Y T waveforms are stable on the screen not scrolling and any X Y plots generated are those that result from adjusting the limit cursors and the data cursor for the cross hair As the limit cursors are moved on the screen the X Y plot will update to reflect a plot of only the region of Y T waveform information isolated between the limit cursors Movement of the data cursor as described allows the origin of the cross hair to trace the X Y plot The origin of the cross hair at any given point on the X Y plot correlates exactly with the location of the data cursor on the Y T plot Static X Y plotting fully supports the waveform compression features of WINDAQ Waveform Browser software This allows you to compress entire files so they can be displayed on the screen in their entirety Then the left limit cursor may be moved to the left edge of the screen and the right limit cursor to the right edge of the screen to produce an X Y plot of one entire waveform file versus another entire waveform file When waveform compression of any degree is active the representative X Y plot may be a function of minimum maximum or mid point compressed Y T values While in the static X Y plotting mode it is possible to move the cross hair independently of the data cursor This is done as follows Dragg
152. ovided by the record File Information Original CODAS formatted data file name and the date and time the file was acquired Your comments if any are shown as entered when the hard copy was enabled Waveform Information Describes the full scale and base line values in whatever engineering unit was selected for each waveform If engineering units were not enabled the units displayed will be volts Any waveform scales offsets or calibrations applied while using Playback will be similarly duplicated in the hard copy record When interpreting the hard copy record the full scale limit is the top most horizontal grid line be sure to orient hard copy record with reference arrow pointing up the full scale limit is at the bottom most horizontal grid line and mid scale limit is the horizontal grid line in the middle Also annotated is the Waveform Compression Factor selected at the time the hard copy was enabled This factor is provided for reference only since all time functions are automatically adjusted as a function of the compression factor Time Annotation The hard copy produces two types of time annotation Time referenced to the beginning of the hard copy record TBR and time referenced to the beginning of the parent data acquisition file TBF The hard copy record yields a time division marker approximately every lcm Each such marker is annotated on the right and left chart edge with TBR and TBF in seconds re
153. own to Compression x2 To divide the current compression factor by 2 Point to the Edit menu and drag down to Compression 2 Perhaps these two functions are most useful when the accelerator keys PGUP for Compression x2 and PGDN for Compression 2 are used This allows you to press one key several times in succession to find just the right amount of compression for a smooth scrolling visually pleasing display As the waveform compression factor is changed the time base field ms DIV or sec DIV displayed in the bottom annotation line is automatically adjusted to reflect the proper time scaling of displayed waveforms m3 Time Base Displays the time per major division at the bottom of the real time screen as sec DIV or ms DIV The displayed value is a function of the selected sample rate the number of channels enabled and the selected waveform compression factor DI 200 Acquisition li File Edit View Scaling Options Help Mode Oscilloscope Channels 0 1 2 3 S s F3 1000 Compress F7 1 2 9570 E EE ES Storage used Franmes s 18 18 is T 200 00 1 8530 fest 00 a vs 200 00 42 9570 is i i 543 CHAN 250 ns DIV 80 0 Status SET UP Time per major division Time per major division is displayed at all times in all operating modes A Beep on File Full When enabled this option sounds an audible beep
154. plotted the Y axis can be re scaled to aid spectrum analysis Activating Y axis scaling causes the selected Y level to be plotted at the top of the screen and the rest of the plot to be re scaled accordingly The dB values will also be re scaled using the top of the screen as the O dB reference with decreasing values displayed as the bottom of the screen is approached With a power spectrum displayed the Y axis can be re scaled relative to the position of the horizontal cross hair as follows 1 Adjust the horizontal cross hair to the desired reference level by dragging with the left mouse button in the left annotation margin of the bottom pane or transform plot area 2 Re scale the spectrum plot relative to the horizontal cross hair by pointing to the Transform menu and dragging down to Scale DB If the results obtained from this re scaling operation are unsatisfactory the default Y axis scale can be restored by positioning the cross hair at the extreme bottom of the screen and repeating step 2 in effect re scaling with the cross hair positioned at the 66 extreme bottom of the screen CHANGING POWER SPECTRUM AMPLITUDE UNITS The strength of the frequency component can be displayed in either engineering units or relative magnitude in the form of decibels dB The default scale of decibels db assuming the scale has not been changed by adjusting Y axis scaling as described above is derived from the following equa
155. ports only regular WinDag files i e no support for different channels sampled at different rates No commented event marker support No user annotation support ReadDataqFile can be used to read WinDaq compatible files In many instances you may wish access to data acquired by WinDaq data acquisition software Examples include custom analysis and export requirements This control provides a convenient way to perform these special operations Some of the features of ReadDataqFile Open and close file manipulation capability File navigation utilities It also has the following limitations Supports only regular WinDag files i e no support for different channels sampled at different rates No commented event marker support No user annotation support The second ActiveX control DataqSDK provides access to the most basic elements of data acquisition hardware In contrast the WinDaq control relieves you of general data acquisition housekeeping and delivers scaled waveform data to your application DataqSDK may be used with all Dataq Instruments hardware including the DI 22x Axx 5xx 7xx series devices Use the DataqSerial control to access and manipulate Dataq Instruments serial Dataq Instruments data acquisition modules like the DI 194 and DI 151RS Features of DataqSDK include Data acquisition mode definitions for continuous and triggered data acquisition Sample rate channel sin
156. r scheme is saved as one of the 16 display choices and the original color combinations are overwritten To change a palettes color scheme 1 Using the technique described above display the palette you want to change 2 Point to the View menu and drag down to User Palette This displays the Palette dialog box 3 In the Palette dialog box click the Background Grid Lines and User Annotation 1st Waveform or 2nd Waveform colors you want A dotted box appears around the selected color sample 4 Click Apply to apply the colors you have selected 5 If you are satisfied with the color scheme you have selected click OK This saves the newly defined color scheme as one of the 16 display palettes overwriting the existing palette If you are not satisfied repeat steps 3 and 4 above or click Cancel to get back to the original palette you started with User Palette Dialog Box The following information can be referred to when using the User Palette function User Palette Decrement Palette N Background Grid Lines and User Annotation 2nd Waveform 1st Waveform Palette Serves as a label or identifier for the selected color scheme Range is from 0 to 15 Increment command button Displays the color scheme that defines the next palette Activating this button increments the Palette and upda
157. ration Note that this feature only works on the same channel as the most recent scaling or offset operation Subsequent undo operations toggles between the previous and most recent versions of screen scaling or offset A scaling or offset operation must first be performed on a selected channel to make the Undo command selectable undimmed Once Undo becomes selectable you can perform any other operation except another scaling or offset operation on any other channel and still have the capability to come back to the selected channel and undo the last screen scaling or offset operation After scaling or offsetting a waveform reverse the operation as follows Point to the Edit menu and drag down to Undo WinDaa Lite ARAS a WWB Assign Channel Allows any enabled channel to be assigned to any display window WINDAQ Lite supports up to 16 waveform channels which can be displayed in any of the 16 waveform display windows In some cases any two waveforms may be displayed in an overlapping format within the same window The two element equality X Y displayed for every enabled channel is called the variable waveform assignment indicator This indicator shows which channel is assigned to which window The first element is the window number The second element is the analog channel assigned to that window window number analog channel assigned to this window File Edit B View Si Mode S s F3 5 0
158. recorded to disk This is why we need a new value called effective sample rate It takes into account the original sample rate the number of enabled channels and the sample rate divisor of all enabled channels Full effective sample rate details can be found in the WINDAQ Pro and WINDAQ Pro User s Manual Acquisition method Displays the method chosen for displaying data on your monitor and recording it to disk Valid displays are Average Last Point Maximum or Minimum Input type Displays the type of transducer originally used on this channel to record the data Valid displays are Linear Thermocouple and Nonlinear Complete details of each input type can be found in the WINDAQ Pro and WINDAQ Pro User s Manual Gain Displays the gain chosen for this channel prior to recording Gain varies with the instruments being used Input level top Displays the input level at the top of the A D converter s range This value will be a voltage either 5 00 or 10 00 volts if the channel was truly used for recording or it will be expressed 3l as a percentage of full scale 100 00 if this is a calculated channel created by Advanced CODAS Analysis Software Input units Displays volts if the channel was used for recording or displays FS percent full scale if the channel is a calculated channel created by Advanced CODAS Analysis Software Input level bottom Displays the input level at the bottom of the A D
159. rently active data file the Open dialog box will appear prompting you for the new file name Supply the name of the data file you wish to review including path if necessary WINDAQ Waveform Browser E nable Time Marker The time marker is used to define one end of a range of waveform information the data cursor is used as the other end When a range of waveform is defined the data lying between the time marker and cursor can be reported in one of four selectable time related formats To set a time marker 1 Position the cursor by using the mouse in the bottom annotation line or by using the left and right arrow keys at a point on the waveform in window 1 where the time marker is to be placed AQ AR Q via File Edit View Search Scaling Transform XY Options Help move cursor by dragging left mouse button here N lt 9 B H 25 0000 idad i foie bebe bebe DATA off SEC TBF off SEC TM off SEOF gt
160. require the newly created CSV file to contain a CSV extension in the file name DEFERRED HARD COPY Use this data storage format to create a print file or several print files that can be invoked and printed even batch processed at a later time from DOS with the AT CODAS hard copy utility HCU EXE The target printer and port are those specified during CODAS configuration WINDAQ Waveform Browser users can also use the hard copy utility HCU provided they have a Laserjet Thinkjet or IBM compatible dot matrix graphics printer that CODAS supports In this case the hard copy utility HCU EXE will be automatically installed at the time of WINDAQ Waveform Browser installation contact DATAQ Instruments technical support for details After selecting this data storage format you will be prompted to enter a comment You may enter a line of comments up to 70 characters that will be passed to the hard copy record DADISP Selecting the DADISP file format will create a data file that may be directly imported into the DADiSP waveform analysis program The file format is that defined by DSP Systems where a data file header describing the format of the data is first created and the data format is floating point binary CALC When the CALC option in the format 34 selection menu is selected the following events automatically take place 1 A new data file is created on disk carrying the file name you supplied when EXPORT
161. ri32 OLE Control module bpectl 1 0 Type Library br549 OLE Control module CAWINDOWSISYSTEMYTDC OCX Cdlg CSSEdP d2hframe 1 0 Type Library DATAQ Instruments DatagFile Control DATAQ Instruments DatagSdk Control DATAQ Instruments DatagSerial Control DATAQ Instruments DQChart Control DATAQ Instruments WinDaq Control a III uDIDb bb You will see the ActiveX control symbols on your tool bar To apply one to your form simply double click on the symbol To access a help file select the control or select a specific property method or event and press Fl The first ActiveX control DataqFile has two parts to it WriteDataqFile and ReadDatagFile WriteDataqFile can be used to create a WinDaq compatible file Although your data acquisition program may not use WinDaq software it may still be beneficial to allow the data files your program acquires to be accessed displayed and manipulated using WinDaq waveform browser software This control ensures that the files created by your program may be used in this manner Some of the features of WriteDatagFile are File manipulation utilities that allow controlled access to data File manipulation utilities that allow controlled access to data Full scale definitions per channel in engineering units Sample rate throughput definition that is used by WinDaq browser software for all timing measurements WriteDataqFile has the following limitations Sup
162. rigger level Erase Bar check box Allows you to enable disable the display of the vertical erase bar cursor on the waveform Whether the erase bar is displayed or disabled the waveform information on screen is still erased and replaced with a fresh sweep of data OK command button Closes the Oscilloscope Triggering dialog box and applies the just configured display trigger conditions Set Level command button Allows you to adjust or set the trigger level Note that the Free Run check box must be unchecked to set a trigger level When this button is selected the Oscilloscope Triggering dialog box closes and causes the cursor to point to a short horizontal line at the right side of the annotation margin This short horizontal line is the trigger level indicator File Edit View Scalim Oscill 5 000 S s CHAN 1000 At this point mouse movement is limited to dragging the line up or down to the desired trigger level Note that when the mouse is moved the data Trigger level indicator display in the left annotation margin changes to indicate trigger level When set where desired clicking the left mouse button sets a new trigger level while clicking the right mouse button retains the existing level Note that if the trigger level is set somewhere above or below the current signal the signal will disappear from the display Cancel command button Closes the Oscilloscope Triggering dialog box
163. rip will have the following appearance and a check mark V will be displayed on the Options menu immediately preceding the User Annotation command WINDAQ X DAT File Edit View Search Scaling Options Help User annotation m a enabled nnote tion H i User annotation User Annotation Allows you to edit or change the channel annotation that was provided during waveform recording It is not necessary to enable the display of channel annotation in order to use this function but you will not see the results of your editing session unless user channel annotation is enabled for display by pressing ALT U To edit user channel annotation Point to the Edit menu and drag down to User Annotation This displays the Channel Annotation dialog box as follows Channel Annotation Ix Chan Annotation Allthe m E channels in E nera Pressure the data file Pero Select an with their annotation for current user editing from annotation this list Annotation and edit it here ine Wave OK Cancel The top portion of the Channel Annotation dialog box displays all the channels in the data file along with their current user annotation To edit a channel s annotation highlight click on the annotation in the list at the top of the window and perform the editing in the Annotation box at the bottom of the
164. rm information to be transformed The location of the time marker on a waveform represents one limit of the transform and the location of the waveform cursor the other limit Since the time marker need not be displayed on the screen to remain active large transforms are possible at low compression factors Transforms up to 8192 points are possible at a compression factor of 1 allowing precise placement of end points without the indecision of marker placement at compression factors greater than 1 This approach however does support compression factors greater than 1 adding more flexibility to its use Time marker and cursor placement on the waveform to be transformed may occur from either the Y T or DFT modes of operation Since the object of using the time marker approach to end point definition is precision it is recommended that the time marker and cursor positions be defined from the Y T mode using display format 1 to allow full screen resolution during the placement process Just as with the limit cursor approach the time marker and cursor should be adjusted to enclose an integer or whole number of cycles on the waveform to be transformed This is best accomplished by picking a spot on the waveform where the slope is steep and a single points value is well defined like near the midpoint of a waveform Also keep in mind that the DFT is generated over the range including those points occupied by the time marker and cursor So positi
165. s displayed as follows Frequency File Type DB AG COSINE SINE HAG HAG RADIANS DEGREES From this dialog box you can specify the type of frequency information to be saved as an ASCII file The transform plot information is saved as an ASCII file in the form of a three column spreadsheet These three columns contain the information necessary to reproduce the spectrum four different ways in any spreadsheet program or in any program that is capable of importing ASCII files The FRQ DB MAG selection will reproduce the spectrum showing magnitude and frequency information exactly as displayed in the plot area of WINDAQ Waveform Browser The FRQ COSINE SINE selection will reproduce the spectrum in a rectangular coordinates format showing phase information with the cosine value representing the real component and the sine value representing the imaginary component The FRQ MAG RADIANS selection will reproduce the spectrum in a polar coordinates format showing the vector angle in radians The FRQ MAG DEGREES selection will also reproduce the spectrum in polar coordinates format but with the vector angle in degrees When the desired file type is highlighted and the OK command button is activated the transform plot is exported to an ASCII file The display will return to the power spectrum plot and analysis can be resumed 67 It is possible to reproduce the spectrum with WINDAQ Waveform Browser software Th
166. sed and the full file compressed formats When time compression is disabled the compression ratio displayed in the Compression text box reverts to a value of 1 Compression to Any Given Ratio The value displayed in the Compression text box is the selected waveform compression ratio This ratio can range from 1 time compression disabled to whatever value is required to compress the entire file on the screen When the compression dialog box is first displayed a blinking vertical line called the insertion point appears behind the compression factor in the Compression text box This insertion point indicates the active area of the dialog box the next action you perform will occur in this area To increase or decrease the compression ratio make sure the insertion point is in the Compression text box then simply enter the new compression ratio If you choose a compression value that is too large an Invalid Compression message box will appear Click OK or press ENTER to clear the message box and try a smaller compression value Entering a compression ratio of 1 disables time compression resulting in an uncompressed data file The Compression ratio displayed in the Compression dialog box is the number of data points for each enabled channel that are evaluated for a min max value For example if the compression ratio equals twenty then twenty data points are evaluated to plot a min max line Cursor M
167. sing Channel Settings from the Edit menu Playback channel Displays the channel you are currently viewing the settings for Acquisition channel Displays the physical channel number that was used during recording If None is displayed it means this channel was never recorded but instead is a calculated channel created by Advanced CODAS Analysis Software available as an extra cost option Sample rate Hz Displays the sample rate in Hz that was used to record this channel Sample rate divisor Displays the sample rate divisor that was used for this channel to achieve a specific sample rate Note that if the file was recorded with WINDAQ Lite or WINDAQ Pro waveform recording software this divisor will always be 1 If the channel was recorded with WINDAQ Pro waveform recording software this divisor can range from to 255 indicating the factor that was used to divide the per channel sample rate down to a desired value Effective sample rate Hz Displays the channels effective sample rate When the sample rate divisor is 1 the effective sample rate is the same as the sample rate When a sample rate divisor other than 1 is used the effective sample rate describes the rate at which data was recorded to disk When a sample rate divisor other than 1 is used on a channel the sample rate still accurately describes the rate at which data gets sampled but does not accurately describe the rate at which data was
168. sired DFT generation may be used All the functions available for FFT generation such as scaling averaging and smoothing are also available for DFT generation with the exception of windowing When using DFT s the need for a windowing function is replaced by the ability to adjust the end points that define the time series range as discussed earlier in the FOURIER TRANSFORM BASICS section above With the DFT there are two ways to define the range of the time series to be transformed One method allows you to adjust right and left limit cursors so the desired length of time series is enclosed within these limit cursors This approach allows you to see on window 1 in the Y T display area precisely what you are transforming The other method allows you to use the time marker and cursor to specify the DFT range The location of the time marker on a waveform represents one limit of the transform while the location of the waveform cursor represents the other limit This approach does not require that the full range of waveform information to be transformed be viewed on the screen at once When a DFT is performed the analysis reporting area is changed to reflect the lack of windowing as shown below DATA 6 40 Hz X1 99 34 DB hn off EOF Window designator indicates an FFT DATA 15 Hz Xi 33 34 DB Ci 0 8 EOF C denotes time marker and Cursor approach DFT DATA 13 3 Hz X1 50 64 DB E0
169. sor in either direction to the other end of the desired range by dragging the left mouse button in the bottom annotation margin WINDAG MARKI WDQ File Edit View Search Scaling Transform XY Options Help of cd and eL cursor positioned gt 5 0860 fees at other end of y desired range indicates length i 22 in seconds of eto move cursor by dragging left mouse Y button here Although the range is specified only on display window one when hard copied data for all channels lying within the range is hard copied Note that each waveform channel should be scaled offset calibrated and compressed on the screen display exactly the way you would like it to appear when hard copied Also note that grid lines will be printed if enabled for display When the hard copy ranges are selected as described above the continuous hard copy feature is invoked by Pointing to the File menu and dragging down to Print This displays the Print dialog box Select the Continuous From Cursor to Time Marker TM option button in order to generate a continuous hard copy Data to Print O Entire Window O Window Excluding Title and Menu Bars O Graphic Selection Rectangle e Continuous From Cursor to Time Marker TM Window Print Options O Sreich to Page Continuous Print Options O TBE on left O TBR on right Time zoom factor n Note that when the Continuous From Cursor
170. spectively The need for TBR is obvious This annotation allows any waveform event to be placed in time relative to the beginning of the hard copy record The need for TBF is more subtle but just as important Playback provides a TBF Time To Beginning Of File function which allows the current position of a waveform cursor to be known relative to the time in seconds from the beginning of the file being reviewed TBF annotation provided by the hard copy directly correlates with Playback software s TBF function This means that a waveform event occurring on the hard copy record can be similarly located on the computer based record by scrolling the waveforms forward or backward until TBF equals that observed in the hard copy record Correlation of a hard copy record with its computer based parent is a valuable feature especially when coupled with Waveform Compression Large portions or even an entire data file may be compressed hard copied then used as a tool for determining where detailed analysis should begin and end In this manner the feature allows you to get a handle on large quantities of data in a purely logical and organized fashion PLAYBACK HARD COPY DATA DATA FILE TEST DAT 11 7 87 12 05 30 COMMENT This is a test of HCU software COMPRESSION 1 Channel Full Scale Baseline Full Scale Unit User Annotation 6 5 0000 0000 5 0000 Volt 0123456789ABCDEFGHIJKLMNO TBF TBR 40 3286 0000
171. splay with this format If the cursor is positioned directly on top of the time marker and compression is 1 the live display field indicates on because the function is undefined If waveform compression is enabled the data values reported by the time marker and cursor will be MID MIN or MAX line segment values rather than a single data point value that would be displayed on an uncompressed waveform Each of these display formats report waveform information for the currently selected channel If no channel is selected the live display field shows Time from Beginning of File WinDaag Waveform Browser Select Marker Display Allows you to select between four different time formats for display in the marker display field These formats report the data lying between the time marker and cursor as time from marker samples from marker Hz for cycle to marker and cycles minute for cycle to marker Time From Marker Annotates the time difference from the cursor to the time marker in seconds To display time from marker in the marker display field O 1 Point to the Options menu and drag down to Select Marker Display 2 Click on Time from Marker When selected the marker display field will show XXXX SEC TM where XXXX is the time difference from the cursor to the time marker in seconds Time marker Cursor 02891 i i i 03784 Volt Time from Marker format enabled 0720 SEC TH 28
172. st Statistics may be reported for the entire length of the waveform channel or any section of the channel by isolating the area of interest between the time marker and cursor A time marker is enabled by positioning the cursor at the desired location and pressing the F4 function key Statistics may be reported for the area of the enabled waveform window isolated between the time marker and cursor by the following procedure Point to the View menu and drag down to Statistics Following this procedure the screen will clear and the following window will be displayed UNITS Volt CHANNEL 1 f OF POINTS 346 MEAN 1 3267E 01 STD DEVIATION 2 8050 00 MINIMUM 3 9941 E 00 MEDIAN 2 5733E 01 MALO MILI 4 047 9E 00 RMS 2 0849 00 SUM 4 5 7 4E 01 SUM OF SQUARES 2 7222E 03 VARIANCE 7 0720 00 SKEWNESS 1 437 BE 01 SLOPE 1 1172 00 AREA 1 8330E 01 STAAT POINT TBF 212 END POINT THF 1 592 FILE CADATAQNSAMPLE WDO Open New File Te Chipboard Cancel The Write to File and Open New File command buttons are used for sending the reported information to a disk file The Write to File button originally appears dimmed because a file name has not yet been specified To specify a filename you must first activate the Open New File command button When activated you will be prompted to enter a file name and path on the Open Statistics File dialog box Open Statistics File Filename E
173. stores one file per channel and the last two digits of the filename indicate the channel number i e 01 is channel one 02 is channel two 10 is channel 10 etc Statistical information is also included in the data file when this storage format is selected PASTING DATA IN COMPRESSED FORMAT Since the waveforms displayed by playback software may be compressed at the time the EXPORT utility is invoked it is possible to paste compressed data If waveform compression was enabled at the time EXPORT is used and the SPREADSHEET or ASYST ANT storage format is selected the sample rate figure automatically added to the comment lines will be divided by the compression ratio that was active at the time the export function was selected If the DADISP storage format is selected the time axis of DADISP windows will be automatically adjusted WiNDAQ Waveform Browser Data Cursor Peak on Screen Valley on Screen and Center Cursor Used to turn the waveform data cursor on or off and to control cursor movement on the screen Including moving the cursor to the highest peak displayed onscreen for the selected channel moving the cursor to the lowest valley displayed onscreen for the selected channel and moving the cursor to the center of the screen Turning the Data Cursor On Off Point to the Options menu and drag down to Data Cursor This will turn the data cursor on if it is off or off if it is on OR Click the left mouse butt
174. t When WINDAQ Lite software has successfully been installed double click the My Computer icon on your desktop and then double click your CD ROM icon to manually display the list of installation options Again choose the Install Software button and click OK Select the WINDAQ Waveform Browser button and click OK to install WINDAQ Waveform Browser playback and analysis software The on screen prompts should provide enough information to successfully get you through the installation However if you need additional information contact Dataq Instruments technical support Connecting Your Input Signals to the Instrument NOTE Use the following procedure to connect your input signals to the DI 151RS or DI 195B module If you have an instrument other than the DI 151RS or DI 195B ignore the following steps and proceed instead with the input signal connection instructions contained in your hardware User s Manual To connect signals to the DI 151RS or DI 195B insert the stripped end of a signal lead into the desired terminal directly under the screw Tighten the pressure flap by rotating the screw clockwise with a small screwdriver Make sure that the pressure flap tightens only against the signal wire and not the wire insulation Do not overtighten Tug gently on the signal lead to ensure that it is firmly secured DI 151RS All user connections are made to the 8 port screw terminal connector as follows Ch 1 E i RS 232
175. t E nine retire Rp 55 More Bottoni Y ai A A cet ie e ies 55 LESBIANA A a Redes d ea RN du ug RE 55 Left Limit iita de doeet dec entgegen tete dE dede 55 Busht DEI oe SE E rete Lee tete ee ete tee et et eee obe 55 JLopple Pauesco essc BYE Rs 55 Fourier Transform Op rati ns uet ede tere ente e ricotta e dette eta creen 56 Fast Foutier Transform EFT ee eee a e e er iter ee Rte det 57 EET Generation eee etd ee teen dtes 57 Exiting the FFT Mode edidere e beer e vast 60 Discrete Fourier Transform DFT asirini a i a e i 61 DFT General Information eese essent nnne nnne 61 Generating a DFT Using Limit Cursors eese eren nennen 61 Defining the DFT Range Using Limit Cursors eere 62 Defining the DFT Range Using the Time Marker and Cursor 63 Power Spectrum Measurements coooocccnnonnnnononcnnnonnnncnonanononononnnnc non no e nneneeenennenee een hene nennen entere nennen 64 A ee tede dee tre de trenes 64 Power Spectrum Windowing eese nennen enhn nnne nennen neret neren nnne 64 Power Spectrum Smoothing a e a a aE a EE e e trennen 64 X Axis Scala didas 65 Panning the Power Spectrum eese nennen eterne 66 Xe Axis Scaling une erp phu eiii 66 Changing Power Spectrum Amplitude Units eee 66 Exporting the Power Spectrum Coordinates esses nee 66 Inverse Fourier Transformation
176. t a file storage format The file storage format selections are displayed by Clicking the Format gt gt command button The file storage format selections appear on the right side of the dialog box as follows 38 text box check box woo Y 7 Visible channels only Filename sample wdq c windag f 1 ASCII sequential El JO 2 Binary with CODAS header Sy Seve 2 3 Binary without CODAS header h soe d EA fO 5 Spreadsheet print d W Format x JO B Deferred Hard Copy jO 7 DADiSP JO 9 EASYEST LX or AG A nSoft DAC command buttons format option buttons Select the storage format by Clicking the desired format option button With the desired format selected enter in the text box the name of the data file including desired path names to which WINDAQ Waveform Browser is to write the extracted channel data When a file name is entered extract the selected channel s by Clicking the Save command button The data within your selected range but only from the visible channels will be extracted from the existing file and placed in the specified data file Note the Visible channels only check box at the top of the Save As dialog box This option must be selected an X appears in the check box for the extract channels function to work as described above If this option is unselected no X appears in the check box and the extract channels procedure
177. ted channel Moving the Cursor to the Center of the Screen Point to the Search menu and drag down to Center Cursor This moves the cursor to the center of the screen in a selected channel If your computers SCROLL LOCK function is enabled the waveform will move to center screen along with the cursor OR Click the right mouse button anywhere in the bottom annotation line This will also move the cursor to the center of the screen in a selected channel If your computer s SCROLL LOCK function is enabled the waveform will move to center screen along with the cursor When the data cursor is turned on a check mark V is displayed on the Options menu immediately preceding the Data Cursor command This check mark indicates that the cursor is enabled even though it might not be immediately obvious on the screen because of its position at the far right or left margin of the display or because it is otherwise obscured When the cursor is turned off the check mark is not displayed Note that highest peak and lowest valley searches can also be done within the limits of a selection rectangle irr radi Waveform Browser EOF Distance to End of File Displays the distance from the current cursor position to the end of the data file expressed as a percentage distance from cursor to end of file This distance is displayed at the bottom of the screen where 0 EOF indicates that the cursor position is at the be
178. tes the background waveform and grid lines and user annotation color selection bars to show what the palette will look like when the Apply command button is activated 25 Decrement command button Displays the color scheme that defines the previous palette Activating this button decrements the Palette and updates the background waveform and grid lines and user annotation color selection bars to show what the palette will look like when the Apply command button is activated OK command button Saves the new color combination as one of the 16 display choices When saved the original color combination is overwritten Apply command button Allows you to apply or try out new color combinations without having to save them Also used in conjunction with the Increment Decrement buttons to view the 16 defined palettes For example to see what each palette currently looks like activate the Apply button then the Increment button Repeat this procedure 16 times to see each defined palette Cancel command button Allows you to cancel any color changes made to a palette provided that the changes have not been saved with the OK button When canceled the color scheme will revert back to the original palette you started with Monochrome Displays If you are using WINDAQ software with a monochrome monitor select the Monochrome color scheme from the Windows Control Panel Selecting a color scheme other than monochrome may cause
179. tion dB 20 log q 32768 MAG FS where MAG is the magnitude in engineering units of the frequency component and FS is the full scale value of the Y T waveform from which the transform was derived For example if the full scale value was 100 mmHg and the magnitude at a given frequency component is 39 78 the dB value would be 82 30 After the power spectrum is plotted the strength of the frequency component can be toggled from engineering units to relative magnitude or vice versa by Pointing to the Transform menu and dragging down to Mag Engr Units This causes the display in the analysis reporting area to change as follows IDATA 23 4 Hz X1 52 95 DB Bl 30 3 XEOF Magnitude displayed in decibels DATA 23 4 Hz X1 8 475E 03 MAG B1 30 3 XEOF Magnitude displayed in engineering units EXPORTING THE M POWER SPECTRUM COORDINATES While in the transform mode it is possible to export the coordinates that define a transform plot to an ASCII file This is done by Pointing to the Transform menu and dragging down to Output FRQ Data This displays the Save Frequency Data to File dialog box as follows Save A Data to File Filename c M Formar Enter in the text box the name of the data file including desired path names to which the ASCII file is to be written When a file name is entered and the OK command button is activated a second dialog box i
180. tion 6250 H i 5 0000 gec DIV 0 1 Each time recording is activated an event marker is automatically inserted in the data stream This allows acquisition break points to be reviewed using WINDAQ Waveform Browser playback and analysis software This concludes the fast start procedure for recording waveforms to disk The next logical step is to review the data you just recorded This is done with WINDAQ Waveform Browser playback and analysis software WWB To make timing and amplitude measurements review event markers overlap waveforms to examine interdependencies 14 cut and paste portions of waveforms and do all forms of interpretive analysis launch the WINDAQ Waveform Browser by clicking or double clicking on the WINDAQ Waveform Browser icon created during installation Then refer to the section of this manual titled Reviewing Recorded Waveforms with WINDAQ Waveform Browser for complete details Additional Waveform Recording Functions These functions are not requisite for recording or will not necessarily be used every time WINDAQ Lite is used but are included to make recording easier and more productive or to increase display performance and visual appeal WINDAQ Lite Browse This function starts WINDAQ Waveform Browser playback and analysis software directly from WINDAQ Lite recording software This enables you to have both software packages running simultaneously to playback review
181. to Time Marker TM format is selected the Window Print Options are dimmed thus not selectable However the Continuous Print Options are selectable These check boxes allow the user to enable or disable the annotations in the left and right margins of the hard copy and to set a time zoom factor A time zoom factor can be entered to enhance readability when printing on a high resolution printer 300 dpi or higher For example at a time zoom factor of 1 printed at 300 dpi there will be 300 samples per vertical inch of waveform This may not reveal enough important detail in the waveform Increasing the time zoom factor allows you to vertically spread out the samples the horizontal dimension remains unchanged for better visibility A time zoom factor of 2 would produce 150 samples per vertical inch and thus more detail in the hard copy Set these options as desired and activate the OK command button When the OK command button is activated the screen will be cleared and the following dialog box will be displayed Hard Copy Comment Hard Copy Comment You have the option of entering up to one full line 70 characters of text comments that will be passed to the hard copy record After your comments are entered or if you choose not to comment activate the OK command button At this point waveform hard copy will begin at your printer Interpreting the Hard Copy Record The following describes the information pr
182. ton to change the spectrums frequency compression Successive activations apply increasing magnification scaling factors to a maximum value of 4X When the desired magnification factor is entered activating the OK command button applies the magnification When the spectrum is magnified in a way that prohibits the display of the entire power spectrum on a single screen width a scroll bar appears at the bottom of the plot area allowing you to pan the entire plot Activating the shrink command button decreases the magnification factor to a limit of p where p n 2 1 640 1 and is the number of pages needed to display individual frequencies of an n point transform The current power of magnification is displayed in the analysis reporting area as follows DATA 23 4 Hz X1 52 95 DB Bl 30 3 XEOF Display with 1X magnification factor IDAT 23 4 Hz X2 3 IDATA 23 4 Hz X3 52 95 DB Bl 30 3 XEOF Display with 2X magnification factor 52 95 DB Bl 30 3 XEOF Display with 3X magnification factor IDATA 23 4 Hz X41 52 95 DR R1Y 30 3 EOF T Display with 4X magnification factor Panning the Power Spectrum Whenever a magnification factor greater than l p is active the entire power spectrum cannot appear on a single screen For this reason a scroll bar automatically appears at the bottom of the plot to allow you to scroll the entire plot Y AXIS SCALING After the power spectrum is
183. transform into display window one e g type 125 if you wish to transform channel 5 After this is accomplished scroll the display of the selected channel to center the area you wish to transform on the screen The DFT can now be generated directly from either the Y T or the X Y display modes as follows Point to the Transform menu and drag down to DFT If an FFT was not done prior to this DFT the resulting calculation will consist of the points on the waveform bounded by the Y T window chart edges as shown below DFT range Note limit cursors are at extreme left and right chart edges File Edit WINDAQ EMG DAT y iew Search Scaling Transform Options Help DATA 15 6 Hz X1 57 78 DB EU 32 0 EOF PRR BEEN ON OT OM OM OO CQ Q OQ OQ E ER eR RE 36 12 oja m m ro m co c co s 0 amp C du c dum n m n M x co c co v With the limit cursors at the extreme left and right chart edges of the Y T window you get a DFT of exactly what you see in Y T window 1 Of course you can adjust the limit cursors to get any length of waveform you desire If an FFT was done prior to generating the DFT the limit cursors will not be at the extreme left and right chart edges but instead will be some power of 2 apart i e 512 pixels apart Which does not give you a DFT of exactly what you see in window 1 The following illustration shows this subtle b
184. u to reposition it with the and cursor control keys Repositioning the left limit cursor allows you to adjust the amount of data to be transformed however the amount of travel is bounded by the left chart edge and the center cursor Note that when the left limit cursor is selected it appears as a solid line while the center and right cursors remain dotted Note also that the left limit cursor may be selected and adjusted more easily by dragging with the left mouse button just below it in the analysis reporting area To select the left limit cursor for adjustment proceed as follows Point to the View menu and drag down to Left Limit RIGHT LIMIT Function This command selects the right limit cursor in the Y T waveform area or upper pane allowing you to reposition it with the lt and gt cursor control keys Repositioning the right limit cursor allows you to adjust the amount of data to be transformed however the amount of travel is bounded by the right chart edge and the center cursor Note that when the right limit cursor is selected it appears as a solid line while the center and left cursors remain dotted Note also that the right limit cursor may be selected and adjusted more easily by dragging with the left mouse button just below it in the analysis reporting area To select the right limit cursor for adjustment proceed as follows Point to the View menu and drag down to Right Limit TOGGLE PANE Function This c
185. ut important point Position of limit cursors after an FFT has been performed WINDAQ EMG DAT File Edit View Search Scaling Transform Options Help 09552 Volt S Since the transform algorithm assumes that the time series is defined by the left and right limit cursors a DFT performed after an FFT will produce a power spectrum over the range defined by the position of the limit cursors as shown above A very different power spectrum will be obtained from this range compared to one obtained with the limit cursors at extreme chart edge It is possible to reposition the limit cursors at the 62 chart edges or wherever desired of window 1 and then perform the DFT Such a procedure is described as follows Defining the DFT Range Using Limit Cursors Before generating a DFT the right limit cursor and left limit cursor should be adjusted to enclose an integer or whole number of cycles on the waveform to be transformed This is best accomplished by picking a spot on the waveform where the slope is steep and a single points value is well defined like near the midpoint of a waveform Also keep in mind that the DFT is generated over the range including those points occupied by the limit cursors So position the limit cursors accordingly taking care not to enclose one too many points when defining your cycle To adjust the limit cursors Position the mouse point
186. values at the point of waveform cursor or waveform base line intersection The values are annotated in the left right annotation margin next to the VARIABLE WAVEFORM ASSIGNMENT indicator The data display waveform annotation option must be enabled before waveform cursor or waveform base line values can be toggled With the data display option enabled Point to the Options menu and drag down to Data Cursor In addition to turning the data cursor on and off this toggles the waveform value display between waveform cursor intersection point values and waveform base line intersection point values As the following illustrations show when cursor oriented waveform data is enabled the cursor mode designator at the bottom of the screen indicates DATA and when base line oriented waveform data is enabled the cursor mode designator indicates BASE Cursor oriented Waveform value at Cursor mode designator point of intersection 5 Mz 000 NA AAA vie AUN E Base line oriented The annotated waveform value will be either the raw waveform voltage or the waveform voltage converted into engineering units if calibrated Wi nDaa Waveform Browser Event Markers Allows you to automatically locate event markers that were enabled during data acquisition display the date and time at the current cursor position quickly vector to any part of the data file and
187. veform scroll speed for your particular computer copy the file to hard disk If you do not have a hard disk copy the data file to virtual disk and specify the virtual disk s drive letter when invoking Playback Refer to the VDISK command of your computer s DOS manual version 3 0 or greater for full VDISK details ee Waveform Browser Autoscroll Right Autoscroll Left Automatically hands off scrolls the data file When selected either one of these functions will scroll the file in the direction selected left or right until the end of the file is reached or any other key on the keyboard is pressed To autoscroll the data file Point to the Search menu and drag down to Autoscroll Right or Autoscroll Left WiNDAQ Waveform Browser Channel Settings Provides information about the selected channel This information tells you what the sample rate acquisition method input type dynamic range etc settings were when the channel was recorded Since most of the settings this function displays can be assigned on a per channel basis in WINDAQ Lite recording software the desired channel must first be selected 1 Select the desired channel Click the left mouse button in the desired channel s annotation margin 30 File Edit View File Mode Oscill Mode Oscill B s F3 200 S s F3 200 s s F3 200 10 000 10 000 001 001 E 001 1 0 Volt 0 A Volt f Volt 10 000 zin 10 000 Edit View File
188. ware will be free from defects in materials and workmanship under normal use and service for a period of one year from the date of shipment DATAQ Instruments obligations under this warranty shall not arise until the defective material is shipped freight prepaid to DATAQ Instruments The only responsibility of DATAQ Instruments under this warranty is to repair or replace at its discretion and on a free of charge basis the defective material This warranty does not extend to products that have been repaired or altered by persons other than DATAQ Instruments employees or products that have been subjected to misuse neglect improper installation or accident DATAQ Instruments shall have no liability for incidental or consequential damages of any kind arising out of the sale installation or use of its products Service Policy 1 All products returned to DATAQ Instruments for service regardless of warranty status must be on a freight prepaid basis 2 DATAQ Instruments will repair or replace any defective product within five days of its receipt 3 For in warranty repairs DATAQ Instruments will return repaired items to the buyer freight prepaid Out of warranty repairs will be returned with freight prepaid and added to the service invoice Table of Contents Introductio sesse essre eese ea ouo o ro c eoo eno Cot ee e o e eos o s ee Vo aoeo soe eov veo see vov it Conventions Used in the Documentation ooooconoocccnnnoocnnnnonenonon
189. was first invoked 2 The specified range of waveform information is extracted copied from the currently active waveform data file then pasted into the newly created file using the CODAS with data file header format along with any calibration information 3 CALC is run and initialized with the default file name of that containing the pasted waveforms At this point the CALC first level menu will be displayed and you may execute your required CALC function s on the data file containing the pasted waveforms or even change the default file name to operate on another file When CALC is exited control returns to the playback software in the state that existed just before EXPORT was selected The waveform data file from which waveforms were copied remains as the active playback file 4 DO NOT PASTE DATA IN A COMPRESSED FORMAT WHEN USING THE ADVANCED CODAS CALC OPTION Note that Advanced CODAS is a separately purchased software utility for waveform analysis EASYEST LX or AG When this data storage format is selected data is stored in a fashion that is directly compatible with the light versions of ASYST software called EASYEST LX or EASYEST AG These two flavors of EASYEST are smaller simpler less complex versions of ASYST software nSoft DAC When this data storage format is selected data is stored in a fashion that is directly compatible with the nSoft DAC package from nCode International Inc This format
190. ws you to reconstruct the original signal as a function of time from the power spectrum as a function of frequency This capability makes power spectrum filtering possible The IFT also comes in handy when determining what a certain power spectrum represents Suppose you open a file that was saved and exited from the split screen Fourier transform utility The screen will display the typical split screen Fourier transform mode with a power spectrum that you know very little about at first glance The quickest way to find out what that power spectrum represents is to do an IFT and compare this result displayed in window 2 of the Y T area with the original waveform in window 1 of the Y T area The IFT will show you the portion of the original waveform that was used to generate the power spectrum Refer to the subheading in this section titled IFT GENERATION for further information on editing in the frequency domain 57 FAST FOURIER TRANSFORM FFT FFT GENERATION The FFT is ideally suited for homogeneous type waveforms waveforms that have the same structure throughout or have a similar cyclic repetition but need not be limited to this type Before an FFT can be generated the channel you wish to transform must be moved into display window one e g type 1 5 if you wish to transform channel 5 After this is accomplished scroll the display of the selected channel to center the area you wish to transform on the screen The FFT
191. y 640 pixels of horizontal screen resolution are available for display In this case the maximum power of 2 that will fit inside 640 pixels is 512 so the 512 point FFT 58 selection will be highlighted in the Number of Points list box When the OK command button is activated and the 512 point FFT is performed the data to be transformed is taken from the center of the screen in window 1 256 data points in both directions from the center of the screen will be transformed Similarly with a 1024 point FFT 512 data points in both directions are included in the FFT calculation and so on with the other choices Note that you are not limited to only a 512 point FFT You can select a smaller or larger sized FFT from the list So which size FFT is right for your waveform That depends on what you want to see in the power spectrum and how much resolution you want Beside calculation speed which is negligible the only difference between a 512 point transform and a 16384 point transform is resolution A power spectrum always ranges from the dc level 0 Hz to one half the sample rate of the waveform being transformed so the number of points in the transform defines the power spectrum resolution a 512 point FFT would have 256 points in its power spectrum a 1024 point FFT would have 512 points in its power spectrum and so on Suppose you wanted to see separate 20 and 21 Hz frequency components in the power spectrum of a complex waveform A 5
192. y on top of the time marker and compression is 1 the live display field shows zero no change It is possible to see a negative percent change value in the live display field for this format This occurs when the cursor is moved to a point on the waveform that is larger than the value of the waveform at the time marker If waveform compression is enabled the data values reported by the time marker and cursor will be MID MIN or MAX line segment values rather than a single data point value that would be displayed on an uncompressed waveform Slope of Line to Time Marker Point This format annotates the slope of an imaginary line formed by connecting the waveform value at the time marker position with the waveform value at the cursor position To display the slope of the line to TM point in the live display field 1 Point to the Options menu and drag down to Select Live Display 2 Click on Slope of line to TM pt When the slope of line to time marker point format is selected the live display field will show XXXXXXXXX SLOPETM where XXXXXXXXX is the slope of an imaginary straight line between time marker position and cursor position expressed in scientific notation Live display field shows the slope of an imaginary line drawn through the points of time marker and cursor intersection 0731 SEC TH Cursor Time marker Note that the time marker must be enabled for di
193. y vector to any area of the data file rire Browser Split Exit Enter Split More Bottom Y Less Bottom Y Left Limit Right Limit Toggle Pane Seven individual functions provide a way for you to manipulate the split screens or top and bottom panes which are present when the Fourier Transform Operations or X Y Plotting functions have been used Operations such as Split Exit Enter Split More Bottom Y Less Bottom Y Left Limit Right Limit and Toggle Pane allow you to adjust maneuver or otherwise control the split screen display Each function is described as follows SPLIT Function This command allows you to adjust the size of the split between the top and bottom screen sections or panes Point to the View menu and drag down to Split This causes a horizontal bar to appear onscreen Use the mouse to move the bar to the desired position and click to anchor the split at the new location The split can also be adjusted by pointing to the split bar with the mouse as follows 10 0000 i i 2 4725 Sine 10 0000 i 7i H DA 16 696 SEC TBF When positioned anywhere inside the split bar the mouse pointer takes on a different shape indicating that you can now drag with the left mouse button to adjust the split which divides the window into horizontal panes When the left mouse button is released the split will appear where positioned Split bar point here off SECITM

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