WinScatter User Manual
Contents
1. 4 1 Errors when running the application e The application does not run or there is a warning message showing there are not enough resources available This means that there is not enough memory The minimum required memory is 16MB If your computer fulfills these requirements but this message still appears make sure there are no other applications running at the same time Make also sure that there are at least 20MB free on the hard disk Although WinScatter works on the different 32 bit Windows operating systems it is strongly recommended to use it on those systems based on NT technology namely Windows NT 4 0 Windows 2000 and Windows XP e When running the application there is a message in the Connecting to the oscillo scope window showing that the connection has failed This can be due to one of the following three reasons 1 You are working on a computer which has no connection to the oscilloscope through GPIB In that case you can only work off line You should have a GPIB card installed on your computer and a GPIB cable connected to the oscilloscope 2 The oscilloscope has not been correctly configured to enable external control through the GPIB card installed in the computer Make sure that you have fol lowed the instructions explained in section 3 1 on page 11 Then try to connect to the oscilloscope clicking the button Try again After that the application should display the button On line2. write or close the file being accessed EBUS GPIB bus error This error results when a certain GPIB bus error occurs during device functions All de vice functions send command bytes to perform addressing and other bus managements Devices are expected to accept those command bytes within the time limit specified by the default configuration or the ibtmo function EBUS results if a timeout ocurred while sending these command bytes 4 3 Errors in GPIB communications 29 e ESTB Serial poll status byte queue overflow This error is reported only by the ibrsp function ESTB indicates that one or more serial poll status bytes received from automatic serial polls have been discarded because of a lack of storage space e ESRQ SRQ stuck in ON position This error can only be returned by a device level ibwait call with RQS set in the mask ESRQ indicates that a wait for RQS is not possible because the GPIB SRQ line is stuck on e ETAB Table problem This error occurs only during the FindLstn and FindRQS functions ETAB indicates that there was some problem with a table used by these functions 30 Troubleshooting Bibliography 1 Hamamatsu Photonics K K Sampling optical oscilloscope OOS 01 Online Available http www hamamatsu com 2 GPIB user manual for Win32 National Instruments Austin Texas June 1998
3. frame or the Operations menu Press F3 to display the 1st channel on the oscilloscope press F4 to display the 2nd channel Select Export Waveform to inside Edit menu to export waveform data to Excel OriginPro MATLAB or Mathematica Select the columns in the data grid and press Ctrl C or select Copy inside Edit menu to copy their content and put it on the ClipBoard Figure 3 13 Window showing operating instructions Finally Fig 3 14 shows the window popped up when selecting About WinScatter About Winscatter WinScatter Version 1 9 Copyright C 2000 2010 Gotzon Aldabaldetreku A Applied Photonics Group University of the Basque Country WinScatter comes with ABSOLUTELY NO WARRANTY This is free software and you are welcome to redistribute it under certain conditions See the GNU General Public License for details Figure 3 14 About window 3 5 Working off line There are two ways to work off line 1 Clicking the button Off line in the dialog box Connecting to the optical oscilloscope when you initialize the application see Fig 3 2 on page 12 2 Selecting the option Off line through the Mathematical operations menu see sub section 3 4 3 on page 21 If you do this the window shown in Fig 3 15 will pop up When you work off line you can only access to a limited set of options e Main Menu You can open and save files display the waveform and export waveform d
4. on page 22 e The oscilloscope has not been correctly configured to enable external control through the GPIB card installed in the computer Make sure that you have followed the instructions previously explained in this section Then try to connect to the oscilloscope clicking the button Try again After that the application should display the button On line e There is an error in the GPIB bus or the GPIB card installed in your computer If you cannot connect to the oscilloscope in spite of having followed the steps explained before in this section perhaps the GPIB cable is damaged or the GPIB card does not work properly It is recommendable to note down the error code and refer to section 4 3 on page 27 Connecting to the optical oscilloscope Information about the connection The optical oscilloscope Hamamatsu has initialized successfully You can choose between working on line or off line Working on line all features are enabled Working off line the program will only allow you to open and save files or copy the selection from the grid and put it on the Clipboard Off line Figure 3 2 Connecting to the oscilloscope 3 2 Overview of the control panel and the main menu The control panel and the main menu are shown in Fig 3 3 The main options of the application are the following e File It allows you to open or save files You can also exit the application through this menu e Edit It allows you t
5. the file is corrupted because the storage system has been damaged or any inconsistence in the File System of the operative system 4 3 Errors in GPIB communications In the following section the possible GPIB errors are enumerated and described For more information please refer to 2 e EDVR System error This error occurs when you try to access a board or device that is not installed or configured properly e ECIC Function requires GPIB board to be CIC This error occurs when a command is sent to the GPIB board and the latter is not configured as the CIC or there are conflicts because of having multiple controllers e ENOL No Listeners on the GPIB This error usually occurs when a writing operation is attempted with no Listeners addressed For a device writing ENOL indicates that the GPIB address configured for that device in the software does not match the GPIB address of any device connected to the bus that the GPIB cable is not connected to the device or that the device is not powered on 28 Troubleshooting EADR GPIB board not addressed correctly This error occurs when the GPIB board is CIC and is not properly addressing itself before the read and write functions This error is usually associated with board level functions EARG Invalid argument to function call This error results when an invalid argument is passed to a function call ESAC GPIB board not System Controller as required This er
6. 04 7 5 1 286200e 004 10 0 1 4435008 004 125 1 097200e 004 15 0 1 2570008 004 17 5 nnd gt gt Display waveform Figure 3 9 Samples of the waveform Waveform Time range 50ps DIV Horizontal expansion xl Sampling points 4096 Figure 3 10 Box displaying a waveform 3 4 1 File It allows you to open or save files You can also exit the application through this menu Open It opens waveform data stored in a file with the sct default extension If you attempt to open a file which does not contain valid data an error message will be displayed You can also access the dialog box Open using the shortcut key Ctrl O Save and Save as The application stores the waveform data with the sct default extension Selecting Save you will overwrite previously saved data with the latest parameters whereas selecting Save ES ss Operations View Help Save Ctrl s Save As Exit Figure 3 11 Main menu 20 Operating instructions as the application will ask you a new name for the file to be created You can also access the dialog box Save using the shortcut key Ctrl 5 Exit You can exit the application in one of the following ways e Selecting Exit through File menu e Clicking the close special button on the right top of the window e Using the shortcut key Alt F7 e While maintaining Alt key press F release it and then press X To restore the control in
7. 3 There is an error in the GPIB bus or in the GPIB card installed in your computer If you cannot connect to the oscilloscope in spite of having followed the steps explained before in this section perhaps the GPIB cable is damaged or the GPIB card does not work properly It is recommendable to note down the error code and refer to section 4 3 on page 27 WinScatter has not been tested on Windows Vista or Windows 7 operating systems Troubleshooting 4 2 Errors when using functions of the application e When selecting any of the options of the control panel there is a message showing a GPIB error This can be due to the following reasons 1 You have gone back to the LOCAL mode pressing the F4 key on the front panel of the oscilloscope disabling the external control of the latter through the GPIB interface For security reasons the application will switch to off line If you want to restore the connection to the oscilloscope you have to exit the application and run it again preparing the oscilloscope by following the instructions explained in section 3 1 on page 11 2 There is an error in GPIB bus or the GPIB card installed in your computer Perhaps the GPIB cable is damaged or the GPIB card does not work properly It is recommendable to note down the error code and refer to section 4 3 on page 27 In this case the application will also switch off line e Sensitivity cannot be changed The combo box Sensitivity is disa
8. WinScatter User Manual Applied Photonics Group Contents 1 Introduction 2 Installation procedures 3 Operating instructions 3 1 Connecting to the oscilloscope 3 2 Overview of the control panel and the main menu 3 3 Control panel r tri a Men late a es 3 3 1 Scanning the waveform 3 3 2 Display options LL 3 3 3 Display operations 3 94 LOUTSOLS 2 4 2 8 e 2a aah eo de Bud A 3 3 5 Special functions 424 i sadi Bae ash HE eh ae dd a 3 3 0 Data transfer 4 54 Lad OL a MAN ae rn 3 3 7 Waveform data 2 2 2 Coon nn nn 3 4 Main menu options SAM Eile 2 soa des a ae ee Bry en eet Her Ban ges ee TE 342 Edit saggia die a oN ah ee Gai i Dei deed ate OAS DAS 0 Operations sca Boe Ga ees GOR He a a REE a ee Di VIEW RER A LM as asad Safe GSE ae a dra S45 NN 3 5 Working off line cuida e e a a 4 Troubleshooting 4 1 Errors when running the application 4 2 Errors when using functions of the application 4 3 Errors in GPIB communications 4 CONTENTS List of Figures 3 1 3 2 3 3 3 4 3 9 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 3 14 3 15 3 16 Preparing the oscilloscope for external control through GPIB 11 Connecting to the oscilloscope 12 Control panel and main men
9. ata to other applications 3 5 Working off line 23 Winscatter A The program will switch to off line only allowing you to to open and save files or copy the selection from the grid and put it in the Clipboard To recover the connection to the oscilloscope you have to exit the program and run it again Figure 3 15 Off line warning window e Control panel You can only access to the controls located inside the frames Special functions and Waveform data Working off line the special function buttons behave in the same way as the button Functions inside the frame Waveform data It is important to notice that when the communication link between the computer and the oscilloscope has been cut off the application switches automatically to off line displaying an error message with the reasons for the failure see Fig 3 16 Winscatter GPIB error Error sendind the command NORMAL to the oscilloscope Error code EABO I O operation aborted timeout The program will automatically switch to off line allowing you to only open and save files or copy the selection from the grid and put it in the Clipboard To recover the connection to the oscilloscope you have to exit the program and run it again Figure 3 16 Communication error message In such a case it is recommendable to note down the error code and refer to section 4 3 on page 27 24 Operating instructions Chapter 4 Troubleshooting
10. bled when The waveform scanning has been stopped with the command Stop The execution of the commands Accumulate or Rolling average has finished The linear display type has been selected Waveform data have been transferred from the computer to one of the channels CH1 or CH2 The contents of one of the four internal memories has been transferred to one of the channels e Vertical expansion cannot be changed The combo box Vertical expansion is disabled when There has been selected the linear display type There has been selected one of the two logarithmic display types Logarithmic logio or Logarithmic In e Horizontal expansion cannot be changed The combo box Horizontal expansion is disabled when The waveform scanning has been stopped with the command Stop The execution of the commands Accumulate or Rolling average has finished Waveform data have been transferred from the computer to one of the channels CH1 or CH2 The contents of one of the four internal memories has been transferred to one of the channels e The cursors cannot be changed to the 2nd window In order to be able to select this option it is necessary to have waveform data on the 2nd window To achieve this you have to transfer data from the computer see subsection 3 3 6 on page 16 or use the dialog box Internal Memory Storage see sub
11. d and change the name winscatt next to the function command with that one you will use to save the file You can finally run it typing the file name in MATLAB Command Window Mathematica Open Mathematica paste the content of the clipboard on the com mand window and press Intro Mathematica will automatically display the waveform 3 4 Main menu options 21 Copy from grid This option allows you to copy the selected data on the grid placed inside the frame Waveform data and put them on the clipboard Then they can be pasted in any other application such as word processors or spreadsheets You can also copy the content using the shortcut key Ctrl C 3 4 3 Operations It allows you to display the dialog boxes corresponding to the data transfer between the computer and the oscilloscope the internal memory storage and the performance of mathe matical operations with previously stored waveforms It also allows you to switch off line interrupting the communication with the oscilloscope Mathematical operations If you select this option the dialog box shown in Fig 3 12 is displayed Operational 2nd Figure 3 12 Dialog box for mathematical operations You can perform 4 different arithmetic operations on two waveforms The measurement parameters time range sensitivity number of samples etc for both waveforms must be the same First of all you have to select the first operand then the operan
12. e CH2 When downloading the waveform scanned by the photomultiplier tube connected to the port CH2 is transferred to the computer When uploading the waveform data is displayed on the 2nd window e M1 M2 M3 and MA The data transfer takes place between the computer and one of the four internal memories of the oscilloscope If you request data from an empty memory the application shows a warning message see Fig 3 5 At the bottom of the control panel a progress bar shows the progress of the transfer This dialog box can also be reached via the Operations menu 3 3 Control panel 17 Winscatter A No data in M1 Figure 3 5 Warning message Internal Memory Storage Figure 3 6 shows the button that pops up the Internal Memory Storage dialog box When clicking the button that shows the arrow towards the right the field 1st window of the list box Display Window refers to the photomultiplier tube connected to the port CHI of the oscilloscope whereas the field 2nd window refers to the tube connected to CH2 Therefore the data storage takes place from one of the channels of the oscilloscope to the chosen internal memory Instead when clicking on the button that shows the arrow towards the left the data exchange takes place from the chosen internal memory to the chosen display window This dialog box can also be reached via the Operations menu 3 3 7 Waveform data The information corres
13. e device and an incorrect usage could result in permanent damage Next we are going to show the main features of the application and we will explain how 1t operates Introduction Chapter 2 Installation procedures WinScatter works on Intel based computers under Windows 95 Windows 98 Windows NT 4 0 Windows 2000 or Windows XP The minimum requirements are the following 16 MB RAM 1 2 GB hard disk and a GPIB card In order to install the application insert the WinScatter CD ROM select the WinScatter folder and copy it into your computer Next open the WinScatter folder and run the batch file RegisterMsFlxGrd bat in order to register the Microsoft FlexGrid ActiveX component this action is absolutely necessary in order to be able to run the application Afterwards open the WinScatter ini configuration file using an ASCII text editor and set the proper address parameters of your GPIB board and the Hamamatsu OOS 01 oscilloscope Once the application has been installed and properly configured double click the Win Scatter exe application file and it will start up automatically The window style varies depending on the operating system The figures shown later in this manual were taken using Windows XP 10 Installation procedures Chapter 3 Operating instructions 3 1 Connecting to the oscilloscope First of all preparations have to be made in the oscilloscope so as to enable the external contro
14. l through the GPIB interface This is done following these steps 1 Power on the oscilloscope and the laser driver 2 Select CONT in the TRIG MODE switch of the laser drive in order to input the trigger signal in the oscilloscope 3 Using the control panel of the oscilloscope press the SEL key twice and then the F4 REMOTE key as shown in Fig 3 1 Tre ee rei AN one see outro econ CURRENT MATH REMOTE frase T_T RS MET Figure 3 1 Preparing the oscilloscope for external control through GPIB Now the oscilloscope is in the remote control status If you now run the application the window shown in Fig 3 2 will be displayed If the connection to the oscilloscope is successful you will be able to choose between working on line all features enabled or off line you can only access to certain functions If the connection has failed it can be due to one of the following three reasons From now on the laser diode is emitting Therefore special care should be taken Operating instructions e You are working on a computer which has no connection to the oscilloscope through GPIB In that case you will be able to work only off line It is important to note that this is not an error this operation mode has been intentionally designed to allow the user to work with previously stored measurements in computers with no connection to the oscilloscope This operation mode will be explained in detail in section 3 5
15. n rate It shows the scan rate used during waveform acquisition Accum count It shows the total number of accumulated waveforms Channel no It shows the number of the photomultiplier tube used to scan the waveform If there is only one tube connected to CH1 this parameter is always set to 0 waveform data Functions S Samples 50ps DIV Horizontal exp x1 Aperture time Sampling points 4096 Sensitivity 1x10E3 Scan rate 500 Accum count 200 Channel no 0 Display waveform Figure 3 8 Parameters of the waveform e Samples Clicking this button the samples of the measured waveform are shown Each sample consists of a pair of values the first value shows the time in ps and the second value shows raw data related to the number of intensity counts these raw data do not take into account the selected scan rate and the number of accummulations An example is shown in Fig 3 9 Finally clicking the button Display waveform placed at the bottom of the grid a box displaying the acquired waveform is shown normalized to its maximum value Figure 3 10 on page 19 shows the latter 3 4 Main menu options This section explains the options available through the main menu those options already explained in the previous section will be briefly mentioned Figure 3 11 shows the main menu 3 4 Main menu options 19 Waveform data Functions Parameters 1 067800e 004 5 1 282400e 004 5 0 1 078900e 0
16. number and copyright Besides the different options of the menu can be accessed quickly using the shortcut keys such as Ctrl Underlined Key Alt Underlined Key or the function keys F1 F2 etc 3 3 Control panel This section explains the operations available on the control panel and the menu 3 3 1 Scanning the waveform Inside the Action frame you can choose the scanning waveform method Stop It stops scanning waveform immediately Normal It starts scanning waveform Accumulate It accumulates waveform data The combo box next to the radio button allows you to specify from 1 to 10000 accumulations Rolling average It averages waveforms while scanning Each average is performed with the latest scan and the previously averaged results The combo box next to the radio button allows you to specify from 1 to 100 averages 14 Operating instructions The Scanning parameters frame contains the most important options that affect the way that waveforms are scanned There are several combo boxes and sliders that allow customizing these parameters e Time Range It sets the time range from 20 ps DIV to 1 us DIV e Sensitivity Changes the sensitivity of the intensity scale Depending on the type of display chosen this issue will be explained below the sensitivity is shown in watts or counts per division e Scan range Sets the scan rate from 1 to 10000 If you increase the scan rate there is an improvement in
17. o copy selected data from the grid Waveform data or export waveform data to other applications e Operations This option allows you to display the dialog boxes corresponding to the data transfer between the computer and the oscilloscope the internal memory storage 3 3 Control panel 13 AA No title WinScatter File Edit Operations View Help Waveform scanning Action Stop Normal Accumulate 20 Rolling average jo y Scanning parameters Time range fins y Sensitivity 5x10E3 Scan rate jo y Sampling points oo 256 512 1024 2048 4096 Special functions Display options Display operations Display settings Horizontal is Vertical sy 1 window Lines expansion 1 expansion Horizontal position 0 ps 2Windows C Dots IV Grid clear 2nd window Data Transfer Display type Linear Logarithmic Log10 Waveform data C watt C Cursors Cursors on 1st window c Cursor 1 4 Cursor 2 Figure 3 3 Control panel and main menu and the performance of mathematical operations with previously stored waveforms It also allows you to switch off line the link to the oscilloscope is cut off e View It allows to switch to the first or the second channel of the oscilloscope It also allows to display the waveform obtained from the oscilloscope in the computer e Help It displays a small window with operating instructions and gives information about version
18. ponding to the waveform transferred to the computer is shown in the grid placed inside the frame Waveform data The three buttons above the grid change the information type shown in the grid e Functions Clicking this button the results for the special functions performed pre viously are shown No data is displayed whenever a function has not been performed An example is shown in Fig 3 7 e Parameters Clicking this button the nine parameters of the waveform are shown see Fig 3 8 on page 18 Source It shows the source of the measured waveform sent to the computer CHI CH2 M1 M2 M3 or M4 Time Range It shows the time range used during waveform acquisition l Horizontal exp It shows the horizontal expansion used to acquire waveform data Aperture time This parameter only makes sense when using CCD sensors instead of a photomultiplier tube me les gt 2nd wi D isplay Window Internal Memory Figure 3 6 Internal Memory Storage 18 Operating instructions Waveform data Functions Parameters Samples Function Value a n 1 068000e 001 4 240000e 000 2 518000e 000 5 990000e 002 7 721000e 001 1 651000e 000 9 983000e 001 4 240000e 000 _ gt Display waveform Figure 3 7 Special functions Sampling points It shows the resolution used during waveform acquisition Sensitivity It shows the sensitivity used to acquire waveform data l Sca
19. ror results when the functions requiring that the GPIB board be the System Controller are called and the latter has not this capability EABO I O operation aborted timeout This error indicates that an I O operation has been cancelled usually due to a timeout condition ENEB Nonexistent GPIB board This error occurs when no GPIB board exists at the I O address specified in the confi guration file This occurs when the board is not physically plugged into the system the I O address specified during the configuration does not match the actual board setting or there is a system conflict with the base I O address EDMA DMA error This error occurs if a system DMA error is encountered when the GPIB software at tempts to transfer data over the GPIB using DMA EOIP Asynchronous I O in progress This error occurs when an asynchronous I O operation has not finished before some other call is made During asynchronous I O you can only use ibstop ibwait and ibonl or perform other non GPIB operations ECAP No capability for operation This error results when your GPIB board cannot carry out an operation or when a particular capability has been disabled in the software and a call that requires the capability is made EFSO File system error This error results when an ibrdf or ibwrtf call encounters a problem performing a file operation Specifically this error indicates that the function is unable to open create seek
20. section 3 3 6 on page 17 4 3 Errors in GPIB communications e The frame Waveform data does not display any information about the waveform displayed in the screen of the oscilloscope It is necessary to transfer this waveform data from the oscilloscope to the computer see subsection 3 3 6 on page 16 e When trying to transfer waveform data from one of the four internal memories to the computer there is a message showing No data If you want to transfer data from one of the four internal memories it is necessary to have previously stored waveform data on that memory transferring data from the computer see subsection 3 3 6 on page 16 or using the dialog box Internal Memory Storage see subsection 3 3 6 on page 17 e Cannot export waveform data If you want to export waveform data to different applications it is necessary to have waveform data on the computer This can be achieved by transferring the waveform data from the oscilloscope to the computer see subsection 3 3 6 on page 16 or by opening a file e Cannot open a file or an error message is displayed Since the application stores the waveform data with the sct default extension you should only open this type of files note that the application lets you open files with any other extension by selecting All files in the list box Opening a file which does not contain valid data will lead to displaying an error message It could also happen that
21. side of the screen is lower than the intensity at the position of the cursor set at the right side otherwise the fall time is determined 16 Operating instructions e MOD It determines the modulation factor of the area between cursors e MIN MAX It determines the maximum and minimum values in the area between cursors e MEAN It determines the mean value of the intensities between cursors e AREA It determines the accumulated value of the intensities between cursors 3 3 6 Data transfer The buttons inside the frame Data transfer allow you to exchange waveform data between the computer and the oscilloscope or to store them in any of the four internal memories of the oscilloscope Data transfer between computer and oscilloscope Figure 3 4 shows the button that pops up the Data transfer dialog box Data Transfer Hamamatsu Figure 3 4 Data transfer between computer and oscilloscope By clicking the button that shows the arrow towards the right the transfer takes place from the computer to the oscilloscope upload whereas if the button showing the arrow towards the left is clicked the transfer takes place from the oscilloscope to the computer download There are six options available in the list box e CH1 When downloading the waveform scanned by the photomultiplier tube connected to the port CH1 is transferred to the computer When uploading the waveform data is displayed on the 1st window
22. t sum rest multiplication or division then the second operand and finally the memory or window you want to store the result Clicking the button Perform the oscilloscope performs the arithmetic operation If you want to exit this dialog box without performing any operation just click the button Cancel Data transfer This is the same option as explained in subsection 3 3 6 on page 16 Internal memory storage This is the same option as explained in subsection 3 3 6 on page 17 Off line Finally this option allows you to switch off line the link to the oscilloscope is cut off The latter will be discussed in section 3 5 on page 22 22 Operating instructions 3 4 4 View This option allows to switch to the first or the second channel of the oscilloscope It also allows to display the waveform obtained from the oscilloscope in the computer the latter has been explained in subsection 3 3 7 on page 17 3 4 5 Help This option displays a small window with operating instructions and gives information about version number and copyright Figure 3 13 shows the operating instructions displayed when selecting Operations Winscatter Insert the required parameters in the corresponding fields For performing measurements Select the waveform scanning method inside the Action frame Measurements can be stored on the computer by means of the dialog box opened clicking on the button inside the Data Transfer
23. the oscilloscope and therefore to make it possible to operate its front panel you must press the F3 RESET key and then the F4 REMOTE key 3 4 2 Edit It allows you to copy selected data from the grid Waveform data or export waveform data to other applications It is also possible to display a pop up menu with the same content as the Edit option with a right mouse click Export waveform to This option allows you to export the waveform data stored on your computer to other appli cations WinScatter will automatically format the data in order to make them suitable for the application you have chosen to export to and it will put them on the clipboard In the following there will be explained what you have to do to paste successfully the data on each application e Spreadsheets WinScatter allows you to export waveform data to Microsoft Excel or OriginPro Microsoft Excel open Microsoft Excel create a new sheet select the first cell and then click the button Paste OriginPro open OriginPro create a new workbook select the first cell and then click the button Paste e Mathematical applications WinScatter creates automatically the required code in order to export this to Mathematica version 3 0 or higher or MATLAB version 5 1 or higher MATLAB Open MATLAB Select M file through File New menu and then the M file editor will be displayed Paste the content of the clipboar
24. the signal to noise ratio but special care must be taken since i the acquisition time becomes longer making the measurement results more sensitive to fluctuations in time and temperature and ii the internal circuitry of the photo multiplier tube is more sensitive to the light intensity i e there is a decrease in the maximum value allowed for the light intensity incident on the oscilloscope Therefore if the message A D SATURATED is displayed on the screen the scan rate must be decreased e Sampling points Sets the number of sampling points between 256 and 4096 The higher the number of sampling points the higher the resolution of the waveform but the higher the acquisition time 3 3 2 Display options The display settings allow you to modify how the waveforms are displayed on the screen of the oscilloscope The options inside the frame Display settings are e 1 Window 2 Windows It switches to the 1 window or 2 window displaying mode In the former the waveforms are displayed superimposed whereas in the latter wave forms are displayed on separate windows e Lines Dots When dot display is specified waveforms are displayed according to the samples acquired in the scanning process whereas when line display is specified waveforms are displayed connected by lines e Grid A grid showing the time and the intensity axes is displayed e Clear 2nd window A click on this button clears the second waveform The radio b
25. to the left 3 3 4 Cursors The oscilloscope has two cursors that move along the time axis The cursors are of great importance since they delimit the region where the special functions are applied Each cursor is controlled by means of scroll bars placed at the bottom of the frame Cursors the left side of the screen of the oscilloscope is specified by position O whereas the right side is specified by position 599 Clicking the radio buttons placed above the scroll bars you can choose between moving both cursors in the 1st window or in the 2nd window provided that two waveforms are displayed 3 3 5 Special functions Clicking one of the buttons inside the frame Special Functions you can perform one of the seven special functions available These functions are performed inside the limits defined by both cursors therefore you should place correctly the cursors before performing these operations The results are displayed on the grid located inside the frame Waveform data as explained in detail in subsection 3 3 7 on page 17 e 11 12 It determines the ratio between the intensities measured in the positions given by the respective cursors and the difference in time between them e FWHM It calculates the Full Width at Half Maximum of a peak placed between both cursors e RISE FALL It determines the rise or fall time The rise time is determined for the case when the intensity at the position of the cursor set at the left
26. u 13 Data transfer between computer and oscilloscope 16 Warning message s cs vial le ae Ba eh a alte AD Aaa 17 Internal Memory Storage 17 Special functions o aoaea 2 Baap e Rae a 18 Parameters of the waveform 18 Samples of the waveform 19 Box displaying a waveform 19 Mainmenu 2 pari lia paia A E Ree er En in 19 Dialog box for mathematical operations 21 Explanation window sario e y ne a Ce 22 ABOUT WINdOWE die 2 en ta ont den niet AE ANSE ds ee 22 Off line warning window 23 Communication error message 23 LIST OF FIGURES Chapter 1 Introduction This manual is intended for operators who are responsible for operating the Sampling Optical Oscilloscope OOS 01 of Hamamatsu This manual aims to e explain in detail how the application works e give the points to keep in mind when operating on the different devices for measuring the bandwidth in optical fibers and e advise how to obtain the highest performance This manual requires a user knowledge of Microsoft Windows operating systems as well as a working knowledge of terms related to optical fibers Furthermore it is strongly recommended to read the user manual of the Optical Oscil loscope 1 since it is an extremely sensitiv
27. uttons inside the frame Display type allow you to choose between a linear display and a logarithmic display e Linear display Linear The waveform is displayed in a linear scale the sensitivity is measured in counts per division Watt The waveform is displayed in watts The waveform is normalized and it is displayed in The sensitivity cannot be changed 3 3 Control panel 15 e Logarithmic display Logarithmic log The waveform is displayed in common logarithm base 10 logarithm The sensitivity cannot be changed Logarithmic In The waveform is displayed in natural logarithm The sensiti vity cannot be changed 3 3 3 Display operations The display operations allow you to modify the vertical and horizontal axes of the waveform as well as to shift it along the horizontal time axis e Horizontal expansion It expands the waveform in relation to the time axis It can be expanded twice x2 three times x3 or four times x4 The selection of the single expansion x1 restores the original time axis e Vertical expansion It expands or compresses the waveform relative to the intensity axis This option cannot be modified if the logarithmic display mode is used e Horizontal position You can shift the waveform display along the time axis by typing the time in picoseconds inside the edit box With negative values the waveform shifts to the right whereas with positive values it shifts
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