LOI User Manual and Software Guide v1.1
Contents
1. Save Data Pressing this control will bring up the Save Data dialog which will allow for saving the acquired data into a tab separated file This button is disabled by default and becomes enabled when data acquisition has started Clear Data Plot This button clears the Force and Temperature plots and deletes the measured data from the memory The button becomes enabled when the measurement stopped This function is also done automatically when the Start measurement button is pressed Finish Pressing this button will cause a clean exit from the software and will write measurement parameters e g measurement rate calibration coefficient to the configuration file config ini When the program is started again this configuration data is accessed and entered automatically so re entry by the user is not necessary When the submenu Moving average is selected from the Analysis menu additional controls will appear on the left panel Moving average When the check box is selected the moving average filter is applied to the acquired data and result is displayed on the plots Period Parameter of the moving average filter Save Pressing this will bring up the Save Data dialog which will save the acquired data with applied moving average filter into a tab delimited file Close Pressing this button will hide the controls relevant to the moving average filter FBG SPECTRA TAB LOI 2F simultaneously interro2. Settings two lines Calibration coefficient Measurement rate Date and time when data acquisition was started LOI xF Interrogator User Manual and Software Guide 10 Section Data Column 1 Elapsed time in seconds Column 2 Measured force in Newtons or wall shear stress in Pascals Column 3 Position of the center of the first FBG peak in nanometers Column 4 Position of the center of the second FBG peak in nanometers Column 5 Measured temperature When the Save button on the FBG spectra tab is pressed the program also prompts for a filename and location to save memorized spectra The data in the tab separated file is organized in four column groups containing the information about pair of FBG spectra The wavelength in nm and power in arb units corresponding to the first FBG spectrum are saved in columns 1 and 2 and those corresponding to the second FBG spectrum in columns 3 and 4 LOI 4F SOFTWARE The operation of the optical sensor interrogator LOI 4F is similar to that of the model LOI 2F Certain differences in software and configuration and output data file are described below INSTALLING AND USING THE SOFTWARE To install the LOI 4F control software follow the procedure described above for the LOI 2F model The main sections of the GUI of the software for the LOI 4F are identical to that for the LOI 2F model and menu and control buttons have the same functionality Since the LOI 4F can be used
3. 1 in nanometers Column 4 Position of the center of the second FBG peak from Channel 1 in nanometers Column 5 Measured temperature from Channel 1 Column 6 Measured force in Newtons or wall shear stress in Pascals from Channel 2 Column 7 Position of the center of the first FBG peak from Channel 2 in nanometers Column 8 Position of the center of the second FBG peak from Channel 2 in nanometers Column 9 Measured temperature from Channel 2 LOI xF Interrogator User Manual and Software Guide 12 FBG spectra data file originates by pressing the Save button on the FBG spectra tab The file is organized in eight column groups Each group contains Column 1 Wavelength in nm corresponding to the first FBG spectrum for the sensor 1 Column 2 Power in arb units corresponding to the first FBG spectrum for the sensor 1 Column 3 Wavelength in nm corresponding to the second FBG spectrum for the sensor 1 Column 4 Power in arb units corresponding to the second FBG spectrum for the sensor 1 Column 5 Wavelength in nm corresponding to the first FBG spectrum for the sensor 2 Column 6 Power in arb units corresponding to the first FBG spectrum for the sensor 2 Column 7 Wavelength in nm corresponding to the second FBG spectrum for the sensor 2 Column 8 Power in arb units corresponding to the second FBG spectrum for the sensor 2 TROUBLESHOOTING e The indicator light does not illuminate when I turn on the
4. aE E ENE a ES E 13 Maintenance and Storage ccccccssescccccececeeeeseeeceeeeeeseeeeeeeeeeeesaesseceeeeeesaeeaseueeeeeeesseesseeeeeeesessaaaseeeeeeesssaaaeeeeeeeeesaaas 13 Lenterra Optical Sensor Interrogator 0 0 ceeccccceceeeceseeseeeceeeeeeeeseeceeeeeeseeeeeeeeeeeeesseeeseceeeeeseeasesseeeeeeeesssaaaeeeeeeeeessaas 14 Specifications LOI 2F and LOAF cs casivanowrssaainoniasnednsdndsanwhasieeantdnaiansankiadinuiewntsbanttnaxduewiadiamneidiisinanedantdeamaaannine 14 SAFETY LASER SAFETY The LOI xF series interrogators are IEC 60825 1 Class 1 laser products they are intrinsically safe and do not pose a health hazard either to the skin or eyes Wavelength Laser radiation 1560 nm Power lt 10 mW ELECTRICAL SAFETY There are no user serviceable parts inside an LOI interrogator and the instrument should not be opened by the operator If you are experiencing problems please contact Lenterra Inc for assistance LOI xF Interrogator User Manual and Software Guide 2 GETTING STARTED WHAT S IN THE BOX e An interrogator e USB type A to USB type B cable e A power cable e A DVD disk WHAT ELSE IS NEEDED e A compatible Lenterra s RealShear or Drag Force Flow DFF sensor e A Microsoft Windows PC Windows XP Windows Vista and Windows 7 supported LOI xF series interrogator can also be used to interrogate third party Fiber Bragg Grating based sensors Recommended minimum PC Specifications e 1 a
5. with two sensors simultaneously two curves are plotted on the Force and Temperature tabs The blue curve corresponds to the channel 1 the green curve to the channel 2 The FBG spectra tab shows four two pairs of FBG spectra on the same plot FBG spectra shown with dark blue and light blue curves correspond to channel 1 and FBG spectra Fi shown with dark green and light green curves to 7850 channel 2 13800 The menu for the LOI 4F is similar to that for LOI 2F except for the Calibration coefficient menu item see the figure on the left Measurements are taken the same way as that described above for the LOI 2F software CONFIG INI FILE There are two differences between LOI 2F config ini file described above and LOI 4F config ini file 1 LOI 4F config ini file has two lines for calibration coefficients in the Main section for sensors 1 and 2 connected to channels 1 and 2 respectively 2 The BO and B1 coefficient for sensors 1 and 2 are in the separate sections wavelength conversion coefficients for sensor 1 and wavelength conversion coefficients for sensor 2 respectively LOI xF Interrogator User Manual and Software Guide 11 Config ini Notepad File Edit Format View Help Eblana Photonics P N EP1557 DM BAA Main Measurement rate Hz 50 000000 Laser wavelength nm 1555 800000 Calibration coefficient for sensor 1 Pa nm 7850 000000000000 Calibration coefficient for sensor 2
6. CE The software window is divided into three main sections Menu The functions of the menu items are described in the section Menu below LOI xF Interrogator User Manual and Software Guide 4 Control Panel The panel on the left side of the window contains user accessible controls See the section Controls for detailed information Data Screen The panel on the right side contains three tabs Force or Wall Shear Stress depending on the settings in the config ini file Temperature and FBG spectra First two tabs show plots with measured force or wall shear stress and temperature and the real time FBG spectra are displayed on the FBG spectra tab To switch between tabs click on tab s name J3 LOI vi3 oO Start measurement Calibration coefficient Find peaks Finish LO Ae FORCE temperature fbg spectra Measurement rate S s 110 Laser wavelength nm 1556 18 Save Data i Clear Data Plot Screenshot of LOI xF Interrogator Software v1 3 21 371 Note By default x axes and y axes of the plots are autoscaled To a manually set the scales the user can right click on an axis and a iar uncheck AutoScale Then by double clicking on the tick mark 44 QEN numbers the user can enter desired axis limits k 21 3 j Marker Spacing ja ie 21 5 4 2 21 3 24 y AutoScale Y 21 365 MENU LOI xF Interrogator User Manual and Software Guide 5 LOI v1 3 Start measurement 4
7. LOI xF SERIES OPTICAL INTERROGATORS USER MANUAL AND SOFTWARE GUIDE 1 LENTERRA CONTENTS LaSer o 2 eee eee ene E eee ee ee ee ee ee 2 Elected S dey fete nen E eee eee ee ee ee ee ee ee 2 GC UGE SAS e EE A E A E A N 3 What s in the BOX ssscssdessucosnscceocedenccdahddcosndensdsdeusectosensaiied edacdselestadusndssnenedinnsdansbcba adesedsdeenecbeeneedisenda hes sdsetncestedasnsidecnedes 3 What Else is Needed cssuraiinninreeniaan mae ia iN E Ei iaaa a aiaa E irian 3 Fontana BACKE INOS oer aen E E E E EE E EEEE E EERE E EE E E E 3 meaai seguen E ssrin a E E E AE 3 SONE a A E E E E A E E ean 4 Motaln he SOWA E ssar eni EE S E EOE E EE T AEO E AEE 4 CORF ON E a A E A A A ain iiecatsuiaebambanaeade duleeieaisansengusiies 4 WE UMS AG bana A E A A E A O EEE E E E E E E E A 4 PONS UD E E A E A E see E E E E A E E A A A E A E T A 5 RO MON e A 6 FEG PS a T Dea E E E ee E E eee ene eee T CORNO SIA FIO pario E E R 8 PARKING Measure MISS eavcsiromaceanananecasennwcenosinass snanaatndinann ec pseasuhobsvencticgpnnaavuvadehia As 10 Data File Formats cssi aissius eaa vss ncualtaesa anaa aia Aaaa keai aes une suudnessateisaetespmadonsad 10 EO EE e e E E E AE A E E A A E E E 11 Installing and Using the SOPWALE ccccccccsseeeeceeeeeeeeeeeeeeceeeeeeeaeeseeeeeeeeeeeaseeeeeeeessaeeaseeeeeeesssssaseeeeeeeeessaaaeeses 11 OTIC gM TG E ON E E A E vse ct A E EEE E O 11 Daa Fe FOO renier S RE E E E E E 12 Troupes NooUN innon e E E OE EEEE RO
8. Pa nm 13800 000000000000 what is measured Wall Shear Stress LD central current mA 80 LD current range mA 80 LD lowest temperature C 15 LD highest temperature C 49 DAQ card Counter Dev1 ctro Output channels Dev1 ao00 1 Input channels Dev1 ai3 7 Output trigger Dev1 PFIO wavelength conversion coefficients for both sensors AO 29789 8631 47 9719217 0 0185340409 1552 9534994 0 011845381525 2 8252214521E 5 0 118848417 32 0 00051678139762 0 00040047 368401 1 042497 821E 7 4 83309559E 6 3 1936155412E 7 C9 1 6394315225E 5 c10 2 9670706408E 7 c11 1 9766805019E 9 Wavelength conversion coefficients for sensor 1 BO 62223 B1 40 Wavelength conversion coefficients for sensor 2 BO 62224 8 B1 40 DATA FILE FORMATS Force wall shear stress data file originates by pressing the Save button on the control panel The following information is saved in the file Section Settings two lines First line Column 1 Calibration coefficients for sensors connected to channel 1 Column 2 Calibration coefficients for sensors connected to channel 2 Column 3 Measurement rate Second line Column 1 Date and time when data acquisition was started Section Data Column 1 Elapsed time in seconds Column 2 Measured force in Newtons or wall shear stress in Pascals from Channel 1 Column 3 Position of the center of the first FBG peak from Channel
9. aging spectra tracking differential spectrum between channels 1 and 2 tracking data logger instrument control 973 623 0755 info lenterra com
10. d requires the LabVIEW Runtime Engine included in the installation disk or a pre existing LabVIEW installation INSTALLING THE SOFTWARE There are Full Installer and Application Only Installer available on the disk The software can also be downloaded from www lenterra com downloads The Full Installer installs the measurement module and all required National Instruments software The Application Only installer is a smaller file that can be used to upgrade any version that was installed previously using a Full Installer To install the software e Unzip the installer into a temporary directory e Run setup exe Follow the on screen instructions It is recommended to keep the default settings e Restart computer when prompted At this instant the interrogator should be connected to the USB port on the PC After restarting a dialogue will appear to import the hardware configuration from the configData nce file located in the directory the software was installed into Click Next and accept defaults in the series of screens that appear afterwards Note It is possible to skip the last step by pressing Cancel if the controller is not plugged in or unavailable at the time of installation The hardware configuration can be imported later through National Instruments Measurement and Automation Explorer under File gt Import An example of the location of the file is Program Files Lenterra LOL v1 3 configData nce LOI 2F SOFTWARE USER INTERFA
11. ectral peaks The wavelength of the laser will be adjusted by software until the peaks are located in the center of the laser wavelength scanning range If the software does not find the characteristic FBG spectral peaks a corresponding message will appear Finish Clicking on this menu item will cause a clean exit from the software and will write the various software parameters for example measurement rate to the configuration file config ini When the program is started again this configuration data is accessed and entered automatically so re entry by the user is not necessary CONTROLS Measurement Rate S s The rate at which force or wall shear stress data points will be recorded Choose one of the 12 pre set values from 0 25 Samples per seconds 15 measurements per minute to 500 Samples per seconds LOI xF Interrogator User Manual and Software Guide 6 Laser wavelength the indicator displays the central wavelength of the E scan range The software will initially show the laser wavelength suggested for particular interrogator The value can be adjusted if it is required for the measurement see section Taking measurement for Ap ae details If entered value is outside of the available range for particular y 1556 18 controller it will be rounded to the nearest wavelength range limit Start Measurement the function of this button is identical to that of the Start Measurement menu item see the description above
12. ed for temperature calibration If temperature recalibration of the sensor is required do the following steps o Measure the ambient temperature T of the sensor o Determine the positions of the FBG peaks at this temperature To do that run the software acquire data for a short period of time and save the data Peaks centers A and A are recorded in the columns 3 and 4 of the file LOI xF Interrogator User Manual and Software Guide 9 A o Use formula BO T Bl where T is in C 4 and 4 are in nm and value for B1 is taken from the config ini file o Enter the new value of BO into config ini file and save it TAKING MEASUREMENTS e Start the software e Click on the FBG spectra tab and make sure that FBG peaks are approximately at the center of the Real time spectra plot The Force Wall Shear Stress and temperature measurements are only valid if the maxima of the FBG spectra are inside the total wavelength range as displayed on the Real time spectra plot If this is not the case bring the peaks to the center of the plot It is possible to center peaks by clicking on the Find peaks menu item The interrogator will automatically search for the peaks and position them in the center of the plot as in the figure on page 8 One can also search for peaks manually by entering a value for the central laser wavelength on the control panel of the GUI Manual adjustment can be done either before or after the measurement started wh
13. f the laser diode which defines the longest Ep wavelength IT IS NOT RECOMMENDED TO CHANGE c4 0 00016955698759 cs 0 0001171700961 THIS PARAMETER C 1 2891113884E 9 C7 2 1829281126E 6 CB 6 436239487 7E 8 i D _ 1 Ee 22 Re eee ep lees What is measured Choices are Force or Wall C10 1 87602203874E F7 oy a ee a Shear Stress The axis titles saved data format and other related outputs are adjusted according to this parameter DAQ card section Channel names of the NI DAQ card are specified here The first part of the name looks like DevN where N is an integer number It is the name of the DAQ card as it seen by the computer By default the name is Dev1 but if National Instruments DAQ cards were used before with the computer the number could be higher For example it is Dev12 in the figure above The appropriate DAQ card number can be found in the NI Measurement and Automation Explorer NI MAX which is a part of the Full Installer package If the device number in NI MAX is different from what is specified in config ini file the name in the file should be adjusted accordingly Wavelength conversion coefficients section A0 A2 B1 C0 C11 Parameters used to convert laser current laser diode temperature to laser wavelength and back and to determine the temperature of the sensor from the FBG peak positions IT IS NOT RECOMMENDED TO CHANGE THESE PARAMETERS BO This parameter is us
14. gates two and LOI 4F four fiber Bragg gratings FBGs The reflection spectra from each FBG are displayed in real time in this tab and could be memorized selectively This window allows for real time control of the spectra positions on the wavelength scale and it is intended to alert the user when the laser wavelength needs to be adjusted this operation is required when the spectra shift away from the displayed wavelength range LOI xF Interrogator User Manual and Software Guide 7 Real time spectra plot Spectra acquired by the interrogator shown in real time Memorize Pressing this button copies most recent spectrum from each channel to the Memorized spectra plot Memorized spectra plot Displays spectra that were recorded by pressing the Memorize button Save Brings up the Save Data dialog which saves the memorized spectra into a tab delimited file Clear This button clears the memorized spectra chart CONFIG INI FILE Config ini is a file stores parameters required for interrogator operation When the software starts it reads these parameters from the file and the updated parameters if any are written back in this file when the software is exiting Config ini is in text format and can be edited in any text editor for example in Notepad Main section Measurement Rate Hz The rate at which data points will be recorded Laser wavelength nm The central wavelength of the laser wavelength scan range Calibra
15. hers SPECIFICATIONS LOI 2F AND LOI 4F MECHANICAL ENVIRONMENTAL ELECTRICAL PROPERTIES Length Width Height Weight Voltage requirements Operating temperature Storage temperature OPTICAL PROPERTIES Light source Central wavelength Linewidth FWHM Scan range via laser temperature via laser current Scan rate via laser temperature via laser current Scan frequency via laser current Wavelength increment at 0 25 Hz at 10 Hz at 100 Hz at 500 Hz FBG spectrum tracking repeatability at 0 25 Hz at 10 Hz at 100 Hz at 500 Hz Number of optical channels Connector Photodiode amplifier gain DATA PROCESSING CAPABILITIES Interface Software type Software capabilities Typical actual values vary Custom orders for frequencies above 500 Hz One sigma Specifications are subject to change without notice Lenterra Inc e www lenterra com 1 1 pm 1 1 pm 0 9 pm 4 3 pm 0 22 pm 0 17 pm 0 06 pm 0 19 pm 2 Duplex LC PC LOI 4F 40 cm 15 5 30 cm 11 7 10 5 cm 4 2 4 7 kg 10 4 Ibs 100 240 VAC 47 63 Hz From 0 C to 40 C From 10 C to 50 C DFB diode laser 1300 1320 nm 1540 1560 nm lt 10 MHz 3 7 nm 1 3 nm 0 1 nm s from 0 33 nm s to 650 nm s from 0 25 Hz to 500 Hz 1 1 pm 1 1 pm 1 4 pm 7 2 pm 0 22 pm 0 17 pm 0 09 pm 0 31 pm 4 Two Duplex LC PC 10 10 10 V A USB LabVIEW based data acquisition and control software Spectra recording spectra aver
16. ile automatic search is only available before the measurement started e lf the tops of the peak are flat or peak amplitude is comparable to the noise level adjust the height of the peaks with gain adjustment knobs located on the back panel of the interrogator e Make sure the calibration coefficient has the same value as specified in the calibration sheet supplied with a sensor You may adjust the Calibration coefficient by clicking on the Calibration coefficient menu item e When you are ready to start measurements press the Start Measurement button The acquired data will be shown on the plots of the Force or Wall Shear Stress and Temperature tabs Only the latest 2 000 data points are displayed A The erroneous results will be recorded if the FBG peak maxima are not visible on the Real time spectra plot To restore proper measurements the wavelength should be adjusted MANUALLY using the Laser wavelength control on the left panel e When enough data are recorded press the Stop Measurement button After a short delay all recorded data will be displayed on the plots e To save the acquired data click on the Save Data button and choose the location and the name of the file in the Save As dialog window DATA FILE FORMATS When the Save Data button is pressed the program prompts for a filename and location to save acquired data These files are plain text files with settings information and data presented in tab delimited columns Section
17. instrument Ensure that the power cable is plugged in fully and that AC voltage is available from the wall socket The AC power input on the unit is protected with two 3A 250V fuses 5mmx20mm Using a flat head screwdriver the fuse holder located between the power switch and power plug receptacle can be opened to inspect fuse and replace it as necessary e When restart the program the settings are set to default values not the values that were present before the program was last closed The configuration file in which these settings are stored is saved in the software directory in Program Files If the program is run by a user that does not have writing privileges in this directory the program will not be able to save these settings Granting writing privileges to the user for this directory or running the program as Administrator can solve this problem e have a sensor connected but the software is measuring a constant value even when varying shear stress is being applied The DAQ circuitry inside the instrument is powered through the USB bus and will operate even when the unit is powered off Ensure that the unit is powered on to achieve proper measurements e have the program running but no data are shown on the real time spectra plot If you have more than one controller or installed another National Instruments DAQ cards you should choose the Device number corresponding to the controller you use by default it is 1 Enter new value i
18. n the Device number field stop the program and start it again by pressing the button with an arrow located under the menu in the top left part of the program window MAINTENANCE AND STORAGE Make sure that the Duplex LC receptacle is never open for an extended period of time When a sensor is not plugged always cover receptacle with the cup provided Always clean the Duplex LC Optical Plug with a fiber connector cleaner e The interrogator should not be subjected to excessive mechanical force or vibration e ltcanbe stored in a clean dry place where temperature does not fall below 10 C or exceed 50 C LOI xF Interrogator User Manual and Software Guide 13 LENTERRA OPTICAL SENSOR INTERROGATOR Lenterra Optical Sensor Interrogator LOI is a compact robust fast measurement unit designed for the high resolution interrogation of optical sensors Fiber Bragg Grating or Whispering Gallery Mode sensors in laboratory or industrial environments LOI utilizes fast low noise Distributed Feedback diode laser with narrow linewidth for full soectrum scanning Adjustable photodiode gains allow for measurement of returned light intensity in a wide dynamic range LOI is controlled by any standard PC through USB interface The unit can be used with third party FBG or WGM sensors as well as with Lenterra s RealShear and DFF sensors for measurements of such parameters as wall shear stress drag force temperature strain viscosity and ot
19. nalysis Calibration coefficient Find peaks Finish Start measurement Clicking on this menu item will initiate force or wall shear stress and temperature measurements The measurement data will appear on plots in corresponding tabs Only last 2 500 data points are dynamically displayed during data acquisition After being clicked Start measurement menu item caption will change to Stop measurement Clicking it again will stop data acquisition and after short delay all acquired data will be shown on plots Note the function of this menu item is identical to that of the Start Measurement button Analysis Clicking on this menu item will open submenu with available data filters and analysis tools described below This menu is disabled by default and becomes enabled when data acquisition has finished Moving average Selecting this menu item will bring up additional controls on the left panel for applying the moving average filter Calibration coefficient Choosing this menu item will bring up a dialog window with a cell in which the calibration coefficient of the sensor should be entered After pressing the Save button the entered coefficient is saved and data displayed on the force or wall shear stress vs time plot are recalculated Pressing the Cancel button will close the dialog window without saving the calibration coefficient Find peaks Selecting this menu item will initiate the automatic search for the FBG sp
20. tion coefficient Calibration coefficient of the sensor The units are N nm if force is measured or Pa nm if wall shear stress is measured LOI xF Interrogator User Manual and Software Guide 8 LD central current mA The wavelength of the LOI 2F laser diode LD can be changed in two ways by changing the current through the LD faster approach or by changing the LD temperature slower approach To record an FBG spectrum the LD electrical current is periodically varied The mean value of this saw shaped signal is saved in this line of the config ini file IT IS NOT RECOMMENDED TO CHANGE Config ini gt Notepa File Edit Format View Help main i THIS PARAMETER ee ee Let HZ ae Laser wave en on j p cali bration iei yini _1 000000000000 LD current range mA The range of the LD electrical LD centra current mA 7 LD current range mA 110 current modulation IT IS NOT RECOMMENDED TO LD lowest temperature C 5 LD highest temperature C 50 CHANGE THIS PARAMETER what 15 measured Force Dag er be vi2 ctro LD lowest temperature C Low limit for the temperature Input channels Devi2 aid 6 of the laser diode which defines the shortest wavelength PERAE SPA 2 eee eee IT IS NOT RECOMMENDED TO CHANGE THIS AO 44008 08632293 PARAMETER AL 47 3327275509 Az 0 01223842 i E n LD highest temperature C High limit for the 0 1554 6937577 i A H gt 0 0021419459978 temperature o
21. vailable USB 2 0 Port e 2 0 GHz processor or better e 2GBRAM e 500 MB free disk space e 1366x768 screen resolution FRONT AND BACK PANELS Power indicator USB Port Channel 1 Channel 2 Power entry module Gain adjustments Duplex LC Optical Receptacles Front view LOI 4F shown Back view INSTALLATION SEQUENCE e Using the provided DVD Install the interrogator software specific instructions are in the following section of this manual e Plug the supplied power cable into the power entry module on the rear panel of the instrument LOI xF Interrogator User Manual and Software Guide 3 e Plug the supplied USB cable into both the instrument and the PC e Power on the unit with the rear mounted power switch The blue front panel power indicator will light up Note The data acquisition DAQ circuitry inside the instrument is powered through the USB bus and will operate even when the unit is powered off Ensure that the unit is powered on to achieve proper measurements e Connect the RealShear or DFF sensor to the interrogator insert the Duplex LC Optical Plug on the sensor cable to the Duplex LC Optical Receptacle of the interrogator slide the protective collar cap onto the receptacle and rotate clockwise to lock into position Note The connector is keyed for proper orientation do not force the plug into the receptacle e Start the software SOFTWARE The software is developed using NI LabVIEW programming language an
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