Delta Electronics SS1-UM-1.05 SunScan Tutorial, About this tutorial, Working with the Workabout

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SunScan Tutorial

About this tutorial

What you will learn

This tutorial takes you step by step through the processes of setting up and taking readings with the SunScan probe, and then transferring the data files to a computer for analysis. It is divided into two parts, each of which should take about 20 to 30 minutes. For the first part you will need access to the Psion Workabout and its User Guide, or to a portable computer if you are using that instead. The second part requires access to the SunScan probe, the Beam Fraction Sensor if it is available, and a computer for collecting and analysing the data files.

Using a portable PC instead of the Workabout

The SunScan can be controlled using either a Psion Workabout or a portable PC computer. The instructions in this tutorial show the specific keypresses and SunData screens for the Psion Workabout, but the layout of menus and the operating principles are broadly similar if you’re using a portable computer instead. Read the sections with the PC logo in the margin.

♦Instructions for you to follow are bulleted like this one.

Working with the Workabout

Powering up

If you haven't already done this in the Getting Started section, you should check that the Workabout has a suitable power supply. This is explained in the introductory section of its manual, page 3 onwards.

♦Press the yellow On/Esc button.

The Workabout screen should become visible.

If not, refer to the Troubleshooting section on page 17 of the Workabout manual.

♦Check the Workabout’s battery status by pressing Ctrl+Shift+B (hold down the grey Ctrl and Shift buttons, then press B).

Navigating around the Workabout

Each time it powers up, the Workabout returns you to the same place in the application you were last working on. Once you’ve got used to it, this is a very useful feature, but it can be quite confusing when you first start. You may be anywhere, in any application, and switching the Workabout off and on again won’t get you back to the start.

♦ Exit any current application by pressing ∪ +X. (Hold down ∪ then press X)

This will take you to the Psion System Screen. You should see a display something like this. (If you can't find the SunData icon, see Getting Started for help).

14 • SunScan Tutorial

Document code: SS1-UM-1.05

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Contents SunScan SS1-UM-1.05Trademarks CopyrightAcknowledgements CE conformityContents LAI theory Menus and Screens More Psion and file handling notesMeasurement options Technical Reference sectionAppendices IndexSunScan Canopy Analysis System How to use the manualsIntroduction Organisation of this manualBeam Fraction sensor Field accessoriesSunScan probe Data Collection TerminalWorkabout and SunScan probe Getting StartedPreliminary checks Checking the Workabout hardware SunData s/w Diskette Installing the SunData s/w in your PCInstalling the s/w What the s/w doesSetting up your PCs COM port Running SunDataWorkabout to PC Communication checksSunScan probe to PC Running SunData in Windows Working with the Workabout SunScan TutorialAbout this tutorial What to do if you get lost Starting SunData in the WorkaboutUsing a PC instead of the Workabout Starting the PC softwareThis page is intentionally blank Setting up a measurement session Working through the menu optionsFile Saving Hot KeysUsing the Emulator mode Taking readingsConnecting the SunScan probe Without a Beam Fraction SensorConnecting the Beam Fraction Sensor Measuring Leaf Area Index without a Beam Fraction Sensor Reviewing your data file AveragesTo the PC Transferring the data file to your PCFrom the Workabout Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout File SettingsMenus and Screens Contd UtilsQuit Workabout User Guide More Psion and file handling notesNavigating Psion directories and screens Navigating the Psion directories and screensPsion subdirectory usage in file select dialogs Flashcards reformatting Re-installing the SunData application iconDeleting unwanted Workabout files Data memory management Configuration and data file handlingSunData Configuration files Restoring a configuration Default .cfgCreating a configuration file Data files.CSV file Displaying data files on your PC.PRN file Data file layouts and data groups Page Above-canopy reference requirements Measurement optionsExperiment design Canopy type and LAI estimates Canopy Sampling volumeCanopy type and BFS practicalities Preferred light and weather conditions Planning for the sun’s positionAbsorption Advice on Absorption and Eladp valuesSetting Eladp Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldLAI, PAR and All displays Workabout setupSunScan System Measurement modes Autolog function Probe GO button Measurement procedures in the fieldProbe handling in the field Levelling the probeUse of the tripod Using the tripodBFS handling in the field WorkaboutExtension cables, and the location of the BFS Finding North, and setting the shade ringLevelling the BFS Checking the probe/BFS matching PAR calibrationsFactory light calibration Recalibrate optionEffect of the shade ring on the BFS Routine maintenance and cleaningRestoring the factory calibration Comparing the calibration with other PAR sensorsEnvironmental and moisture protection SunScan probe and Beam Fraction SensorLAI theory Ingredients of the LAI computation methodTheory versus reality Derivation of Wood’s SunScan canopy analysis equationsMajor assumptions Transmission of Diffuse Light Beers law for canopy absorptionCampbells Ellipsoidal LAD equations Transmission fraction τ Is given by I/I0 Modelling the canopy transmission Diffuse light transmission cosine corrected sensorDetail Diffuse light cosine response sensor Functions used to model canopy transmissionAccuracy of LAI calculations Diffuse light hemispherical response sensorModelling incomplete PAR absorption and scattering Exp 0.1 . x . atan 0.9 Atan L Q SpherSummary Scientific referencesCalculating zenith angles Jones, Hamlyn G Plants and Microclimate second edition. CUP Checking the batteries Maintenance and repairTechnical Reference section SunScan probe batteriesChecking the desiccant Factory calibration method Re-setting the factory calibrationChecking the PAR calibration Psion Workabout TroubleshootingProblems running the SunData application While running SunDataInsufficient power to write data reported Technical Support Beam Fraction Sensor type BF1 SpecificationsSunScan Probe Type SS1 Data Collection Terminal type DCT1 Psion WorkaboutSpares Kit type SPS1 Carrying Case type SCC1Telescopic Tripod type BFT1 Logging CablesPAR Performance Spectral responseCosine responses of probe and BFS SunScan system cosine responseAppendices Logging the probe as a Linear Quantum SensorLogging the Beam Fraction sensor Workabout SunData s/w Upgrading the SunScan systemSunData PC s/w Revision HistoryPsiWin File transfer between Workabout and PCChoice of different programs Workabout Remote LinkExample using Slink Slink and RcomDrives on the PC are referred to as REMA, Remc REM = remote Example using Rcom Documentation of Rcom and SlinkSending a file to a Communication program Using the Workabout Comms applicationAlternative file transfer mechanisms Sending a file to a serial printerGlossary Page Index AccuracyIndex Field use 39, 46, 48, 50, 51, 58

SS1-UM-1.05 specifications

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