Delta Electronics SS1-UM-1.05 Introduction, How to use the manuals, Organisation of this manual

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Introduction

How to use the manuals

This manual tells you how to use your SunScan Canopy Analyser and its accessories. Some pages in the Menus and Screens section are "Quick Guides" which summarise the principal operating modes of the SunScan. They have been laminated on to durable material so that they can be taken into the field instead of the full manual. A separate Technical Manual is provided, but you will only need to refer to it in exceptional circumstances.

If you have purchased the Psion Workabout Data Collection Terminal, you will need to refer to its Workabout User Guide at first, to learn its basic operations. You may also want to refer to your PC User Manual when setting it up to communicate with the SunScan system.

Organisation of this manual

The sections are arranged in a practical order so that you can first of all check the functioning of the equipment you have received, and then learn how to operate it proficiently with the tutorials.

After this, there is a discussion of the measurement options that you must consider when designing your experiments and taking readings in the field. The remainder of the manual covers such things as the theoretical basis for leaf area index estimates, and a technical reference section.

As a new user, you are recommended to work methodically through the Getting Started, and SunScan Tutorial sections. Thereafter you may browse through other parts of the manual as needed.

The SunScan Canopy Analysis System

Here is a brief overview of the main functions and components of the SunScan system.

PAR measurements

Fractional interception and Leaf Area Index estimates

The SunScan probe is a portable instrument for measuring the light levels of photosynthetically active radiation (PAR) in plant canopies. With it, you can measure the interception of solar radiation by the canopy, and – in some types of canopy – make estimates of canopy leaf area index (LAI).

PAR mapping

You can quickly take numerous readings to find the average level of PAR beneath the canopy, for example, or make linear transects of the PAR distribution within the canopy.

Autolog and Linear Quantum Sensor modes

The SunScan probe may also be left unattended to log the variation in PAR at one place throughout the course of a day either in its fully functional Autolog mode, or in its more basic Linear Quantum Sensor mode, connected to a data logger.

6 • Introduction

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 TerminalGetting Started Preliminary checksWorkabout and SunScan probe 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 SunDataCommunication checks SunScan probe to PCWorkabout to PC Running SunData in Windows SunScan Tutorial About this tutorialWorking with the Workabout 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 AveragesTransferring the data file to your PC From the WorkaboutTo the PC Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout Settings Menus and ScreensFile 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 Re-installing the SunData application icon Deleting unwanted Workabout filesFlashcards reformatting Configuration and data file handling SunData Configuration filesData memory management Restoring a configuration Default .cfgCreating a configuration file Data filesDisplaying data files on your PC .PRN file.CSV file Data file layouts and data groups Page Measurement options Experiment designAbove-canopy reference requirements Canopy Sampling volume Canopy type and BFS practicalitiesCanopy type and LAI estimates Preferred light and weather conditions Planning for the sun’s positionAdvice on Absorption and Eladp values Setting EladpAbsorption Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldWorkabout setup SunScan System Measurement modesLAI, PAR and All displays 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 WorkaboutFinding North, and setting the shade ring Levelling the BFSExtension cables, and the location of 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 methodDerivation of Wood’s SunScan canopy analysis equations Major assumptionsTheory versus reality Beers law for canopy absorption Campbells Ellipsoidal LAD equationsTransmission of Diffuse Light 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 SpherScientific references Calculating zenith anglesSummary Jones, Hamlyn G Plants and Microclimate second edition. CUP Checking the batteries Maintenance and repairTechnical Reference section SunScan probe batteriesChecking the desiccant Re-setting the factory calibration Checking the PAR calibrationFactory calibration method 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

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