Delta Electronics SS1-UM-1.05 Data memory management, Configuration and data file handling

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If you have other (non-data) files you want to keep, copy them to the internal drive, or to another Flashcard for temporary storage (don't forget to copy them back and delete them immediately afterwards), alternatively copy them to your PC using RCOM or SLINK, or the PsiWin program if you have it.

♦On the Workabout, exit from SunData (if necessary) by pressing ∪ +X.

♦In the System Screen, press Menu, Disk, Format disk, Enter.

Then follow the instructions and prompts carefully.

Warning! Reformatting is an irrevocable process - you will get on-screen warnings that files will be deleted. Also, do not format the Internal drive - you will lose your SunData program!

Data memory management

The memory space taken up by a given number of readings can't be specified exactly because it depends on how many notes have been included, the number of data groups used, whether the file is a .PRN or a .CSV file, and so on. The following estimates will however give you a useful guide when planning experiments.

For the standard 256K Flashcard, about 2500-3000 readings can be stored in the LAI and PAR modes. This reduces to about 400-500 in the All mode, which retains the 64 individual diode values for each reading. The optional 1 Mb Flashcard can accommodate about four times these amounts.

You can check the available memory space on your Flashcard from the Psion system menus as indicated in the previous paragraph. Bear in mind the note about creating space on the Flashcard.

Warning! Don't be tempted to store data files in the internal memory even though it may appear to have plenty of free space. The SunData program uses a lot of this space when running, and will refuse to run without it.

Configuration and data file handling

Opening and closing files in the SunData programs follows a somewhat different routine from that used by applications run in desktop PCs because of the Workabout's Solid State Disks.

Two sorts of files are involved: data files which are used for storing measurements made by the SunScan; and configuration files, in which you can retain the settings of different sites and experiments.

SunData Configuration files

Configuration files contain information on the state of the SunData program, which includes the following Settings menu and readings information:

•SunScan probe and External sensor settings

•Site and local time details.

•Leaf constants (Absorption and leaf angle distribution parameters).

•Display mode for readings (LAI, PAR or All).

•Title and reading Group names.

•The Plot and Sample numbers of the last reading taken.

•The filename, subdirectory and file type (.PRN or .CSV) for data storage.

36 • More Psion and file handling notes

Document code: SS1-UM-1.05

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Contents SunScan SS1-UM-1.05Copyright AcknowledgementsTrademarks CE conformityContents Menus and Screens More Psion and file handling notes Measurement optionsLAI theory Technical Reference sectionAppendices IndexHow to use the manuals IntroductionSunScan Canopy Analysis System Organisation of this manualField accessories SunScan probeBeam Fraction sensor Data Collection TerminalGetting Started Preliminary checksWorkabout and SunScan probe Checking the Workabout hardware Installing the SunData s/w in your PC Installing the s/wSunData s/w Diskette 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 More Psion and file handling notes Navigating Psion directories and screensWorkabout User Guide 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 Default .cfg Creating a configuration fileRestoring a configuration 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 Measurement procedures in the field Probe handling in the fieldProbe GO button Levelling the probeUsing the tripod BFS handling in the fieldUse of the tripod WorkaboutFinding North, and setting the shade ring Levelling the BFSExtension cables, and the location of the BFS PAR calibrations Factory light calibrationChecking the probe/BFS matching Recalibrate optionRoutine maintenance and cleaning Restoring the factory calibrationEffect of the shade ring on the BFS 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 Functions used to model canopy transmission Accuracy of LAI calculationsDiffuse light cosine response sensor 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 Maintenance and repair Technical Reference sectionChecking the batteries SunScan probe batteriesChecking the desiccant Re-setting the factory calibration Checking the PAR calibrationFactory calibration method Troubleshooting Problems running the SunData applicationPsion Workabout While running SunDataInsufficient power to write data reported Technical Support Specifications SunScan Probe Type SS1Beam Fraction Sensor type BF1 Data Collection Terminal type DCT1 Psion WorkaboutCarrying Case type SCC1 Telescopic Tripod type BFT1Spares Kit type SPS1 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 Upgrading the SunScan system SunData PC s/wWorkabout SunData s/w Revision HistoryFile transfer between Workabout and PC Choice of different programsPsiWin 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 SlinkUsing the Workabout Comms application Alternative file transfer mechanismsSending a file to a Communication program Sending a file to a serial printerGlossary Page Index AccuracyIndex Field use 39, 46, 48, 50, 51, 58

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