Delta Electronics SS1-UM-1.05 Measurement procedures in the field, Probe handling in the field

Page 48

Battery and memory management

When leaving the SunScan probe to Autolog over a few days, the memory space on the Flashcard will determine how long it can run for, provided the Workabout Ni-Cd battery is fully charged, and the probe alkaline batteries are not near the end of their life. Approximate indications of data memory requirements are given in the earlier Data memory management section.

Warning! If you leave the Workabout in the field for Autologging, you must enclose it in a bag or container with plenty of desiccant to protect it from the possibility of internal condensation. If you are using the Beam Fraction sensor as well during the Autolog process, bear in mind that the shade ring may need occasional readjustment.

Measurement procedures in the field

Of course it is worth checking the equipment a day or two before your field experiment for routine matters such as the state of the batteries and the internal desiccant. See the Technical Reference section for details of these.

Probe handling in the field

Earlier sections in the SunScan User Manual (Measurement options and experiment design) give you guidance as to what equipment you will need (BFS or not) and what types of measurement you will make (LAI, PAR, or All). This section helps with practical comments and advice.

The probe GO button

The red button on the probe handle allows you to initiate and store repetitive readings from the probe without needing to look at the Workabout display. Listen for the tones from the Workabout which tell you where you are in the process:

•single beep - initiate READ

•double beep - accept STORE

The GO button functions just like the Enter button on the Workabout, for all menu options that are presented at the bottom of the screen.

Levelling the probe

The probe is fitted with a miniature bubble level to help you hold it level during the measurements.

In most situations beneath the canopy, exact levelling of the probe is not critical.

Do your best to minimise your own shading of the probe when taking readings. If the probe can "see" you, you will be blocking a certain amount of diffuse light from the sky. Casting a dense shadow on the probe by blocking the direct beam could cause significant errors.

Your best strategy will be to take as many samples as quickly as you can rather than aim for perfection with each reading. This will counter the spatial variability of most canopies, and is especially true if you have to work in unsteady light conditions.

When using the GO button, concentrate on getting the best levelling for the READ function (single beep) which then "freezes" the reading. It does not matter whether the probe is level when you press GO the second time to store the reading.

48 • Measurement options

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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