Delta SS1-UM-1.05 User Manual
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Delta SS1-UM-1.05 User Manual

Delta SS1-UM-1.05 User Manual

Canopy analysis system
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SS1-UM-1.05

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  • Page 1 SunScan Canopy Analysis System User Manual SS1-UM-1.05...
  • Page 2 Notices Copyright All rights reserved. Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Delta-T Devices Limited. Under the law, copying includes translation into another language. Copyright © 1996, Delta-T Devices Limited. SunData software and canopy theory are Copyright ©...

  • Page 3: Table Of Contents

    Contents Introduction ...6 How to use the manuals ... 6 The SunScan Canopy Analysis System ... 6 Getting Started ...8 Preliminary checks ... 8 Installing the SunData s/w in your PC... 10 Running SunData... 11 Communication checks:... 12 Running SunData in Windows ... 13 SunScan Tutorial ...14 About this tutorial ...
  • Page 4 Modelling the canopy transmission... 58 Accuracy of LAI calculations ... 60 Diffuse light - cosine response sensor ... 60 Diffuse light - hemispherical response sensor..60 Modelling incomplete PAR absorption and scattering... 61 Calculating zenith angles ... 62 Summary... 62 Document code: SS1-UM-1.05...
  • Page 5 Maintenance and repair ... 64 Troubleshooting... 67 Technical Support... 69 Specifications ... 70 PAR Performance ... 72 Appendices...74 A. Logging the probe as a Linear Quantum Sensor ... 74 B. Logging the Beam Fraction sensor... 75 C. Upgrading the SunScan system... 76 D.

  • Page 6: Introduction

    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. Introduction Document code: SS1-UM-1.05...

  • Page 7: Sunscan Probe

    SunScan probe The light sensitive “wand” of the probe is 1 metre long, containing 64 photodiodes equally spaced along its length. The probe handle contains batteries and electronics for converting the photodiode outputs into digital PAR readings, which get sent to your Data Collection Terminal via the RS232 link.

  • Page 8: Getting Started

    (this will escape from any menus). On/Esc , that is: hold down the grey Psi key dialog press . If you can't find the SunData application icon, it may have and press . (This will exit from Exit System Document code: SS1-UM-1.05...

  • Page 9: Checking The Workabout Hardware

    After some minutes of inactivity, the Workabout screen will automatically blank itself to save power. Press Now connect the SunScan probe to the RS232 port at the top of the Workabout. Leave the BFS sensor disconnected. Press the yellow arrow keys to select the SunData icon.(A black background appears round the selected icon label.) Press the yellow The SunData opening screen should...

  • Page 10: Installing The Sundata S/W In Your Pc

    Simply delete all the directories and files that you copied on to your hard disk. Getting Started README file in the root directory of the diskette, please read . At the same time, you should create another directory for \SUNSCAN \SUNSCAN\SSDATA. You may choose alternative Document code: SS1-UM-1.05...

  • Page 11: Running Sundata

    Running SunData The program you will run is diskette). This will be a quick test just to obtain the opening SunData screens on your PC. From DOS Change to the directory on your hard disk which holds the At the DOS prompt, type: The opening SunData screen will appear.

  • Page 12: Communication Checks

    Workabout, this is dealt with in the appendices. Getting Started again. option will be activated, and the screen will change to report the Alt+F then , or Alt+Q then Return Enter Alt + the highlighted letter Document code: SS1-UM-1.05...

  • Page 13: Running Sundata In Windows

    Running SunData in Windows At this stage you may wish to install the SunData program so that it runs from within Windows. In Windows 3.11 The SunData diskette also contains with Windows. In Windows Program Manager, select File, New, Program Item Specify SunScan for the Description, program directory name for the Working Directory, and Icon File.

  • Page 14: Sunscan Tutorial

    Screen. You should see a display something like this. (If you can't find the SunData icon, see Getting Started for help). SunScan Tutorial button. On/Esc buttons, then press Shift (hold down the Ctrl+Shift+B (Hold down then press Document code: SS1-UM-1.05...

  • Page 15: What To Do If You Get Lost

    Warning! If you were already in the Psion System Screen, you’ll see a message System From this point you can launch good idea to familiarise yourself with the Workabout’s keyboard. The main uses of the keys are explained in the Workabout user Guide on pages 10 and 11. The following keys are particularly important for the Workabout: Menu Enter...

  • Page 16: Using A Pc Instead Of The Workabout

    Emulator option field, External Sensor option (it will be field and press <OK> Enter to get the following screen: field. Data from CONTINUE Return Enter and the highlighted Document code: SS1-UM-1.05 option.
  • Page 17 (This page is intentionally blank) SunScan User Manual v 1.05 SunScan Tutorial...

  • Page 18: Setting Up A Measurement Session

    ï ï ï ï and press . Now set the local Enter to between -12.0 and +13.0 ngle to accept names unchanged. ‘Sample’ ‘Plot’ ) have an important effect on the display Ext sensor Document code: SS1-UM-1.05 none ) to...

  • Page 19: File Saving

    You will go through these different combinations later in the tutorial, and there is also a route map in the Menus and Screens section. These settings can be stored as a enables you to switch quickly between the different set-ups necessary at different sites, or when analysing the canopy of different crops with different characteristics.

  • Page 20: Taking Readings

    , and setting the display to Enter twice to take, display and store Current time, and calculated solar angle. Spread of readings from individual photodiodes along the probe wand. Document code: SS1-UM-1.05...

  • Page 21: Without A Beam Fraction Sensor

    Now Set the Display to Settings, Display, Enter The procedure for taking, displaying and storing a reading stays the same, but the reading display and the data stored change to reflect the new setting: This screen is the same if you change the includes readings from all 64 individual photodiodes.

  • Page 22: Connecting The Beam Fraction Sensor

    , so that you store a few .(If you hate beeps, they can be turned off , set the Ext sensor: , and set the display to SunScan probe held level within the canopy being measured. Document code: SS1-UM-1.05 . Press...

  • Page 23: Measuring Leaf Area Index Without A Beam Fraction Sensor

    By now you may have accumulated quite a lot of readings in data file. There is no harm in this, but you may want to put further test results into new file, or maybe try out a few pages back. Measuring Leaf Area Index without a Beam Fraction Sensor This is the most complicated of the combinations of probe and display settings.

  • Page 24: Averages

    Menu, File, Review, Enter to accept it. Enter the arrow keys to step a arrow keys to move to the for the list of hot keys, and other options. Menu .CSV ) data file instead of the default print Document code: SS1-UM-1.05...

  • Page 25: Transferring The Data File To Your Pc

    Select or from the file itself Press This command in fact toggles between the formatted and unformatted states, and the terminology changes accordingly. Press On/Esc Note: if you’re using a portable computer to control the SunScan, the file is fitted into one screen width, and you will be able to see a bigger area of the screen.

  • Page 26: Initiating The File Transfer From The Workabout

    Enter to the next, in sequence. <field> on your PC, or by selecting <Receive> and press . or ( ), for the file transfer dialog box. file illustrated. arrows to select , and type in save as Document code: SS1-UM-1.05...
  • Page 27 You will immediately get a "Sending" message showing the progress of the transfer until it is completed, after which you will be returned to the SunData program. If you have no more to do, you can exit SunData with RS232 comms cable. If the process is not going according to plan, and you suspect problems with the RS232 link, see the section below for help.

  • Page 28: Rs232 Communication Problems

    If you are now keen to think about the practicalities of your next experiment then skip to the section on Measurement Options. If not, you could consolidate your familiarity with the Workabout and its file handling concepts in the next sections. SunScan Tutorial Document code: SS1-UM-1.05...

  • Page 29: Sundata Screens On The Workabout

    SunData Screens on the Workabout SunScan User Manual v 1.05 Note: these screens are only required if you are measuring Leaf Area Index (LAI), and you do not have a Beam Fraction sensor attached to the probe. Note: screen display and data stored will be different from this if the Menu, Settings, Display option is set to either PAR or All instead of LAI.

  • Page 30: Menus And Screens

    0 to 1024 Set the Ellipsoidal Leaf Angle Distribution Parameter, which models the leaf angles within the canopy. 1 corresponds to a random spherical distribution, 0 to vertical, and 1024 to horizontal. Use 1 as default. moves Document code: SS1-UM-1.05...
  • Page 31 Title Settings Titles Group (contd.) Site Site Name Latitude Longitude Local time Time & Date Date Local time is GMT Display: Display 'Sample' name 'Plot' name Restore Utils Calibrate Factory Calibration Recalibrate SunScan Autolog (setup screen) Start Stop Read interval Average interval Ignore...
  • Page 32 Exit the SunData program Quit Menus and Screens Document code: SS1-UM-1.05...

  • Page 33: More Psion And File Handling Notes

    More Psion and file handling notes Navigating Psion directories and screens The Workabout User Guide At this stage you may want to learn more about operating the Workabout, so you should refer again to the Workabout User Guide in which the following subjects are well covered.

  • Page 34: Psion Subdirectory Usage In File Select Dialogs

    Menu for various options. To scroll through other disks, press the yellow left or right arrow This is the root directory of the Internal Disk. To scroll through the list, press the up or down arrow keys. Document code: SS1-UM-1.05...

  • Page 35: Re-Installing The Sundata Application Icon

    To copy to another subdirectory, you must add that information to the filename you choose. If you only put a subdirectory name in the filename field, then the Workabout will use the original filename, but with the new subdirectory. A subdirectory name always starts and ends with “...

  • Page 36: Data Memory Management

    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. More Psion and file handling notes Menu, Disk, Format disk, Enter. Document code: SS1-UM-1.05...

  • Page 37: Data Files

    Default .cfg Every time you exit the SunData program, the program state is stored in the file - Default.cfg which means that you start again exactly where you finished last time. Configuration files can help you if you want to alternate between different sites with different settings.

  • Page 38: Displaying Data Files On Your Pc

    Angle 0.65 46.5 2.7 Notes appear here. 0.65 46.6 0.65 46.6 0.65 46.6 0.65 46.6 LAI: 2.5 Leaf Absorption : Beam Zenith Notes frac Angle 0.37 Beam Fraction measm't 47.5 47.5 47.5 47.5 47.5 0.25 LAI Document code: SS1-UM-1.05...

  • Page 39: Data File Layouts And Data Groups

    Data file layouts and data groups If you want to get a good idea of how the data files will look, you can run the PC SunData program in the emulator mode. The general presentation of the results on screen will be similar to that in the eventual data file. The one major exception to this is in the photodiode readings are listed.

  • Page 41: Measurement Options

    Measurement options Experiment design This section discusses the factors that bear on the experimental objectives you wish to achieve. It should help you answer questions like: What equipment do I need? What readings must be taken? Will I have to wait for particular times of day or weather conditions? The type of study you propose to do will determine the time of year and duration of the experiment, and whether you are interested, for example, in monitoring growth by interception of solar radiation, or perhaps in the canopy structure as well.

  • Page 42: Canopy Type And Bfs Practicalities

    Best, but long cables need management Slower. Needs slow-changing light conditions Good when possible. Checking BFS shade ring difficult. Needs steady light conditions. Clearing light may be partly shaded. Needs slow-changing light, and possibly time average readings. LAI readings not available. Document code: SS1-UM-1.05...

  • Page 43: Preferred Light And Weather Conditions

    This means that in strong sun (high Beam Fraction) the canopy volume sampled is fairly small and well defined. As the Beam Fraction decreases, the volume sampled increases, and has less well defined limits. Preferred light and weather conditions These also will significantly influence your field operations. Limitation Time of day Solar zenith angle...

  • Page 44: Advice On Absorption And Eladp Values

    If you are unable to estimate the ELADP any other way, set ELADP to 1.0. You can check how much this affects your results in the field by making several measurements in one place within a canopy using different ELADP values, and comparing the LAI values calculated. Measurement options Document code: SS1-UM-1.05...

  • Page 45: Relationship Between Mean Leaf Angle And Eladp

    Estimating ELADP in the field If the canopy shows a clear predominance of horizontal or vertical leaves, then choose a small volume of the canopy that is representative. Count the number of leaves that are at more than 45° from the vertical (i.e. mostly horizontal), and the number of leaves that are less than 45°...

  • Page 46: Sunscan System Measurement Modes

    You can only view these in the File, Review screen, or after transferring the data file to your PC (but they can be viewed with a PC connected directly to the SunScan probe instead of the Workabout). Measurement options Document code: SS1-UM-1.05...

  • Page 47: The Autolog Function

    The Autolog function You can set up the SunScan system to operate automatically in any of its modes, just as if you were pushing the read, store and average buttons at regular intervals. Note: don't confuse Autolog with logging the probe as a Linear Quantum sensor, or with logging the Beam Fraction sensor as an independent sensor.

  • Page 48: Measurement Procedures In The Field

    Measurement options READ STORE button functions just like the Enter button, concentrate on getting the best levelling for the the second time to store the reading. button on the Workabout, for all menu Document code: SS1-UM-1.05 READ...

  • Page 49: Bfs Handling In The Field

    Levelling is most critical when you are using the probe: for the incident radiation above the canopy, and when then direct solar beam is strong, and when the sun is low in the sky. Use of the tripod The probe base has a standard camera mount socket for use with the tripod. You will probably not want to use this routinely, but you could use it, for example, to mount the probe in one fixed position for taking readings in the Autolog mode during the course of a day.
  • Page 50 Very long cable lengths may introduce a small systematic error in BFS readings. Up to 100 metres, this should not be significant (< 10 mol.m could add about 20 mol.m adjustment . Measurement options to the readings, which may need subsequent Document code: SS1-UM-1.05 ). At 200 metres it...

  • Page 51: Par Calibrations

    PAR calibrations This section describes the basis for the light calibrations used in the SunScan system, and explains when and how you might want to recalibrate the probe or restore its factory calibration. Factory light calibration The SunScan probe and Beam Fraction Sensor are calibrated to give PAR readings which match those of a standard PAR quantum sensor in typical bright daylight conditions.
  • Page 52 You can check the probe uniformity of calibration at any time by taking a reading in uniform light. The spread value should be 0.00 or 0.01. Measurement options option you can restore the original Recalibrate procedure ( Calibrate Document code: SS1-UM-1.05 ) and select...

  • Page 53: Environmental And Moisture Protection

    Environmental and moisture protection You should be aware of the different levels of protection of the components of the SunScan system to avoid putting them at risk when working outdoors. As with all field instruments you should minimise, as far as practical their exposure to high or rapidly changing temperatures.

  • Page 54: Lai Theory

    By integrating the "black leaf" analysis into a computer model Wood has calculated the light levels in the canopy across the whole range of canopy and incident light parameters. LAI theory Document code: SS1-UM-1.05...

  • Page 55: Derivation Of Wood's Sunscan Canopy Analysis Equations

    Equation fitting and inversion The results of the computer modelling, while accurate, are not suitable for use in a field instrument. It takes many minutes of processing on a fast PC to calculate light transmission for any given conditions using the model, and the Psion Workabout is not a fast computer!.

  • Page 56: Beer's Law For Canopy Absorption

    Ellipsoidal Leaf Angle Distribution Parameter, or , is calculated as follows: tan( ) 0.708 1.702 ( 1.12 is the canopy LAI. is given by: and the semi =, and tan ( ) is expressed tan( ) Ext'n Coeff't Document code: SS1-UM-1.05 a beam...
  • Page 57 The next section derives the transmission of light from a uniform overcast sky through a uniform infinite canopy of black leaves of constant LAI with an ellipsoidal leaf angle distribution. Let the sky have uniform brightness of 1 per steradian over the hemisphere. The radiance of a strip around the sky at angle is given by: sin( ) d and the irradiance on a horizontal surface due to that strip is given by...

  • Page 58: Modelling The Canopy Transmission

    The remainder is re-emitted uniformly in all directions. LAI theory Transmission fraction diff ( , 0 L diff ( , 1 L diff ( 1000 L 0.01 0.001 vertical spherical horizontal Leaf Area Index (absorption) is totally Document code: SS1-UM-1.05...
  • Page 59 In detail: The canopy is divided into horizontal layers of LAI 0.1 Direct beam absorption by each layer is calculated using Campbell's equation. In calculating the amount of absorbed light that is re-emitted, the total power in the direct beam has to be used (i.e. as measured by an integrating hemisphere or a cosine-corrected sensor perpendicular to the beam).

  • Page 60: Accuracy Of Lai Calculations

    ( ) exp( 1.38 0.15 x 0.007 4.32 2.60 exp( 2.75 x 0.57 0.23 exp( 1.40 x C( ) x B ( ) x L , with a maximum 6% error for diff = 0 to 1000. Document code: SS1-UM-1.05...

  • Page 61: Modelling Incomplete Par Absorption And Scattering

    This was again calculated numerically and curves fitted to the data with similar accuracy as above. The curves fitted are: Given: spher ( , x L Diffuse light transmission (hemispherical response sensor) Leaf Angle Distribution Vertical Spherical Horizontal Modelling incomplete PAR absorption and scattering Radiation models have been used for many years to calculate the effects of scattering in the canopy e.g.

  • Page 62: Calculating Zenith Angles

    , the LAI of a canopy of black leaves assuming incomplete is the leaf absorptivity in the 1.5 x 0.7 zen 0.2 zen C( ) x B ( ) x L a Document code: SS1-UM-1.05 ith angle for near 0 Direct part Diffuse...
  • Page 63 Daughty, Craig S T (1990). Direct measurements of canopy structure. Remote Sensing Reviews 1990 vol 5(1) pp 45 - 60. Diffey B L (ed).(1989) Radiation Measurement in Photobiology. Academic Press. Goudriaan J (1977). Crop Micrometeorology: A Simulation Study. Centre for Agricultural Publication Documentation, Wageningen, Netherlands.

  • Page 64: Technical Reference Section

    For full details on the care and maintenance of the Workabout's batteries you should refer to the Workabout User Guide pages 2-5, but the following brief notes will get you started. Technical Reference section ). The screen display will show various Menu,Utils,About Shift+Ctrl+B to display the Psion Battery info Document code: SS1-UM-1.05...

  • Page 65: Checking The Desiccant

    Workabout battery management When you receive the Workabout, the installed battery pack may not be fully charged. Connect the Workabout to the Docking unit and Charger immediately, so that charging can proceed whilst you are learning to use the SunScan. The charger is a trickle-charger and may take 14 hours to fully recharge the battery pack.

  • Page 66: Checking The Par Calibration

    Beam Fraction sensor with badly matched Total and Diffuse outputs, or a SunScan probe with an out-of-spec calibration, or individual diode readings that appear faulty, please refer back to your agent or the factory. Technical Reference section procedures. Document code: SS1-UM-1.05 recalibrate...

  • Page 67: Troubleshooting

    Troubleshooting Psion Workabout There is no SunData Icon in the system screen. From the Psion system screen, select Sundata.app copied from the SunScan program disk - refer to the appendix: File Transfer between Workabout and PC. The system fails to recognise a Flashcard in the A: or B: drives. Make sure the SSD drawer is firmly closed.
  • Page 68 SunScan Tutorial (p28). SunScan or BFS give inconsistent light readings. Make sure the diffusers are clean and that the desiccant condition indicators are blue. See the advice on PAR calibration in Measurement Options (p49). Technical Reference section Document code: SS1-UM-1.05...

  • Page 69: Technical Support

    Technical Support Distributor contact If you have a problem, please call your local distributor first. Direct Delta-T contact You can contact SunScan Technical Support at Delta-T directly on: Tel: +44 (0)1638 742922 Fax: +44 (0)1638 743155 Email: fi42@delta-t.co.uk Web site: http://www.delta-t.co.uk/users/fi42 Guarantee The SunScan system and its components are guaranteed for one year against defects in manufacture and materials.

  • Page 70: Specifications

    Flashcards, 256k or 1Mb - effectively unlimited a) LAI b) PAR average c) ALL individual sensor readings IP 54, RH 0%...90% non condensing, -20°...60°C 1 m onto concrete Ni-Cd pack (up to 15 hours per charge) or 2 x AA Alkaline cells Document code: SS1-UM-1.05...

  • Page 71: Carrying Case Type Scc1

    Carrying Case type SCC1 Moulded plastic case with O-ring seal for moisture and dust proofing, including pressure release valve. Outside dimensions Weight Telescopic Tripod type BFT1 3-way head with quick release platform. Geared friction elevator control. Locking leg catches and brace. Dual Spike/rubber feet. Max.

  • Page 72: Par Performance

    However, if you are working under artificial or strongly coloured light you should check the SunScan readings against an accurate PAR sensor if you need to know absolute PAR levels. Technical Reference section Spectral response w avelength nm SunScan Ideal Document code: SS1-UM-1.05...

  • Page 73: Cosine Responses Of Probe And Bfs

    Cosine responses of probe and BFS The cosine response curves show a diminishing response compared to the ideal at high zenith angles. For this reason, you should avoid taking measurements when the sun is strong and near the horizon. Most studies will be looking at the ratio of incident and transmitted light, and the graph shows the SunScan and Beam Fraction sensor are very closely matched in their cosine and spectral responses, so the small deviations from the ideal will not introduce significant errors.

  • Page 74: Appendices

    V+ Power supply positive Sensor power positive (switched for warm-up) 0V Power supply negative Sensor power negative (0V) Signal output positive Input channel + LO Signal output negative Input channel - not used Screen Not connected (see below) Document code: SS1-UM-1.05...

  • Page 75: Logging The Beam Fraction Sensor

    B. Logging the Beam Fraction sensor You can log the Beam Fraction sensor in a similar manner, using the (optional) special logging cable for it. Two outputs are available, corresponding to the Total incident PAR and Diffuse PAR photodiode readings. Be aware that the shade ring elevation may need readjustment after an hour or two.

  • Page 76: Upgrading The Sunscan System

    If you are unsure about the status of your equipment, please refer to the earlier Technical Support section of this manual for how to locate version and serial numbers, then contact your agent or Delta-T. Appendices Document code: SS1-UM-1.05...

  • Page 77: File Transfer Between Workabout And Pc

    D. File transfer between Workabout and PC Choice of different programs For the transfer of data files from the Workabout to a PC, the SunData software that resides in the Workabout and on your PC provides all you need, but it is specific for this purpose.

  • Page 78: Slink And Rcom

    SLINK into a directory called SunData.app needs to run from a subdirectory and press Enter , and the . Press Port Enter SLINK.EXE C:\SUNSCAN\PSION on the Internal drive. You \SUN\ Document code: SS1-UM-1.05 . Set the to accept. on your...
  • Page 79 From the Psion System Screen, press Press Note: the Workabout refers to its own drives as drives on the PC are referred to as If no subdirectory Select Press For Dir. Name type Access the directories again with The new subdirectory Internal Disk.

  • Page 80: Example Using Rcom

    , and set it to and press Enter , and the Port , type: RCOM.EXE RCOM directory) are mapped onto drives Internal sys$8087.ldd , which is and confirms the \SUN\ RCOM then press Off, Enter. Document code: SS1-UM-1.05 . Set the...

  • Page 81: Alternative File Transfer Mechanisms

    E. Alternative file transfer mechanisms Sending a file to a Communication program You can send your files to a communications program such as Windows Terminal or ProComm. However, if you do this there will be no error checking during the file transfer.

  • Page 82: Glossary

    Leaf Area Index (LAI) - the surface area of leaf per unit of ground area (assuming leaves are flat, and including only one side of each leaf). Instruments like the SunScan cannot differentiate between leaf and stem, so could more correctly be said to estimate Plant Area Index. Appendices Document code: SS1-UM-1.05...
  • Page 83 Local time - the time used in your particular time zone. It varies from GMT by an amount depending on longitude, political boundaries, and any daylight saving time. Mean Leaf Angle (also Mean Tip Angle, Mean Inclination Angle) is the average angle of all the leaf elements relative to the horizontal, weighted according to area.

  • Page 84: Index

    ... 26 Files, Psion deleting ... 34 Flashcard ... 7, 34, 65 Format CSV ... 25, 30 Fractional interception ... 6 GMT... 18, 80 GO button... 12, 46 Group number... 38 title... 38 Guarantee ... 67 Document code: SS1-UM-1.05...
  • Page 85 Hemispherical response...58, 80 Hot keys ...19, 32 Inversion...53 LAI, display...44 LAI, theory...52 Latitude ...18 Leaf absorption...80 Leaf Angle Distribution...80 Leaf Area Index...6, 80 Levelling ...22, 46 Light conditions preferred ...41 sun position...41 Linear Quantum sensor...6, 72 Local time...81 Logging BFS...73 cables ...69 Probe...72 Longitude ...18...
  • Page 86 Windows, running SunData... 13 Wood's SunScan equations... 53 Workabout... 8, 47, 65 charger ... 9 COMMS ... 79 hardware ... 9 keys... 15 screens ... 29 setup ... 44 Zenith angle... 60, 81 Solar Predictor... 41, 60 Zoom ... 30 Document code: SS1-UM-1.05...

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