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(1990) Principles of Environmental Physics second edition. Edward Arnold (Hodder & Stoughton). Norman J M & Welles J M (1983). Radiative transfer in an array of canopies. Agron. J. 63:743-748. Norman J M and Jarvis P G (1975). Photosynthesis in Sitca Spruce (Picea sitchensis (Bong) Carr.) V. Radiation penetration theory and a test case. J. Appl. Ecol., 12:839-878 Russel G, Marshall B and Jarvis P (eds). (1989) Plant Canopies, their Growth, Form & Function. SEB Seminar series 31, CUP, Cambridge Wang Y P and Jarvis P G (1988). Mean leaf angles for the ellipsoidal inclination angle distribution. Agric. For. Meteor., 43:319-321. Welles J M (1990). Some indirect methods of estimating canopy structure. Remote Sensing Reviews 1990 vol 5(1) pp 31 -43. SunScan User Manual v 1.05 LAI theory • •••• 63 Technical Reference section Maintenance and repair Checking the batteries The SunScan system requires batteries within the probe and in the Workabout. The Beam Fraction sensor does not require batteries because it draws its power from the probe. The SunScan probe batteries The probe is powered by 4 AA size alkaline cells mounted within the probe handle. With typical use, these batteries should last from 6 -12 months. The probe circuit automatically "sleeps" when no readings are being taken. There is no probe on/off switch. Checking the probe battery level Connect the probe to the Workabout, and from the SunData program take a reading with the probe (any light reading will do -it is required only to activate the battery sensing circuit). Then press . ....+B (or Menu,Utils,About). The screen display will show various version numbers plus a Battery mV reading. Replace the batteries if the reading is 4700 mV or less. A reading of 5000 mV or above indicates that the batteries are healthy. You will get an on-screen warning if the batteries are low. When this happens replace them as soon as you can. If you get a 0 mV reading, the probe has not been read. Take a light reading, and try . ....+B again. Probe battery life With a fresh set of batteries in the probe, you could take about 300,000 readings. If you took no readings, the batteries would last for about 6-12 months. Warning! If you are likely to store the probe for a long period, you should remove the batteries. Replacing the probe batteries You must dismantle the probe handle. Disconnect the BFS and the probe's RS232 cable. The baseplate of the probe is secured to the handle by 4 cross-head corner screws. Unscrew these to remove the handle, whilst carefully supporting the probe. The battery holder can now be prised out of its compartment, and the batteries changed. The Workabout batteries Checking the Workabout battery levels The Workabout is supplied with a rechargeable Ni-Cd battery pack and a Lithium back-up battery installed. Press Shift+Ctrl+B to display the Psion Battery info screen. You will be warned when the batteries get low. Switch off and recharge the batteries as soon as possible. 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. 64 • •••• Technical Reference section Document code: SS1-UM-1.05 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. A fully charged Ni-Cd battery should easily give 2 or 3 full days use in the field. You must then recharge the Workabout overnight if you want to continue with daily use in the field. Warning! In general, Ni-Cd batteries prefer to be fully discharged before being recharged. Do not leave them continuously trickle-charging. If you ordered a spare Ni-Cd battery pack it will not be charged initially. Charge it as soon as you have the opportunity, so that you can replace an exhausted one without delay. To gain access to the batteries, open the battery drawer by pressing the black button at the top left corner of the Workabout very firmly. The Workabout will run equally well from 2 AA alkaline cells. Carry some of these with you if there is any chance that your Ni-Cd will become exhausted when no mains power is available for recharging. Warning! Don't leave the Workabout without a main battery for more than a day or two. Its back-up cell will last for several days only. Beyond this time you may lose data in the internal memory (but Flashcard data will not be affected). If you get low battery warnings, even after fully charging the Ni-Cd pack, these can be reset by removing and then replacing the pack. Checking the desiccant Both the SunScan probe and Beam Fraction sensor contain desiccant packs to prevent internal condensation of moisture when they are used outside. The dryness of the desiccant is indicated ...

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