Delta Electronics SS1-UM-1.05 Restoring the factory calibration, Routine maintenance and cleaning

Page 52

You should not expect to have to do this very often. The photodiodes and light measurement circuits are very stable.

The source of the apparent variability mentioned above is the not quite ideal cosine and spectral response of the sensors.

Restoring the factory calibration

At any time after carrying out the Recalibrate option you can restore the original factory calibration. You do not have to set up the probe or BFS in uniform light.

♦On the Workabout, simply access the Calibrate procedure (∪ +C) and select

Restore Factory calibration.

You will briefly see a message confirming that this has been done.

Effect of the shade ring on the BFS

If the above matching tests are carried out with the shade ring elevated (but not actually casting a shadow on either BFS sensor), you will get different results.

The shade ring blocks about 7% of the diffuse sky light, and none of the direct beam. In bright sun conditions it will have no significant effect on LAI readings. In completely overcast conditions it might contribute a small error of up to 0.1 to the LAI value.

Comparing the calibration with other PAR sensors

You can carry out matching comparisons between the probe and BFS and any other PAR quantum sensor. You cannot reset the probe values to it, but you can annotate the readings and retain the comparison information in the SunScan data files.

Routine maintenance and cleaning

The probe diffuser is Perspex. Clean it when necessary with a damp cloth, moistened with mild detergent, or with IPA (iso propyl alcohol).

The BFS diffusers are also made of Perspex. Clean them very carefully, especially the groove around the diffusers. Use a fine soft brush to remove any dirt or dust from the groove - it could affect the accuracy of the cosine response of the sensors.

The "spread" measurement

The "spread" value is a measure of the relative variation of the light along the probe. This is a useful parameter in light profiling measurements: it is the value of the standard deviation of the 64 photodiode readings, divided by their mean.

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.

52 • 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 TerminalPreliminary checks Getting StartedWorkabout 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 SunDataSunScan probe to PC Communication checksWorkabout to PC Running SunData in Windows About this tutorial SunScan 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 AveragesFrom the Workabout Transferring the data file to your PCTo the PC Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout Menus and Screens SettingsFile 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 Deleting unwanted Workabout files Re-installing the SunData application iconFlashcards reformatting SunData Configuration files Configuration and data file handlingData memory management Default .cfg Creating a configuration fileRestoring a configuration Data files.PRN file Displaying data files on your PC.CSV file Data file layouts and data groups Page Experiment design Measurement optionsAbove-canopy reference requirements Canopy type and BFS practicalities Canopy Sampling volumeCanopy type and LAI estimates Preferred light and weather conditions Planning for the sun’s positionSetting Eladp Advice on Absorption and Eladp valuesAbsorption Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldSunScan System Measurement modes Workabout setupLAI, 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 WorkaboutLevelling the BFS Finding North, and setting the shade ringExtension 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 methodMajor assumptions Derivation of Wood’s SunScan canopy analysis equationsTheory versus reality Campbells Ellipsoidal LAD equations Beers law for canopy absorptionTransmission 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 SpherCalculating zenith angles Scientific referencesSummary Jones, Hamlyn G Plants and Microclimate second edition. CUP Maintenance and repair Technical Reference sectionChecking the batteries SunScan probe batteriesChecking the desiccant Checking the PAR calibration Re-setting the factory 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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