User manual
Table Of Contents
- N
- Introduction
- Introduction
- Getting Started
- S
- SunScan Tutorial
- M
- Menus and Screens
- More Psion and file handling notes
- M
- Measurement options
- L
- LAI theory
- Technical Reference section
- Maintenance and repair
- Troubleshooting
- Psion Workabout
- Problems running the SunData application.
- While running SunData
- SunData reports “SunScan probe not connected”.
- SunData recognises the SunScan probe, but fails to take readings.
- On running SunData, all the system settings are scrambled.
- “Out of memory” reported on drive A:.
- “Insufficient power to write data” reported.
- When transferring files to a PC, data is transferred, but there are repeated checksum or device IO errors.
- SunScan or BFS give inconsistent light readings.
- Technical Support
- Specifications
- PAR Performance
- Appendices
- Index
SunScan User Manual v 1.05 Technical Reference section •
••
• 73
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.
SunScan system cosine response
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
0 102030405060708090 0 102030405060708090
SunScan probe Zenith angle ° Beam Fraction sensor
relative response
Ideal
Actual
Actual / Ideal