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AccuPAR LP-80
Decagon Devices AccuPAR LP-80 User Manual
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Ac
c
u
P
A
R
P
AR/LAI ceptometer
model
LP-80
Operator’
s Manual
Ve
r
s
i
o
n
1
0
Decagon De
vices, Inc.
2
Table of Contents
Default Chapter
3
Table of Contents
3
1 Introduction
6
Customer Service and Tech Support
6
Warranty
7
Seller's Liability
7
Repair Instructions
8
2 About the LP-80
9
Specifications
9
Overview of the LP-80
10
Components of the LP-80 System
11
Features
11
Keyboard Operation
12
Turning on the Instrument
13
3 Definitions
15
Par
15
Tau (T)
16
Lai (L)
16
External Sensor
16
Zenith Angle (Z)
17
Fraction of Beam Radiation (Fb)
17
Leaf Distribution Parameter (X)
18
4 PAR/LAI Menu
20
Taking Measurements
20
5 Log Menu
24
6 Data Menu
26
View
26
Download
27
Erase
32
7 Utility Software
33
Downloading Data
33
Erasing Data
36
Setting the Date and Time
37
Viewing LP-80 Information
37
The Preferences Menu
38
Software and Firmware Updates
40
8 Config Menu
41
9 PAR and LAI Theory
48
PAR (Photosynthetically Active Radiation)
48
Average and Intercepted PAR
48
Using PAR to Determine Leaf Area Index
54
Extinction Coefficient & Canopy Structure
57
LAI Measurements & Non-Random Distribution
65
Zenith Angle and Equation of Time
69
10 Measurement Tips
74
Above Canopy (External) Sensor
74
Sample Size
75
Clumping in Canopies
75
LAI Sampling in Row Crops
75
11 Care and Maintenance
78
Batteries
78
Cleaning the Probe and Controller
78
Re-Calibration
79
General Precautions
79
Declaration of Conformity
81
Appendix A: External Sensor Information
82
Specifications
82
Spectral Response
82
Cosine Response
83
Long-Term Stability
83
Appendix B: Troubleshooting
84
Appendix C: Further Readings
94
Index
101
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Decagon Devices AccuPAR LP-80 Specifications
General
Brand
Decagon Devices
Model
AccuPAR LP-80
Category
Measuring Instruments
Language
English
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