Operating Instructions
Table of Contents
The Basics
| 1 | Introduction to the LI-6800 |
What it is, what it does, and how it does it
| 4 | Working with data |
Data files, results, and configuration information
System Tests, Troubleshooting, and Maintenance
| 5 | System tests and messages |
Trying to get your attention
| 6 | Troubleshooting |
When things go wrong
The log button on the head does not work
CO2 cartridge exhausts quickly
Issues with environmental controls and setpoints
Cannot control the fluorometer output
Fluorometer does not flash on log
Chamber and light source warning messages
| 7 | Maintenance and calibration |
The difference between data and good data
The Fluorescence System
Chlorophyll a fluorescence analysis
| 8 | Measuring chlorophyll a fluorescence |
Fluorometer theory and equation summary
Installing the fluorometer chamber
| 8.1 | Fluorescence measurement examples |
Determine Fv/Fm and quenching coefficients
An induction kinetics measurement
Additional fluorescence measurements
| 8.2 | Optimizing flash settings |
| 8.3 | Fluorescence analysis tools |
Monitoring real-time fluorescence
| 8.4 | Custom flash events |
Custom event parameter reference
| 8.5 | Meta commands |
| 8.6 | Fluorometer events file structure |
| 8.7 | Fluorometry timing details |
| 8.8 | User-defined meta extras |
| 8.9 | Maintaining the fluorometer |
| 8.10 | References for chlorophyll fluorescence |
Leaf Chambers, Light Sources, and Accessories
Using leaf chambers and light sources
| 9 | Measuring leaf-level gas exchange |
Gas exchange theory and equation summary
Installing the small leaf chamber
| 9.2 | Matching the IRGAs |
Match information in data files
Range match information storage
| 9.5 | More chamber options |
Installing the large leaf chamber
Using two light sources simultaneously on the LI-6800
| 9.6 | Maintaining chambers and light sources |
The Aquatic Chamber
Using the 6800-18 Aquatic Chamber
| 10 | Measuring assimilation from aquatic samples |
Aquatic theory and equation summary
Installing the Aquatic Chamber
Aquatic chamber software controls
| 10.1 | Preparing for measurements |
Measuring the response time of blank media
Light transfer and reported light intensities
| 10.2 | Measurement examples |
A basic photosynthesis irradiance response measurement
Measuring PI response using a program
Measuring PI response with a Background Program
| 10.3 | More options |
Controlling temperature with a water bath
Measuring the subsample loop flow rate
Using auxiliary channels with the aquatic chamber
| 10.4 | Troubleshooting the aquatic chamber |
| 10.5 | Maintaining the aquatic chamber |
| 10.6 | References for aquatic photosynthesis |
The Soil Chamber
Using the 6800-09 Soil Chamber
| 11 | Measuring soil CO2 flux |
Soil chamber theory and equation summary
Connecting external soil sensors
Soil chamber software controls
| 11.1 | Preparing for measurements |
| 11.2 | Troubleshooting the soil chamber |
| 11.3 | Maintaining the soil chamber |
Trace Gas Analysis
Photosynthetic trace gas analysis with the LI-6800
| 12 | Using the LI-6878 Leaf Trace Gas Integration System |
Installing the Leaf Trace Gas Integration System
| 12.1 | Operational guidelines |
Example: Measuring the light response
Example: Measuring the CO2 response
| 12.2 | TGA files and variables summary |
User I/O controls and the TGA interface box
Background program tools for TGA
| 12.3 | References for trace gas analysis |
An Introduction to Programming the LI-6800
"Cry 'Havoc!' and let slip the dogs of war."
| 13 | Using Background Programs |
| 13.1 | Overview of Background Programs |
Creating custom interface dialogs
| 13.2 | Example Background Programs |
Record and replay a time series
| 13.3 | Response curve Background Programs |
| 13.4 | Background Program screen reference |
| 13.5 | Step reference |
| 13.6 | The list_utility module |
| 13.7 | Controlling custom events from a BP |
Instruction Manuals
NEW! Using the LI-6800 Portable Photosynthesis System v2.2
(6800_v2.2-Manual_19739.pdf)
Instruction manual for the LI-6800 Portable Photosynthesis System running software version 2.2. This edition includes full theory and operating information for all LI-6800 chambers and applications, including leaf chamber, the fluorometer, the soil chamber, the aquatic chamber, the LI-6878 Leaf Trace Gas Integration System, and accessories. It provides an introduction to programming the LI-6800 as well.
NEW! What's new in version 2.2
For people who are familiar with prior versions of the software and manual, this document summarizes the new features and how to use them.
(6800_QuickStart_15836.pdf)
Quick start guide for the LI-6800 Portable Photosynthesis System.
Using the LI-6800 Portable Photosynthesis System v1.5
(6800_Manual_15834.pdf)
Instruction manual for the LI-6800 Portable Photosynthesis System running software version 1.5.