# LI-6400/XT Help Home
- [LI-6400/XT Help Home](home.md): Product support landing page.
## Instruction Manual
- [Instruction Manual](manuals.md)
- [1. System Description](topics/system-description.md)
  - [The System Components](topics/system-components.md)
- [2. Assembling the LI-6400XT](topics/system-assembly.md)
- [3. Guided Tours](topics/guided-tours-introduction.md)
  - [Before You Start](topics/guided-tours-before-you-start.md)
  - [Tour #1: OPEN Overview](topics/guided-tour-1-overview.md)
  - [Tour #2: New Measurements](topics/guided-tour-2-new-measurements.md)
  - [Tour #3: Controlling Chamber Conditions](topics/guided-tour-3-chamber-conditions.md)
  - [Tour #4: Matching](topics/guided-tour-4-matching.md)
  - [Tour #5: Logging Data](topics/guided-tour-5-logging-data.md)
  - [Tour #6: Configuration Introduction](topics/guided-tour-6-configurations.md)
- [4. Making Measurements](topics/measurements-preparations.md)
  - [Some Simple Experiments](topics/measurements-simple-experiments.md)
  - [Making Survey Measurements](topics/measurements-surveys.md)
  - [Light Response Curves](topics/measurements-light-response.md)
  - [CO2 Response Curves](topics/measurements-co2-response.md)
  - [Matching the Analyzers](topics/matching-the-analyzers.md)
  - [Stability Considerations](topics/stability-considerations.md)
  - [Leaks](topics/leak-considerations.md)
  - [Operational Hints](topics/operational-hints.md)
- [7. Environmental Controls](topics/environment-introduction.md)
  - [OPEN's Control Manager](topics/environment-OPEN-controls.md)
  - [Humidity Control](topics/environment-h2o-control.md)
  - [CO2 Control](topics/environment-co2-control.md)
  - [Temperature Control](topics/environment-temperature-control.md)
  - [Light Control](topics/environment-light-control.md)
- [11. Connecting to a Computer](topics/connecting-introduction.md)
  - [Support Software](topics/connecting-software.md)
  - [Connecting with Ethernet](topics/connecting-ethernet.md)
  - [Connecting with RS-232](topics/connecting-serial.md)
  - [Remote Control](topics/connecting-remote-control.md)
  - [Getting Data From Serial Devices](topics/connecting-data-serial.md)
- [18. Calibration Issues](topics/calibration-issues.md)
  - [CO2 and H2O Analyzers](topics/calibration-irgas.md)
  - [Flow Meter](topics/calibration-flow-meter.md)
  - [Leaf Temperature Thermocouple](topics/calibration-leaf-temp.md)
  - [CO2 Mixer](topics/calibration-co2-mixer.md)
  - [Internal PAR Sensor](topics/calibration-internal-par.md)
  - [LED Source](topics/calibration-led-source.md)
  - [RGB LED Source](topics/calibration-rgb-led-source.md)
  - [Leaf Chamber Fluorometer](topics/calibration-fluorometer-source.md)
  - [GaAsP Light Sensors](topics/calibration-gaasp-sensors.md)
- [19. Maintenance](topics/maintenance-introduction.md)
  - [Chemical Tubes](topics/maintenance-chemical-tubes.md)
  - [Batteries](topics/maintenance-batteries.md)
  - [System Console](topics/maintenance-console.md)
  - [Cables](topics/maintenance-cables.md)
  - [Chamber Handle](topics/maintenance-handle.md)
  - [Leaf Thermocouples](topics/maintenance-leaf-thermocouple.md)
  - [Leaf Chambers](topics/maintenance-leaf-chambers.md)
  - [LED Source](topics/maintenance-led-source.md)
  - [Match Valve](topics/maintenance-match-valve.md)
  - [IRGA](topics/maintenance-irga.md)
  - [CO2 Source](topics/maintenance-co2-source.md)
  - [Shipping the LI-6400](topics/maintenance-shipping.md)
  - [Useful Part Numbers](topics/useful-part-numbers.md)
- [20. Troubleshooting](topics/troubleshooting-introduction.md)
  - [Power On Problems](topics/troubleshooting-power.md)
  - [Real Time Clock](topics/troubleshooting-clock.md)
  - [Warning Messages](topics/troubleshooting-warning-messages.md)
  - [Unreasonable Results](topics/troubleshooting-results.md)
  - [Pump/Flow Problems](topics/troubleshooting-pump.md)
  - [IRGA Problems](topics/troubleshooting-irga.md)
  - [Match Valve Problem](topics/troubleshooting-match-valve.md)
  - [CO2 Mixer](topics/troubleshooting-mixer.md)
  - [Light Source/Sensor](topics/troubleshooting-source-sensor.md)
  - [RGB Source](topics/troubleshooting-rgb-source.md)
  - [Chamber Problems](topics/troubleshooting-chambers.md)
  - [Finding Leaks](topics/troubleshooting-leaks.md)
  - [Useful Information](topics/troubleshooting-information.md)
- [27. Leaf Chamber Fluorometer](topics/fluorometer-introduction.md)
  - [Getting Started](topics/fluorometer-background.md)
  - [Installation](topics/fluorometer-installation.md)
  - [Operational Summary](topics/fluorometer-operating.md)
  - [Using the MPF Protocol](topics/fluorometer-mpf-protocol.md)
  - [Using Xterm and the LCF](topics/fluorometer-xterm-lcf.md)
  - [Basic Experiments](topics/fluorometer-experiments.md)
  - [AutoPrograms](topics/fluorometer-autoprograms.md)
  - [Calibration Issues](topics/fluorometer-calibration-issues.md)
  - [LCF Troubleshooting](topics/fluorometer-troubleshooting.md)
  - [LCF Reference](topics/fluorometer-reference.md)
- [28. Soil CO2 Flux Chamber](topics/soil-chamber-introduction.md)
  - [Considerations for Soil Measurements](topics/soil-chamber-considerations.md)
  - [Attaching the Soil Chamber](topics/soil-chamber-assembly.md)
  - [Software - Soil Chamber](topics/soil-chamber-software.md)
  - [Soil Chamber Measurements](topics/soil-chamber-measurements.md)
  - [Data Files for Soil Measurements](topics/soil-chamber-data-files.md)
  - [Troubleshooting the Soil Chamber](topics/soil-chamber-troubleshooting.md)
  - [Maintaining the Soil Chamber](topics/soil-chamber-maintenance.md)
## Videos
- [Videos](videos.md)
- [Instrument Hardware](videos/hardware-overview.md)
- [Software Overview](videos/software-overview.md)
- [Theory of Operation](videos/theory-of-operation.md)
- [Preparing for Field Season](videos/prepare-for-season.md)
- [Top 10 Tips for Using the LI‑6400XT](videos/top-ten-tips.md)
- [Basic Measurements](videos/basic-measurements.md)
- [Estimate Maximum Fluorescence Yield](videos/estimate-maximum-fluorescence.md)
- [Survey and Response Curve Measurements](videos/response-curves.md)
- [Survey and Response Curve Measurements - Chinese](videos/response-curves-cn.md)
- [Transferring Data](videos/transfer-data.md)
- [Designing a Custom Chamber](videos/designing-a-custom-chamber.md)
- [Insect Respiration Measurements](videos/insect-respiration-measurements.md)
- [Installing the 6400‑09 Soil Chamber](videos/install-soil-chamber.md)
- [Changing the Mixing Fan](videos/changing-mixing-fan.md)
- [Replacing Thermoelectric Coolers](videos/cooler-replacement.md)
- [Installing the Flow Adjustment Knob](videos/flow-adjust-knob.md)
- [Pack the LI-6400 and LI-6400XT for Shipping](videos/pack-for-shipping.md)
## Documents
- [Documents](docs.md)
- [Download Data with a Serial Connection](topics/ttp008-download-data.md)
- [Measuring Canopy-Level Gas Exchange](topics/canopy-gas-exchange.md)
- [Using External Sensors](topics/external-sensors.md)
- [Wireless Connectivity](topics/ttp007-wireless.md)
- [Measuring Narrow Leaves](topics/ttp-narrow-leaf.md)
- [One-sided Leaf Measurements](topics/ttp-one-sided-msmts.md)
- [Making a Stand for your LI-6400](topics/ttp014-stand.md)
- [Packing for Shipping](topics/ttp016-packing.md)
- [Look Ma! No Wires!](topics/ttp018-no-wires.md)
- [Faster Asat Measurements](topics/ttp020-fast-asat.md)
- [Calculating Irregular Leaf Area](topics/ttp021-irregular-leaf-area.md)
- [Dealing with Large, Moist Samples](topics/ttp022-moist-samples.md)
- [Swap Meet](topics/ttp025-swap.md)
- [When Ambient H2O is not Chamber H2O](topics/ttp026-ambient-h2o.md)
- [Overview of the LED Light Source](topics/pps256-light-source.md)
- [Solving an Oily Problem](topics/ttp027-oily-problem.md)
- [Checking the Match Valve](topics/ttp028-match-valve.md)
- [OPEN Software Versions](topics/OPEN-versions.md)
- [Replacing the Battery Connector](topics/ttp047-battery-connector.md)
- [Setting the Thermocouple Height](topics/ttp048-thermocouple-height.md)
- [Battery Datasheet](topics/pps277-battery-datasheet.md)
- [Estimating Light Absorptance](topics/pps264-light-absorbance.md)
- [Controlling CO2 at Low Concentrations](topics/pps267-low-co2.md)
- [Understanding Diffusion Leaks](topics/pps263-diffusion-leaks.md)
- [Chemical Column Maintenance](topics/pps226-tube-maintenance.md)
- [Drying your Drierite](topics/ttp041-drierite.md)
- [Leaf Chamber Gasket Replacement](topics/ttp040-gasket-replacement.md)
- [Buffer Volume: Do I Need It?](topics/buffer-volume.md)
- [Recomputing Older Datasets](topics/ttp-recompute-data.md)
- [Connecting a Soil Moisture Probe](topics/ttp058-soil-moisture-probe.md)
- [Using a Custom Chamber](topics/custom-chamber.md)
- [Using the Whole Plant Arabidopsis Chamber](topics/pps255-wpa-chamber.md)
- [Checking the Mixing Fan](topics/checking-the-fan.md)
- [Mixing fan Replacement Instructions](topics/mixing-fan.md)
- [6400-02B LED Light Source](topics/led-light-source.md)
- [6400-01 CO2 Source Assembly](topics/co2-source.md)
- [6400-05 Conifer Chamber](topics/pps212-conifer-chamber.md)
- [PAM-2000 Adapter and MiniPAM Adapter](topics/pam-adapter.md)
- [6400-07 Needle Chamber](topics/needle-chamber.md)
- [6400-08 Standard Clear Chamber Bottom](topics/clear-chamber-bottom.md)
- [6400-11 Narrow Leaf Chamber](topics/narrow-leaf-chamber.md)
- [6400-14 Opti-Sciences Fluorescence Probe](topics/optisciences-probe.md)
- [6400-15 Arabidopsis Chamber](topics/arabidopsis-chamber01.md)
- [6400-17 Whole Plant Arabidopsis Chamber](topics/arabidopsis-chamber02.md)
- [6400-18 RGB Light Source](topics/pps258-rgb-light-source.md)
- [6400-22 Opaque Conifer Chamber](topics/pps262-opaque-conifer-chamber.md)
- [6400-24 Byrophyte Chamber](topics/bryophyte-chamber.md)
- [6400-34 Needle Holder Kit](topics/pps217-needle-holders.md)
- [6400-37 Thick Gasket Kit](topics/pps270-thick-gasket-kit.md)
- [6400-88 Expanded Temperature Control Kit](topics/expanded-temperature-control.md)
- [6400-89 Insect Respiration Chamber](topics/insect-chamber.md)
- [6400-903 Catch Rod Repair Kit](topics/catch-rod.md)
- [6400-904 Log Switch Replacement Instructions](topics/log-switch.md)
- [6400-907 Air Pump Replacement Instructions](topics/pps219-air-pump.md)
- [9964-033 Tank Connector Block](topics/tank-connector.md)
- [9964-053 Sample Cell Outlet Manifold](topics/pps222-manifold-kit.md)
- [9964-091 Dark Adapting Clip Kit](topics/dark-adapting-clip.md)
- [8100-664 Trace Gas Sampling Kit](topics/pps266-trace-gas-kit.md)
- [250-01885 Leaf Chamber Covering](topics/chamber-film.md)
- [Peltier Cooler Replacement](topics/pps274-peltier-cooler.md)
- [Flow Restrictor Kit](topics/pps244-flow-restrictor.md)
- [Air Passage Spacer](topics/pps241-passage-spacer.md)
- [Memory Board Upgrade](topics/pps224-memory-board.md)
- [200 mHz Digital Board Upgrade](topics/pps236-digital-board.md)
- [400 mHz Digital Board Upgrade](topics/pps250-digital-board.md)
- [Coprocessor Installation](topics/pps210-coprocesser.md)
- [Measuring Photorespiration](topics/ttp-photorespiration.md)
- [Thermocouple Adapter](topics/pps221-thermocouple-adapter.md)
- [Reclaiming Storage Space](topics/ttp-free-storage-space.md)
- [FlashAnalysis Application](Photosynthesis/topics/flash-analysis-application.md)
- [Setting H2O Spans with the DG-4](AppNotes/setting-h2o-span-with-DG4.md)
## FAQs
- [FAQs](faqs.md)
## Software
- [Software](software.md)
## Factory Calibration
- [Factory Calibration](factory-calibration.md)