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