Using the 10 and 20 cm Survey Chambers
6-23
Label Description
Time Instrument time.
10s Flux Ten second running estimate of soil CO
2
flux rate.
CO2 Chamber CO
2
concentration in μmol/mol.
CO2 Dry Chamber CO
2
concentration, corrected for water vapor
dilution, in μmol/mol.
H2O Chamber water vapor concentration, in mmol/mol.
Pressure Atmospheric pressure in the optical bench (kPa).
°C (Chamber) Air temperature inside the soil chamber.
°C (Bench) Temperature of the optical bench.
°C (Case) Air temperature inside the Analyzer Control Unit case.
H2O ABS Absorption of photons in the optical bench due to the
presence of water vapor.
CO2 ABS Absorption of photons in the optical bench due to the
presence of CO
2
.
Volts In Input (battery) voltage.
Raw CO2 CO
2
raw signal in sample analyzer.
Raw CO2 Ref CO
2
raw signal in reference analyzer.
Raw H2O H
2
O raw signal in sample analyzer.
Raw H2O Ref H
2
O raw signal in reference analyzer.
RH% Relative humidity inside the soil chamber.
V1 Aux Input at voltage channel 1.
V2 Aux Input at voltage channel 2.
V3 Aux Input at voltage channel 3.
V4 Aux Input at voltage channel 4.
T1 Aux Input at thermocouple channel 1, in degrees C.
T2 Aux Input at thermocouple channel 2, in degrees C.
T3 Aux Input at thermocouple channel 3, in degrees C.
T4 Aux Input at thermocouple channel 4, in degrees C.
CRC Cyclic Redundancy Check (see below)
Strip Remove markup from data (see below)
CRC (Cyclic Redundancy Check) is an algorithm that is used to verify the
integrity of the data. Before each data packet is sent by the LI-8100A, a CRC
is calculated (pre-transmission) for that packet, and then appended to the
packet. When the client (e.g. the computer) receives the packet, it strips off
the appended CRC and calculates its own CRC (post transmission). If the two
CRC values match, it is assumed that the packet was transmitted correctly.
When CRC values are appended to the data packet, the value is automatically
marked up. A typical CRC will appear as
<CRC>3067450353</CRC>
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