C Glossary of Terms
Add CRC to data. CRC (Cyclic Redundancy Check) is an algorithm used to verify
data integrity. Before each data packet is sent from the LI-8100A, a CRC is
calculated (pre transmission) for that packet and appended to it. When the client
receives the packet, it strips off the appended CRC and calculates its own CRC
(post transmission). If the two CRC values match the packet was transmitted OK.
When the CRC values are appended to a data packet, the value is always marked
up. A typical CRC will appear like the following: <CRC>3067450353</CRC>.
The LI-8100A uses the POSIX 1003 definition to compute a 32 bit CRC.
Auto Restart. Causes the instrument to resume an interrupted measurement on
instrument restart.
Bench Temp. Temperature of the optical bench. Labeled Tbench in the data.
Units; °C
Case Temp. Temperature measured inside the system case. Labeled Tboard in the
data. Units; °C
Chamber Offset. Computation of soil CO
2
flux requires an estimate of the total
system volume. The IRGA, chamber and tubing volumes have been determined by
LI-COR. The air volume inside the collar above the soil is an unknown and must
be calculated from the Area and the chamber offset measured as described in
Section 2, Measuring the Chamber Offset. Units; cm.
Chamber Temp. Air temperature inside the chamber. Labeled Tcham in the data.
Units; °C.
Chamber Volume. The volume of the chamber and associated tubing. Labeled
Vcham in the data. Units; cm
3
.
Channel. A range of radio frequencies between 2.4 GHz and 2.5 GHz have been
designated for public use in most countries. The channel refers to a specific
portion of the total frequency range that is given to a device for communication.
The LI-8100A supports channels 1 to 11.
CO
2
. Chamber CO
2
concentration. Units; μmol CO
2
mol
-1
air
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