6-16
Using the 10 and 20 cm Survey Chambers
Measurement Type
The Measurement Type field allows you to toggle between Chamber
measurements and Continuous measurements. Continuous measurements are
used with the optional 8100-405 CO
2
Mapping Kit to map CO
2
concentrations across any transect of interest. In Continuous mode, a single
measurement of up to 24 hoours can be made. Data collected in Continuous
mode are formatted differently than those collected with a soil chamber. The
data lack headers and footers included in the standard .81x file format, and
are instead formatted as comma-delimited text (.csv file format). Much of the
functionality of the soil flux measurement protocol is disabled (e.g.
observation length, dead band, etc.) in Continuous mode, as these features
have no application for continuous measurements. Refer to the 8100-405
Instruction Manual for more information.
Obs. Length
The Observation Length is the time period from the instant the chamber is
closed until just before it begins to open again, and includes the specified
Dead Band period. At low to moderate CO
2
fluxes an Observation Length of
90 to 120 seconds is usually adequate.
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