CPEC300/306/310 Closed-Path Eddy-Covariance Systems
36
If the CPEC300-series system was ordered with the CR6 factory installed, the
system is shipped with the
EasyFlux DL CR6CP
program installed. For users
that will install a previously purchased CR6 into a CPEC300-series system or
for wiring of the optional sensors mentioned above, refer to Appendix
Wiring the CR6 and Optional Energy Balance Sensors
(p. C-1)
6.1 Operation
Operating the
EasyFlux DL CR6CP
requires the user to enter or edit certain
constants and input variables unique to the program or site. Constants are
typically edited only once when first initializing the program. Site-specific
variables are edited upon initial deployment, but also periodically as site
conditions change (e.g., canopy height is a variable that may need to be
adjusted throughout a growing season). Section
(p. 36)
, gives
details on editing constants, and Section
(p. 43)
, gives
details on editing variables.
Typical operation also includes periodic zeroing and spanning of the EC155
, provides more details on zeroing
and spanning, either manually for the CPEC300 and CPEC306, or
automatically with the CPEC310.
6.2 Set Constants
6.2.1 Categories of Constants
To begin program operation, the values for constants should be set or verified.
lists all of the constants with descriptions. Generally, the constants
fall into four categories:
Program Function Constants
These are constants that determine the timing of code execution, frequency of
writing to output tables, memory allocation, etc. In most cases, the default
constants for these values can be maintained.
Sensor Selection Constants
All sensor selection constants begin with the prefix
SENSOR
. The value is set
to -
1
as
TRUE
in the constant table if the system includes the sensor. For
example, if a system has a fine-wire thermocouple, the constant
SENSOR_FW
should be set to -
1
as
TRUE
. When set to
TRUE
, the wiring in TABLE
will apply to the sensor and the data from that sensor will be included in the
data output tables.
If a sensor is not used, ensure the constant is set to
0
as
FALSE
.
Sensor Quantity Constants
The value for these constants indicates the number of each type of sensor in the
system. For example, if four soil heat flux (SHF) plates were being used, the
constant
NMBR_HFP
would be set to
4
.
Sensor Calibration Constants
Some sensors have unique parameters for their measurement working
equations (e.g., multipliers and/or offsets for linear working equations) that are
used to convert their raw measurements into the values applicable in analysis.
Typically, these parameter values are found on the calibration sheet from the
sensor’s original manufacturer. For example, if an NR-LITE2 net radiometer is
Содержание CPEC300
Страница 1: ...CPEC300 306 310 Closed Path Eddy Covariance Systems 10 18 Copyright 2018 Campbell Scientific Inc ...
Страница 17: ...CPEC300 306 310 Closed Path Eddy Covariance Systems 8 FIGURE 4 8 CPEC306 system ...
Страница 54: ...CPEC300 306 310 Closed Path Eddy Covariance Systems 45 ...
Страница 55: ...CPEC300 306 310 Closed Path Eddy Covariance Systems 46 ...
