Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 77)

Appendix C. Output Variables
The CPEC200 program stores data in several output tables. Details are given
for each table.
ts_data
The primary output table is ts_data table which gives time-series data. This
table stores each sample of the raw CPEC200 data (ten records per sec). The
CPEC200 program stores this table in multiple files on the memory card, with
a new file started each day at midnight. The size of these daily files depends
on the compile flags. With the default settings, each file is approximately 62
kB and a 2 GB memory card will store data for approximately four weeks
before the CPEC200 program begins to delete old files to make room for new
files. If no valve module is used, the time-series files are slightly smaller,
approximately 55 kB. The largest files will occur when the compile switch is
set to store all diagnostic information, and use the valve module and scrub
modules. These daily files are approximately 120 kB in size. See Section
5.4.2, Compile Switches, for details on setting program constants. If more
storage is required, a 16 GB memory card, the CFMC16G, is available.
The values stored in table ts_data are shown in TABLE C-1. Values that are
stored or not stored depending on compile switch settings have a V, D or S in
the first column of TABLE C-1.
 V means the value is stored only if VALVE_MODULE =
True
 D means the value is stored only if SaveAll_diagnostics =
True
 S means the value is stored only if SCRUB_MODULE =
True
If multiple compile switches are listed for a value, the value is stored in the
table only if all of the compile switches are True. If no compile switches are
listed for a value, the value is always stored in the table.
TABLE C-1. Values stored in table ts_data
Compile
Switch
Variable
Name Units Description
TIMESTAMP TS Date and time the record was measured
RECORD RN Record number
EC_mode Boolean flag: True if the pump is on and no zero/span sequence
is running
diag_cpec CPEC200 diagnostic word
Ux m∙s -1 Wind velocity X component
Uy m∙s -1 Wind velocity Y component
Uz m∙s -1 Wind velocity Z component
Ts ºC Sonic virtual temperature
diag_sonic CSAT3A diagnostic word
CO2 µmol∙mol -1 CO
2
mixing ratio, relative to dry air
H2O mmol∙mol -1 H
2
O vapor mixing ratio, relative to dry air
diag_irga EC155 diagnostic word
cell_tmpr ºC Temperature of the sample cell
C-1