Campbell Scientific AP200 CO2/H2O Atmospheric Profile System User Manual

Page 90

Appendix D. Output Tables

AUTO_ZEROSPAN, CAL_INTERVAL, and CAL_TIMEOFFSET. The

next value,

sync_interval, is calculated by the program. It is the duration of

the valve sequence in seconds. This value is used by the program to

synchronize the valve sequence to the real-time clock. For example, if

sync_interval is 90 s, the sequence will start at the top of the hour, or 1:30

later, or 3:00 later, etc.

The rest of the

TimeInfo contains the arrays of timing parameters. Each array

holds eight values, where the index corresponds to the index in the sequence. If

LEVELS_USED is less than 8, zero is stored for the parameters that are not

used.

ProfileSequence: the valve number for this step in the profile sequence. This

will simply increment from 1 to

LEVELS_USED.

ProfileOnCounts: the time (number of scans) to spend at this step, typically

30 counts (15 s).

ProfileOmitCounts: the time (number of scans) to wait after a valve switch

before including data in the averages, typically 20 scans (10 s).

The next arrays contain the corresponding values for the calibration (zero/span)

sequence.

TABLE D-5. Variables of the

TimeInfo Table

Name

Units

TIMESTAMP

RECORD

LEVELS_USED

MEASURE_TANKS

AUTO_ZEROSPAN

CAL_INTERVAL

min

CAL_TIMEOFFSET

min

sync_interval

ProfileSequence(1)

ProfileSequence(2)

ProfileSequence(3)

ProfileSequence(4)

ProfileSequence(5)

ProfileSequence(6)

ProfileSequence(7)

ProfileSequence(8)

ProfileOnCounts(1)

D-10