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Section 9. Theory of operation
9-25
GPS not available
If the user is unable to view enough satellites to acquire
GPS, then the clock needs to be set manually (Instru-
ment Settings > Set Time > Manual). In this case, the
SYS Date/Time will update based on user settings.
GPS time will not be available and is logged as time =
'0:00:00' and date = '0000-00-00'.
GPS available
When GPS is available, the GPS clock will accurately
reflect Universal Time. The user can use the SYNC func-
tion to update the SYS clock and account for UTC offset
to get the local time (Instrument Settings > Set Time >
GPS Sync).
If SYS time is not synced to GPS time, the time reported
in the SYS group will reflect the last manual update,
and not necessarily match the GPS clock. The real-time
clock counting for the SYS group will drift over time,
typically a few seconds a month, therefore it is good
practice to sync with GPS once lock is achieved before
taking measurements. In a logged data set, the SYS and
GPS clocks can be compared to determine the
UTC offset that is used. UTC offset is maintained
through power cycling of the instrument.
References
Buck, A.L. (1981). New equations for computing vapor pres-
sure and enhancement factor. J. Appl. Meteor. 20:1527-1532.
Escribano-Rocafort, A.G., Ventre-Lespiaucq, A.B., Granado-
Yela, C., L pez-Pintor, A., Delgado, J.A., Mu oz, V., Dorado,
G.A. and Balaguer, L. (2014), Simplifying data acquisition in
plant canopies- Measurements of leaf angles with a cell
Summary of Contents for LI-600
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