Vemco HR2, User Manual

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CLOCK_REF
CLOCK_REF records contain clock reference information. Clock reference information is date and
time information from an external source, such as your computer, that is added to the receiver log file
to help with correction for receiver clock drift. CLOCK_REF records are used in conjunction with
CLOCK_SET records to calculate drift-corrected times (“Time” field) for the data in all record
types.
Field Description
Device Time (UTC) UTC date and time of the data according to the receiver’s clock (the
uncorrected time).
Time Date and time of the data following correction for receiver clock drift
(the corrected time). The time offset of this time from UTC is indicated
in the “Time Offset (h)” column.
Time Offset (h) Offset from UTC time, in hours, of the value in the “Time” column.
The time offset is as selected when the receiver log was exported to
Fathom CSV format using the Fathom software.
Time Correction (s) The difference between uncorrected (“Device Time (UTC)”) and cor-
rected (“Time”) times.
Model Receiver model that generated the data in this record.
Serial Number Serial number of the receiver that generated the data in this record.
External Time (UTC) UTC date and time of the external (reference) device (ex: UTC time
calculated from your computer’s time and time zone settings)
External Difference
(s)
Difference between the external (reference) date and time (“External
Time (UTC)”) and the date and time according to the receiver’s clock
Source Source of the external date and time information
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6.2 Exporting Data