Section 8. Working with Data Files on the PC
data file (day, hrmn, sec.) are different each time the data are collected, but by
telling Split where to Start reading relative to the PC clock, the Start
Conditions do not need to be changed. To accommodate variations in the data
collection and reduction frequencies, an interval in minutes or seconds may be
specified as shown in the examples below.
2[–0]:3[–60,5] tells Split to start at a timestamp in the data that is between 55
and 65 minutes prior to the current PC time (the closest 5 minute interval of the
current day that is less than the PC time minus 60 minutes). If you are
processing data stored at the top of the hour and the PC time is 1404, Split
calculates 1304 and looks for hour 1300 to start reading.
2[–3]:3[–120,60] tells Split to find the closest 60 minute interval that is less
than the PC time minus 3 days and 2 hours. If the PC time is the day of year
159, hour 0017, Split will start reading on data output at 2200 hours on day
155.
2[–3]:3[–120]:4[20,5] tells Split to find the closest 5 second interval that is less
than the PC time minus 3 days, 2 hours and 20 seconds. If the PC time is 27
seconds after noon on day 30, Split will begin reading on data output at 1000
hours and 05 seconds on day 27.
Split can also begin processing a file on a particular month and day. Use the
syntax :E[Month%Day]::, where E is the element that contains the Julian Day,
and Month and Day are either constants or a value related to PC time. For
example:
:2[–1%1]:: tells Split to begin processing on the first day of the previous
month.
:2[–0%15]:: tells Split to begin processing on the fifteenth day of the
current month.
:2[5%1]:: tells Split to begin processing on May 1.
This function can be used in both the Start and Stop conditions. It provides a
simple way to create a monthly report. For additional information, refer also to
Section 8.2.3.1.15.2, Using Time Synchronization While Starting Relative to
PC Time.
Split will not start reading if the exact specified starting time
cannot be found, unless you enable the “Start-Stop
On/After Time” feature. The interval (5 minutes, 60
minutes, and 5 seconds in the examples above) must be
evenly divisible into 60 minutes.
CAUTION
• If the start time is a certain number of days prior to the PC
time, the file will be processed beginning at midnight of the
day specified.
NOTE
• To specify a start time in minutes from the current PC time,
you must also specify a day parameter of [–0]. Otherwise,
processing will begin at the first instance in the data file that
the minutes parameter equals the current minutes.
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