Design Analysis H-350XL, Owner'S Manual, Page: 151 / 272

XL™ Series
Logging Options 15-7
PC Interface View Built In Display Screen
H - Header
Header 1 [MM/DD/YY]->
This option is used to enter a text header for each column of data. For example if the source is set
to “Stage,” the column header could also be set to stage, or it could be set to read “Water Ft” or
“Wtr Lvl,” or anything the user decided. This is especially useful when the source is one of the
SDI-12 channels or a function as they are not intuitive on what the input is.
The header is not only used in the data file but is also used for the status screens and for the side
button displays. On the status screens and side button screens if the header is defined, then it will
be used to identify the data but if the header is left blank (first character is a space) then the
source text will be used to identify the data value.
PC Interface View Built In Display Screen
R - Log Rate: HH:MM:SS
Log Rate [HH:MM:SS]->
This displays the current log rate for the selected column. This option is used to allow the XL™
to log data to the different columns at different rates. The default value is 00:15:00 or 15 minutes
which is equal to the default scan rate. Setting the log rate should be done with the scan rate in
mind. In most cases the log rate and scan rate are the same, but it is possible to scan faster than
the log rate and then log a data value based on several scans such as an average, a max or a min
value. Lets say scanning is set to once a minute and the log rate is set to 15 minutes. In this case
there will be 15 scans for every log value and the average of the 15 values could be logged. Now
if the log rate is faster than the scan rate then it will log based on the scan rate. For example if
the log rate is set to 1 minute and the scan rate is at 15 minutes then data will be scanned and
logged once every 15 minutes regardless of the 1 minute log rate. Setting the log rate to once a
second will cause the logging to follow the scan rate. Try to avoid odd settings like a 3 minute
scan rate and log rate for one column of 5 minutes and another column of 15 minutes. This will
work but may be confusing to other users as the 3 minute scan does not divide easily into the 5
minute log rate.
PC Interface View Built In Display Screen
D - Digits
Digits 1 [2] ->
This sets the number of digits to the right of the decimal that will be logged with the data value.
This allows values like the battery voltage to be displayed without showing too much precision,
and other values like the stage to be logged with the precision needed. This has no affect on the
Date and Time sources. Each column is set for 8 characters so if the digits is set to 2, then that
leaves 1 character for the decimal point and 5 for digits to the left of the decimal point. If the
value is less the 5 digits on the left of the decimal point then the value may be padded with