Logging Data 3-1
March 2008
Introduction This chapter explains how to use the Model DF868’s data logging
capability. The
LOG menu, which is accessed by pressing the [LOG]
key on the keypad, is divided into four submenus:
• STD - used to log up to three of the available measurement data
parameters
• MEM - used to check the data logger memory to determine if the
specified log will exceed the available memory
• STOP - used to terminate current data logging activity
• ERROR - used to log any generated error messages.
Up to twenty standard or error log files may be created and stored in
battery-backed memory. Each log file contains up to three
measurement parameters, the log start time and date, the log end time
and date, the time interval between updates, and any error messages.
Error logs record data only when an error message is generated.
The Model DF868 allocates up to 120 pages of memory, each of
which can contain up to 120 records, for data logging. Each page is
assigned a header, to distinguish one page from another. The header
contains the log title, start date and time, end date and time, and the
time increment. Each record contains the date and time of the
measurement and the values for the three logged parameters.
Note: Each log file uses at least one page of memory, and the same
page cannot be shared by two different logs.
Since a fixed amount of memory is allocated for data logging, the
number of active logs, the log time increments, and the length of the
log runs will all affect how much memory is available for additional
logging. For example, a log that updates every 5 seconds will use
more memory than a log that updates every 6 minutes, assuming that
they both run for the same length of time.
After a log file has been created, it may be displayed, printed, cleared
or uploaded to a personal computer. Refer to the appropriate chapters
of this manual for specific instructions.
Refer to Figure A-8 on page A-8, and proceed to the appropriate
section for the desired
LOG submenu. Each submenu may be followed
in the sequence shown or the [↑] and [↓] keys may be used to scroll
through the prompts.
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