Chapter 3. Logging data
3.1 Introduction
This chapter explains how to use the model GF868’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 GF868 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 can not 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 17 in Appendix A, menu maps, 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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