DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
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Chapter 3. Logging Data
Chapter 3. Logging Data
3.1
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 17 on page 104, 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.