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Once logging has commenced it is not possible to make any changes to the instrument’s set-up
without closing the logging file. It is also not possible to turn the instrument power to Off without
closing the file first.
Change Name: the name of the logging file that will be created is displayed at the top of the
menu area. The file name is an auto-incrementing numeric of the default file name (shown in
green). Pressing Change Name opens an alpha-numeric keypad from which a user-chosen
name of up to 8 characters can be entered.
Change Default: enables the default file name that will be automatically allocated to the next
logging file to be changed. Standard default file name rules apply - see section 5.1.1.1
Enable Logging: commences the opening of a logging file under the currently displayed name.
An information message is displayed and logging is actually enabled after confirming with the
Status hard key.
Pause/Enable: causes new entries into the current logging file to be suspended and re-started.
However it is not possible to exit from the logging control menu without closing the current file.
Close File: closes and saves the current logging file. Once closed the file cannot be re-opened
(although it can be renamed or deleted). The Log File name changes to the next default name
ready for the next logging file to be enabled.
Cancel/Exit: exits the logging control menu provided that a logging file is not currently enabled
or paused, in which case a warning message is displayed telling the user that exiting will
disable logging and close and save the current file.
File Utilities: displays a list of logging files currently within the instrument. Operates similarly to
other file utilities screens
– see section 5.5.
7.7.2 Manual Logging
The logging function can be set via the Log Trigger key to save entries in response to a manual
key press. Both the Run/Stop hard key and the sweep control touch-screen key act as the
manual trigger.
The data that is logged will relate to the sweep that was in progress when the key was pressed.
7.7.2.1 The Run/Stop key and Sweep Control key
When logging, the Run/Stop hard key and sweep control touch-screen key have no function
unless the Log Trigger has been set to Manual, in which case both act as a manual trigger key.
In all other trigger modes (timer, external, limits or continuous) the keys are inactive. However,
the touch-screen key does provide visual feedback of the stages of the logging process. When
no trigger event has yet occurred the key is green and marked Awaiting Trigger. When a
trigger has occurred but the sweep has yet to complete it becomes yellow and is marked
Triggered. When the sweep is completed and the log file entry is being made it becomes red
and is marked Writing File.
7.7.3 Logging from the Timer
The logging function can be set via the Log Trigger key to save entries triggered at a fixed time
interval.
The Timer Setup key enables a time between trigger events to be set between 5 seconds and
100 minutes. However, if the timer interval is set to a short period, the actual time between
logging entries may be considerably longer than the trigger interval. This is because, for each
entry, a sweep must be completed and the data must be saved. If the sweep is set to a wide
span and/or narrow RBW, the sweep time could be several tens of seconds.
The timer is asynchronous with respect to the sweep. Consequently the time between logging
entries will be longer than the timer interval by a variable amount which is a function of the
sweep time. The log entry time stamp represents the time at the end of the logged sweep.