Instructions

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File Utilities: displays a list of logging files currently within the instrument. Operates similarly to
other file utilities screens – see section 5.5.
7.11.2 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.
7.11.2.1 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.
7.11.3 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.
To achieve the fastest possible logging use Continuous trigger - see section 7.11.6.
7.11.4 Logging from External Trigger
The logging function can be set via the Log Trigger key to save entries on either a positive or
negative going edge applied to the Trigger socket - see section 7.8.1.
The data that is logged will relate to the sweep that was in progress when the trigger signal
occurred.
7.11.5 Logging from Amplitude Limits
The logging function can be set via the Log Trigger key to save entries when a trigger is
generated by the Amplitude Limits Comparator. The data that is logged will relate to the sweep
that was in progress when the limit condition occurred.
The Limits function must be set to have a potentially valid condition as set by Limit Condition,
however the logging trigger is independent of the Limit Action which can be set to any value
including none. See section 7.10 for an explanation of the Limits function.
7.11.6 Logging Every Sweep (Continuous)
The logging function can be set via the Log Trigger key to save entries continuously, i.e. after
every sweep. The actual speed will depend upon the sweep rate and the type of data being
logged. The fastest possible logging rate is about two per second.
7.11.7 File Sizes and Maximum Logging Times
Logging files can vary in size from a few kB to more than 100MB depending upon the number
of entries and the type of data being logged.