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20-3
IM DL350-01EN
Notes on Using the History Feature
• You can start waveform acquisition when the History menu is displayed. However, you cannot change the
history feature settings while waveform acquisition is in progress.
• When the acquisition mode is set to Average, you cannot use the history feature.
• You cannot use the history feature when SD recording is being executed.
• If you stop waveform acquisition, even if one complete screen’s worth of waveform data has not been
acquired, the waveform at which the trigger occurred is displayed as a single history waveform.
• If you stop waveform acquisition and then start it again without changing the waveform acquisition conditions,
the waveform data continues to be stored in the acquisition memory.
• If you change the waveform acquisition conditions and start waveform acquisition, the past data stored in the
acquisition memory is cleared.
• An averaged waveform cannot be displayed for the following waveforms.
Waveforms with record lengths of 250 kpoint or greater
• The settings are restricted so that the following relationship is retained: Last record (End Record) ≤ Selected
Record ≤ first record (Start Record).
• When you load waveform data from the specified storage medium, history waveforms up to that point are
cleared. The loaded waveform data is placed in record number zero. If you load a file containing multiple
history waveforms, the latest waveform is placed in zero, and earlier waveforms are placed in order to record
numbers 1, 2, and so on.
• Computation and automated measurement of waveform parameters are performed on the waveform of the
record number specified by Selected Record. You can analyze old data as long as you do not overwrite the
acquisition memory contents by restarting waveform acquisition. If Display Mode is set to Average Record,
analysis is performed on the averaged waveform.
• The times that are listed are the times at the time references. When the waveform display is in update mode,
the time references are the trigger times. Furthermore, these times vary as indicated below depending on the
trigger mode.
Trigger Mode
Condition
Time Displayed in the List
Auto/Auto Level
Roll mode
Stop time
Single
Roll mode, no trigger
Stop time
On Start
−
Start time
• When all the waveforms are displayed, if a large number of records are selected, it may take time for them
to be displayed completely. When the display is not complete, appears in the center of the screen. If you
want to stop the operation, set Display Mode to 1 Record.
• History waveforms are cleared when you turn the power off.
20 History Waveform Display (Scope mode only)