20-1
IM DL350-01EN
20 History Waveform Display (Scope mode only)
Acquisition memory stores waveforms that are displayed on the screen and waveform data that have been
acquired in the past. The history feature allows you to any single waveform or display all waveforms (and
highlight only the specified waveform). You can also list the timestamps (the times at the time references) of all
history waveforms.
Waveform Data for the Last N Triggers Is Stored
Selected Record 0
Selected Record
−
25
Current displayed waveform
(Selected Record = 0)
Past waveform
Set Selected Record to a value
in the range of 0 to – (N – 1).
Calculation, Cursor Measurement, Automated Measurement, Statistical Processing,
and FFT
You can perform calculations, cursor measurement, automated measurement of waveform parameters, or FFT
analysis on the history waveform that you specified with Selected Record. You can also calculate statistics of
automatically measured values on all history waveforms.
Displaying and Analyzing XY Waveforms
You can display XY waveforms and perform analysis on the history waveform you specified with Selected
Record. If the display mode is set to All, XY waveforms of all history waveforms are displayed.
Display Mode (Display Mode)
Selects how history waveforms are displayed.
• One waveform (1 Record): Only the waveform that corresponds to the selected record number is displayed.
• All waveforms (All Record): All history waveforms from the specified start (Start Record) to stop (End Record)
number are overlaid. All waveforms other than the highlighted one are displayed in an intermediate color.
• Averaged waveform (Average Record): Linear averaging is performed on all history waveforms from the
specified start (Start Record) to stop (End Record) number, and the results are displayed as a single
waveform.
An averaged waveform cannot be displayed for the following history waveforms.
Waveforms with record lengths of 250 kpoint or greater
Highlighting (Selected Record)
The latest history waveform is assigned the record number zero, and older waveforms are assigned numbers in
descending order (−1, −2, −3, and so on).
The waveform and timestamp that correspond to the record number you specify here are highlighted.
Selectable range: 0 to −(the number of waveform acquisitions − 1)