18-1
IM DLM3054-01EN
18 Displaying and Searching History Waveforms
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 display or search past waveforms (history waveforms).
You can perform the following operations on history waveforms:
• Display
You can display any single waveform or display all waveforms without gradation (and highlight only the
specified waveform). You can also assign colors or intensities based on the frequency of occurrence of
waveforms. You can list the timestamps (the trigger times) of all history waveforms.
Waveform Data for the Last N Triggers Is Stored
Select No. 0
Select No.
−
25
Current displayed waveform
(Select No. = 0)
Displays past waveforms
(Set Select No. in the range of 0 to − (N − 1)
• Search
You can search for waveforms that meet the specified conditions, display the detected history waveforms, and
list the timestamps of the waveforms.
Waveforms stored in the acquisition memory
Searches for waveforms that
pass through the specified area
and displays detected waveforms
Select No. 0
Select No.
−
25
Specified area
• Average
You can linearly average history waveforms in a specified range and display the averaged waveform.
• 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 Select No. 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 Select No. If
the display mode is set to All, XY waveforms of all history waveforms are displayed.
• If you restart waveform acquisition by using the RUN/STOP key, all history waveforms that had been stored
up to that point are cleared. However, if the trigger mode is set to Single (using the SINGLE key), the
waveform that had been stored using the SINGLE key remains as a history waveform unless you change
the waveform acquisition conditions.
• If you change the waveform acquisition conditions, all history waveforms that had been stored in the
memory are cleared.
• If you change user-defined computation settings while using the history feature, recomputation is not
performed on the history waveforms. To recompute, execute Math on History.