16-6
IM DL850E-01EN
16 Displaying and Searching History Waveforms
• An averaged waveform cannot be displayed for the following waveforms.
Waveforms with record lengths of 250 kpoint or greater on the standard model, 1 Mpoint or greater on models
with the /M1 option, or 2.5 Mpoint or greater on models with the /M2 option.
• 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 A
verage 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.
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