YOKOGAWA DL850E User Manual page 46

History
When waveforms are being measured, the waveform data stored in the acquisition memory as a
result of a trigger occurrence is displayed as a waveform on the DL850E/DL850EV screen and can
be viewed. When waveform acquisition is being triggered in succession and an abnormal waveform
appears, it is impossible to stop acquisition before a new waveform appears on the screen. Normally,
it would be impossible to view the abnormal waveform. However, with the history feature, you can
view the past waveform data (history waveforms) stored in the acquisition memory when waveform
acquisition is stopped. You can select specific history waveforms and display them.
You can also search through the history waveforms for waveforms that meet specified conditions.
• Zone Search
The DL850E/DL850EV searches for history waveforms that passed (or did not pass) through a
specified search zone.
• Waveform Parameter Search
The DL850E/DL850EV searches for waveforms whose measured waveform parameter values meet
(or do not meet) specified conditions.
Zone Search
History Waveforms
(up to 5000 waveforms)
Waveform parameter search
History Waveforms
(up to 5000 waveforms)
Dual Capturing
You can use dual capturing to simultaneously record a trend at a low sampling speed in roll mode and
at a high sampling rate. This is useful for capturing fast phenomenon while observing a trend over a
long period of time.
Because there is not
enough sampled data, the
shape of the waveform may
not be displayed correctly.
IM DL850E-03EN
Specified zone
Selected Record 0
Selected Record 0
Main waveform (low-speed sampling)
Roll mode display
Sample rate:
100 kS/s or less
Main waveform
Zoomed waveform
(zoomed along the
time axis)
Waveforms that pass through
the specified zone are detected.
Selected Record –25
Waveforms that do not meet the specified
search parameter conditions are detected.
P-P
Selected Record –28
Captured waveforms (high-speed sampling)
Update mode display
Events
The points where triggering
occurred during dual capturing
are displayed as events.
Because the data is sampled at
a high speed, the correct shape
Captured
of the waveform is displayed.
waveform
2.3 Waveform Acquisition
Sample rate:
Faster than that of
the main waveform
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App
Index