5-7
IM DL850E-01EN
Dual Capture (DUAL CAPTURE)
You can use dual capturing to simultaneously acquire waveform data (main waveform) in low-speed roll mode
and at a high sample rate (captured waveform). Dual capturing is useful during low-speed sampling when you
are observing waveforms over a long period of time and want to capture fast phenomena at a high sample rate.
• When the waveform data is saved, captured waveforms are saved along with the main waveforms. When you
load the main waveforms, the captured waveforms are also loaded.
• When the window for displaying captured waveforms (the dual capture window) is displayed, cursor
measurement, automated measurement of waveform parameters, and statistical processing can be performed
on the captured waveforms. Measured captured-waveform values are displayed in italics. When captured
waveforms are not displayed, the measurement and processing are performed on the main waveforms. When
the waveforms that are measured and processed change, the measured values are reset.
Captured waveforms
(high-speed sampling)
Update mode display
Main waveforms
(low-speed sampling)
Roll mode display (up to 1 Gpoint)
Captured
waveforms
Zoomed waveform
(along the time axis)
Main waveform
Sample rate:
100 kS/s or less
Sample rate:
Faster than that of the main waveform
Because there is not
enough sampled data,
the shape of the
waveform may not be
displayed correctly.
Because the data is
sampled at a high speed,
the correct shape of the
waveform is displayed.
Events
The points where triggering
occurred during dual capturing
are displayed as events.
Channels That Dual Capturing Is Performed On
Normally, dual capturing is performed on all the channels detected by the DL850E/DL850EV. However, under
the following conditions, dual capturing is performed only on channels whose displays are turned on.
• When hard disk recording is enabled
• When an increase in the record length of the main waveforms places a limitation on the number of channels
that can be used
In both cases, dual capturing is not performed on 16-CH voltage input module and 16-CH temperature/voltage
input module sub channels whose input coupling is set to OFF.
Turning Dual Capturing On and Off (Mode)
Set whether to enable or disable dual capturing.
• ON: Dual capturing is enabled.
• OFF: Dual capturing is disabled.
5 Waveform Acquisition