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7-13
IM 701210-05E
Acquisition and Display
7
Explanation
This function enables waveform acquisition in low-speed roll mode (main waveform)
along with high-speed waveforms (sub waveform) at a different sampling interval. It is
useful when capturing at high speeds abnormal phenomenon that occurs suddenly
during long-term observation (low-speed sampling). The sub waveform is saved
simultaneously when the main waveform is saved. Likewise, when the main waveform is
loaded, the sub waveform is also loaded. This function is valid when the acquisition
mode is set to normal, envelope, or box average.
Cannot tell how many burst waveforms occurred
When displayed using the zoom function
When displayed using the dual
capture function
Main waveform
Able to observe the occurrence of
five burst waveforms
Observe this phenomenon using the
zoom function (horizontal zoom) and
the dual capture function
(T/div: 100
µ
s/div for both)
Sub waveform window
Event waveforms
Displays the time when the sub waveform was
acquired as an event waveform
Sub waveform acquired here
The dual capture function has the following two trigger modes.
• Auto Mode
For the main waveform, measurement is performed from the time sampling is started
until there is a request to end the sampling. The number of sub waveforms that can
be saved varies between the standard model and memory expansion models (/M1, /
M2, and /M3).
Standard model:
Up to 100
/M1 model:
Up to 250
/M2 and /M3 models:
Up to 500
If the maximum number of sub waveforms is exceeded, the oldest sub waveform is
deleted, and the newest waveforms are saved.
• Log Mode
For the main waveform, the waveform is acquired from the time sampling is started up
to the specified record length. For the sub waveform, up to 100 sets can be stored.
When this number is reached, the acquisition of sub waveforms stops.
Waveform Acquisition Condition of the Dual Capture Function
Waveforms can be acquired when all of the following conditions are met.
• When the T/div setting of the main waveform is from 100 ms/div to 3 days/div
• When the sample rate of the main waveform is less than or equal to 100 kS/s
• When the sample rate of the main waveform is less than the sample rate of the sub
waveform
Applicable Channels
The applicable channels are all channels that are identified for both main waveform and
sub waveform (However, when the record length is greater than or equal to 2.5 MW on
the standard model, 10 MW on the M1 option model, 25 MW on the M2 option model,
and 50 MW on the M3 option model, the applicable channels are those that are turned
ON). DSP channels are also applicable.
7.6 Using the Dual Capture Function