MR8740T_user_manual_eng_20191016H.pdf - 第107页
102 Conguring the Pre-trigger settings 5.4 Conguring the Pre-trigger settings Pre-trigger Y ou can record not only waveforms that appear after a start trigger has been activated, but also those that appear before the t…
101
Trigger timing
Trigger timing
Recording
[Start]
Starts recording
Starts recording when the instrument is triggered.
Stops the recording
When the mode is
set to [Single]
Stops the recording after the instrument has acquired the recording-length data.
When the mode is
set to [Repeat]
Starts recording, stops the recording after the instrument has acquired the
recording-length data, and then waits for a trigger.
When triggered again, starts recording, stops the recording after the instrument
has acquired the recording-length data, and then waits for a trigger (repeats this
sequence).
Example of trigger timing
When the trigger type is set to the level trigger; level, at 0.000 V; and slope, to positive [
]
Setting of [Timing]
[Start]
0 V
Records recording-length data.
The above processes are repeated when the trigger mode is set to [Repeat].
5
Conguring the Trigger Settings
102
Conguring the Pre-trigger settings
5.4 Conguring the Pre-trigger settings
Pre-trigger You can record not only
waveforms that appear after a
start trigger has been activated,
but also those that appear before
the trigger is activated.
Also records data before the start trigger.
Start
Specied pre-
trigger length
Recording length or
recording time
The pre-trigger is set in percent (%) of the recording length.
Setting all the trigger sources (analog, interval triggers, etc.) to [Off] disables pre-trigger setting.
> [Trigger] > [Common]
1
103
Conguring the Pre-trigger settings
1
Click [Pre-Trigger 0%].
The setting dialog box appears.
2
3
2
Click the [Pre-trigger] box, and then enter a pre-trigger length.
0%
to 100%
Difference between [Waiting for Pre-Trigger] and [Waiting for Trigger]
When starting a measurement, the instrument starts lling the pre-trigger memory. During this
period, the instrument displays the message [Waiting for Pre-Trigger]. After having lled the pre-
trigger memory, the instrument displays the message [Waiting for Trigger] until it is triggered.
While displaying [Waiting for Pre-Trigger], the instrument is not triggered even when a trigger
condition is satised.
Pre-trigger and recording range
• Using the pre-trigger along with the start trigger setting
When the pre-trigger length is set at 95%:
Records the waveforms with the recording
length, 95% of which appear before the start
trigger point.
Start
50% 50%
95%
When the pre-trigger length is set at 50%
Records recording-length waveforms, 50% of
which appear before the start trigger point.
5
Conguring the Trigger Settings