MR8740、MR8741_user_manual_eng_20191016H.pdf - 第218页
8.9 Pre-Trigger Settings 206 This applies to the Memory function only. You can set whether a trigger is recognized (accepted) if trigger criteria are met during th is period. • When pre-triggering is ena bled, trigger ev…
8.9 Pre-Trigger Settings
205
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Chapter 8 Trigger Settings
8
Description About pre-triggering and the recording period (recording length)
Difference between [Pre-Trigger wait] and [Trigger wait]
When measurement is started, the specified pre-trigger length is recorded. This
period is indicated as the [Pre-Trigger wait].
After the specified pre-trigger length has been recorded, the period indicated as
[Trigger wait] continues until a trigger occurs.
See: "Measurement and Internal Operations" (p.82)
Trigger Point
95% 95% of the recording length is
recorded before the trigger
point
50% 50% of the recording length is
recorded before and 50% after
the trigger point
-95% 95% of the recording length is
recorded after the trigger point
T
Pre-Trigger setting examples
• Trigger events during the specified pre-trigger recording period are ignored. To
enable recognition of such triggers, set Trigger Priority to [On].
See: "8.9.2 Setting Trigger Acceptance (Trigger Priority)" ( p.206)
8.9 Pre-Trigger Settings
206
This applies to the Memory function only.
You can set whether a trigger is recognized (accepted) if trigger criteria are met during this period.
• When pre-triggering is enabled, trigger events are normally ignored for a cer-
tain period after measurement starts (while recording the specified pre-trigger
period).
• This period is indicated on the Status bar as [Pre-Trigger wait].
Description When trigger criteria are met during [Pre-Trigger wait]
Example: When the pre-trigger period is set to 50%
8.9.2 Setting Trigger Acceptance
(Trigger Priority)
Procedure
To open the screen: Right-click and select [DISP] Waveform screen Right-click and select [TRIG.SET] Trig-
ger settings window
Move the flashing cursor to the [Trig Prio] item.
Select
Off Trigger events are ignored during [Pre-Trigger wait]
(default setting)
On
Trigger events are recognized (accepted) during [Pre-
Trigger wait].
50% of Recording Length
before trigger
Trigger Priority: [Off]
T
(After 50% of the Recording Length is recorded internally, the [Trigger
wait] state begins)
[Trigger wait][Pre-Trigger wait]
50% of Recording Length
after trigger
T
Trigger ignored
[Now Storing]
Start
Measurement
Recording Length before trigger
Trigger Priority: [On]
[Pre-Trigger wait]
50% of Recording Length after trigger
T
Trigger accepted
[Now Storing]
(A trigger event occurs while 50% of the Recording Length is being
recorded internally)
When a trigger event occurs during pre-trigger recording, the data actually recorded
may be shorter than the specified recording length. (In this case, the pre-trigger re-
cording length is shortened. The recording length after the trigger event is the speci-
fied recording length minus the specified pre-trigger period.)
Start
Measurement
8.10 Setting Trigger Timing
207
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Chapter 8 Trigger Settings
8
This applies to the Memory function only.
Set waveform recording operation when a trigger event occurs.
Description About trigger timing
The selected trigger mode determines how recording stops.
Example: When the trigger type is Level Trigger, Level = 0.000 V, and Slope = (rising)
8.10 Setting Trigger Timing
Procedure
To open the screen: Press the DISP key Waveform screen Press the TRIG.SET key Trigger settings window
Move the flashing cursor to the [Timing] item.
Select
Start
Start recording when a trigger event occurs, and stop after
the specified recording length.(default setting)
Stop
Start recording when the START key is pressed, and stop
when a trigger event occurs.
Start & Stop
Record the interval from one trigger event until the next
trigger event.
[Start] [Stop] [Start & Stop]
T
RecordingSTART key
T
Recording
T T
Recording
Recording
Starts
Recording starts when a trigger
event occurs
Recording starts when you press
the START key
Recording starts when a Start trig-
ger event occurs
Recording
Stops
With [Single]
trigger mode
Recording stops after data has
been acquired for the specified
recording length
Recording stops when a trigger
event occurs
Recording stops when a Stop trig-
ger event occurs
If no trigger event occurs before the specified recording length elapses:
[Stop] or [Start & Stop]: Recording stops after data has been acquired for the specified recording length
With [Repeat]
trigger mode
The Trigger Wait state begins af-
ter data has been acquired for the
specified recording length
When another trigger event oc-
curs, data is again acquired for the
specified recording length, then
Trigger Wait resumes (repeats)
When a trigger event occurs, re-
cording stops and then starts
again (repeats)
When a trigger event occurs, re-
cording stops and the Trigger Wait
state resumes. When another trig-
ger event occurs, recording con-
tinues until the next trigger occurs
(repeats)
If no trigger event occurs before the specified recording length elapses:
[Stop] : After data is acquired for the specified recording length, recording restarts. This repeats until
a trigger event occurs.
[Start & Stop]: The Trigger Wait state begins after data has been acquired for the specified recording length
(Start Trigger)
[Start]
[Stop] [Start & Stop]
Records for specified record-
ing length
Press START key to record
Records until a trigger occurs
TT
START key
Recording starts when a Start
trigger event occurs Records
until a Stop trigger occurs
TT
The above sequences repeat when the trigger mode is [Repeat].
0 V0 V0 V
Setting of [Timing]