Hioki LR8431, Instruction Manual

Page: 79 / 204

4.1 Setting Criteria to Start and Stop Recording
71
3
4
Chapt
er
4 S
p
ecify
ing Crit
eria for Meas
urement
s
(T
riggering, Ala
rm and T
imer)
Enable the trigger function (set to On), select recording start/stop timing, and
set trigger criteria. Triggering is affected only by those channels for which trig-
ger criteria have been set.
Make these settings on the [Trig & Alm] screen.
If trigger settings have been made on the [CH] screen, skip steps 1 and 2.
The settings in steps 1 and 2 are interlinked with those on the [CH] screen.
Selecting Trigger Sources and Combinations
1
Set the [Trigger] to [On] .
2
Select the [Timming] setting option to deter-
mine how triggering will affect recording.
Setting options: (

default setting)
(Start and stop triggers can be set for each channel in-
dependently.)
3
Select how trigger sources are logically com-
bined using the
[Trig Source]
-
[Start]
and
[Stop]
setting options.
Setting options:(

default setting)
4
(When an external trigger is applied)
Set the
[Ext trig]
-
[Start]
or
[Stop]
setting to
Start* Start recording according to Start Trigger
criteria.
Stop Stop recording according to Stop Trigger
criteria.
Start&Stop Start and stop recording according to the
Start and Stop Trigger criteria, respec-
tively.
OR* Triggering occurs when any one of the spec-
ified trigger source criteria is met. (includes
external trigger signal)
AND Triggering occurs only when all of the speci-
fied trigger source criteria are met. (includes
external trigger signal)
1
2
3
4
[AND]
One waveform has crossed
above 0V as the other
crosses on the upslope
[OR]
Either waveform crosses
0V on the upslope
Start

Measurement
Trigger....... Level
Level............. 0 V
Slope

To apply a trigger when the upslope (

) of the waveform crosses zero volts:
Start

Measurement
T T T T
When the trigger combining logic is set
to [AND]
If trigger criteria are already met when
you press the
START/STOP
key, no trig-
gering occurs. Triggering occurs only
after all trigger sources have ceased to
meet the criteria at once, and are sub-
sequently met again.