Hioki LR8431, Instruction Manual

Page: 75 / 204

67
3
4
Chapt
er
4 S
p
ecify
ing Crit
eria for Meas
urement
s
(T
riggering, Ala
rm and T
imer)
You can set recording to start and stop under specific criteria (start/stop triggers),
and to output alarm signals. You can also set specific times to start and stop record-
ing, using the Timer function.
Triggering is the process of controlling the start and stop of
recording by specific signals or conditions (criteria). When
recording is started or stopped by a specific signal, we say the
trigger is "applied" or "triggering occurs".

In this manual, indicates a "trigger point", as the time at
which a trigger is applied.
Criteria can be specified for the following event trigger types.
Set trigger criteria for individual channels on the Channel [CH] screen, and set trig-
ger and alarm settings for all channels on the [Trig & Alm] screen (p. 75).
Specifying Criteria for

Measurements (Triggering,
Alarm and Timer)
Chapter 4
Trigger Type Description
Setting
Screen
Ref.
Start Trigger
Recording starts when the specified Start Trigger crite-
ria are satisfied. [CH]/
[Trig & Alm]
(p. 68)
Stop Trigger
Recording stops when the specified Stop Trigger crite-
ria are satisfied. When [Repeat] is enabled (set to
[On]), recording restarts automatically.
[CH]/
[Trig & Alm]
(p. 68)
Pre-trigger
Records data acquired during a specified period prior
to each trigger event.
[Trig & Alm] (p. 72)
Trigger
Source Various trigger criteria can be combined with logical
AND/OR operations for each channel.
[Trig & Alm]
(p. 71)
External

Trigger
Triggering can be applied by an external signal at the
EXT.TRIG input terminal.
[Trig & Alm]
(p. 71)
Alarm
An alarm signal can be output when any specified cri-
teria are met.
[CH]/
[Trig & Alm]
(p. 73)
Timer Records at a specified date and time. [Setting] (p. 76)
Trigger criteria met
T
T
Pre-trigger
Start (Start trigger)
Stop (Stop trigger)
Alarm
Timer
T T