Hioki LR8431, Instruction Manual

Page: 139 / 204

9.2 External Trigger Input
131
3
9
Chapt
er
9 Externa
l Control
Triggering can be controlled by applying a signal from an external trigger source.

This allows synchronous operation of multiple Memory HiLoggers by parallel trigger-
ing (p. 135).
9.2 External Trigger Input
External signal input
(EXT.TRIG)
Trigger event occurs.
Trigger Input Signals
Voltage range HIGH level: 3.0 to 5.0 V, LOW level: 0 to 0.8 V
Pulse width HIGH level: 1 ms or greater, LOW level: 2

s or greater
Maximum input voltage 0 to 7 V DC
HIGH
3.0 to 5.0 V
LOW
0 to 0.8 V
2

s or
greater
1 ms or greater
GND
2200 pF
470

10 k

5 V
EXT.TRIG
[

] [

]
5 V
Signal Input Procedure
1
Connect the external trigger signal source and
signal ground to external control terminals 3
(EXT.TRIG) and 1 (GND), respectively.
2
Press the SET key to open the
[System]
screen.
3
Set the
[External Trig In]
setting to
[Trigger]
(default setting).
4
Open the [Trig & Alm] screen, and set the
[Trig
Func]
to
[On]
.
5
Specify trigger start and stop times by the [Tim-
ing]
settings, as needed.
6
Set the
[Ext Trig] - [Start]
and
[Stop]
settings to
[On] .
7
Either short the EXT.TRIG terminal to ground,
or apply a pulse train (rectangular wave) to the
EXT.TRIG terminal, with 3.0 to 5.0 V High and
0 to 0.8 V Low levels.

Triggering occurs on the falling edge of the in-
put waveform.
For the connection
method (p. 130)
3
4
5
6