9.2 External Trigger Input
131
3
9
Chapter 9 External 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
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