Simultaneously Starting Measurement Using External Triggers - Hioki MEMORY HiLOGGER LR8450 Instruction Manual

Configuring External Input/Output (I/O) Terminals

Simultaneously starting measurement using external triggers

This section describes how to synchronize the measurement start time for multiple instruments
using trigger input and trigger output.
Since each instrument generates its own sampling clock, data acquisition times will diverge if
measurement is continued for an extended period of time.
There are two methods for synchronizing measurement start times: daisy chain operation and
parallel synchronized operation.
Daisy chain operation
When a trigger activates for any instrument, triggers will also activate for other instruments.
When a large number of instruments are connected, divergence among individual devices' trigger
times will increase.
Connection method
Connect one instrument's trigger output (I/O 4) to the next
instrument's trigger input (I/O 3).
Repeat this connection until all the instruments have been
connected.
Configuration method
• Set [Trigger]
• Set [External trigger]
• Set [External input 3]
for all the instruments. (p. 2 29)
• Set [External output]
instruments. (p. 2 30)
Parallel synchronized operation
Use one instrument as the master (trigger monitoring) and the rest as subordinates.
When a trigger activates for the master instrument, triggers will also activate for the subordinate
instruments.
Divergence in trigger times can be minimized using this method, even when the number of
connected instruments increases.
Connection method
Connect the master instrument's trigger output (I/O 4) to all
subordinate instruments' trigger input (I/O 3).
Configuration method
• Set [Trigger]
[External trigger]
• Set
instruments. (p. 1 29)
• Set [External input 3]
for all the subordinate instruments. (p. 2 29)
• Set [External output]
instrument. (p. 2 30)
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to [ON] for all the instruments. (p. 1 16)
to [ON] for all the instruments. (p. 1 29)
to [Trigger input]
to [Trigger output]
to [ON] for all the instruments. (p. 1 16)
[ON]
to for all the subordinate
to [Trigger input]
to [Trigger output]
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Example connections
and the edge to [↓]
for all the
Example connections
and the edge to [↓]
for the master
.com
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
GND
Master
EXT.TRIG
TRIG OUT
GND
Subordinate
EXT.TRIG
TRIG OUT
GND
Subordinate
EXT.TRIG
TRIG OUT
GND
GND
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