Hioki MEMORY HiLOGGER LR8450 User Manual

232
Conguring 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.
Conguration method
• Set [Trigger] to [ON] for all the instruments. (p. 116)
• Set [External trigger] to [ON] for all the instruments. (p. 129)
• Set [External input 3] to [Trigger input] and the edge to [↓]
for all the instruments. (p. 229)
• Set [External output] to [Trigger output] for all the
instruments. (p. 230)
Example connections
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
GND
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).
Conguration method
• Set [Trigger] to [ON] for all the instruments. (p. 116)
• Set [External trigger] to [ON] for all the subordinate
instruments. (p. 129)
• Set [External input 3] to [Trigger input] and the edge to [↓]
for all the subordinate instruments. (p. 229)
• Set [External output] to [Trigger output] for the master
instrument. (p. 230)
Example connections
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
GND
Master
Subordinate
Subordinate
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Hioki MEMORY HiLOGGER LR8450 Specifications

General

Brand	Hioki
Model	MEMORY HiLOGGER LR8450
Category	Data Loggers
Language	English