Hioki LR8400-20, Instruction Manual

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9.4 Synchronous Measurements with Multiple HiLoggers
166
Multiple HiLoggers can be synchronized using the external control terminals.
Two synchronization methods are available, as follows.
9.4 Synchronous Measurements with Multiple
HiLoggers
Although this function synchronizes the measurement start time of multiple
HiLoggers to the external trigger signal, it does not synchronize actual
sampling times.
Over long-term measurements, data acquisition times will differ because
of sampling block scattering on each HiLogger.
GND
EXT.TRIG
TRIG OUT
GND
Set all HiLogger to master.
Setting Procedure
On all HiLoggers, set the
[External Trig In] to
[Trigger] (p. 108).
Triggering any HiLogger triggers all con-
nected HiLoggers. As the number of con-
nected HiLoggers is increased, the trigger
time difference between them becomes
larger.
Daisy chain (serial) synchronization
Connection example
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
GND
EXT.TRIG
TRIG OUT
GND
Set one HiLogger to master, and set the oth-
ers to slave.
Setting Procedure
On the slave HiLoggers, set the
[External
Trig In] to [Trigger] (p. 108)
One HiLogger serves as the master (for trig-
ger control), so that when it is triggered, all
other HiLoggers start measuring at the same
time.
Use this method to minimize the trigger time
difference between HiLoggers.
Parallel synchronization
Connection example
EXT.TRIG
TRIG OUT
GND
EXT.TRIG
TRIG OUT
GND
Master
Slave
Slave