Newport LDC-3706 Series, User Manual

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December 2019 30 LDC-3706 Series Laser Controller
Using the LDC-3706 Controller’s Trigger Output Function
For applications where initiating synchronous measurements is required for a remote instrument with
the LDC-3706, the controller offers a TTL level trigger output signal. The trigger pulse is initiated with
any change in setpoint of the laser current source and after the analog output has settled. A typical
application for utilization of this feature is laser characterization tasks where an L-I-V curve is
generated. For programmed steps in laser current, a light measurement can be triggered for each
step in laser current. The trigger output is always enabled.
NOTE: The minimum time required for setpoint to be reached varies based on the type of setpoint change. Care
should be exercised with respect to the timing of any setpoint commands in relation to the actual hardware function.
The trigger signal may be missed if the program step time is too fast.
A one shot trigger pulse will occur on power up of the instrument due to the states of the processor
I/O connections.
A grounded female BNC connector on the rear panel of the LDC-3706 Laser Controller is available
for connecting any standard BNC terminated cable and connecting to equipment that can accept the
levels produced by the LDC-3706 instrument trigger out signal.