MNL-1029 Rev A
13
Timing Signals
Single Strobe Output
Synchronization of external devices to the spectrometer's integration period can be accomplished with the Single Strobe Output. The
Single Strobe Output is an active-high programmable pulse that occurs at a user-defined time during each acquisition cycle. This
pulse has a user-defined delay (t
SSDLY
) and a user-defined width (t
SSH
). Both values are programmable in 1 µs increments for the range
of 0 to 65,535 µs.
The timing of the Single Strobe signal output is referenced from a Trigger Event. The Single Strobe Delay defines the time from the
Trigger Event until the rising edge of the Single Strobe output. Note that a programmed Acquisition Delay can cause the Single Strobe
to pulse before the start of integration. After the Single Strobe Delay has elapsed and the Single Strobe Output has gone high, it will
remain active for a duration equal to the Single Strobe Width. The Single Strobe Output will return to a low or inactive state at the end
of the Single Strobe Width.
If the Single Strobe Output is programmed for a longer period than the integration time, it will reset to its inactive state at the end of
the integration period.
See timing diagrams later in this section for more information of the Single Strobe Timing.
Synchronous Continuous Strobe
The Continuous Strobe output signal is a programmable TTL pulse that occurs at a user-defined time during each acquisition cycle.
The Continuous Strobe is a series of pulses defined by a user-defined period with a 50% duty cycle. The Continuous Strobe Period
(t
CSPER
) has a resolution of 1 µs. The polarity is also selectable so that the Continuous Strobe signal period starts with either a 0 or 1.
The Continuous Strobe signal is only valid during the integration period (t
INTEG
). The Continuous Strobe period has a resolution of 1 µs
for a range of 0 to 65,535 µs. However, the Continuous Strobe signal is only exercised if it can complete a full period within the
integration period. If there are multiple Continuous Strobe periods within an integration period, only full periods are realized. This
means the time between the last Continuous Strobe period and the end of integration time is between 0 and t
CSPER
.
For the continuous Strobe signal to be fully realized for at least one period, the integration time must be greater than or equal to the
Continuous Strobe Period. See timing diagrams for more information of the Continuous Strobe Timing.
Summary of Contents for OCEAN SR2
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