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Triggering
A trigger or trigger event is an action that causes the Spectrometer to start an acquisition cycle. An acquisition cycle can be broken
up into 3 sections. The first is comprised of a delay, followed by an Integration period, and then lastly a busy time. A trigger event can
be a command from OceanView software, or a signal located on the auxiliary access connector.
There are several triggering modes for the spectrometer, and they have specific timing requirements. In addition, the single and
continuous strobe signal outputs are directly related to the triggering modes and their function. This document will describe and
define the overall function of the trigger modes and strobe signals.
Triggering Modes
The Ocean SR2 supports three triggering modes, which are set with the Trigger Mode command. Detailed information of each
triggering mode follows. Also, refer to the External Triggering Options document located on our website at
The 3 trigger modes are:
Software Triggering:
A trigger is initiated internal to the Spectrometer with a command from Ocean Insight approved software. The
integration period is set by software configuration.
External Edge Triggering
: A trigger is initiated by the rising edge of the external trigger signal on the auxiliary connector. The
integration period is set by software configuration.
External Level Triggering
: A trigger is initiated by the rising edge of the external trigger signal on the auxiliary connector. The
integration time is determined by how long the trigger pulse is held high.
Software Trigger
The default triggering mode is for a Software Trigger. A Software Trigger may be initiated by either OceanView, OmniDriver, or
OceanDirect software. Once a command is sent to the Spectrometer, an internal trigger is generated that begins an integration cycle.
A software trigger will initiate a single acquisition cycle with the spectral data made available after the integration period and a
specific busy time.
If a start time of T
0
is defined as the moment a software command is entered into OceanView software requesting an acquisition,
then there is a latency time of t
PROC
, which is the Software Command
Processing time
from T
0
to when the integration cycle starts.
This latency varies from computer system to computer system.
Summary of Contents for OCEAN SR2
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