Ocean Optics Flame-S, User Manual

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6: Technical Specifications
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The Trigger Delay (TD) is another user programmable delay which specifies the time in 500ns
increments that the SOI will be delayed beyond the normal Start of Integration Delay (SOID).
An example calculation of the Single Strobe timing follows:
If the TD = 1ms, SSHTD = 50ms, and SSLTD = 70ms then, the rising edge of the Single Strobe
will occur approximately 51.82ms (1ms + 50ms + 8.2us) after the External Trigger Input goes
high and the Pulse Width will be 20ms (70ms – 50ms).
Continuous Strobe
The Continuous Strobe signal is a programmable frequency pulse-train with a 50% duty cycle.
It is programmed by specifying the desired period whose range is 2us to 60s. This signal is
continuous once enabled, but is not synchronized to the Start of Integration or External Trigger
Input. The Continuous Strobe is only active if the Lamp Enable command is active.
Synchronous Continuous Strobe
In Synchronous mode, the strobe will always be the same integer number of pulses per
integration period, and deterministic from the start of integration. Setting the strobe period to
greater than the ((integration time/2)-strobe offset) will result in nonguaranteed behavior
(there is no time to do a single pulse).
If the application requires more than one pulse per integration period, ensure the continuous
strobe and integration period are synchronized. The integration time must be set so that an
equal number of strobe events occurs during any given integration period.
External Triggering
The Flame Spectrometer has several ways of acquiring data. In the Normal/Free-Run mode, the
spectrometer is “free running.” That is, the spectrometer is continuously scanning, acquiring,
and transferring data to your computer, according to parameters set in the software. In this
mode, there is no way to synchronize the scanning, acquisition, and transfer of data with an
external event. However, trigger pulses for synchronizing an external event with the
spectrometer are available.
Each trigger mode involves connecting an external triggering device to the spectrometer and
then applying an external trigger to the spectrometer before the software receives the data.
The length of the integration time and the source for the integration clock depend upon the
mode chosen. All other acquisition parameters are set in the software.
You can trigger the Flame using a variety of External Triggering options through the 40-pin
Accessory Connector on the spectrometer. See the External Triggering Options document
located at http://oceanoptics.com/wp-content/uploads/External-Triggering-
Options_Firmware3.0andAbove.pdf. The triggering document contains further instructions for
configuring External Triggering options for the Flame.