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input/output trigger question

Timon chen
Prodigy 130 points

Hi,

I have some question about trigger design.

First, I wonder the relationship between AutoTriggerPeriod and ExposuteTime.

In the sample code, the AutoTriggerPeriod is defined 8333, and ExposuteTime is defined 8842.

Why the ExposureTime is larger than AutoTriggerPeriod? How can I define this two value are suitable?

 

Second, I need to  know what is the relationship between input and output trigger.

If I set an output trigger using LCR_CMD_SetCamTriggerSetting(&triggerSet)

Will this command trigger is Synchronous with input trigger(auto trigger) or I need other settings?

Please refer to this picture.If I define "input trigger period = output trigger pulse width", are they triggering at the same time?

  • 0
    Prodigy 130 points

    I post on the wrong place. I'm using LightCrafter development.

  • 0 in reply to Timon chen
    TI__Mastermind 30875 points

    Hi Timon,

    Sorry it was a typo in the sample code, the AutoTriggerPeriod always >= ExposureTime. In sample code these two names appears to be interchanged. AutoTriggerPriod = 8842us and ExposureTime = 8333us. The system allows selecting exposure-time upto 20000us and higher in multiple of 2 like 40000us, 60000us, etc...

    The output trigger is always synchronized to the input trigger. You don't need to make additional settings after calling SetCamTriggerSettings, you can refer to the sample-code for the sequence of calls. 

    The signal timing is shown by you is incorrect, the output trigger matches to the pattern exposure timing. It will appear at the beginning of the Exposure-Time, in this case the output trigger pulse appears after 'Trigger Delay' matching the beginning of Exposure time. 

    Regards,

    Sanjeev

  • 0 in reply to Sanjeev
    Prodigy 130 points

    Hi Sanjeev,

    That seem true.

    But what below parameter means? Are those using in other trigger mode?

    LCR_CamTriggerSetting_t triggerSet

    triggerSet.Enable  

    triggerSet.PulseWidth  

    triggerSet.Delay  

    triggerSet.Polarity (this seem to set the inverse pulse) 

    LCR_CMD_SetCamTriggerSetting(&triggerSet);