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      Set a line trigger
      • 12 Jan 2024
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      Set a line trigger

      • Updated on 12 Jan 2024
      • 1 Minute to read
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      Article Summary

      Internal line trigger

      The internal line trigger provides a continuous signal in the frequency of the exposure time.

      1. In the Configuration window navigate to Acquisition Control → Line Trigger.
      2. Below Internal select the Generate line trigger at frequency of line rate checkbox.

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      Alternatively, you can set the internal line trigger in the camera feature tree by executing the following step:

      StepFeature nameValue
      1Trigger SelectorLineStart
      Trigger ModeOff

      External line trigger

      The external line trigger can be provided by an encoder signal or a signal generator. Refer to Trigger Selector.

      1. In the Configuration window navigate to Acquisition Control → Line Trigger.
      2. Below External select the Generate line trigger from external encoder signal checkbox.
      1. In Encoder Source A and B select the desired input Line. Refer to electrical installation. 
      2. In Line Format select the electrical input signal. Refer to electrical installation.
      3. In Encoder Divider float input the number of encoder impulses to generate one LineStart signal. Refer to Encoder divider float.
      4. In Encoder Average input the number of averaged input signals.


      Alternatively, you can set the external line trigger in the camera feature tree by executing the following steps:

      StepFeature nameValue
      1TriggerSelectorLineStart
      TriggerModeOn
      2TriggerSourceEncoder0
      or Line1
      or Line3
      or Line4
      3EncoderSelectorEncoder0
      4EncoderSource ALine1
      5EncoderSource BLine2
      6EncoderDividerFloat0.05 – 255
      7EncoderAverage0-16
      8Digital I/O Line Selector select the Trigger Source 
      9Line Formatopen the drop-down menu and change the Line Format to your input signal

      Trigger Selector 

      Encoder0

      The Trigger Source → Encoder0 triggers the LineStart of the image acquisition. A certain number of encoder (Encoder divider float) impulses creates one LineStart signal. 

      svg-signal diagram-encoder 2 channel_03

      Line

      The Trigger Source → Line triggers the LineStart of the image acquisition. Each impulse generates one LineStart signal. 

      svg-signal diagram-wave_03

      Encoder divider float 

      An encoder typically does not have an integer ratio to the camera resolution. Arbitrary ratios of encoder pulses per sensor line are possible, for example, 2.25. The value range is 0.05 – 255 pulses per line.

      Example

      • Linear Stage with a tread pitch of 1 mm
      • Encoder with a resolution of 1000 Impulses per turnaround (I/U) → 1 Impuls per µm 
      • Optical lateral Camera resolution of 10 µm 

      Encoder divider float =  Optical resolution × encoder transport resolution = 10 µm × 1 I/µm = 10 I            Missing argument for \widehat   \widehat        Missing argument for \widehat  \widehat                  

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