# Strobe and Trigger

Use the Strobe and Trigger tab to control an optional strobe light as well as to configure the type of trigger this acquisition channel uses to signal that an image acquisition should begin. The fields in this tab vary depending on the specific frame grabber you use. The following figure shows an example Strobe and Trigger tab:

Configure the following settings:

Setting | Description
--- | ---
Strobe Enabled | Enables the strobe light for each image acquisition. With a strobe light enabled, configure the following settings: The Pulse Duration field sets the duration of the pulse, in milliseconds. The Delay field sets the delay time between the shutter pulse and the firing of the strobe. The Pulse Polarity High checkbox sets the strobe pulse polarity to high. Refer to your strobe hardware documentation for the correct setting.
Trigger Model | Choose one of the following incoming trigger type for this acqFIFO: Manual triggers acquire an image when you press Run. Free Run triggering allows the acquisition system to acquire images at the highest frame rate that the acquisition module can support. Hardware Auto triggers start an image acquisition when the application detects a transition on an external trigger line. Check the Trigger Low To High checkbox if the trigger signal is a transition from low to high. Hardware Semi-Auto triggers acquire an image when you press Run and the application detects a transition on an external trigger line. Check the Trigger Low To High checkbox if the trigger signal is a transition from low to high.
Min Trigger Width | Sets the minimum trigger width in milliseconds. The trigger input signal must be asserted for at least this amount of time before it is recognized as a valid input trigger. QuickBuild ignores any trigger signal that does not meet this width constraint.
Min Trigger Period | Sets the minimum time between triggers in milliseconds. Only the first valid trigger within a period will initiate a camera integration cycle. Other valid triggers in that same period are missed. You can use this value to help limit the camera acquisition rate Legal values range from 0 to 65.5. A value of 0 specifies that there is no period requirement.
Trigger Delay | Sets the period of time, in milliseconds, between the receipt of the acquisition trigger and the start of camera integration.