SETTING ADVANCED OPTIONS
Some adjustments will be found in the Advanced Options dialog (under File… Advanced Options), in the Fulcrum tab.
• Default output state: this controls the level of the output trigger signal in between triggers; high is TTL high, low is
TTL low.
• Low time: when a trigger event occurs, this is the amount of time the output signal goes low before the pulse will
be sent. If the default state is low, this will simply induce an additional delay.
• High time: when a trigger event occurs, the amount of time the output signal will stay high, after going low.
Normally, the output state will be set low; the low time set to 0; and the high time set long enough to cause the
cameras to trigger (20us generally works).
For strobe applications, we can set the default state to high, and set a non-zero low time. If we set the camera to
trigger on the falling edge of the output signal, and the strobe to trigger on the rising edge, we can introduce a
delay so that the camera starts exposing before the strobe fires. This delay will be equal to the low time.
• Minimum frequency: set this to the lowest frequency you expect to measure. Setting this very low will increase the
timeout values for the frequency and peak measuring functions, which can reduce responsiveness. For example, if
this is set to 0.2Hz, the frequency function will wait a full 5 seconds before timing out and trying again.
• Maximum frequency: setting this frequency can guard against accidental triggering due to noise and lost signal. If
the software measures a frequency higher than this, it will consider the signal lost. This also prevents accidentally
counting erroneous cycles which can cause a false high cycle count.
• Maximum trigger rate: set this to something slightly less than the maximum frame rate of your cameras. This is
important in order to avoid missed triggers.
• Always show waveform: if this is checked, the waveform display is updated every cycle. In this mode, the cameras
will be triggered at most 1 cycle in every 4. With this option cleared, the waveform will only be updated when the
signal is first locked; in this mode, the cameras can be triggered at most 1 cycle in every 2 (at lower frequencies).
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