Pulsewidth

pulsewidth trigger diagrams, analogue and TTL

The pulsewidth could be used in combination with several other trigger modes. This value defines the width of a pulse that must be reached or must not be reached for trigger detection. Very useful in applications where the trigger is in relation to and analogue signal and embedded in noisy signals. Conversely TTL signal triggers are normally injected via the boards dedicated trigger input connector.

  MI boards PCI.248/258  
Pulse > Pw x x After crossing the defined trigger level, a trigger will occur at the end of the programmed pulsewidth. Further crossings of the trigger level within the programmed pulsewidth are ignored. This may be used to avoid multiple triggers on noisy signals.
Pulse < Pw x - The signal must cross the trigger level a second time in the programmed pulsewidth. Could be used to trigger on glitches and spikes.
TTL > Pw x x A TTL pulse on the external trigger connector that is longer than the programmed pulsewidth.
TTL < Pw x - A TTL pulse on the external trigger connector that is shorter than the programmed pulsewidth.