Triggering
Basis:
Trigger: device which activates or deactivates a timer when the graph of a waveform crosses a certain threshold.
First Trigger: activated by the initial pulse
Second trigger: activated by one of many pulses which occur following the first pulse.
Holdoff Period: length of time after the first threshold is crossed before the second trigger begins looking for thesecond threshold
Justification:
Second trigger needs to “holdoff” for a period because the initial pulse will trigger it immediately.
Because various objects reflect pulses, discretion must be used when establishing a holdoff period.
Time between pulses can be equated to distance between objects