trigger help

[Erny]

I am trying to record times when waveform meets certain condition, =0 and dy/dt<0. The waveform consists of a sin wave with a gap in it 1/4 of the time which indicates the engine is at TDC.

With help i have a vi that produces a simulation to the wave i will eventually take from the crank sensor on the engine (attatched). I have produced a square wave from that wave which rises when the conditions above are met.

I have also been given a vi that records the peak times and time between teeth which is very close to what i want.

http://forums.ni.com/ni/board/message?board.id=170&message.id=139382  peak time recorder

What i need is to record these times when the conditons are met rather than the peak times.

[Erny]

Problem simply:

Is it possible to record the time when a boolean expression is true, i.e if an =0 condition was placed on an AC signal, would it be possible to record the times when the wave crossed 0.

[altenbach]

There seems to be a parallel thread about the same thing. Let's keep it all in one place and continue over there! 🙂