Auto stop at Nth continuous square cycles whose amplitude exceeds a threshold

HI all,

I am getting high freq Sqaure waveforms into my DAQ card.  The waveform starts at low amplitude but will undergo a jump that are of concern,  I'd like to stop running LabView automatically when it's detected that there are N continuous square cycles whose amplitude exceeds a threshold y.  I use a DAQ card having 2 counters, and frequency is within its limit.

Any help would be highly apprecciated. Thank you.

-Ian