I have a PWM signal that I am probing but I have problems getting it to trigger on pulse width triggering. I set it to positive pulse and outside time range and set a time that is less than the size of the duty cycle, but it will not trigger. The only time it will trigger is if I set the time to 0 but if I set to to the next smallest interval 2ns, then it won't trigger anymore.
What is the proper procedure to get it to trigger on pulses larger than a certain size?