Same signal 10ms vs 10 s

I need some help understanding why/what I am seeing. Both of these waves are the exact same signal (Transmission secondary solenoid control, Jeep Compass). Same engine running cycle. All I did was change the time base on the scope. The first wave is a 10 ms screen. No surprises, here. But, when I slowed down to a 10 second screen, I was surprised to see, what seems like, a slower frequency. 8 cycles in 10 ms VS. 3 cycles in 10 seconds?!:blink: :huh: I was expecting to see a fat yellow bar.

That is really weird

That's what I thought. I'm sure there is an explanation/reason. I'm trying to tell myself it has something to do with sampling, but I, really, don't get it.

I see you've got filtering on channel one? :huh: I betcha that's why. The sampling rate is pretty low at 10s, and then you add filtering on top. You probably would have seen the big fat yellow blur across the screen that you were expecting with filtering off.

I brought this one back in to play around. This is the same circuit on a 10 second screen with no filter. The turn on and turn off look more straight up and down. Turn the filter back on and the slight slope returns. I, now, believe the 10 second screen is giving me a REPRESENTATION of Duty Cycle. The first set was KOER. The second set is KOEO.

The "Fat Yellow Bar" seems to stop at the 2 second screen. The "represented Duty Cycle" starts on the 5 second screen.

Nice follow-up. Definitely shows how scope setup can change what you're seeing.

Side note: If I have one complaint about the Modis Ultra/Vantage Ultra, it's the save/zoom time. Either one on any timebase 200ms or below is HORRIBLE.