Correct method for triggering on Rigol 1102e

[Shaw]

Hi,  I just bough a Rigol 1102e scope and have been experimenting capturing traces off every piece of electronics I can get my hands on.  One thing which has puzzled me is with my radio control transmitter which has a digital PPM output into the actual transmitter module.  Basically it sends a short burst of 10 pulses at +5v followed by a 0v "gap" and another burst of 10 pulses.  (it's a Hitec Aurora 9 for those who are interested)

My problem is how to get the scope to trigger on the first low->high edge of each block rather than randomly on some low->high edge.  I am trying to get it so that I can see an entire block of the 10 channel PPM encoded transmission on the screen at the same time so that I can see what happens when I change the positions of the sticks on my controller.

I've tried searching on google but I haven't had much luck, probably just due to lack of the right search terms.

Thanks in advance

[alank2]

There is a holdoff option in the trigger setup that you can make larger that might help.

[alm]

Search for trigger hold-off. Should work fine assuming the length of the burst of 10 pulses is constant. I think Dave even did a video tutorial on trigger hold-off.

[Shaw]

"trigger hold-off eevblog" - perfect! 

Thanks for the tip.

Half the battle is knowing just the right keywords to use