EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Shaw on July 08, 2013, 12:21:03 pm
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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 :)
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There is a holdoff option in the trigger setup that you can make larger that might help.
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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.
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"trigger hold-off eevblog" - perfect!
Thanks for the tip.
Half the battle is knowing just the right keywords to use :)