I have a Rigol DS1000Z, and I'm using it to sort of log data. I have a wavelength tunable laser that creates an electrical pulse (start of pulse is start of sweep, end of pulse is end of sweep), and I have an optical power meter which measures the laser power, and gives an electrical signal.

I trigger the oscilloscope off the rising edge of the pulse, and I look at the power meter output in another oscilloscope channel. I can then see the power vs wavelength measurements on the scope. Although not a huge issue, I was wondering if it's possible to tell the scope to stop getting data on the falling edge of the pulse, instead of just filling up its memory.

Is this possible?

  • \$\begingroup\$ A lot of oscopes have a RUN/STOP button... Are you talking about something that would stop the real-time reading of the oscope? \$\endgroup\$
    – user103380
    Jul 4, 2017 at 16:30
  • \$\begingroup\$ @KingDuken Yes, I'd like the oscilloscope to stop its real-time reading when it detects a falling edge. \$\endgroup\$
    – user968243
    Jul 4, 2017 at 16:32
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    \$\begingroup\$ I suggest 'normal' or 'single' trigger setting, with an appropriate shift of the time reference. \$\endgroup\$ Jul 4, 2017 at 16:35
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    \$\begingroup\$ Can you clarify your Q, it sounds as if you would like to abort an acquisition cycle on the falling edge. I don't think a low end rigol will allow that \$\endgroup\$
    – sstobbe
    Jul 4, 2017 at 16:38
  • \$\begingroup\$ @sstobbe Yes, that's exactly what I'd like to do. Basically, I want the pulse to 'window' the data, otherwise I have to just do it myself on a computer. \$\endgroup\$
    – user968243
    Jul 4, 2017 at 16:40

1 Answer 1


If you can determine the time between the rise and fall of the pulse, then set the Trigger time Interval to 5% larger than the length of the pulse. The accuracy with which you set the Trigger Interval will determine how much additional data will be stored.

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    \$\begingroup\$ "Trigger Time Interval" is not a normal oscilloscope setting. You'll need to clarify this substantially if you want it to be positively received. \$\endgroup\$ Jul 8, 2017 at 4:34
  • \$\begingroup\$ Yup, you need the advanced trigger module to do this. \$\endgroup\$ Sep 8, 2017 at 18:15
  • \$\begingroup\$ This is incorrect. The issue has nothing to do with triggering, and everything to do with recording length. \$\endgroup\$ Nov 13, 2017 at 4:42

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