Trigger Setup for Ring-Down Test in Oscilloscope

[xiangyuwei]

Dear Moku Support Team,

I am currently working on a ring-down test using Moku, and I would like to ask for guidance on how to configure the trigger settings appropriately.

In my setup, I am driving a system with a sine wave, and I would like the oscilloscope to capture the waveform immediately before and after the driving signal is turned off, so that I can observe the ring-down behavior of the system.

The challenge I’m facing is that the sine wave is continuously oscillating, which makes it difficult to use a single falling edge trigger to reliably capture the moment when the signal stops. I’m looking for a way to trigger precisely when the sine wave is removed or suddenly drops to zero.

Could you please advise on how to configure the trigger in the Oscilloscope app to achieve this?

Thank you very much
Xiangyu

[hanklong]

Dear Xiangyu,

I think what you’re looking for is the single trigger feature on the oscilloscope.

Generally, you’d send an enable signal to the waveform generator to amplitude-modulate the sine wave. Then, configure the oscilloscope to trigger on the enable signal instead of the sine wave itself.

In my setup, the oscilloscope sends the enable signal to the waveform generator and simultaneously routes it to Channel B as the trigger source.

This is the result I obtained. Using single trigger mode, you can capture the signal both before and after the driving signal is turned off.

Is this what you had in mind?

Thank you very much.

Best regards,
Heyang

[xiangyuwei]

Yes, it works perfectly! Thank you very much for the help!