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Capturing Transient Response on DS1054z

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Mattjd:
Hi,

I'm working on a buck converter and am trying to do comparisons of simulation (with models of parts used) vs actual design. The Pspice simulation provided the following response



https://imgur.com/a/XfiV7jp

I've got the circuit breadboarded and am trying to obtain that response on my DS1054z. I currently have the vertical divisions set to 5 volts and horizontal divisions set to 1ms. I've been reading through the trigger options of the manual but I am not having any luck obtaining the response. I was going through them and looking for which (if any) would trigger and hold after 5ms of waveform is captured. Does anyone have any suggestions?

rstofer:
Nothing attached...

I would think you would want to trigger on some event or edge (rising or falling) and use Single Mode to get just one sweep.  If you want 5 ms across 12 units, you probably want to see the time/div to 500 us.  You will get 6 ms and that's probably close enough.

You would also want to move the trigger horizontal point over to the left edge of the screen with the horizontal Position knob (right about time/division knob).

Mattjd:

--- Quote from: rstofer on April 18, 2019, 11:51:48 pm ---Nothing attached...

I would think you would want to trigger on some event or edge (rising or falling) and use Single Mode to get just one sweep.  If you want 5 ms across 12 units, you probably want to see the time/div to 500 us.  You will get 6 ms and that's probably close enough.

You would also want to move the trigger horizontal point over to the left edge of the screen with the horizontal Position knob (right about time/division knob).

--- End quote ---

Do you see the imgur now?

Mattjd:
Do you think timeout on the positive edge is the positive trigger?

https://www.batronix.com/pdf/Rigol/UserGuide/DS1000Z_UserGuide_EN.pdf

Pg 5-24

Right now I have 500us per division with the position all the way to the left. I have the trigger at 500mV utilizing the Timeout trigger to start counting when the positive edge crosses 500mV and go off after 5ms. It keeps holding at steady state. It triggers at steady state and I dont get to see the transients.

alsetalokin4017:
Your vertical divisions are set to 5V/div? And your maximum voltage on the simulation is a hair less than 4.8 V ? So you are trying to see the whole transient within a single vertical division?

Maybe that's the problem.

Set the volts per division to 1V/div, use single shot mode, set trigger vertically to slightly below peak  expected voltage, do not set trigger all the way to the left yet. Let's get the peak captured, then we can change some settings to get a display similar to the Spice readout.  Just use the normal edge trigger with default holdoff for now. Single shot, rising edge trigger, 1v/div vertically, 500 us horizontally.

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