Hello
I had asked here I believe how the SDS2000X+ did well for triggering on a video pal signal and the answer was..... no.
What were your settings ?
I haven't yet been able to test on a noisy signal but on a clean signal, it trigs without problem on a line and it is rock stable
You can get a "noisy signal" from the built-in AWG. Just set the AWG to a low amplitude and use a 10X scope probe. For example set AWG to 10mvpp, and the input to the scope will be 1mvpp, or set the AWG to 8mvpp and the input will be 800uvpp.
On my DSO I need about 800uvpp for a reliable trigger with a 1MHz sinewave and a little more for the counter. Here's examples with a noisy 800uvpp signal and using the average function with 16 count to nicely "clean up" the waveform. One is sine wave and the other is a Chirp Waveform, the sine wave trigger is very steady, the Chirp is not as stable but still acceptable, both at 800uvpp.
Added another using the AWG SNR function, which is a sine wave with a PN noise pattern. The frequency was reduced to 1KHz because the "noise" is not random but periodic and at 1MHz this could easily be seen when averaging.
I think this is impressive for a DSO at this modest cost point
Best,
For this kind of chirp we can also try use, instead of rising edge and level threshold, example slope trigger (depending if signal is so that there is one detectable individual slope, as here example first rising slope) or just individual time interval inside one chirp what exist only once in one chirp.
Yes there is some learning curve before can reach level when can easy select and setup best trigger mode and parameters for different situations. We must learn out from "rising edge and level + holdoff time" thinking. I know, I have born analog scope in hand at 50's and it was nearly only way, if can not ext trig.
One example, still many of peoples may use edge- threshold + holdoff time when they trig for AM modulated signal. Because they are not familiar with lot of better methods. Yes it works whit quite narrow changes in modulating frequency but... in practice mostly signal are more complex that just simple fixed freg AM from signal generator. Same for this kind of signal in images.
As can see now there is visible some extra trig from other position in chirp. Just find unique detail inside one chirp and set trig trig to just it it. It can be example unique slope inside whole repetitive signal, like example in one chirp. In this example first falling slope. Or if think interval trig, last rising edge in end of chirp to first rising edge in start of chirp happen only once in period.
Adjusting these may first feel some frustrating but after short learning time ... and so on. Modern scopes can do lot of...