Maybe just some insight on how trigger-point interpolation behavior is implemented on the Magnova, what we expect you to see and ways to influence the general trigger result, if the interpolated „actual“ waveform shall not be the desired reference for triggering:
As specified in the datasheet, the maximum (Sinc) interpolated sampling rate inside the Magnova processing system is 512 GSa/s at 1.0 GSa/s ADC sampling rate and 819.2 GSa/s at 1.6 GSa/s ADC sampling rate, respectively. This on the one hand defines the temporal resolution of the determination of the actual trigger point. On the other hand the interpolation method itself already implies, that calculation of the trigger point is based on not only two succeeding points but a whole series of samples to achieve a proper interpolation/signal reconstruction behavior. The observed „trigger lens“ corresponds to a precisely matched overlay of thousands of waveforms based on a specific trigger level. We decided, that this is the behavior, we would like to provide: Highest precision triggering allowing to trigger even on slightest signal changes (which also holds for noise). This temporal precision is still visible at up to 200 ps/div (via Zoom feature or general waveform display). A „distributed“ trigger point was not intended. You might intentionally „worsen“ the displayed (not the acquired) result by switching to linear interpolation in the Display menu, which might at some point lead to a seemingly less precise match of waveform trigger positions (with all further consequences).
Some manufacturers provide(d) dedicated bandwidth filters for their trigger paths. We (and seemingly other manufacturers) decided that configurable trigger hysteresis, versatile trigger types (e.g. slope) and additional optional and configurable low-pass and HiRes filter stages preceding the trigger system should suit most requirements when influence of noise on triggering must be further reduced.
The Magnova has a trigger rate of currently up to > 14M wfms/s (simply start history mode at corresponding time scales with proper input signal and press Run) with precise determination of the trigger point taking place for all acquired waveforms. Only a very limited number of trigger types remains as an exception (based on their general concept) meaning the positions of corresponding trigger events always match sample positions / are never interpolated.
Best regards,
Florian