Thank you so much for your answer, may I ask further how to vary the trigger length using the chip whisperer? The only parameter that seems making it change (and i think its confirmed by this image on cw api doc https://chipwhisperer.readthedocs.io/en/latest/_images/cwlitepro_glitch.png) is scope.glitch.repeat , but using low values such as 1 or 2 is not even sufficient to be perceived by the chipshouter as a real trigger signal.
There i am using repeat = 3 and it doesn’t trigger cs.
edit: is it okay that the chipShouter active low trigger to be pulled down is 70V high?