Hardware Trigger (chipshouter)

Hi, I’m trying to use the hardware trigger in CS, but it’s not working well. Using an external pulse generator, the pulse width was varied from 200ps to 1ns at a voltage of 3.5V to 5V as the input of the hardware trigger. I connected the 20:1 monitoring port and checked it with an oscilloscope, but I couldn’t see the pulse being generated. The CS settings are as follows. Please let me know if I’ve missed anything.