I want to measure the signal from PMT . But it is a current signal, should i just put a series resistance, or use a amplifier to convert it to voltage signal before drs4?
Can you give me some advice ?
The evaluation board has a 50 Ohm termination resistor, which already converts your current into a voltage signal. If the resulting signal is too low (<20 mV) you can put in an amplifier or raise the HV of your PMT (inside the valid range given by its datasheet of course).