Hello to everyone this is the first time I am writing. I would really appreciate your help. My issue goes like this:
I have a PMT signal from which I want to trigger an ICCD camera. The thing is that the pulses aren't proper to trigger the camera thus I want to discriminate them and then form the right square pulse to trigger the camera. What I use is an amplifier/discriminator and a gate/delay generator. I get the signal from the pmt and send it to the discriminator first. The thing is I want to monitor the light signal so I split it with a T connector and send it to both oscilloscope and discriminator. But then the signal I observe from the oscilloscope is attenuated. I don't understand why this happens. I suspect some impedance mismatch but I tried several things and I couldn't get my initial signal (without the discriminator connected). Even when the discriminator is turned off the signal will be attenuated. I am getting crazy here. How is this possible? Current leakage?? Can someone please explain to me what could be the issue? Thank you for any help and please dont judge me too much I am already getting all the stress I can handle
ps. Probably this happens because I split the current in two ways but why does this occur when I have the discriminator off. Is its impedance still present and draws the current?
I have a PMT signal from which I want to trigger an ICCD camera. The thing is that the pulses aren't proper to trigger the camera thus I want to discriminate them and then form the right square pulse to trigger the camera. What I use is an amplifier/discriminator and a gate/delay generator. I get the signal from the pmt and send it to the discriminator first. The thing is I want to monitor the light signal so I split it with a T connector and send it to both oscilloscope and discriminator. But then the signal I observe from the oscilloscope is attenuated. I don't understand why this happens. I suspect some impedance mismatch but I tried several things and I couldn't get my initial signal (without the discriminator connected). Even when the discriminator is turned off the signal will be attenuated. I am getting crazy here. How is this possible? Current leakage?? Can someone please explain to me what could be the issue? Thank you for any help and please dont judge me too much I am already getting all the stress I can handle
ps. Probably this happens because I split the current in two ways but why does this occur when I have the discriminator off. Is its impedance still present and draws the current?