I have been using a PMT to detect pulses of light, and logic pulses were involved, but I'm not quite clear how they work. Essentially the PMT was connected to a counter and discriminator, and it was possible on the discriminator to change the width of the pulse and the threshold voltage. I understand that the threshold voltage filters out pulses below a certain amplitude.
I'm not sure how the logic pulse works and I'm obviously not googling the right thing, because I can't find any info on them. It's somehow related to how many times a pulse is counted. But I'm not sure whether a wider pulse would cause more or less triggers, and I no longer have access to the equipment so I can't simply check. If anyone can work out what I'm describing and point me in the direction of resources that explain it, that would be much appreciated.
I have a feeling that while logic pulse was the term I was told to use, it may be the wrong one. I found an incredibly short reference to something called a 'gating pulse' which sounds like what I had, but I can't find info on that on google either.