The CAEN Mod.A1428 is a leading-edge discriminator designed for negative pulses, with thresholds values into the range from -1 mV to -100 mV. It’s suited to work with A1427, a fast and low noise current preamplifier with AC coupled input which hosts two outputs to calculate the energy associated to the input signal and the rate.
A1427 Kit configuration is also available, that includes the A1427 and the A1428 assembled together, both for fission chambers and for proton recoil detectors.