Patent ID: 7701193

Claim:
A pulse height analyzer for determination of pulse height distribution of electronic pulses, comprising: a set of comparators provided with a common input, for analog to digital conversion of the electronic pulses into converted pulses, a set of latches wherein inputs of the latches are connected to outputs of respective comparators for recording passage of corresponding threshold voltages by rising edges of the converted pulses, a priority encoder connected to outputs of the latches for determination of pulse height categories consisting of converted pulses with a pulse height within pulse height intervals defined by the corresponding threshold voltages, a micro controller that is adapted to count a number of pulses within each of the pulse height categories, and a current source for connection to electrodes contacting an electrolyte in two chambers mutually connected by an orifice for Coulter counting of particles, wherein the threshold voltages of the comparators are dependent on an actual value of generated electrode current, and whereby possible variations of the electrode current are substantially cancelled by corresponding variations of the voltage thresholds.