C400 - 4-Channel High-speed Pulse Discriminator and Counter

The C400 counts fast pulses generated by photomultipliers, avalanche photodiodes, and similar devices. It has four parallel channels that are configurable independent of each other. It provides high voltage bias for sensors and low voltage power for preamplifiers. Several units can measure in sync using a common trigger or encoder pulses.


  • Four independent channels with fast discriminators, scalers, preamp power and high voltage
  • 10 nsec pulse pair resolution
  • 150 MHz discriminator bandwidth
  • Trigger distribution facility for large detector arrays
  • Quadrature encoder input for data synchronization with goniometer
  • Test pulser output for each channel
  • Monitor output for each channel


  • Fast scintillator readout, NaI, LaCl3 , LaBr3 and YAP crystals
  • Avalanche photodiode readout
  • Detector array readout for area and position sensing detectors
  • Crystal diffraction experiments

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