• Good time resolution over a wide range of pulse amplitudes with scintillation and semiconductor detectors
• 50-MHz count-rate capability
• 5 mV minimum threshold
• Time walk ≤100 ps for 100:1 dynamic range
• Constant-fraction, leading-edge, and slow-rise-time reject modes
The ORTEC Model 584 Constant-Fraction Discriminator allows good time resolution to be obtained from all commonly used detectors such as HPGe, silicon charged-particle, fast plastic, NaI(Tl), and photomultiplier tubes. Three timing modes are provided in the Model 584: constant-fraction, constant-fraction with slow-rise-time reject, and leading-edge. This economical unit has a minimum threshold of –5 mV, allowing good timing measurements to very low energies. The maximum input signal acceptable without saturation is –5 V,which provides a 1000:1 input dynamic range. The Model 584 is useful in high-count-rate applications to 50 MHz with ≤20 ns pulse-pair resolving time. The time walk of the Model 584 is ≤±100 ps for a 100:1 input dynamic range.