Thursday, September 1, 2022

A1427 KIT Low Noise Fast Current Preamplifier & Discriminator

The CAEN A1427 is a fast and low noise current preamplifier with AC coupled input. It hosts two outputs: EOUT (unipolar) that can be integrated to calculate the energy associated to the input signal and FOUT (bipolar) that can be used to calculate the rate of the input signal, discriminating the negative pole using the A1428 discriminator that is specifically designed to fit with A1427. The discriminator thresholds are settable from -1 to -100 mV via a 10-turn rotary handle with lock.

A1427 Kit configuration is also available. It includes the A1427 and the A1428 assembled together, both  for fission chambers and for proton recoil detectors.


  • Fast non-inverting preamplifier, negative output (EOUT)
  • Input impedance: 50 Ω AC coupled
  • Output high impedance (EOUT)
  • Bipolar output high impedance (FOUT)
  • Test input (TEST IN) impedance: 50 Ω, negative polarity
  • FOUT/DET IN gain (FOUT negative lobe):
  • FC version: 700÷2500
  • PR version: 500÷1500
  • FOUT/TEST IN gain: 1/100 of DET IN gain
  • Output noise (peak to peak) < 40 mV
  • Up to 3 kV detector bias voltage (HV IN)
  • Rbias: 200 kΩ

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