I404 - 4 Channel Charge Integrating Digital Electrometer

The I404 is intended for the measurement of small charges or corresponding currents (from pA to µA) generated by devices such as ionization chambers, in-vacuum beam position monitors, proportional chambers, and photodiodes. Four input channels make the I404 particularly well-suited to four-quadrant electrode systems used for beam centering. The I404 includes an integrated high-voltage supply, suitable for biassing detectors.

See the I400 for an electrometer offering high voltage biased inputs, suitable for thimble ionization chambers.

See the IC101 for an electrometer with a single channel.


  • Four integrator channels with common gate
  • Dynamic range <1 pA to 200 µA
  • Integrated digitization and filtering
  • Fiber-optic, RS-232, and RS-485 interfaces
  • Integrated calibration current test source
  • Full control provided of integration modes
  • External trigger capability
  • Four independent analog monitor outputs configurable to show current or position
  • Four independent frequency monitor outputs (VFC)
  • Optional high voltage output
  • On-board calculation of position function in real time


  • Quadrant photodiode readout
  • Low current and charge measurement
  • Beam position monitors

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