I400 - 4 Channel Biased Input Charge Integrating Electrometer

The I400 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 unit may be stand-alone or networked with other devices and integrated into a larger system.

See the I404 for an electrometer with unbiased inputs suitable for detectors at ground potential.


  • Four parallel gated integrator channels
  • Programable bias voltage from 0V to +/-400V
  • Dynamic range < 0.1pA to >70µA
  • Low noise, < 100fA RMS +1fA RMS per pF input load
  • Stable output drift < 5ppm/C/Hour
  • Integrated digitization and communications
  • Integrated calibration test source
  • Multimode external triggering capability
  • Diagnostic host software with position algorithms and multiple display options


  • Ionization chamber readout
  • Secondary-electron beam position monitors
  • White beam blade BPMs
  • Photodiodes and photodiode beam position monitors
  • Diamond detector readout
  • General very-low current and charge measurement
HV emco

Integrated High Voltage

  • Avoids the need for a separate HV suppy
  • Precise programmable control of voltage
  • Choice of polarity and range up to positive or negative 1000 V
  • Short circuit protection and independent output voltage monitoring

Fiber-Optic Communications

Measurement data is transmitted through state-of-the-art fiber-optic cables. The benefits are numerous compared to other forms of data transmission.

  • Fiber-optics are immune to electrical interference
  • Minimal attenuation of light through fibers
  • Fast messaging over enormous distances
  • Radiation hard fiber materials

IG2 EPICS Support

Integrate device data collection and configuration into an EPICS system, without writing a single line of code using IG2.

  • Runs on Windows 7/8/10 and Debian Linux
  • Change PV names with simple XML configuration
  • Connect to multiple Pyramid devices at once
  • Add custom scale factors and offsets on a PV basis
  • Never have to recompile
  • Professional Pyramid support for bugs and features


Configurable EPICS channel access server for G2 and G1 devices

CM100 Render


Particle Therapy Control Console

MLFC-128 Render


Multi-Layer Faraday Collector for Particle Energy Measurement



Faraday Cup Beam Collector for Particle Therapy QA and Diagnostics

IC256-45 Render


256 Strip QC Ion Chamber

IC101 Render


Precision Electrometer Digital Current Integrator with High Voltage

I400 Render


4 Channel Biased Input Charge Integrating Electrometer

I404 Render


4 Channel Charge Integrating Digital Electrometer

I128 Render


128 Channel Charge Integrator Digital Electrometer