FX4 - High-speed Quad-channel Precision Electrometer

The FX4 is a sophisticated 100 kHz, 4-channel electrometer, designed to accommodate nanoamp to milliamp currents, making it an ideal choice for precise and reliable measurements in conjunction with quadrant or segmented detectors. Equipped with an integrated high-voltage source, the FX4 facilitates compatibility with ionization chamber, low-voltage bias applications, and electron suppression rings, ensuring versatility in various experimental setups.

One of the key strengths of the FX4 is its ability to function as four separate electrometer channels, providing users with the flexibility to customize the device for their specific requirements. This adaptability optimizes both efficiency and accuracy, resulting in enhanced performance across diverse applications.

In addition, the FX4 boasts an extensive dynamic range, enabling the measurement of low currents from devices such as the BC-75 Faraday collector. This comprehensive range ensures the FX4's applicability in various fields, including Flash therapy and ultra-high dose rate measurements.


  • Dynamic ranges from 0.02nA to 10mA
  • 100kHz simultaneous digitization
  • High voltage detector bias options up to +/-2000V
  • Ethernet interface with web GUI and HTTP/WebSocket API
  • Built-in EPICS server
  • Charge accumulation and dose control
  • External digital trigger capability
  • 4 general purpose analog outputs
  • 4 bidirectional digital I/O
  • 6 general purpose fiber optic pairs
  • 2 solid state relays with safety watchdogs
  • 8 selectable measurement ranges and bandwidths


  • Quadrant ionization chamber readout
  • Quadrant photodiode and diamond readout
  • Dose delivery control
  • Beam stabilization

Modern Software Package

  • Rely on the QNX real-time OS for exceptional performance and stability.
  • Dependable data collection and control with JSON HTTP/WebSocket API.
  • Comprehensive input/output through the robust, embedded EPICS server.
  • Advanced web GUI for real-time data visualization and configuration.
  • Enables flexible scripting and integration for a variety of programming languages.
PX1 Closeup


Flash therapy stands as a breakthrough in radiation therapy. Our commitment centers on delivering researcher-focused, state-of-the-art Flash therapy instruments, prioritizing accessibility and promoting collaboration within the industry.

For expert guidance and partnership opportunities in upcoming radiation therapy endeavors, engage with our dedicated engineering and sales team team today.

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