Add Unsurpassed Precision and Flexibility to Your Measurement System

Industry Leading Filters for the Most Demanding Measurement Applications

Optimize Sensor Performance in Extreme Environments

Collect Data You Can Trust With Built-In Performance Verification and Calibration

Real Time Cable and Sensor Health

The Global Leader in Signal Conditioning Technology


Precision Filters, Inc. (PFI) is a single-source electronics provider of analog signal conditioning and switching instrumentation designed for superior performance at a reasonable cost. We work closely with customers to ensure our products enable reliable, high-quality test measurements in the most demanding and critical applications.

Our Products

28000 Signal Conditioning System

  • Up to 256 channels per chassis
  • Mix bridge, strain, RTD, thermocouple, Kulite, piezoelectric, piezo-resistive, IEPE, and pulse rate sensors
  • PFI’s proprietary Balanced Constant Current (BCC) technology for dynamic strain conditioning
  • Best-in-class analog filtering
  • Built-in NIST Traceable calibration

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Stand-Alone Signal Conditioners

  • Space saving stand-alone products for benchtop or distributed signal conditioning
  • Anti-alias filters and conditioning for RTD, silicon diodes, IEPE, and 4-20 mA sensors
  • Integrated control and sensor-specific I/O
  • High-performance in an economical package

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Signal Conditioning for the NI C Series

  • PFI quality signal conditioning for the C Series platform
  • Anti-alias filters and conditioning for bridge, strain, charge, IEPE, and voltage
  • Compatible with all NI C-Rio and C-Daq chassis
  • Rugged compact platform operates from -40 to 70 °C

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High-Density Signal Switching Systems

  • Reliable solid-state programmable connections between any input and output
  • Up to 256x256 channels per system, scalable to larger channel counts with multiple systems
  • Intuitive spreadsheet-style GUI with color coding that simulates legacy patch panels
  • Program, save, and restore unlimited configurations
  • Built-in self-test and reporting

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