HPRS Series high power resistance decade box

The IET Labs high-power decade resistance substituter (HPRS) series is a family of resistance decade boxes offering a broad choice of high-power, excellent-performance resistance sources.

IET HPRS decade resistance substituter

The IET Labs HPRS Series resistance decade boxes employ state-of-the-art precision resistors of various types for high accuracy, high stability, and low temperature and power coefficients of- resistance. High-power resistors within the unit are made available without sacrificing other electrical properties.

The standard models offer a choice of 3 to 8 decades. The panels are clearly labeled showing the step size and maximum voltage and current limitations for each decade.


  • Resistance from 1mΩ to 10MΩ
  • Power rating: 225W / decade, 250W max. or higher (contact IET for custom higher power units)
  • Accuracy: 0.5% or 1%
  • Special and custom configurations available