Guildline Instruments 6623A Series of High Current Range Extenders introduces new patented designs and the best in modularity of any Range Extender ever produced. The 6623A Series consists of a family of range extenders, with available current outputs from 3 ampere to 10,000 ampere.


  • Unique Guildline PATENTED Design
  • Dual Design – Extender and Precision DC Source
  • Design Includes Built-in Current Source with Electronic Polarity Switching
  • Automatic Load Balancing
  • NO External Power Supplies Required
  • NO Need for any Mechanical Reversing Switches and Compressed Gas
  • Advanced Modular Design, Over 64 Expandable Outputs in 150 A Increments to 10,000 Amperes, Investment Protection
  • Linearity: ± 0.01 ppm of Full Scale
  • Extended Low End Range Down to 0.1 µΩ
  • Output Current Stability Typically < 10 ppm for 1000A and Higher - Best in the World!
  • Programmed from 6622A Series Bridge
  • Unique USB Programmable Controller (model 66259) Allows 6623A to be Used as Stand-Alone Precision DC Current Source
  • Safety (Fault) Protections in Place
  • Complete Shunt Measurement Systems Available