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 0.1μΩ
  • Output Current Stability Typically < 10 ppm for 1000A and Higher!
  • Programmed from 6622A Series Bridge!
  • Unique USB Programmable Controller (model 66259) Allows 6623 to be Used as Stand-Alone Precision DC Current Source!
  • Safety (Fault) Protections in Place!
  • Complete Measurement Systems Available!