The 6634A Series is a modular set of up to ten 4-Terminal Resistance Standards that can be rack or bench mounted. The 6634A Series provides a set of customer chosen precision resistance standards enclosed in a temperature controlled chamber.


  • Resistance Range: 0.1 Ω to 100 MΩ in Single Decade Increments or Special Values
  • Stabilities Low as < 2 ppm/year
  • Temperature Coefficient ± 0.005 ppm/°Cand Internal PRT Stability: ± 0.02 °C / Year
  • Temperature Regulation: ± 0.01 °C Over a 1 Year Period
  • Low Thermal EMF’s – Shielded and Guarded Chamber
  • ISO/IEC 17025 DC Calibration Included
  • CE Marked With World-Wide Voltage & Frequencies